First commit

lwjgl3/build.gradle

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+
+buildscript {
+  repositories {
+    gradlePluginPortal()
+  }
+  dependencies {
+    classpath "io.github.fourlastor:construo:2.1.0"
+    if(enableGraalNative == 'true') {
+      classpath "org.graalvm.buildtools.native:org.graalvm.buildtools.native.gradle.plugin:0.9.28"
+    }
+  }
+}
+plugins {
+  id "application"
+}
+apply plugin: 'io.github.fourlastor.construo'
+
+
+import io.github.fourlastor.construo.Target
+
+sourceSets.main.resources.srcDirs += [ rootProject.file('assets').path ]
+application.mainClass = 'io.github.eldek0.lwjgl3.Lwjgl3Launcher'
+application.applicationName = appName
+eclipse.project.name = appName + '-lwjgl3'
+java.sourceCompatibility = 21
+java.targetCompatibility = 21
+if (JavaVersion.current().isJava9Compatible()) {
+        compileJava.options.release.set(21)
+}
+
+dependencies {
+  implementation "com.badlogicgames.gdx:gdx-backend-lwjgl3:$gdxVersion"
+  implementation "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop"
+  implementation project(':core')
+
+  if(enableGraalNative == 'true') {
+    implementation "io.github.berstanio:gdx-svmhelper-backend-lwjgl3:$graalHelperVersion"
+
+    }
+}
+
+def os = System.properties['os.name'].toLowerCase(Locale.ROOT)
+
+run {
+  workingDir = rootProject.file('assets').path
+// You can uncomment the next line if your IDE claims a build failure even when the app closed properly.
+  //setIgnoreExitValue(true)
+
+  if (os.contains('mac')) jvmArgs += "-XstartOnFirstThread"
+}
+
+jar {
+// sets the name of the .jar file this produces to the name of the game or app, with the version after.
+  archiveFileName.set("${appName}-${projectVersion}.jar")
+// the duplicatesStrategy matters starting in Gradle 7.0; this setting works.
+  duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+  dependsOn configurations.runtimeClasspath
+  from { configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) } }
+// these "exclude" lines remove some unnecessary duplicate files in the output JAR.
+  exclude('META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    exclude('META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+// setting the manifest makes the JAR runnable.
+// enabling native access helps avoid a warning when Java 24 or later runs the JAR.
+// setting Multi-Release to true allows LWJGL3 to use different classes on recent Java versions.
+  manifest {
+    attributes 'Main-Class': application.mainClass, 'Enable-Native-Access': 'ALL-UNNAMED', 'Multi-Release': 'true'
+  }
+// this last step may help on some OSes that need extra instruction to make runnable JARs.
+  doLast {
+    file(archiveFile).setExecutable(true, false)
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on macOS, not Windows or Linux.
+// The file size for a Mac-only JAR is about 7MB smaller than a cross-platform JAR.
+tasks.register("jarMac") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-mac.jar")
+  jar.exclude("windows/x86/**", "windows/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**", "**/*.dll", "**/*.so",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("windows/x86/**", "windows/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on Linux, not Windows or macOS.
+// The file size for a Linux-only JAR is about 5MB smaller than a cross-platform JAR.
+tasks.register("jarLinux") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-linux.jar")
+  jar.exclude("windows/x86/**", "windows/x64/**", "macos/arm64/**", "macos/x64/**", "**/*.dll", "**/*.dylib",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("windows/x86/**", "windows/x64/**", "macos/arm64/**", "macos/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on Windows, not Linux or macOS.
+// The file size for a Windows-only JAR is about 6MB smaller than a cross-platform JAR.
+tasks.register("jarWin") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-win.jar")
+  jar.exclude("macos/arm64/**", "macos/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**", "**/*.dylib", "**/*.so",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("macos/arm64/**", "macos/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+construo {
+  // name of the executable
+  name.set(appName)
+  // human-readable name, used for example in the `.app` name for macOS
+  humanName.set(appName)
+  jlink {
+    guessModulesFromJar.set(false)
+    // You may need to add more modules, as needed.
