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Dmitri Blinov commented on JEXL-206: ------------------------------------ After two hours of continious testing I can tell the problem seems to go away > 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)