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core/src/com/ray3k/skincomposer/desktop/StartupHelper.java
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| /* | ||
| * 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: | ||
| * http://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. | ||
|
|
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| package com.ray3k.skincomposer.desktop; | ||
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| import org.lwjgl.system.macosx.LibC; | ||
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| import java.io.BufferedReader; | ||
| import java.io.File; | ||
| import java.io.InputStreamReader; | ||
| import java.lang.management.ManagementFactory; | ||
| import java.util.ArrayList; | ||
|
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| /** | ||
| * Adds some utilities to ensure that the JVM was started with the | ||
| * {@code -XstartOnFirstThread} argument, which is required on macOS for LWJGL 3 | ||
| * to function. Also helps on Windows when users have names with characters from | ||
| * outside the Latin alphabet, a common cause of startup crashes. | ||
| * <br> | ||
| * <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 { | ||
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| private static final String JVM_RESTARTED_ARG = "jvmIsRestarted"; | ||
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| private StartupHelper() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| /** | ||
| * Starts a new JVM if the application was started on macOS without the | ||
| * {@code -XstartOnFirstThread} argument. This also includes some code for | ||
| * Windows, for the case where the user's home directory includes certain | ||
| * non-Latin-alphabet characters (without this code, most LWJGL3 apps fail | ||
| * immediately for those users). Returns whether a new JVM was started and | ||
| * thus no code should be executed. | ||
| * <p> | ||
| * <u>Usage:</u> | ||
| * | ||
| * <pre><code> | ||
| * public static void main(String... args) { | ||
| * if (StartupHelper.startNewJvmIfRequired(true)) return; // This handles macOS support and helps on Windows. | ||
| * // after this is the actual main method code | ||
| * } | ||
| * </code></pre> | ||
| * | ||
| * @param redirectOutput | ||
| * whether the output of the new JVM should be rerouted to the | ||
| * old JVM, so it can be accessed in the same place; keeps the | ||
| * old JVM running if enabled | ||
| * @return whether a new JVM was started and thus no code should be executed | ||
| * in this one | ||
| */ | ||
| public static boolean startNewJvmIfRequired(boolean redirectOutput) { | ||
| String osName = System.getProperty("os.name").toLowerCase(); | ||
| if (!osName.contains("mac")) { | ||
| 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", which is 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. | ||
| System.setProperty("java.io.tmpdir", System.getenv("ProgramData") + "/libGDX-temp"); | ||
| } | ||
| return false; | ||
| } | ||
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| // There is no need for -XstartOnFirstThread on Graal native image | ||
| if (!System.getProperty("org.graalvm.nativeimage.imagecode", "").isEmpty()) { | ||
| return false; | ||
| } | ||
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| long pid = LibC.getpid(); | ||
|
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| // check whether -XstartOnFirstThread is enabled | ||
| if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + pid))) { | ||
| return false; | ||
| } | ||
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| // check whether the JVM was previously restarted | ||
| // avoids looping, but most certainly leads to a crash | ||
| if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) { | ||
| System.err.println( | ||
| "There was a problem evaluating whether the JVM was started with the -XstartOnFirstThread argument."); | ||
| return false; | ||
| } | ||
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| // Restart the JVM with -XstartOnFirstThread | ||
| ArrayList<String> jvmArgs = new ArrayList<>(); | ||
| String separator = System.getProperty("file.separator"); | ||
| // The following line is used assuming you target Java 8, the minimum for LWJGL3. | ||
| String javaExecPath = System.getProperty("java.home") + separator + "bin" + separator + "java"; | ||
| // If targeting Java 9 or higher, you could use the following instead of the above line: | ||
| //String javaExecPath = ProcessHandle.current().info().command().orElseThrow(); | ||
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| if (!(new File(javaExecPath)).exists()) { | ||
| System.err.println( | ||
| "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!"); | ||
| return false; | ||
| } | ||
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| jvmArgs.add(javaExecPath); | ||
| 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_" + pid); | ||
| 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); | ||
|
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||
| try { | ||
| if (!redirectOutput) { | ||
| ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs); | ||
| processBuilder.start(); | ||
| } else { | ||
| Process process = (new ProcessBuilder(jvmArgs)) | ||
| .redirectErrorStream(true).start(); | ||
| BufferedReader processOutput = new BufferedReader( | ||
| new InputStreamReader(process.getInputStream())); | ||
| String line; | ||
|
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| while ((line = processOutput.readLine()) != null) { | ||
| System.out.println(line); | ||
| } | ||
|
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| process.waitFor(); | ||
| } | ||
| } catch (Exception e) { | ||
| System.err.println("There was a problem restarting the JVM"); | ||
| e.printStackTrace(); | ||
| } | ||
|
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| return true; | ||
| } | ||
|
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| /** | ||
| * Starts a new JVM if the application was started on macOS without the | ||
| * {@code -XstartOnFirstThread} argument. Returns whether a new JVM was | ||
| * started and thus no code should be executed. Redirects the output of the | ||
| * new JVM to the old one. | ||
| * <p> | ||
| * <u>Usage:</u> | ||
| * | ||
| * <pre> | ||
| * public static void main(String... args) { | ||
| * if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows. | ||
| * // the actual main method code | ||
| * } | ||
| * </pre> | ||
| * | ||
| * @return whether a new JVM was started and thus no code should be executed | ||
| * in this one | ||
| */ | ||
| public static boolean startNewJvmIfRequired() { | ||
| return startNewJvmIfRequired(true); | ||
| } | ||
| } |