[ https://issues.apache.org/jira/browse/JEXL-206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitri Blinov updated JEXL-206: ------------------------------- Description: I'm struggling with strange behaviour of the building process, it seems that time after time the process hangs somewhere in the middle of the tests stage. First I thought it was somehow related to memory problems so I changed fork mode of the test plugin by adding <forkMode>pertest</forkMode> to maven-surefire-plugin configuration. But that helped for a couple of times to cleanly build jexl and run all tests successfully. The other times it simply hanged on test stage. I have managed to detect that it is the testCallableCancel() test that hangs. One of its worker threads has a stack trace as follows: {code} org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:893) org.apache.commons.jexl3.parser.ASTWhileStatement.jjtAccept(ASTWhileStatement.java:18) org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:1119) org.apache.commons.jexl3.parser.ASTJexlScript.jjtAccept(ASTJexlScript.java:55) org.apache.commons.jexl3.internal.Interpreter.interpret(Interpreter.java:210) org.apache.commons.jexl3.internal.Script$Callable.interpret(Script.java:364) org.apache.commons.jexl3.internal.Script$Callable.call(Script.java:372) - locked org.apache.commons.jexl3.internal.Script$Callable@18399f62 java.util.concurrent.FutureTask.run(FutureTask.java:262) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) java.lang.Thread.run(Thread.java:745) {code} I have adjusted the test code with prinln() to dig further what is going on: {code} @Test public void testCallableCancel() throws Exception { System.out.println("testCallableCancel(): started"); JexlScript e = JEXL.createScript("while(true);"); final Script.Callable c = (Script.Callable) e.callable(null); Object t = 42; Callable<Object> kc = new Callable<Object>() { @Override public Object call() throws Exception { System.out.println("testCallableCancel(): cancel() is called"); return c.cancel(); } }; Callable<Object> xkc = new Callable<Object>() { @Override public Object call() throws Exception { System.out.println("testCallableCancel(): run() is called"); return c.call(); } }; ExecutorService executor = Executors.newFixedThreadPool(2); Future<?> future = executor.submit(xkc); Future<?> kfc = executor.submit(kc); try { Assert.assertTrue((Boolean) kfc.get()); System.out.println("testCallableCancel(): canceled()"); t = future.get(); Assert.fail("should have been cancelled"); } catch (ExecutionException xexec) { // ok, ignore Assert.assertTrue(xexec.getCause() instanceof JexlException.Cancel); } finally { executor.shutdown(); } Assert.assertTrue(c.isCancelled()); System.out.println("testCallableCancel(): finished"); } {code} If the test hangs it prints the following: {panel} testCallableCancel(): started testCallableCancel(): run() is called testCallableCancel(): cancel() is called testCallableCancel(): canceled() {panel} If the test runs as normal and does not hang it prints the following: {panel} testCallableCancel(): started testCallableCancel(): run() is called testCallableCancel(): cancel() is called testCallableCancel(): canceled() testCallableCancel(): finished {panel} was: I'm struggling with strange behaviour of the building process, it seems that time after time the process hangs somewhere in the middle of the tests stage. First I thought it was somehow related to memory problems so I changed fork mode of the test plugin by adding <forkMode>pertest</forkMode> to maven-surefire-plugin configuration. But that helped for a couple of times to cleanly build jexl and run all tests successfully. The other times it simply hanged on test stage. I have managed to detect that it is the testCancelLoopWait() test that hangs. It writes to the console the message {panel} WARNING: org.apache.commons.jexl3.ScriptCallableTest.testCancelLoopWait@1:20 execution cancelled {panel} and hangs with its stack trace as follows: {code} org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:893) org.apache.commons.jexl3.parser.ASTWhileStatement.jjtAccept(ASTWhileStatement.java:18) org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:1119) org.apache.commons.jexl3.parser.ASTJexlScript.jjtAccept(ASTJexlScript.java:55) org.apache.commons.jexl3.internal.Interpreter.interpret(Interpreter.java:210) org.apache.commons.jexl3.internal.Script$Callable.interpret(Script.java:364) org.apache.commons.jexl3.internal.Script$Callable.call(Script.java:372) - locked org.apache.commons.jexl3.internal.Script$Callable@18399f62 java.util.concurrent.FutureTask.run(FutureTask.java:262) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) java.lang.Thread.run(Thread.java:745) {code} The