+    modules.addAll("java.base", "java.management", "java.desktop", "jdk.unsupported")
+  }
+
+  targets.configure {
+    register("linuxX64", Target.Linux) {
+      architecture.set(Target.Architecture.X86_64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_linux_hotspot_21.0.10_7.tar.gz")
+      // Linux does not currently have a way to set the icon on the executable
+    }
+    register("macM1", Target.MacOs) {
+      architecture.set(Target.Architecture.AARCH64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_aarch64_mac_hotspot_21.0.10_7.tar.gz")
+      // macOS needs an identifier
+      identifier.set("io.github.eldek0." + appName)
+      // Optional: icon for macOS, as an ICNS file
+      macIcon.set(project.file("icons/logo.icns"))
+    }
+    register("macX64", Target.MacOs) {
+      architecture.set(Target.Architecture.X86_64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_mac_hotspot_21.0.10_7.tar.gz")
+      // macOS needs an identifier
+      identifier.set("io.github.eldek0." + appName)
+      // Optional: icon for macOS, as an ICNS file
+      macIcon.set(project.file("icons/logo.icns"))
+    }
+    register("winX64", Target.Windows) {
+      architecture.set(Target.Architecture.X86_64)
+      // Optional: icon for Windows, as a PNG
+      icon.set(project.file("icons/logo.png"))
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_windows_hotspot_21.0.10_7.zip")
+      // Uncomment the next line to show a console when the game runs, to print messages.
+      //useConsole.set(true)
+    }
+  }
+}
+
+// Equivalent to the jar task; here for compatibility with gdx-setup.
+tasks.register('dist') {
+  dependsOn 'jar'
+}
+
+distributions {
+  main {
+    contents {
+      into('libs') {
+        project.configurations.runtimeClasspath.files.findAll { file ->
+          file.getName() != project.tasks.jar.outputs.files.singleFile.name
+        }.each { file ->
+          exclude file.name
+        }
+      }
+    }
+  }
+}
+
+startScripts.dependsOn(':lwjgl3:jar')
+startScripts.classpath = project.tasks.jar.outputs.files
+
+if(enableGraalNative == 'true') {
+  apply from: file("nativeimage.gradle")
+}

lwjgl3/nativeimage.gradle

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+
+project(":lwjgl3") {
+  apply plugin: "org.graalvm.buildtools.native"
+
+  graalvmNative {
+    binaries {
+      main {
+        imageName = appName
+        mainClass = application.mainClass
+        requiredVersion = '23.0'
+        buildArgs.add("-march=compatibility")
+        jvmArgs.addAll("-Dfile.encoding=UTF8")
+        sharedLibrary = false
+        resources.autodetect()
+      }
+    }
+  }
+
+  run {
+    doNotTrackState("Running the app should not be affected by Graal.")
+  }
+
+  // Modified from https://lyze.dev/2021/04/29/libGDX-Internal-Assets-List/ ; thanks again, Lyze!
+  // This creates a resource-config.json file based on the contents of the assets folder (and the libGDX icons).
+  // This file is used by Graal Native to embed those specific files.
+  // This has to run before nativeCompile, so it runs at the start of an unrelated resource-handling command.
+  generateResourcesConfigFile.doFirst {
+    def assetsFolder = new File("${project.rootDir}/assets/")
+    def lwjgl3 = project(':lwjgl3')
+    def resFolder = new File("${lwjgl3.projectDir}/src/main/resources/META-INF/native-image/${lwjgl3.ext.appName}")
+    resFolder.mkdirs()
+    def resFile = new File(resFolder, "resource-config.json")
+    resFile.delete()
+    resFile.append(
+            """{
+  "resources":{
+  "includes":[
+    {
+      "pattern": ".*(""")
+    // This adds every filename in the assets/ folder to a pattern that adds those files as resources.
