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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JEXL-206) testCallableCancel() test hangs sporadically
Date Wed, 13 Jul 2016 08:29:20 GMT

    [ https://issues.apache.org/jira/browse/JEXL-206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15374593#comment-15374593
] 

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}



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