1.17+ Support / Java Settings by Instance (#261)

* Patches to get 1.17 working, need to revise into real solutions. * Add version.jar to cp until 1.17. * Add server selection button to Java settings tab in preparation for by-instance java settings. * Java settings by instance * Use classpath flag instead of hardcode. * Support 1.19. * Fix refresh of java exec details. * Add doc. * Fix auto download of jdk 17. * Dependency upgrade.
2024-12-21 19:22:13 -08:00 · 2022-11-27 18:13:50 -05:00 · 2022-11-27 18:13:50 -05:00 · e3ee03ef73
commit e3ee03ef73
parent 190bb4cf85
13 changed files with 579 additions and 283 deletions
--- a/.eslintrc.json
+++ b/.eslintrc.json
@ -5,7 +5,7 @@
    },
    "extends": "eslint:recommended",
    "parserOptions": {
-        "ecmaVersion": 2019,
+        "ecmaVersion": 2021,
        "sourceType": "module"
    },
    "rules": {
--- a/app/assets/css/launcher.css
+++ b/app/assets/css/launcher.css
@ -1228,6 +1228,59 @@ body, button {
    font-size: 12px;
 }

+/* Selected server content container */
+.settingsSelServContainer {
+    background: rgba(0, 0, 0, 0.25);
+    width: 75%;
+    border-radius: 3px;
+    display: flex;
+    justify-content: space-between;
+    margin: 15px 0px;
+}
+
+/* Div which will be populated with the selected server's information. */
+.settingsSelServContent {
+    display: flex;
+    align-items: center;
+    justify-content: flex-start;
+    padding: 5px 0px;
+}
+
+/* Wrapper container for the switch server button. */
+.settingsSwitchServerContainer {
+    display: flex;
+    align-items: center;
+    padding: 15px;
+}
+
+/* Button to switch server configurations on the mods tab. */
+.settingsSwitchServerButton {
+    opacity: 0;
+    border: 1px solid rgb(255, 255, 255);
+    color: rgb(255, 255, 255);
+    background: none;
+    font-size: 12px;
+    border-radius: 3px;
+    font-family: 'Avenir Medium';
+    transition: 0.25s ease;
+    cursor: pointer;
+    outline: none;
+}
+.settingsSwitchServerButton:hover,
+.settingsSwitchServerButton:focus {
+    box-shadow: 0px 0px 20px rgb(255, 255, 255);
+    background: rgba(255, 255, 255, 0.25);
+}
+.settingsSwitchServerButton:active {
+    box-shadow: 0px 0px 20px rgb(187, 187, 187);
+    background: rgba(187, 187, 187, 0.25);
+    border: 1px solid rgb(187, 187, 187);
+    color: rgb(187, 187, 187);
+}
+.settingsSelServContainer:hover .settingsSwitchServerButton {
+    opacity: 1;
+}
+
 /* Remove spin button from number inputs. */
 #settingsContainer input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
@ -1638,59 +1691,6 @@ input:checked + .toggleSwitchSlider:before {
 * Settings View (Mods Tab)
 * * */

-/* Selected server content container */
-#settingsSelServContainer {
-    background: rgba(0, 0, 0, 0.25);
-    width: 75%;
-    border-radius: 3px;
-    display: flex;
-    justify-content: space-between;
-    margin: 15px 0px;
-}
-
-/* Div which will be populated with the selected server's information. */
-#settingsSelServContent {
-    display: flex;
-    align-items: center;
-    justify-content: flex-start;
-    padding: 5px 0px;
-}
-
-/* Wrapper container for the switch server button. */
-#settingsSwitchServerContainer {
-    display: flex;
-    align-items: center;
-    padding: 15px;
-}
-
-/* Button to switch server configurations on the mods tab. */
-#settingsSwitchServerButton {
-    opacity: 0;
-    border: 1px solid rgb(255, 255, 255);
-    color: rgb(255, 255, 255);
-    background: none;
-    font-size: 12px;
-    border-radius: 3px;
-    font-family: 'Avenir Medium';
-    transition: 0.25s ease;
-    cursor: pointer;
-    outline: none;
-}
-#settingsSwitchServerButton:hover,
-#settingsSwitchServerButton:focus {
-    box-shadow: 0px 0px 20px rgb(255, 255, 255);
-    background: rgba(255, 255, 255, 0.25);
-}
-#settingsSwitchServerButton:active {
-    box-shadow: 0px 0px 20px rgb(187, 187, 187);
-    background: rgba(187, 187, 187, 0.25);
-    border: 1px solid rgb(187, 187, 187);
-    color: rgb(187, 187, 187);
-}
-#settingsSelServContainer:hover #settingsSwitchServerButton {
-    opacity: 1;
-}
-
 /* Main content container for the mod elements. */
 #settingsModsContainer {
    width: 75%;
--- a/app/assets/js/assetguard.js
+++ b/app/assets/js/assetguard.js
@ -5,6 +5,7 @@ const child_process = require('child_process')
 const crypto        = require('crypto')
 const EventEmitter  = require('events')
 const fs            = require('fs-extra')
+const nodeDiskInfo  = require('node-disk-info')
 const StreamZip     = require('node-stream-zip')
 const path          = require('path')
 const Registry      = require('winreg')
@ -342,6 +343,9 @@ class JavaGuard extends EventEmitter {
     * @returns {boolean} True if the path points to a Java executable, otherwise false.
     */
    static isJavaExecPath(pth){
+        if(pth == null) {
+            return false
+        }
        if(process.platform === 'win32'){
            return pth.endsWith(path.join('bin', 'javaw.exe'))
        } else if(process.platform === 'darwin'){
@ -459,25 +463,30 @@ class JavaGuard extends EventEmitter {
                let verString = props[i].split('=')[1].trim()
                console.log(props[i].trim())
                const verOb = JavaGuard.parseJavaRuntimeVersion(verString)
+                // TODO implement a support matrix eventually. Right now this is good enough
+                // 1.7-1.16 = Java 8
+                // 1.17+ = Java 17
+                // Actual support may vary, but we're going with this rule for simplicity.
                if(verOb.major < 9){
                    // Java 8
-                    if(verOb.major === 8 && verOb.update > 52){
+                    if(!Util.mcVersionAtLeast('1.17', this.mcVersion)){
+                        if(verOb.major === 8 && verOb.update > 52){
+                            meta.version = verOb
+                            ++checksum
+                            if(checksum === goal){
+                                break
+                            }
+                        }
+                    }
+                } else if(verOb.major >= 17) {
+                    // Java 9+
+                    if(Util.mcVersionAtLeast('1.17', this.mcVersion)){
                        meta.version = verOb
                        ++checksum
                        if(checksum === goal){
                            break
                        }
                    }
-                } else {
-                    // Java 9+
-                    if(Util.mcVersionAtLeast('1.13', this.mcVersion)){
-                        console.log('Java 9+ not yet tested.')
-                        /* meta.version = verOb
-                        ++checksum
-                        if(checksum === goal){
-                            break
-                        } */
-                    }
                }
                // Space included so we get only the vendor.
            } else if(props[i].lastIndexOf('java.vendor ') > -1) {
@ -804,13 +813,20 @@ class JavaGuard extends EventEmitter {
        // Get possible paths from the registry.
        let pathSet1 = await JavaGuard._scanRegistry()
        if(pathSet1.size === 0){
+
            // Do a manual file system scan of program files.
-            pathSet1 = new Set([
-                ...pathSet1,
-                ...(await JavaGuard._scanFileSystem('C:\\Program Files\\Java')),
-                ...(await JavaGuard._scanFileSystem('C:\\Program Files\\Eclipse Foundation')),
-                ...(await JavaGuard._scanFileSystem('C:\\Program Files\\AdoptOpenJDK'))
-            ])
+            // Check all drives
+            const driveMounts = nodeDiskInfo.getDiskInfoSync().map(({ mounted }) => mounted)
+            for(const mount of driveMounts) {
+                pathSet1 = new Set([
+                    ...pathSet1,
+                    ...(await JavaGuard._scanFileSystem(`${mount}\\Program Files\\Java`)),
+                    ...(await JavaGuard._scanFileSystem(`${mount}\\Program Files\\Eclipse Adoptium`)),
+                    ...(await JavaGuard._scanFileSystem(`${mount}\\Program Files\\Eclipse Foundation`)),
+                    ...(await JavaGuard._scanFileSystem(`${mount}\\Program Files\\AdoptOpenJDK`))
+                ])
+            }
+            
        }

        // Get possible paths from the data directory.
@ -1542,9 +1558,10 @@ class AssetGuard extends EventEmitter {
    // Java (Category=''') Validation (download) Functions
    // #region