+    fileTree(assetsFolder).each {
+      // The backslash-Q and backslash-E escape the start and end of a literal string, respectively.
+      resFile.append("\\\\Q${it.name}\\\\E|")
+    }
+    // We also match all of the window icon images this way and the font files that are part of libGDX.
+    resFile.append(
+            """libgdx.+\\\\.png|lsans.+)"
+    }
+  ]},
+  "bundles":[]
+}"""
+    )
+  }
+}

lwjgl3/src/main/java/io/github/eldek0/lwjgl3/Lwjgl3Launcher.java

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+package io.github.eldek0.lwjgl3;
+
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import io.github.eldek0.App;
+
+/** Launches the desktop (LWJGL3) application. */
+public class Lwjgl3Launcher {
+    public static void main(String[] args) {
+        if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows.
+        createApplication();
+    }
+
+    private static Lwjgl3Application createApplication() {
+        return new Lwjgl3Application(new App(), getDefaultConfiguration());
+    }
+
+    private static Lwjgl3ApplicationConfiguration getDefaultConfiguration() {
+        Lwjgl3ApplicationConfiguration configuration = new Lwjgl3ApplicationConfiguration();
+        configuration.setTitle("fnafinjava");
+        //// Vsync limits the frames per second to what your hardware can display, and helps eliminate
+        //// screen tearing. This setting doesn't always work on Linux, so the line after is a safeguard.
+        configuration.useVsync(true);
+        //// Limits FPS to the refresh rate of the currently active monitor, plus 1 to try to match fractional
+        //// refresh rates. The Vsync setting above should limit the actual FPS to match the monitor.
+        configuration.setForegroundFPS(Lwjgl3ApplicationConfiguration.getDisplayMode().refreshRate + 1);
+        //// If you remove the above line and set Vsync to false, you can get unlimited FPS, which can be
+        //// useful for testing performance, but can also be very stressful to some hardware.
+        //// You may also need to configure GPU drivers to fully disable Vsync; this can cause screen tearing.
+
+        configuration.setWindowedMode(App.SCREEN_WIDTH, App.SCREEN_HEIGHT);
+        //// You can change these files; they are in lwjgl3/src/main/resources/ .
+        //// They can also be loaded from the root of assets/ .
+        configuration.setWindowIcon("libgdx128.png", "libgdx64.png", "libgdx32.png", "libgdx16.png");
+
+        //// This could improve compatibility with Windows machines with buggy OpenGL drivers, Macs
+        //// with Apple Silicon that have to emulate compatibility with OpenGL anyway, and more.
+        //// This uses the dependency `com.badlogicgames.gdx:gdx-lwjgl3-angle` to function.
+        //// You would need to add this line to lwjgl3/build.gradle , below the dependency on `gdx-backend-lwjgl3`:
+        ////     implementation "com.badlogicgames.gdx:gdx-lwjgl3-angle:$gdxVersion"
+        //// You can choose to add the following line and the mentioned dependency if you want; they
+        //// are not intended for games that use GL30 (which is compatibility with OpenGL ES 3.0).
+        //// Know that it might not work well in some cases.
+//        configuration.setOpenGLEmulation(Lwjgl3ApplicationConfiguration.GLEmulation.ANGLE_GLES20, 0, 0);
+
+        return configuration;
+    }
+}

lwjgl3/src/main/java/io/github/eldek0/lwjgl3/StartupHelper.java

@@ -0,0 +1,227 @@
+/*
+ * Copyright 2020 damios
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Note, the above license and copyright applies to this file only.
+package io.github.eldek0.lwjgl3;
+
+import com.badlogic.gdx.Version;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3NativesLoader;
+
+import org.lwjgl.system.JNI;
+import org.lwjgl.system.linux.UNISTD;
+import org.lwjgl.system.macosx.LibC;
+import org.lwjgl.system.macosx.ObjCRuntime;
+
+import java.io.File;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * A helper object for game startup, featuring three utilities related to LWJGL3 on various operating systems.
