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https://issues.apache.org/jira/browse/POOL-356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662119#comment-16662119
]
Mark Struberg commented on POOL-356:
------------------------------------
This is what it looks like in the thread dump.
{noformat}
"Thread-198@1388" daemon prio=5 tid=0xd4 nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at
org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:590)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:425)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:346)
at
org.apache.commons.pool2.impl.TestGenericObjectPool$TestThread.run(TestGenericObjectPool.java:1680)
at java.lang.Thread.run(Thread.java:748)
"Thread-197@1387" daemon prio=5 tid=0xd3 nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at
org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:590)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:425)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:346)
at
org.apache.commons.pool2.impl.TestGenericObjectPool$TestThread.run(TestGenericObjectPool.java:1680)
at java.lang.Thread.run(Thread.java:748)
"Thread-196@1386" daemon prio=5 tid=0xd2 nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at
org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:590)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:425)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:346)
at
org.apache.commons.pool2.impl.TestGenericObjectPool$TestThread.run(TestGenericObjectPool.java:1680)
at java.lang.Thread.run(Thread.java:748)
{noformat}
> deadlock if borrowObject gets called to fast and maxIdle is 0
> -------------------------------------------------------------
>
> Key: POOL-356
> URL: https://issues.apache.org/jira/browse/POOL-356
> Project: Commons Pool
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Mark Struberg
> Assignee: Mark Struberg
> Priority: Major
> Fix For: 2.6.1
>
>
> I figured this while creating a unit test for OpenJPA. But also did see this
> in real production with commons-dbcp2. See DBCP-513 for more info.
> See this comment for a precise explanation what happens
> https://issues.apache.org/jira/browse/DBCP-513?focusedCommentId=16660545&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16660545
> The problem is basically that the logic to immediately destroy a pool object
> does not notify the DeLinkedQueue:
> {code}
> if (isClosed() || maxIdleSave > -1 && maxIdleSave <=
> idleObjects.size()) {
> try {
> destroy(p);
> {code}
> But the borrowObject code is locking on that condition...
> {code}
> if (borrowMaxWaitMillis < 0) {
> p = idleObjects.takeFirst();
> }
> {code}
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