-    _enqueueOpenJDK(dataDir){
+    _enqueueOpenJDK(dataDir, mcVersion){
        return new Promise((resolve, reject) => {
-            JavaGuard._latestOpenJDK('8').then(verData => {
+            const major = Util.mcVersionAtLeast('1.17', mcVersion) ? '17' : '8'
+            JavaGuard._latestOpenJDK(major).then(verData => {
                if(verData != null){

                    dataDir = path.join(dataDir, 'runtime', 'x64')
--- a/app/assets/js/configmanager.js
+++ b/app/assets/js/configmanager.js
@ -63,6 +63,27 @@ function resolveMinRAM(){
    return resolveMaxRAM()
 }

+/**
+ * TODO Copy pasted, should be in a utility file.
+ * 
+ * Returns true if the actual version is greater than
+ * or equal to the desired version.
+ * 
+ * @param {string} desired The desired version.
+ * @param {string} actual The actual version.
+ */
+function mcVersionAtLeast(desired, actual){
+    const des = desired.split('.')
+    const act = actual.split('.')
+
+    for(let i=0; i<des.length; i++){
+        if(!(parseInt(act[i]) >= parseInt(des[i]))){
+            return false
+        }
+    }
+    return true
+}
+
 /**
 * Three types of values:
 * Static = Explicitly declared.
@ -71,17 +92,6 @@ function resolveMinRAM(){
 */
 const DEFAULT_CONFIG = {
    settings: {
-        java: {
-            minRAM: resolveMinRAM(),
-            maxRAM: resolveMaxRAM(), // Dynamic
-            executable: null,
-            jvmOptions: [
-                '-XX:+UseConcMarkSweepGC',
-                '-XX:+CMSIncrementalMode',
-                '-XX:-UseAdaptiveSizePolicy',
-                '-Xmn128M'
-            ],
-        },
        game: {
            resWidth: 1280,
            resHeight: 720,
@ -103,7 +113,8 @@ const DEFAULT_CONFIG = {
    selectedServer: null, // Resolved
    selectedAccount: null,
    authenticationDatabase: {},
-    modConfigurations: []
+    modConfigurations: [],
+    javaConfig: {}
 }

 let config = null
@ -177,7 +188,7 @@ function validateKeySet(srcObj, destObj){
    if(srcObj == null){
        srcObj = {}
    }
-    const validationBlacklist = ['authenticationDatabase']
+    const validationBlacklist = ['authenticationDatabase', 'javaConfig']
    const keys = Object.keys(srcObj)
    for(let i=0; i<keys.length; i++){
        if(typeof destObj[keys[i]] === 'undefined'){
@ -511,16 +522,66 @@ exports.setModConfiguration = function(serverid, configuration){

 // Java Settings

+function defaultJavaConfig(mcVersion) {
+    if(mcVersionAtLeast('1.17', mcVersion)) {
+        return defaultJavaConfig117()
+    } else {
+        return defaultJavaConfigBelow117()
+    }
+}
+
+function defaultJavaConfigBelow117() {
+    return {
+        minRAM: resolveMinRAM(),
+        maxRAM: resolveMaxRAM(), // Dynamic
+        executable: null,
+        jvmOptions: [
+            '-XX:+UseConcMarkSweepGC',
+            '-XX:+CMSIncrementalMode',
+            '-XX:-UseAdaptiveSizePolicy',
+            '-Xmn128M'
+        ],
+    }
+}
+
+function defaultJavaConfig117() {
+    return {
+        minRAM: resolveMinRAM(),
+        maxRAM: resolveMaxRAM(), // Dynamic
+        executable: null,
+        jvmOptions: [
+            '-XX:+UnlockExperimentalVMOptions',
+            '-XX:+UseG1GC',
+            '-XX:G1NewSizePercent=20',
+            '-XX:G1ReservePercent=20',
+            '-XX:MaxGCPauseMillis=50',
+            '-XX:G1HeapRegionSize=32M'
+        ],
+    }
+}
+
+/**
+ * Ensure a java config property is set for the given server.
+ * 
+ * @param {string} serverid The server id.
+ * @param {*} mcVersion The minecraft version of the server.
+ */
+exports.ensureJavaConfig = function(serverid, mcVersion) {
+    if(!Object.prototype.hasOwnProperty.call(config.javaConfig, serverid)) {
+        config.javaConfig[serverid] = defaultJavaConfig(mcVersion)
+    }
+}
+
 /**
 * Retrieve the minimum amount of memory for JVM initialization. This value
 * contains the units of memory. For example, '5G' = 5 GigaBytes, '1024M' = 
 * 1024 MegaBytes, etc.
 * 
- * @param {boolean} def Optional. If true, the default value will be returned.
+ * @param {string} serverid The server id.
 * @returns {string} The minimum amount of memory for JVM initialization.
 */
-exports.getMinRAM = function(def = false){
-    return !def ? config.settings.java.minRAM : DEFAULT_CONFIG.settings.java.minRAM
+exports.getMinRAM = function(serverid){
+    return config.javaConfig[serverid].minRAM
 }

 /**
@ -528,10 +589,11 @@ exports.getMinRAM = function(def = false){
 * contain the units of memory. For example, '5G' = 5 GigaBytes, '1024M' = 
 * 1024 MegaBytes, etc.
 * 
+ * @param {string} serverid The server id.
 * @param {string} minRAM The new minimum amount of memory for JVM initialization.
 */
-exports.setMinRAM = function(minRAM){
-    config.settings.java.minRAM = minRAM
+exports.setMinRAM = function(serverid, minRAM){
+    config.javaConfig[serverid].minRAM = minRAM
 }

 /**
@ -539,11 +601,11 @@ exports.setMinRAM = function(minRAM){
 * contains the units of memory. For example, '5G' = 5 GigaBytes, '1024M' = 
 * 1024 MegaBytes, etc.
 * 
- * @param {boolean} def Optional. If true, the default value will be returned.
+ * @param {string} serverid The server id.
 * @returns {string} The maximum amount of memory for JVM initialization.
 */
-exports.getMaxRAM = function(def = false){
-    return !def ? config.settings.java.maxRAM : resolveMaxRAM()
+exports.getMaxRAM = function(serverid){
+    return config.javaConfig[serverid].maxRAM
 }

 /**
@ -551,10 +613,11 @@ exports.getMaxRAM = function(def = false){
 * contain the units of memory. For example, '5G' = 5 GigaBytes, '1024M' = 
 * 1024 MegaBytes, etc.
 * 
+ * @param {string} serverid The server id.
 * @param {string} maxRAM The new maximum amount of memory for JVM initialization.
 */
-exports.setMaxRAM = function(maxRAM){
-    config.settings.java.maxRAM = maxRAM
+exports.setMaxRAM = function(serverid, maxRAM){
+    config.javaConfig[serverid].maxRAM = maxRAM
 }

 /**
@ -562,19 +625,21 @@ exports.setMaxRAM = function(maxRAM){
 * 
 * This is a resolved configuration value and defaults to null until externally assigned.
 * 
+ * @param {string} serverid The server id.
 * @returns {string} The path of the Java Executable.
 */
-exports.getJavaExecutable = function(){
-    return config.settings.java.executable
+exports.getJavaExecutable = function(serverid){
+    return config.javaConfig[serverid].executable
 }

 /**
 * Set the path of the Java Executable.
 * 
+ * @param {string} serverid The server id.
 * @param {string} executable The new path of the Java Executable.
 */
-exports.setJavaExecutable = function(executable){
-    config.settings.java.executable = executable
+exports.setJavaExecutable = function(serverid, executable){
+    config.javaConfig[serverid].executable = executable
 }

 /**
@ -582,11 +647,11 @@ exports.setJavaExecutable = function(executable){
 * such as memory allocation, will be dynamically resolved and will not be included
 * in this value.
 * 
- * @param {boolean} def Optional. If true, the default value will be returned.
+ * @param {string} serverid The server id.
 * @returns {Array.<string>} An array of the additional arguments for JVM initialization.
 */
-exports.getJVMOptions = function(def = false){
-    return !def ? config.settings.java.jvmOptions : DEFAULT_CONFIG.settings.java.jvmOptions
+exports.getJVMOptions = function(serverid){
+    return config.javaConfig[serverid].jvmOptions
 }

 /**
@ -594,11 +659,12 @@ exports.getJVMOptions = function(def = false){
 * such as memory allocation, will be dynamically resolved and should not be
 * included in this value.
 * 
+ * @param {string} serverid The server id.
 * @param {Array.<string>} jvmOptions An array of the new additional arguments for JVM 
 * initialization.
 */
-exports.setJVMOptions = function(jvmOptions){
-    config.settings.java.jvmOptions = jvmOptions
+exports.setJVMOptions = function(serverid, jvmOptions){
+    config.javaConfig[serverid].jvmOptions = jvmOptions
 }

