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From "Chris Allison (JIRA)" <j...@apache.org>
Subject [jira] [Created] (POOL-326) Threading issue
Date Fri, 12 May 2017 15:49:05 GMT
Chris Allison created POOL-326:
----------------------------------

             Summary: Threading issue
                 Key: POOL-326
                 URL: https://issues.apache.org/jira/browse/POOL-326
             Project: Commons Pool
          Issue Type: Bug
    Affects Versions: 2.4.2
            Reporter: Chris Allison
         Attachments: ObjectPoolIssue.java

I'll included a test to help reproduce this issue.  Take a look at the embedded comments as
it's extremely difficult to reproduce.  I've seen the provided test show the failure on more
than one PC so I believe it will show the problem.

Example stack trace:
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at threading_pool.ObjectPoolIssue.run(ObjectPoolIssue.java:62)
	at threading_pool.ObjectPoolIssue.main(ObjectPoolIssue.java:22)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.NullPointerException
	at org.apache.commons.pool2.impl.GenericKeyedObjectPool.create(GenericKeyedObjectPool.java:1028)
	at org.apache.commons.pool2.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:380)
	at org.apache.commons.pool2.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:279)
	at threading_pool.ObjectPoolIssue$Task.call(ObjectPoolIssue.java:105)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)



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