--- /dev/null 2015-11-24 12:24:09.000000000 -0800 +++ new/jdk/test/java/lang/StackWalker/CallerFromMain.java 2015-11-24 12:24:09.000000000 -0800 @@ -0,0 +1,138 @@ +/* + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * @test + * @bug 8140450 + * @library /lib/testlibrary + * @build jdk.testlibrary.* + * @summary Test if the getCallerClass method returns empty optional + * @run main CallerFromMain exec + */ + +import jdk.testlibrary.ProcessTools; +import jdk.testlibrary.OutputAnalyzer; + +public class CallerFromMain { + + private static final StackWalker sw = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE); + public static void main(String[] args) throws Exception { + if (args.length > 0) { + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(true, "CallerFromMain"); + OutputAnalyzer output = ProcessTools.executeProcess(pb); + System.out.println(output.getOutput()); + output.shouldHaveExitValue(0); + return; + } + + // StackWalker::getCallerClass + // CallerFromMain::main + // no caller + try { + Class c = sw.getCallerClass(); + throw new RuntimeException("UOE not thrown. Caller: " + c); + } catch (IllegalStateException e) {} + + // StackWalker::getCallerClass + // Runnable::run + // Thread::run + Thread t1 = new Thread(new Runnable() { + @Override + public void run() { + Class c = sw.getCallerClass(); + System.out.println("Call from Thread.run: " + c); + assertThreadClassAsCaller(c); + } + }); + t1.setDaemon(true); + t1.start(); + + // StackWalker::getCallerClass + // CallerFromMain::doit + // Thread::run + Thread t2 = new Thread(CallerFromMain::doit); + t2.setDaemon(true); + t2.start(); + + // StackWalker::getCallerClass + // MyRunnable::run + // Thread::run + Thread t3 = new Thread(new MyRunnable()); + t3.setDaemon(true); + t3.start(); + + // StackWalker::getCallerClass + // Runnable::run + // MyThread::run + Thread t4 = new MyThread(new Runnable() { + @Override + public void run() { + Class c = sw.getCallerClass(); + System.out.println("Call from MyThread.run: " + c); + if (c != MyThread.class) { + throw new RuntimeException("Expected MyThread.class but got " + c); + } + } + }); + t4.setDaemon(true); + t4.start(); + + t1.join(); + t2.join(); + t3.join(); + t4.join(); + } + + static class MyThread extends Thread { + final Runnable runnable; + MyThread(Runnable runnable) { + super("MyThread"); + this.runnable = runnable; + } + public void run() { + runnable.run(); + } + } + + static class MyRunnable implements Runnable { + @Override + public void run() { + Class c = sw.getCallerClass(); + System.out.println("Call from Thread::run: " + c); + assertThreadClassAsCaller(c); + } + } + + static void doit() { + Class c = sw.getCallerClass(); + System.out.println("Call from CallerFromMain.doit: " + c); + assertThreadClassAsCaller(c); + } + + static void assertThreadClassAsCaller(Class caller) { + if (caller != Thread.class) { + throw new RuntimeException("Expected Thread.class but got " + caller); + } + } +} +