 // Game Settings
--- a/app/assets/js/distromanager.js
+++ b/app/assets/js/distromanager.js
@ -118,7 +118,7 @@ class Module {
     * @returns {Module} The parsed Module.
     */
    static fromJSON(json, serverid){
-        return new Module(json.id, json.name, json.type, json.required, json.artifact, json.subModules, serverid)
+        return new Module(json.id, json.name, json.type, json.classpath, json.required, json.artifact, json.subModules, serverid)
    }

    /**
@ -143,9 +143,10 @@ class Module {
        }
    }

-    constructor(id, name, type, required, artifact, subModules, serverid) {
+    constructor(id, name, type, classpath, required, artifact, subModules, serverid) {
        this.identifier = id
        this.type = type
+        this.classpath = classpath
        this._resolveMetaData()
        this.name = name
        this.required = Required.fromJSON(required)
@ -306,6 +307,13 @@ class Module {
        return this.type
    }

+    /**
+     * @returns {boolean} Whether or not this library should be on the classpath.
+     */
+    getClasspath(){
+        return this.classpath ?? true
+    }
+
 }
 exports.Module

--- a/app/assets/js/processbuilder.js
+++ b/app/assets/js/processbuilder.js
@ -61,7 +61,7 @@ class ProcessBuilder {

        logger.log('Launch Arguments:', args)

-        const child = child_process.spawn(ConfigManager.getJavaExecutable(), args, {
+        const child = child_process.spawn(ConfigManager.getJavaExecutable(this.server.getID()), args, {
            cwd: this.gameDir,
            detached: ConfigManager.getLaunchDetached()
        })
@ -96,6 +96,16 @@ class ProcessBuilder {
        return child
    }

+    /**
+     * Get the platform specific classpath separator. On windows, this is a semicolon.
+     * On Unix, this is a colon.
+     * 
+     * @returns {string} The classpath separator for the current operating system.
+     */
+    static getClasspathSeparator() {
+        return process.platform === 'win32' ? ';' : ':'
+    }
+
    /**
     * Determine if an optional mod is enabled from its configuration value. If the
     * configuration value is null, the required object will be used to
@ -339,16 +349,16 @@ class ProcessBuilder {

        // Classpath Argument
        args.push('-cp')
-        args.push(this.classpathArg(mods, tempNativePath).join(process.platform === 'win32' ? ';' : ':'))
+        args.push(this.classpathArg(mods, tempNativePath).join(ProcessBuilder.getClasspathSeparator()))

        // Java Arguments
        if(process.platform === 'darwin'){
            args.push('-Xdock:name=HeliosLauncher')
            args.push('-Xdock:icon=' + path.join(__dirname, '..', 'images', 'minecraft.icns'))
        }
-        args.push('-Xmx' + ConfigManager.getMaxRAM())
-        args.push('-Xms' + ConfigManager.getMinRAM())
-        args = args.concat(ConfigManager.getJVMOptions())
+        args.push('-Xmx' + ConfigManager.getMaxRAM(this.server.getID()))
+        args.push('-Xms' + ConfigManager.getMinRAM(this.server.getID()))
+        args = args.concat(ConfigManager.getJVMOptions(this.server.getID()))
        args.push('-Djava.library.path=' + tempNativePath)

        // Main Java Class
@ -377,6 +387,19 @@ class ProcessBuilder {
        // JVM Arguments First
        let args = this.versionData.arguments.jvm

+        // Debug securejarhandler
+        // args.push('-Dbsl.debug=true')
+
+        if(this.forgeData.arguments.jvm != null) {
+            for(const argStr of this.forgeData.arguments.jvm) {
+                args.push(argStr
+                    .replaceAll('${library_directory}', this.libPath)
+                    .replaceAll('${classpath_separator}', ProcessBuilder.getClasspathSeparator())
+                    .replaceAll('${version_name}', this.forgeData.id)
+                )
+            }
+        }
+
        //args.push('-Dlog4j.configurationFile=D:\\WesterosCraft\\game\\common\\assets\\log_configs\\client-1.12.xml')

        // Java Arguments
@ -384,9 +407,9 @@ class ProcessBuilder {
            args.push('-Xdock:name=HeliosLauncher')
            args.push('-Xdock:icon=' + path.join(__dirname, '..', 'images', 'minecraft.icns'))
        }
-        args.push('-Xmx' + ConfigManager.getMaxRAM())
-        args.push('-Xms' + ConfigManager.getMinRAM())
-        args = args.concat(ConfigManager.getJVMOptions())
+        args.push('-Xmx' + ConfigManager.getMaxRAM(this.server.getID()))
+        args.push('-Xms' + ConfigManager.getMinRAM(this.server.getID()))
+        args = args.concat(ConfigManager.getJVMOptions(this.server.getID()))

        // Main Java Class
        args.push(this.forgeData.mainClass)
@ -489,7 +512,7 @@ class ProcessBuilder {
                            val = args[i].replace(argDiscovery, this.launcherVersion)
                            break
                        case 'classpath':
-                            val = this.classpathArg(mods, tempNativePath).join(process.platform === 'win32' ? ';' : ':')
+                            val = this.classpathArg(mods, tempNativePath).join(ProcessBuilder.getClasspathSeparator())
                            break
                    }
                    if(val != null){
@ -647,9 +670,13 @@ class ProcessBuilder {
    classpathArg(mods, tempNativePath){
        let cpArgs = []

-        // Add the version.jar to the classpath.
-        const version = this.versionData.id
-        cpArgs.push(path.join(this.commonDir, 'versions', version, version + '.jar'))
+        if(!Util.mcVersionAtLeast('1.17', this.server.getMinecraftVersion())) {
+            // Add the version.jar to the classpath.
+            // Must not be added to the classpath for Forge 1.17+.
+            const version = this.versionData.id
+            cpArgs.push(path.join(this.commonDir, 'versions', version, version + '.jar'))
+        }
+        

        if(this.usingLiteLoader){
            cpArgs.push(this.llPath)
@ -682,6 +709,7 @@ class ProcessBuilder {
     * @returns {{[id: string]: string}} An object containing the paths of each library mojang declares.
     */
    _resolveMojangLibraries(tempNativePath){
+        const nativesRegex = /.+:natives-([^-]+)(?:-(.+))?/
        const libs = {}

        const libArr = this.versionData.libraries
@ -689,27 +717,23 @@ class ProcessBuilder {
        for(let i=0; i<libArr.length; i++){
            const lib = libArr[i]
            if(Library.validateRules(lib.rules, lib.natives)){
-                if(lib.natives == null){
-                    const dlInfo = lib.downloads
-                    const artifact = dlInfo.artifact
-                    const to = path.join(this.libPath, artifact.path)
-                    const versionIndependentId = lib.name.substring(0, lib.name.lastIndexOf(':'))
-                    libs[versionIndependentId] = to
-                } else {
+
+                // Pre-1.19 has a natives object.
+                if(lib.natives != null) {
                    // Extract the native library.
                    const exclusionArr = lib.extract != null ? lib.extract.exclude : ['META-INF/']
                    const artifact = lib.downloads.classifiers[lib.natives[Library.mojangFriendlyOS()].replace('${arch}', process.arch.replace('x', ''))]
-    
+
                    // Location of native zip.
                    const to = path.join(this.libPath, artifact.path)
-    
+
                    let zip = new AdmZip(to)
                    let zipEntries = zip.getEntries()
-    
+
                    // Unzip the native zip.
                    for(let i=0; i<zipEntries.length; i++){
                        const fileName = zipEntries[i].entryName
-    
+
                        let shouldExclude = false

                        // Exclude noted files.
@ -727,9 +751,68 @@ class ProcessBuilder {
                                }
                            })
                        }
-    
+
                    }
                }
+                // 1.19+ logic
+                else if(lib.name.includes('natives-')) {
+
+                    const regexTest = nativesRegex.exec(lib.name)
+                    // const os = regexTest[1]
+                    const arch = regexTest[2] ?? 'x64'
+
+                    if(arch != process.arch) {
+                        continue
+                    }
+
+                    // Extract the native library.
+                    const exclusionArr = lib.extract != null ? lib.extract.exclude : ['META-INF/', '.git', '.sha1']
+                    const artifact = lib.downloads.artifact
+
+                    // Location of native zip.
+                    const to = path.join(this.libPath, artifact.path)
+
+                    let zip = new AdmZip(to)
+                    let zipEntries = zip.getEntries()
+
+                    // Unzip the native zip.
+                    for(let i=0; i<zipEntries.length; i++){
+                        if(zipEntries[i].isDirectory) {
+                            continue
+                        }
+
+                        const fileName = zipEntries[i].entryName
+
+                        let shouldExclude = false
+
+                        // Exclude noted files.
+                        exclusionArr.forEach(function(exclusion){
+                            if(fileName.indexOf(exclusion) > -1){
+                                shouldExclude = true
+                            }
+                        })
+
+                        const extractName = fileName.includes('/') ? fileName.substring(fileName.lastIndexOf('/')) : fileName
+
+                        // Extract the file.
+                        if(!shouldExclude){
+                            fs.writeFile(path.join(tempNativePath, extractName), zipEntries[i].getData(), (err) => {
+                                if(err){
+                                    logger.error('Error while extracting native library:', err)
+                                }
+                            })
+                        }
+
+                    }
+                }
+                // No natives
+                else {
+                    const dlInfo = lib.downloads
+                    const artifact = dlInfo.artifact
+                    const to = path.join(this.libPath, artifact.path)
+                    const versionIndependentId = lib.name.substring(0, lib.name.lastIndexOf(':'))
+                    libs[versionIndependentId] = to
+                }
            }
        }