problem started manifesting itself right after I had added ScriptInterruptableTest.java (see JEXL-204) but as I understand this test script is completely unrelated to ScriptCallableTest.java so I think it's merely a conicidence. I could not write anything in ScriptInterruptableTest and screw up ScriptCallableTest, right? PS. I have managed to catch this exactly behavior after removing ScriptInterruptableTest.java completely and making clean build, so I'm 100% sure there is something wrong with the original code, may be race condition or something. If the test runs as normal and does not hang it prints the following: {panel} WARNING: org.apache.commons.jexl3.ScriptCallableTest.testCancelLoopWait@1:20 execution cancelled ...12, 2016 3:31:50 PM org.apache.commons.jexl3.JexlEngine invocationFailed {panel} Summary: testCallableCancel() test hangs sporadically (was: testCancelLoopWait() test hangs sporadically?) Sorry for previous misinformation about testCancelLoopWait(), it turned out that was not testCancelLoopWait() that hanged but the one that was run after it. > testCallableCancel() test hangs sporadically > -------------------------------------------- > > Key: JEXL-206 > URL: https://issues.apache.org/jira/browse/JEXL-206 > Project: Commons JEXL > Issue Type: Bug > Affects Versions: 3.0 > Reporter: Dmitri Blinov > > I'm struggling with strange behaviour of the building process, it seems that > time after time the process hangs somewhere in the middle of the tests stage. > First I thought it was somehow related to memory problems so I changed fork > mode of the test plugin by adding > <forkMode>pertest</forkMode> to maven-surefire-plugin configuration. But that > helped for a couple of times to cleanly build jexl and run all tests > successfully. The other times it simply hanged on test stage. I have managed > to detect that it is the testCallableCancel() test that hangs. One of its > worker threads has a stack trace as follows: > {code} > org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:893) > org.apache.commons.jexl3.parser.ASTWhileStatement.jjtAccept(ASTWhileStatement.java:18) > org.apache.commons.jexl3.internal.Interpreter.visit(Interpreter.java:1119) > org.apache.commons.jexl3.parser.ASTJexlScript.jjtAccept(ASTJexlScript.java:55) > org.apache.commons.jexl3.internal.Interpreter.interpret(Interpreter.java:210) > org.apache.commons.jexl3.internal.Script$Callable.interpret(Script.java:364) > org.apache.commons.jexl3.internal.Script$Callable.call(Script.java:372) > - locked org.apache.commons.jexl3.internal.Script$Callable@18399f62 > java.util.concurrent.FutureTask.run(FutureTask.java:262) > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > java.lang.Thread.run(Thread.java:745) > {code} > I have adjusted the test code with prinln() to dig further what is going on: > {code} > @Test > public void testCallableCancel() throws Exception { > System.out.println("testCallableCancel(): started"); > JexlScript e = JEXL.createScript("while(true);"); > final Script.Callable c = (Script.Callable) e.callable(null); > Object t = 42; > Callable<Object> kc = new Callable<Object>() { > @Override > public Object call() throws Exception { > System.out.println("testCallableCancel(): cancel() is > called"); > return c.cancel(); > } > }; > Callable<Object> xkc = new Callable<Object>() { > @Override > public Object call() throws Exception { > System.out.println("testCallableCancel(): run() is called"); > return c.call(); > } > }; > ExecutorService executor = Executors.newFixedThreadPool(2); > Future<?> future = executor.submit(xkc); > Future<?> kfc = executor.submit(kc); > try { > Assert.assertTrue((Boolean) kfc.get()); > System.out.println("testCallableCancel(): canceled()"); > t = future.get(); > Assert.fail("should have been cancelled"); > } catch (ExecutionException xexec) { > // ok, ignore > Assert.assertTrue(xexec.getCause() instanceof > JexlException.Cancel); > } finally { > executor.shutdown(); > } > Assert.assertTrue(c.isCancelled()); > System.out.println("testCallableCancel(): finished"); > } > {code} > If the test hangs it prints the following: > {panel} > testCallableCancel(): started > testCallableCancel(): run() is called > testCallableCancel(): cancel() is called > testCallableCancel(): canceled() > {panel} > If the test runs as normal and does not hang it prints the following: > {panel} > testCallableCancel(): started > testCallableCancel(): run() is called > testCallableCancel(): cancel() is called > testCallableCancel(): canceled() > testCallableCancel(): finished > {panel} -- This message was sent by Atlassian JIRA (v6.3.4#6332)