+ * <p>
+ * The utilities are as follows:
+ * <ul>
+ *  <li> Windows: Prevents a common crash related to LWJGL3's extraction of shared library files.</li>
+ *  <li> macOS: Spawns a child JVM process with {@code -XstartOnFirstThread} in the JVM args (if it was not already).
+ *  This is required for LWJGL3 to work on macOS.</li>
+ *  <li> Linux (NVIDIA GPUs only): Spawns a child JVM process with the {@code __GL_THREADED_OPTIMIZATIONS}
+ *  {@link System#getenv(String) Environment Variable} set to {@code 0} (if it was not already). This is required for
+ *  LWJGL3 to work on Linux with NVIDIA GPUs.</li>
+ * </ul>
+ * <a href="https://jvm-gaming.org/t/starting-jvm-on-mac-with-xstartonfirstthread-programmatically/57547">Based on this java-gaming.org post by kappa</a>
+ * @author damios
+ */
+public class StartupHelper {
+
+	private StartupHelper() {}
+
+	private static final String JVM_RESTARTED_ARG = "jvmIsRestarted";
+
+	/**
+	 * Must only be called on Linux. Check OS first (or use short-circuit evaluation)!
+	 * @return whether NVIDIA drivers are present on Linux.
+	 */
+	public static boolean isLinuxNvidia() {
+		String[] drivers = new File("/proc/driver").list(
+			(dir, path) -> path.toUpperCase(Locale.ROOT).contains("NVIDIA")
+		);
+		if (drivers == null) return false;
+		return drivers.length > 0;
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 * 	 if (StartupHelper.startNewJvmIfRequired()) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired() {
+		return startNewJvmIfRequired(true);
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 *   // The parameter on the next line could instead be false if you don't want to inherit IO.
+	 * 	 if (StartupHelper.startNewJvmIfRequired(true)) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                  block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired(boolean inheritIO) {
+		String osName = System.getProperty("os.name").toLowerCase(Locale.ROOT);
+		if (osName.contains("mac")) return startNewJvm0(/*isMac =*/ true, inheritIO);
+		if (osName.contains("windows")) {
+			// Here, we are trying to work around an issue with how LWJGL3 loads its extracted .dll files.
+			// By default, LWJGL3 extracts to the directory specified by "java.io.tmpdir": usually, the user's home.
+			// If the user's name has non-ASCII (or some non-alphanumeric) characters in it, that would fail.
+			// By extracting to the relevant "ProgramData" folder, which is usually "C:\ProgramData", we avoid this.
+			// We also temporarily change the "user.name" property to one without any chars that would be invalid.
+			// We revert our changes immediately after loading LWJGL3 natives.
+			String programData = System.getenv("ProgramData");
+			if (programData == null) programData = "C:\\Temp"; // if ProgramData isn't set, try some fallback.
+			String prevTmpDir = System.getProperty("java.io.tmpdir", programData);
+			String prevUser = System.getProperty("user.name", "libGDX_User");
+			System.setProperty("java.io.tmpdir", programData + "\\libGDX-temp");
+			System.setProperty(
+				"user.name",
+				("User_" + prevUser.hashCode() + "_GDX" + Version.VERSION).replace('.', '_')
+			);
+			Lwjgl3NativesLoader.load();
+			System.setProperty("java.io.tmpdir", prevTmpDir);
+			System.setProperty("user.name", prevUser);
+			return false;
+		}
+		return startNewJvm0(/*isMac =*/ false, inheritIO);
+	}
+
+	private static final String MAC_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the '-XstartOnFirstThread' argument manually!";
+	private static final String LINUX_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the environment variable '__GL_THREADED_OPTIMIZATIONS' to '0'!";
+	private static final String CHILD_LOOP_ERR_MSG = "The current JVM process is a spawned child JVM process, but StartupHelper has attempted to spawn another child JVM process! This is a broken state, and should not normally happen! Your game may crash or not function properly!";
+
+	/**
+	 * Spawns a child JVM process if on macOS, or on Linux with NVIDIA drivers.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * @param isMac whether the current OS is macOS. If this is `false` then the current OS is assumed to be Linux (and
+	 *             an immediate check for NVIDIA drivers is performed).