@ -788,7 +871,10 @@ class ProcessBuilder {
        let libs = []
        for(let sm of mdl.getSubModules()){
            if(sm.getType() === DistroManager.Types.Library){
-                libs.push(sm.getArtifact().getPath())
+
+                if(sm.getClasspath()) {
+                    libs.push(sm.getArtifact().getPath())
+                }
            }
            // If this module has submodules, we need to resolve the libraries for those.
            // To avoid unnecessary recursive calls, base case is checked here.
--- a/app/assets/js/scripts/landing.js
+++ b/app/assets/js/scripts/landing.js
@ -10,6 +10,7 @@ const { MojangRestAPI, getServerStatus }     = require('helios-core/mojang')
 // Internal Requirements
 const DiscordWrapper          = require('./assets/js/discordwrapper')
 const ProcessBuilder          = require('./assets/js/processbuilder')
+const { Util } = require('./assets/js/assetguard')
 const { RestResponseStatus, isDisplayableError } = require('helios-core/common')

 // Launch Elements
@ -87,7 +88,7 @@ function setLaunchEnabled(val){
 document.getElementById('launch_button').addEventListener('click', function(e){
    loggerLanding.log('Launching game..')
    const mcVersion = DistroManager.getDistribution().getServer(ConfigManager.getSelectedServer()).getMinecraftVersion()
-    const jExe = ConfigManager.getJavaExecutable()
+    const jExe = ConfigManager.getJavaExecutable(ConfigManager.getSelectedServer())
    if(jExe == null){
        asyncSystemScan(mcVersion)
    } else {
@ -140,13 +141,13 @@ updateSelectedAccount(ConfigManager.getSelectedAccount())
 // Bind selected server
 function updateSelectedServer(serv){
    if(getCurrentView() === VIEWS.settings){
-        saveAllModConfigurations()
+        fullSettingsSave()
    }
    ConfigManager.setSelectedServer(serv != null ? serv.getID() : null)
    ConfigManager.save()
    server_selection_button.innerHTML = '\u2022 ' + (serv != null ? serv.getName() : 'No Server Selected')
    if(getCurrentView() === VIEWS.settings){
-        animateModsTabRefresh()
+        animateSettingsTabRefresh()
    }
    setLaunchEnabled(serv != null)
 }
@ -317,6 +318,8 @@ function asyncSystemScan(mcVersion, launchAfter = true){
    sysAEx.stdio[2].on('data', (data) => {
        loggerSysAEx.log(data)
    })
+
+    const javaVer = Util.mcVersionAtLeast('1.17', mcVersion) ? '17' : '8'
    
    sysAEx.on('message', (m) => {

@ -326,14 +329,14 @@ function asyncSystemScan(mcVersion, launchAfter = true){
                // Show this information to the user.
                setOverlayContent(
                    'No Compatible<br>Java Installation Found',
-                    'In order to join WesterosCraft, you need a 64-bit installation of Java 8. Would you like us to install a copy?',
+                    `In order to join WesterosCraft, you need a 64-bit installation of Java ${javaVer}. Would you like us to install a copy?`,
                    'Install Java',
                    'Install Manually'
                )
                setOverlayHandler(() => {
                    setLaunchDetails('Preparing Java Download..')
-                    sysAEx.send({task: 'changeContext', class: 'AssetGuard', args: [ConfigManager.getCommonDirectory(),ConfigManager.getJavaExecutable()]})
-                    sysAEx.send({task: 'execute', function: '_enqueueOpenJDK', argsArr: [ConfigManager.getDataDirectory()]})
+                    sysAEx.send({task: 'changeContext', class: 'AssetGuard', args: [ConfigManager.getCommonDirectory(),ConfigManager.getJavaExecutable(ConfigManager.getSelectedServer())]})
+                    sysAEx.send({task: 'execute', function: '_enqueueOpenJDK', argsArr: [ConfigManager.getDataDirectory(), mcVersion]})
                    toggleOverlay(false)
                })
                setDismissHandler(() => {
@ -341,7 +344,7 @@ function asyncSystemScan(mcVersion, launchAfter = true){
                        //$('#overlayDismiss').toggle(false)
                        setOverlayContent(
                            'Java is Required<br>to Launch',
-                            'A valid x64 installation of Java 8 is required to launch.<br><br>Please refer to our <a href="https://github.com/dscalzi/HeliosLauncher/wiki/Java-Management#manually-installing-a-valid-version-of-java">Java Management Guide</a> for instructions on how to manually install Java.',
+                            `A valid x64 installation of Java ${javaVer} is required to launch.<br><br>Please refer to our <a href="https://github.com/dscalzi/HeliosLauncher/wiki/Java-Management#manually-installing-a-valid-version-of-java">Java Management Guide</a> for instructions on how to manually install Java.`,
                            'I Understand',
                            'Go Back'
                        )
@ -360,7 +363,7 @@ function asyncSystemScan(mcVersion, launchAfter = true){

            } else {
                // Java installation found, use this to launch the game.
-                ConfigManager.setJavaExecutable(m.result)
+                ConfigManager.setJavaExecutable(ConfigManager.getSelectedServer(), m.result)
                ConfigManager.save()

                // We need to make sure that the updated value is on the settings UI.
@ -434,7 +437,7 @@ function asyncSystemScan(mcVersion, launchAfter = true){
                    remote.getCurrentWindow().setProgressBar(-1)

                    // Extraction completed successfully.
-                    ConfigManager.setJavaExecutable(m.args[0])
+                    ConfigManager.setJavaExecutable(ConfigManager.getSelectedServer(), m.args[0])
                    ConfigManager.save()

                    if(extractListener != null){
@ -506,7 +509,7 @@ function dlAsync(login = true){
    aEx = cp.fork(path.join(__dirname, 'assets', 'js', 'assetexec.js'), [
        'AssetGuard',
        ConfigManager.getCommonDirectory(),
-        ConfigManager.getJavaExecutable()
+        ConfigManager.getJavaExecutable(ConfigManager.getSelectedServer())
    ], {
        env: forkEnv,
        stdio: 'pipe'
--- a/app/assets/js/scripts/settings.js
+++ b/app/assets/js/scripts/settings.js
@ -127,29 +127,34 @@ function initSettingsValues(){
    const sEls = document.getElementById('settingsContainer').querySelectorAll('[cValue]')
    Array.from(sEls).map((v, index, arr) => {
        const cVal = v.getAttribute('cValue')
+        const serverDependent = v.hasAttribute('serverDependent') // Means the first argument is the server id.
        const gFn = ConfigManager['get' + cVal]
+        const gFnOpts = []
+        if(serverDependent) {
+            gFnOpts.push(ConfigManager.getSelectedServer())
+        }
        if(typeof gFn === 'function'){
            if(v.tagName === 'INPUT'){
                if(v.type === 'number' || v.type === 'text'){
                    // Special Conditions
                    if(cVal === 'JavaExecutable'){
+                        v.value = gFn.apply(null, gFnOpts)
                        populateJavaExecDetails(v.value)
-                        v.value = gFn()
                    } else if (cVal === 'DataDirectory'){
-                        v.value = gFn()
+                        v.value = gFn.apply(null, gFnOpts)
                    } else if(cVal === 'JVMOptions'){
-                        v.value = gFn().join(' ')
+                        v.value = gFn.apply(null, gFnOpts).join(' ')
                    } else {
-                        v.value = gFn()
+                        v.value = gFn.apply(null, gFnOpts)
                    }
                } else if(v.type === 'checkbox'){
-                    v.checked = gFn()
+                    v.checked = gFn.apply(null, gFnOpts)
                }
            } else if(v.tagName === 'DIV'){
                if(v.classList.contains('rangeSlider')){
                    // Special Conditions
                    if(cVal === 'MinRAM' || cVal === 'MaxRAM'){
-                        let val = gFn()
+                        let val = gFn.apply(null, gFnOpts)
                        if(val.endsWith('M')){
                            val = Number(val.substring(0, val.length-1))/1000
                        } else {
@ -158,7 +163,7 @@ function initSettingsValues(){

