44 lines
1.5 KiB
Java
44 lines
1.5 KiB
Java
public final class JavaInfo {
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private static final String[] CHECKED_PROPERTIES = new String[] {"os.arch", "java.version", "java.vendor", "java.home"};
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public static void main(String[] args) {
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int returnCode = 0;
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for (String key : CHECKED_PROPERTIES) {
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String property = System.getProperty(key);
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if (property != null) {
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System.out.println(key + "=" + property);
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} else {
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returnCode = 1;
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}
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}
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// Minecraft needs AWT. Stripped, headless and hand-jlinked images drop
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// java.desktop and only blow up once the game reaches for it.
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System.out.println("java.awt=" + hasClass("java.awt.Toolkit"));
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// A kit ships a compiler, a runtime image does not. On 8 this finds the
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// one in tools.jar, on 9+ the jdk.compiler module.
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System.out.println("java.jdk=" + hasCompiler());
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System.exit(returnCode);
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}
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/** Loads the class without initialising it, so no display is ever needed. */
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private static boolean hasClass(String name) {
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try {
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Class.forName(name, false, JavaInfo.class.getClassLoader());
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return true;
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} catch (Throwable ignored) {
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return false;
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}
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}
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private static boolean hasCompiler() {
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try {
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return javax.tools.ToolProvider.getSystemJavaCompiler() != null;
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} catch (Throwable ignored) {
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return false;
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}
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}
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}
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