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https://issues.apache.org/jira/browse/DBCP-65?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Phil Steitz resolved DBCP-65.
-----------------------------
Resolution: Fixed
Fix Version/s: (was: 1.3)
1.2.2
Synchronization was removed from the perpareStatement methods per last comment
in r498524.
> [dbcp] Deadlock when evicting dbcp objects (testWhileIdle=true)
> ---------------------------------------------------------------
>
> Key: DBCP-65
> URL: https://issues.apache.org/jira/browse/DBCP-65
> Project: Commons Dbcp
> Issue Type: Bug
> Environment: Operating System: All
> Platform: All
> Reporter: Wang Xianzhu
> Fix For: 1.2.2
>
>
> The GenericKeyedObjectPool$Evictor thread has probability of deadlock with
> dbcp
> objects.
> For example, at a certain time, a normal user thread calls a PoolingConnection
> object's synchronized method, which in turn calls GenericKeyedObjectPool
> object's synchronzied method.
> At the same time, the evictor thread calls the GenericKeyedObjectPool object's
> synchronized method 'evict', which in turn calls the PoolingConnection
> object's
> synchronized method. When testWhileIdle=true, the probability of evictor
> calling GenericKeyedObjectPool's synchronized method is much greater.
> The following is the deadlock information in the thread dump of our program
> (testWhileIdle=true):
> "Thread-106":
> at
> org.apache.commons.dbcp.AbandonedTrace.removeTrace(AbandonedTrace.java:221)
> - waiting to lock <0x6a6b1b80> (a
> org.apache.commons.dbcp.PoolingConnection)
> at
> org.apache.commons.dbcp.PoolablePreparedStatement.passivate(PoolablePreparedStatement.java:100)
> at
> org.apache.commons.dbcp.PoolingConnection.passivateObject(PoolingConnection.java:239)
> at
> org.apache.commons.pool.impl.GenericKeyedObjectPool.evict(GenericKeyedObjectPool.java:1001)
> - locked <0x6a6b1858> (a
> org.apache.commons.pool.impl.GenericKeyedObjectPool)
> at
> org.apache.commons.pool.impl.GenericKeyedObjectPool$Evictor.run(GenericKeyedObjectPool.java:1156)
> at java.lang.Thread.run(Thread.java:534)
> "Thread-41":
> at
> org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:715)
> - waiting to lock <0x6a6b1858> (a
> org.apache.commons.pool.impl.GenericKeyedObjectPool)
> at
> org.apache.commons.dbcp.PoolingConnection.prepareStatement(PoolingConnection.java:87)
> - locked <0x6a6b1b80> (a org.apache.commons.dbcp.PoolingConnection)
> at
> org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:185)
> at
> org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.prepareStatement(PoolingDataSource.java:278)
> ...
> This problem can be worked around by setting testWhileIdle to false, although
> there is still very small possibility of deadlock.
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