                        v.setAttribute('value', val)
                    } else {
-                        v.setAttribute('value', Number.parseFloat(gFn()))
+                        v.setAttribute('value', Number.parseFloat(gFn.apply(null, gFnOpts)))
                    }
                }
            }
@ -174,22 +179,31 @@ function saveSettingsValues(){
    const sEls = document.getElementById('settingsContainer').querySelectorAll('[cValue]')
    Array.from(sEls).map((v, index, arr) => {
        const cVal = v.getAttribute('cValue')
+        const serverDependent = v.hasAttribute('serverDependent') // Means the first argument is the server id.
        const sFn = ConfigManager['set' + cVal]
+        const sFnOpts = []
+        if(serverDependent) {
+            sFnOpts.push(ConfigManager.getSelectedServer())
+        }
        if(typeof sFn === 'function'){
            if(v.tagName === 'INPUT'){
                if(v.type === 'number' || v.type === 'text'){
                    // Special Conditions
                    if(cVal === 'JVMOptions'){
                        if(!v.value.trim()) {
-                            sFn([])
+                            sFnOpts.push([])
+                            sFn.apply(null, sFnOpts)
                        } else {
-                            sFn(v.value.trim().split(/\s+/))
+                            sFnOpts.push(v.value.trim().split(/\s+/))
+                            sFn.apply(null, sFnOpts)
                        }
                    } else {
-                        sFn(v.value)
+                        sFnOpts.push(v.value)
+                        sFn.apply(null, sFnOpts)
                    }
                } else if(v.type === 'checkbox'){
-                    sFn(v.checked)
+                    sFnOpts.push(v.checked)
+                    sFn.apply(null, sFnOpts)
                    // Special Conditions
                    if(cVal === 'AllowPrerelease'){
                        changeAllowPrerelease(v.checked)
@ -206,9 +220,11 @@ function saveSettingsValues(){
                            val = val + 'G'
                        }

-                        sFn(val)
+                        sFnOpts.push(val)
+                        sFn.apply(null, sFnOpts)
                    } else {
-                        sFn(v.getAttribute('value'))
+                        sFnOpts.push(v.getAttribute('value'))
+                        sFn.apply(null, sFnOpts)
                    }
                }
            }
@ -305,13 +321,17 @@ function settingsSaveDisabled(v){
    settingsNavDone.disabled = v
 }

-/* Closes the settings view and saves all data. */
-settingsNavDone.onclick = () => {
+function fullSettingsSave() {
    saveSettingsValues()
    saveModConfiguration()
    ConfigManager.save()
    saveDropinModConfiguration()
    saveShaderpackSettings()
+}
+
+/* Closes the settings view and saves all data. */
+settingsNavDone.onclick = () => {
+    fullSettingsSave()
    switchView(getCurrentView(), VIEWS.landing)
 }

@ -1056,33 +1076,37 @@ function bindShaderpackButton() {
 function loadSelectedServerOnModsTab(){
    const serv = DistroManager.getDistribution().getServer(ConfigManager.getSelectedServer())

-    document.getElementById('settingsSelServContent').innerHTML = `
-        <img class="serverListingImg" src="${serv.getIcon()}"/>
-        <div class="serverListingDetails">
-            <span class="serverListingName">${serv.getName()}</span>
-            <span class="serverListingDescription">${serv.getDescription()}</span>
-            <div class="serverListingInfo">
-                <div class="serverListingVersion">${serv.getMinecraftVersion()}</div>
-                <div class="serverListingRevision">${serv.getVersion()}</div>
-                ${serv.isMainServer() ? `<div class="serverListingStarWrapper">
-                    <svg id="Layer_1" viewBox="0 0 107.45 104.74" width="20px" height="20px">
-                        <defs>
-                            <style>.cls-1{fill:#fff;}.cls-2{fill:none;stroke:#fff;stroke-miterlimit:10;}</style>
-                        </defs>
-                        <path class="cls-1" d="M100.93,65.54C89,62,68.18,55.65,63.54,52.13c2.7-5.23,18.8-19.2,28-27.55C81.36,31.74,63.74,43.87,58.09,45.3c-2.41-5.37-3.61-26.52-4.37-39-.77,12.46-2,33.64-4.36,39-5.7-1.46-23.3-13.57-33.49-20.72,9.26,8.37,25.39,22.36,28,27.55C39.21,55.68,18.47,62,6.52,65.55c12.32-2,33.63-6.06,39.34-4.9-.16,5.87-8.41,26.16-13.11,37.69,6.1-10.89,16.52-30.16,21-33.9,4.5,3.79,14.93,23.09,21,34C70,86.84,61.73,66.48,61.59,60.65,67.36,59.49,88.64,63.52,100.93,65.54Z"/>
-                        <circle class="cls-2" cx="53.73" cy="53.9" r="38"/>
-                    </svg>
-                    <span class="serverListingStarTooltip">Main Server</span>
-                </div>` : ''}
+    for(const el of document.getElementsByClassName('settingsSelServContent')) {
+        el.innerHTML = `
+            <img class="serverListingImg" src="${serv.getIcon()}"/>
+            <div class="serverListingDetails">
+                <span class="serverListingName">${serv.getName()}</span>
+                <span class="serverListingDescription">${serv.getDescription()}</span>
+                <div class="serverListingInfo">
+                    <div class="serverListingVersion">${serv.getMinecraftVersion()}</div>
+                    <div class="serverListingRevision">${serv.getVersion()}</div>
+                    ${serv.isMainServer() ? `<div class="serverListingStarWrapper">
+                        <svg id="Layer_1" viewBox="0 0 107.45 104.74" width="20px" height="20px">
+                            <defs>
+                                <style>.cls-1{fill:#fff;}.cls-2{fill:none;stroke:#fff;stroke-miterlimit:10;}</style>
+                            </defs>
+                            <path class="cls-1" d="M100.93,65.54C89,62,68.18,55.65,63.54,52.13c2.7-5.23,18.8-19.2,28-27.55C81.36,31.74,63.74,43.87,58.09,45.3c-2.41-5.37-3.61-26.52-4.37-39-.77,12.46-2,33.64-4.36,39-5.7-1.46-23.3-13.57-33.49-20.72,9.26,8.37,25.39,22.36,28,27.55C39.21,55.68,18.47,62,6.52,65.55c12.32-2,33.63-6.06,39.34-4.9-.16,5.87-8.41,26.16-13.11,37.69,6.1-10.89,16.52-30.16,21-33.9,4.5,3.79,14.93,23.09,21,34C70,86.84,61.73,66.48,61.59,60.65,67.36,59.49,88.64,63.52,100.93,65.54Z"/>
+                            <circle class="cls-2" cx="53.73" cy="53.9" r="38"/>
+                        </svg>
+                        <span class="serverListingStarTooltip">Main Server</span>
+                    </div>` : ''}
+                </div>
            </div>
-        </div>
-    `
+        `
+    }
 }

 // Bind functionality to the server switch button.
-document.getElementById('settingsSwitchServerButton').addEventListener('click', (e) => {
-    e.target.blur()
-    toggleServerSelection(true)
+Array.from(document.getElementsByClassName('settingsSwitchServerButton')).forEach(el => {
+    el.addEventListener('click', (e) => {
+        e.target.blur()
+        toggleServerSelection(true)
+    })
 })

 /**
@ -1095,13 +1119,13 @@ function saveAllModConfigurations(){
 }

 /**
- * Function to refresh the mods tab whenever the selected
+ * Function to refresh the current tab whenever the selected
 * server is changed.
 */
-function animateModsTabRefresh(){
-    $('#settingsTabMods').fadeOut(500, () => {
-        prepareModsTab()
-        $('#settingsTabMods').fadeIn(500)
+function animateSettingsTabRefresh(){
+    $(`#${selectedSettingsTab}`).fadeOut(500, () => {
+        prepareSettings()
+        $(`#${selectedSettingsTab}`).fadeIn(500)
    })
 }

@ -1131,6 +1155,8 @@ const settingsMinRAMLabel     = document.getElementById('settingsMinRAMLabel')
 const settingsMemoryTotal     = document.getElementById('settingsMemoryTotal')
 const settingsMemoryAvail     = document.getElementById('settingsMemoryAvail')
 const settingsJavaExecDetails = document.getElementById('settingsJavaExecDetails')
+const settingsJavaReqDesc     = document.getElementById('settingsJavaReqDesc')
+const settingsJvmOptsLink     = document.getElementById('settingsJvmOptsLink')