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                 block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvm0(boolean isMac, boolean inheritIO) {
+		long processID = getProcessID(isMac);
+		if (!isMac) {
+			// No need to restart non-NVIDIA Linux
+			if (!isLinuxNvidia()) return false;
+			// check whether __GL_THREADED_OPTIMIZATIONS is already disabled
+			if ("0".equals(System.getenv("__GL_THREADED_OPTIMIZATIONS"))) return false;
+		} else {
+			// There is no need for -XstartOnFirstThread on Graal native image
+			if (!System.getProperty("org.graalvm.nativeimage.imagecode", "").isEmpty()) return false;
+
+			// Checks if we are already on the main thread, such as from running via Construo.
+			long objcMsgSend = ObjCRuntime.getLibrary().getFunctionAddress("objc_msgSend");
+			long nsThread = ObjCRuntime.objc_getClass("NSThread");
+			long currentThread = JNI.invokePPP(nsThread, ObjCRuntime.sel_getUid("currentThread"), objcMsgSend);
+			boolean isMainThread = JNI.invokePPZ(currentThread, ObjCRuntime.sel_getUid("isMainThread"), objcMsgSend);
+			if (isMainThread) return false;
+
+			if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + processID))) return false;
+		}
+
+		// Check whether this JVM process is a child JVM process already.
+		// This state shouldn't usually be reachable, but this stops us from endlessly spawning new child JVM processes.
+		if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) {
+			System.err.println(CHILD_LOOP_ERR_MSG);
+			return false;
+		}
+
+		// Spawn the child JVM process with updated environment variables or JVM args
+		List<String> jvmArgs = new ArrayList<>();
+		// The following line is used assuming you target Java 8, the minimum for LWJGL3.
+		String javaExecPath = System.getProperty("java.home") + "/bin/java";
+		// If targeting Java 9 or higher, you could use the following instead of the above line:
+		//String javaExecPath = ProcessHandle.current().info().command().orElseThrow()
+		if (!(new File(javaExecPath).exists())) {
+			System.err.println(getJreErrMsg(isMac));
+			return false;
+		}
+
+		jvmArgs.add(javaExecPath);
+		if (isMac) jvmArgs.add("-XstartOnFirstThread");
+		jvmArgs.add("-D" + JVM_RESTARTED_ARG + "=true");
+		jvmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
+		jvmArgs.add("-cp");
+		jvmArgs.add(System.getProperty("java.class.path"));
+		String mainClass = System.getenv("JAVA_MAIN_CLASS_" + processID);
+		if (mainClass == null) {
+			StackTraceElement[] trace = Thread.currentThread().getStackTrace();
+			if (trace.length > 0) mainClass = trace[trace.length - 1].getClassName();
+			else {
+				System.err.println("The main class could not be determined.");
+				return false;
+			}
+		}
+		jvmArgs.add(mainClass);
+
+		try {
+			ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs);
+			if (!isMac) processBuilder.environment().put("__GL_THREADED_OPTIMIZATIONS", "0");
+
+			if (!inheritIO) processBuilder.start();
+			else processBuilder.inheritIO().start().waitFor();
+		} catch (Exception e) {
+			System.err.println("There was a problem restarting the JVM.");
+			// noinspection CallToPrintStackTrace
+			e.printStackTrace();
+		}
+
+		return true;
+	}
+
+	private static String getJreErrMsg(boolean isMac) {
+		if (isMac) return MAC_JRE_ERR_MSG;
+		else return LINUX_JRE_ERR_MSG;
+	}
+
+	private static long getProcessID(boolean isMac) {
+		if (isMac) return LibC.getpid();
+		else return UNISTD.getpid();
+	}
+}