 // Store maximum memory values.
 const SETTINGS_MAX_MEMORY = ConfigManager.getAbsoluteMaxRAM()
@ -1338,12 +1364,34 @@ function populateJavaExecDetails(execPath){
    })
 }

+function populateJavaReqDesc() {
+    const mcVer = DistroManager.getDistribution().getServer(ConfigManager.getSelectedServer()).getMinecraftVersion()
+    if(Util.mcVersionAtLeast('1.17', mcVer)) {
+        settingsJavaReqDesc.innerHTML = 'Requires Java 17 x64.'
+    } else {
+        settingsJavaReqDesc.innerHTML = 'Requires Java 8 x64.'
+    }
+}
+
+function populateJvmOptsLink() {
+    const mcVer = DistroManager.getDistribution().getServer(ConfigManager.getSelectedServer()).getMinecraftVersion()
+    if(Util.mcVersionAtLeast('1.17', mcVer)) {
+        settingsJvmOptsLink.innerHTML = 'Available Options for Java 17 (HotSpot VM)'
+        settingsJvmOptsLink.href = 'https://docs.oracle.com/en/java/javase/17/docs/specs/man/java.html#extra-options-for-java'
+    } else {
+        settingsJvmOptsLink.innerHTML = 'Available Options for Java 8 (HotSpot VM)'
+        settingsJvmOptsLink.href = `https://docs.oracle.com/javase/8/docs/technotes/tools/${process.platform === 'win32' ? 'windows' : 'unix'}/java.html`
+    }
+}
+
 /**
 * Prepare the Java tab for display.
 */
 function prepareJavaTab(){
    bindRangeSlider()
    populateMemoryStatus()
+    populateJavaReqDesc()
+    populateJvmOptsLink()
 }

 /**
--- a/app/assets/js/scripts/uibinder.js
+++ b/app/assets/js/scripts/uibinder.js
@ -137,6 +137,7 @@ function onDistroRefresh(data){
    refreshServerStatus()
    initNews()
    syncModConfigurations(data)
+    ensureJavaSettings(data)
 }

 /**
@ -223,6 +224,21 @@ function syncModConfigurations(data){
    ConfigManager.save()
 }

+/**
+ * Ensure java configurations are present for the available servers.
+ * 
+ * @param {Object} data The distro index object.
+ */
+function ensureJavaSettings(data) {
+
+    // Nothing too fancy for now.
+    for(const serv of data.getServers()){
+        ConfigManager.ensureJavaConfig(serv.getID(), serv.getMinecraftVersion())
+    }
+
+    ConfigManager.save()
+}
+
 /**
 * Recursively scan for optional sub modules. If none are found,
 * this function returns a boolean. If optional sub modules do exist,
@ -434,6 +450,7 @@ ipcRenderer.on('distributionIndexDone', (event, res) => {
    if(res) {
        const data = DistroManager.getDistribution()
        syncModConfigurations(data)
+        ensureJavaSettings(data)
        if(document.readyState === 'interactive' || document.readyState === 'complete'){
            showMainUI(data)
        } else {
@ -448,3 +465,13 @@ ipcRenderer.on('distributionIndexDone', (event, res) => {
        }
    }
 })
+
+// Util for development
+function devModeToggle() {
+    DistroManager.setDevMode(true)
+    DistroManager.pullLocal().then((data) => {
+        ensureJavaSettings(data)
+        updateSelectedServer(data.getServers()[0])
+        syncModConfigurations(data)
+    })
+}
--- a/app/settings.ejs
+++ b/app/settings.ejs
@ -122,13 +122,13 @@
                <span class="settingsTabHeaderText">Mod Settings</span>
                <span class="settingsTabHeaderDesc">Enable or disable mods.</span>
            </div>
-            <div id="settingsSelServContainer">
-                <div id="settingsSelServContent">
+            <div class="settingsSelServContainer">
+                <div class="settingsSelServContent">

                </div>
-                <div id="settingsSwitchServerContainer">
-                    <div id="settingsSwitchServerContent">
-                        <button id="settingsSwitchServerButton">Switch</button>
+                <div class="settingsSwitchServerContainer">
+                    <div class="settingsSwitchServerContent">
+                        <button class="settingsSwitchServerButton">Switch</button>
                    </div>
                </div>
            </div>
@ -172,6 +172,16 @@
                <span class="settingsTabHeaderText">Java Settings</span>
                <span class="settingsTabHeaderDesc">Manage the Java configuration (advanced).</span>
            </div>
+            <div class="settingsSelServContainer">
+                <div class="settingsSelServContent">
+
+                </div>
+                <div class="settingsSwitchServerContainer">
+                    <div class="settingsSwitchServerContent">
+                        <button class="settingsSwitchServerButton">Switch</button>
+                    </div>
+                </div>
+            </div>
            <div id="settingsMemoryContainer">
                <div id="settingsMemoryTitle">Memory</div>
                <div id="settingsMemoryContent">
@ -179,7 +189,7 @@
                        <div class="settingsMemoryContentItem">
                            <span class="settingsMemoryHeader">Maximum RAM</span>
                            <div class="settingsMemoryActionContainer">
-                                <div id="settingsMaxRAMRange" class="rangeSlider" cValue="MaxRAM" min="3" max="8" value="3" step="0.5">
+                                <div id="settingsMaxRAMRange" class="rangeSlider" cValue="MaxRAM" serverDependent min="3" max="8" value="3" step="0.5">
                                    <div class="rangeSliderBar"></div>
                                    <div class="rangeSliderTrack"></div>
                                </div>
@ -189,7 +199,7 @@
                        <div class="settingsMemoryContentItem">
                            <span class="settingsMemoryHeader">Minimum RAM</span>
                            <div class="settingsMemoryActionContainer">
-                                <div id="settingsMinRAMRange" class="rangeSlider" cValue="MinRAM" min="3" max="8" value="3" step="0.5">
+                                <div id="settingsMinRAMRange" class="rangeSlider" cValue="MinRAM" serverDependent min="3" max="8" value="3" step="0.5">
                                    <div class="rangeSliderBar"></div>
                                    <div class="rangeSliderTrack"></div>
                                </div>
@ -231,11 +241,11 @@
                                </g>
                            </svg>
                        </div>
-                        <input class="settingsFileSelVal" id="settingsJavaExecVal" type="text" value="null" cValue="JavaExecutable" disabled>
+                        <input class="settingsFileSelVal" id="settingsJavaExecVal" type="text" value="null" cValue="JavaExecutable" serverDependent disabled>
                        <button class="settingsFileSelButton" id="settingsJavaExecSel" dialogTitle="Select Java Executable" dialogDirectory="false">Choose File</button>
                    </div>
                </div>
-                <div class="settingsFileSelDesc">The Java executable is validated before game launch. <strong>Requires Java 8 x64.</strong><br>The path should end with <strong>bin<%= process.platform === 'win32' ? '\\javaw.exe' : '/java' %></strong>.</div>
+                <div class="settingsFileSelDesc">The Java executable is validated before game launch. <strong id="settingsJavaReqDesc">Requires Java 8 x64.</strong><br>The path should end with <strong>bin<%= process.platform === 'win32' ? '\\javaw.exe' : '/java' %></strong>.</div>
            </div>
            <div id="settingsJVMOptsContainer">
                <div id="settingsJVMOptsTitle">Additional JVM Options</div>
@ -254,9 +264,9 @@
                            </g>
                        </svg>
                    </div>
-                    <input id="settingsJVMOptsVal" cValue="JVMOptions" type="text">
+                    <input id="settingsJVMOptsVal" cValue="JVMOptions" serverDependent type="text">
                </div>
-                <div id="settingsJVMOptsDesc">Options to be provided to the JVM at runtime. <em>-Xms</em> and <em>-Xmx</em> should not be included.<br><a href="https://docs.oracle.com/javase/8/docs/technotes/tools/<%= process.platform === 'win32' ? 'windows' : 'unix' %>/java.html">Available Options for Java 8</a>.</div>
+                <div id="settingsJVMOptsDesc">Options to be provided to the JVM at runtime. <em>-Xms</em> and <em>-Xmx</em> should not be included.<br><a href="https://docs.oracle.com/javase/8/docs/technotes/tools/<%= process.platform === 'win32' ? 'windows' : 'unix' %>/java.html" id="settingsJvmOptsLink">Available Options for Java 8</a>.</div>
            </div>
        </div>
        <div id="settingsTabLauncher" class="settingsTab" style="display: none;">
--- a/docs/distro.md
+++ b/docs/distro.md
@ -208,6 +208,12 @@ The name of the module. Used on the UI.

 The type of the module.

+### `Module.classpath: boolean`
+
+**OPTIONAL**
+
+If the module is of type `Library`, whether the library should be added to the classpath. Defaults to true.
+
 ### `Module.required: Required`

 **OPTIONAL**
--- a/package-lock.json
+++ b/package-lock.json
@ -21,6 +21,7 @@
        "got": "^11.8.5",
        "helios-core": "~0.1.2",
        "jquery": "^3.6.1",
+        "node-disk-info": "^1.3.0",
        "node-stream-zip": "^1.15.0",
        "request": "^2.88.2",
        "semver": "^7.3.8",
@ -28,9 +29,9 @@
        "winreg": "^1.2.4"
      },
      "devDependencies": {
-        "electron": "^21.2.2",
+        "electron": "^21.3.1",
        "electron-builder": "^23.6.0",
-        "eslint": "^8.27.0"
+        "eslint": "^8.28.0"
      },
      "engines": {
        "node": "16.x.x"
@ -482,14 +483,14 @@
      }
    },
    "node_modules/@types/cacheable-request": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.2.tgz",
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+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.3.tgz",
+      "integrity": "sha512-IQ3EbTzGxIigb1I3qPZc1rWJnH0BmSKv5QYTalEwweFvyBDLSAe24zP0le/hyi7ecGfZVlIVAg4BZqb8WBwKqw==",
      "dependencies": {
        "@types/http-cache-semantics": "*",
-        "@types/keyv": "*",
+        "@types/keyv": "^3.1.4",
        "@types/node": "*",
-        "@types/responselike": "*"
+        "@types/responselike": "^1.0.0"
      }
    },
    "node_modules/@types/debug": {
@ -527,12 +528,11 @@
      "integrity": "sha512-SZs7ekbP8CN0txVG2xVRH6EgKmEm31BOxA07vkFaETzZz1xh+cbt8BcI0slpymvwhx5dlFnQG2rTlPVQn+iRPQ=="
    },
    "node_modules/@types/keyv": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-4.2.0.tgz",
-      "integrity": "sha512-xoBtGl5R9jeKUhc8ZqeYaRDx04qqJ10yhhXYGmJ4Jr8qKpvMsDQQrNUvF/wUJ4klOtmJeJM+p2Xo3zp9uaC3tw==",
-      "deprecated": "This is a stub types definition. keyv provides its own type definitions, so you do not need this installed.",
+      "version": "3.1.4",
+      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-3.1.4.tgz",
+      "integrity": "sha512-BQ5aZNSCpj7D6K2ksrRCTmKRLEpnPvWDiLPfoGyhZ++8YtiK9d/3DBKPJgry359X/P1PfruyYwvnvwFjuEiEIg==",
      "dependencies": {
-        "keyv": "*"
+        "@types/node": "*"
      }
    },
    "node_modules/@types/minimatch": {
@ -585,9 +585,9 @@
      "optional": true
    },
    "node_modules/@types/yargs": {
-      "version": "17.0.13",
-      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.13.tgz",
-      "integrity": "sha512-9sWaruZk2JGxIQU+IhI1fhPYRcQ0UuTNuKuCW9bR5fp7qi2Llf7WDzNa17Cy7TKnh3cdxDOiyTu6gaLS0eDatg==",
+      "version": "17.0.14",
+      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.14.tgz",
+      "integrity": "sha512-9Pj7abXoW1RSTcZaL2Hk6G2XyLMlp5ECdVC/Zf2p/KBjC3srijLGgRAXOBjtFrJoIrvxdTKyKDA14bEcbxBaWw==",
      "dev": true,
      "dependencies": {
        "@types/yargs-parser": "*"
@ -1086,10 +1086,13 @@
      "dev": true
    },
    "node_modules/ci-info": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.5.0.tgz",
-      "integrity": "sha512-yH4RezKOGlOhxkmhbeNuC4eYZKAUsEaGtBuBzDDP1eFUKiccDWzBABxBfOx31IDwDIXMTxWuwAxUGModvkbuVw==",
-      "dev": true
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.7.0.tgz",
+      "integrity": "sha512-2CpRNYmImPx+RXKLq6jko/L07phmS9I02TyqkcNU20GCF/GgaWvc58hPtjxDX8lPpkdwc9sNh72V9k00S7ezog==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
    },
    "node_modules/cli-truncate": {
      "version": "2.1.0",
@ -1523,9 +1526,9 @@
      }
    },
    "node_modules/electron": {
-      "version": "21.2.2",
-      "resolved": "https://registry.npmjs.org/electron/-/electron-21.2.2.tgz",
-      "integrity": "sha512-Q0j1tzLTM5JRjSJVAfDSONZgdtuyruHR1pc1y2IbMYQz62pVJWVWAvcJXzpty5iRh2HKzW9+B9WVlmfWNFA8ag==",
+      "version": "21.3.1",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-21.3.1.tgz",
+      "integrity": "sha512-Ik/I9oFHA1h32JRtRm6GMgYdUctFpF/tPnHyATg4r3LXBTUT6habGh3GxSdmmTa5JgtA7uJUEm8EjjZItk7T3g==",
      "hasInstallScript": true,
      "dependencies": {
        "@electron/get": "^1.14.1",
@ -1710,9 +1713,9 @@
      }
    },
    "node_modules/eslint": {
-      "version": "8.27.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.27.0.tgz",
-      "integrity": "sha512-0y1bfG2ho7mty+SiILVf9PfuRA49ek4Nc60Wmmu62QlobNR+CeXa4xXIJgcuwSQgZiWaPH+5BDsctpIW0PR/wQ==",
+      "version": "8.28.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-8.28.0.tgz",
+      "integrity": "sha512-S27Di+EVyMxcHiwDrFzk8dJYAaD+/5SoWKxL1ri/71CRHsnJnRDPNt2Kzj24+MT9FDupf4aqqyqPrvI8MvQ4VQ==",
      "dev": true,
      "dependencies": {
        "@eslint/eslintrc": "^1.3.3",
@ -2201,9 +2204,9 @@
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    },
    "node_modules/globals": {
-      "version": "13.17.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-13.17.0.tgz",
-      "integrity": "sha512-1C+6nQRb1GwGMKm2dH/E7enFAMxGTmGI7/dEdhy/DNelv85w9B72t3uc5frtMNXIbzrarJJ/lTCjcaZwbLJmyw==",
+      "version": "13.18.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-13.18.0.tgz",
+      "integrity": "sha512-/mR4KI8Ps2spmoc0Ulu9L7agOF0du1CZNQ3dke8yItYlyKNmGrkONemBbd6V8UTc1Wgcqn21t3WYB7dbRmh6/A==",
      "dev": true,
      "dependencies": {
        "type-fest": "^0.20.2"
@ -2439,7 +2442,6 @@
      "version": "0.6.3",
      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
-      "dev": true,
      "dependencies": {
        "safer-buffer": ">= 2.1.2 < 3.0.0"
      },
@ -2467,9 +2469,9 @@
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    },
    "node_modules/ignore": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.0.tgz",
-      "integrity": "sha512-CmxgYGiEPCLhfLnpPp1MoRmifwEIOgjcHXxOBjv7mY96c+eWScsOP9c112ZyLdWHi0FxHjI+4uVhKYp/gcdRmQ==",
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.2.1.tgz",
+      "integrity": "sha512-d2qQLzTJ9WxQftPAuEQpSPmKqzxePjzVbpAVv62AQ64NTL+wR4JkrVqR/LqFsFEUsHDAiId52mJteHDFuDkElA==",
      "dev": true,
      "engines": {
        "node": ">= 4"
@ -2639,10 +2641,14 @@
      "integrity": "sha512-opJeO4nCucVnsjiXOE+/PcCgYw9Gwpvs/a6B1LL/lQhwWwpbVEVYDZ1FokFr8PRc7ghYlrFPuyHuiiDNTQxmcw=="
    },
    "node_modules/js-sdsl": {
-      "version": "4.1.5",
-      "resolved": "https://registry.npmjs.org/js-sdsl/-/js-sdsl-4.1.5.tgz",
-      "integrity": "sha512-08bOAKweV2NUC1wqTtf3qZlnpOX/R2DU9ikpjOHs0H+ibQv3zpncVQg6um4uYtRtrwIX8M4Nh3ytK4HGlYAq7Q==",
-      "dev": true
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/js-sdsl/-/js-sdsl-4.2.0.tgz",
+      "integrity": "sha512-dyBIzQBDkCqCu+0upx25Y2jGdbTGxE9fshMsCdK0ViOongpV+n5tXRcZY9v7CaVQ79AGS9KA1KHtojxiM7aXSQ==",
+      "dev": true,
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/js-sdsl"
+      }
    },
    "node_modules/js-yaml": {
      "version": "4.1.0",
@ -2737,9 +2743,9 @@
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    },
    "node_modules/keyv": {
-      "version": "4.5.1",
-      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.1.tgz",
-      "integrity": "sha512-DONNzZ8b9FLIRIX8kF+JByejgBoGUD4msUvRlHnPMqTb49MwW3thKgB6yGsshzOLW0Bol6SGu5TysvSsM6apdA==",
+      "version": "4.5.2",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.2.tgz",
+      "integrity": "sha512-5MHbFaKn8cNSmVW7BYnijeAVlE4cYA/SVkifVgrh7yotnfhKmjuXpDKjrABLnT0SfHWV21P8ow07OGfRrNDg8g==",
      "dependencies": {
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      }
@ -2914,9 +2920,9 @@
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    "node_modules/minipass": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.4.tgz",
-      "integrity": "sha512-I9WPbWHCGu8W+6k1ZiGpPu0GkoKBeorkfKNuAFBNS1HNFJvke82sxvI5bzcCNpWPorkOO5QQ+zomzzwRxejXiw==",
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
+      "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
      "dev": true,
      "dependencies": {
        "yallist": "^4.0.0"
@ -2973,6 +2979,17 @@
      "dev": true,
      "optional": true
    },
+    "node_modules/node-disk-info": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/node-disk-info/-/node-disk-info-1.3.0.tgz",
+      "integrity": "sha512-NEx858vJZ0AoBtmD/ChBIHLjFTF28xCsDIgmFl4jtGKsvlUx9DU/OrMDjvj3qp/E4hzLN0HvTg7eJx5XFQvbeg==",
+      "dependencies": {
+        "iconv-lite": "^0.6.2"
+      },
+      "engines": {
+        "node": ">= 12"
+      }
+    },
    "node_modules/node-fetch": {
      "version": "2.6.7",
      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
@ -3595,9 +3612,9 @@
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    "node_modules/simple-update-notifier": {
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-      "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-1.0.7.tgz",
-      "integrity": "sha512-BBKgR84BJQJm6WjWFMHgLVuo61FBDSj1z/xSFUIozqO6wO7ii0JxCqlIud7Enr/+LhlbNI0whErq96P2qHNWew==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-1.1.0.tgz",
+      "integrity": "sha512-VpsrsJSUcJEseSbMHkrsrAVSdvVS5I96Qo1QAQ4FxQ9wXFcB+pjj7FB7/us9+GcgfW4ziHtYMc1J0PLczb55mg==",
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@ -4559,14 +4576,14 @@
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    "@types/cacheable-request": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.2.tgz",
-      "integrity": "sha512-B3xVo+dlKM6nnKTcmm5ZtY/OL8bOAOd2Olee9M1zft65ox50OzjEHW91sDiU9j6cvW8Ejg1/Qkf4xd2kugApUA==",
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.3.tgz",
+      "integrity": "sha512-IQ3EbTzGxIigb1I3qPZc1rWJnH0BmSKv5QYTalEwweFvyBDLSAe24zP0le/hyi7ecGfZVlIVAg4BZqb8WBwKqw==",
      "requires": {
        "@types/http-cache-semantics": "*",
-        "@types/keyv": "*",
+        "@types/keyv": "^3.1.4",
        "@types/node": "*",
-        "@types/responselike": "*"
+        "@types/responselike": "^1.0.0"
      }
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    "@types/debug": {
@ -4604,11 +4621,11 @@
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-      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-4.2.0.tgz",
-      "integrity": "sha512-xoBtGl5R9jeKUhc8ZqeYaRDx04qqJ10yhhXYGmJ4Jr8qKpvMsDQQrNUvF/wUJ4klOtmJeJM+p2Xo3zp9uaC3tw==",
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+      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-3.1.4.tgz",
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      "requires": {
-        "keyv": "*"
+        "@types/node": "*"
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    "@types/minimatch": {
@ -4661,9 +4678,9 @@
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-      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.13.tgz",
-      "integrity": "sha512-9sWaruZk2JGxIQU+IhI1fhPYRcQ0UuTNuKuCW9bR5fp7qi2Llf7WDzNa17Cy7TKnh3cdxDOiyTu6gaLS0eDatg==",
+      "version": "17.0.14",
+      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.14.tgz",
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@ -5051,9 +5068,9 @@
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-      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.5.0.tgz",
-      "integrity": "sha512-yH4RezKOGlOhxkmhbeNuC4eYZKAUsEaGtBuBzDDP1eFUKiccDWzBABxBfOx31IDwDIXMTxWuwAxUGModvkbuVw==",
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.7.0.tgz",
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@ -5397,9 +5414,9 @@
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-      "resolved": "https://registry.npmjs.org/electron/-/electron-21.2.2.tgz",
-      "integrity": "sha512-Q0j1tzLTM5JRjSJVAfDSONZgdtuyruHR1pc1y2IbMYQz62pVJWVWAvcJXzpty5iRh2HKzW9+B9WVlmfWNFA8ag==",
+      "version": "21.3.1",
+      "resolved": "https://registry.npmjs.org/electron/-/electron-21.3.1.tgz",
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@ -5546,9 +5563,9 @@
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@ -5931,9 +5948,9 @@
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@ -6107,7 +6124,6 @@
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@ -6118,9 +6134,9 @@
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    "js-sdsl": {
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+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/js-sdsl/-/js-sdsl-4.2.0.tgz",
+      "integrity": "sha512-dyBIzQBDkCqCu+0upx25Y2jGdbTGxE9fshMsCdK0ViOongpV+n5tXRcZY9v7CaVQ79AGS9KA1KHtojxiM7aXSQ==",
      "dev": true
    },
    "js-yaml": {
@ -6328,9 +6344,9 @@
      }
    },
    "keyv": {
-      "version": "4.5.1",
-      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.1.tgz",
-      "integrity": "sha512-DONNzZ8b9FLIRIX8kF+JByejgBoGUD4msUvRlHnPMqTb49MwW3thKgB6yGsshzOLW0Bol6SGu5TysvSsM6apdA==",
+      "version": "4.5.2",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.2.tgz",
+      "integrity": "sha512-5MHbFaKn8cNSmVW7BYnijeAVlE4cYA/SVkifVgrh7yotnfhKmjuXpDKjrABLnT0SfHWV21P8ow07OGfRrNDg8g==",
      "requires": {
        "json-buffer": "3.0.1"
      }
@ -6463,9 +6479,9 @@
      "dev": true
    },
    "minipass": {
-      "version": "3.3.4",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.4.tgz",
-      "integrity": "sha512-I9WPbWHCGu8W+6k1ZiGpPu0GkoKBeorkfKNuAFBNS1HNFJvke82sxvI5bzcCNpWPorkOO5QQ+zomzzwRxejXiw==",
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
+      "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
      "dev": true,
      "requires": {
        "yallist": "^4.0.0"
@ -6510,6 +6526,14 @@
      "dev": true,
      "optional": true
    },
+    "node-disk-info": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/node-disk-info/-/node-disk-info-1.3.0.tgz",
+      "integrity": "sha512-NEx858vJZ0AoBtmD/ChBIHLjFTF28xCsDIgmFl4jtGKsvlUx9DU/OrMDjvj3qp/E4hzLN0HvTg7eJx5XFQvbeg==",
+      "requires": {
+        "iconv-lite": "^0.6.2"
+      }
+    },
    "node-fetch": {
      "version": "2.6.7",
      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
@ -6936,9 +6960,9 @@
      }
    },
    "simple-update-notifier": {
-      "version": "1.0.7",
-      "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-1.0.7.tgz",
-      "integrity": "sha512-BBKgR84BJQJm6WjWFMHgLVuo61FBDSj1z/xSFUIozqO6wO7ii0JxCqlIud7Enr/+LhlbNI0whErq96P2qHNWew==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/simple-update-notifier/-/simple-update-notifier-1.1.0.tgz",
+      "integrity": "sha512-VpsrsJSUcJEseSbMHkrsrAVSdvVS5I96Qo1QAQ4FxQ9wXFcB+pjj7FB7/us9+GcgfW4ziHtYMc1J0PLczb55mg==",
      "dev": true,
      "requires": {
        "semver": "~7.0.0"
--- a/package.json
+++ b/package.json
@ -35,6 +35,7 @@
    "got": "^11.8.5",
    "helios-core": "~0.1.2",
    "jquery": "^3.6.1",
+    "node-disk-info": "^1.3.0",
    "node-stream-zip": "^1.15.0",
    "request": "^2.88.2",
    "semver": "^7.3.8",
@ -42,9 +43,9 @@
    "winreg": "^1.2.4"
  },
  "devDependencies": {
-    "electron": "^21.2.2",
+    "electron": "^21.3.1",
    "electron-builder": "^23.6.0",
-    "eslint": "^8.27.0"
+    "eslint": "^8.28.0"
  },
  "repository": {
    "type": "git",