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From "Tobias Mattsson (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3158) Deadlock in DBCP when accessing node
Date Fri, 25 Nov 2011 14:59:39 GMT
Deadlock in DBCP when accessing node
------------------------------------

                 Key: JCR-3158
                 URL: https://issues.apache.org/jira/browse/JCR-3158
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 2.3.3, 2.2.9
         Environment: Java 6
Jackrabbit 2.2.9
Derby
            Reporter: Tobias Mattsson
            Priority: Critical


I found a deadlock situation using JR 2.2.9, the problem is with DBCP 1.2.2 and is fixed in
DBCP 1.3, JR trunk also uses DBCP 1.2.2 and should also be updated

The ticket in dbcp is #DBCP-270, related tickets are #DBCP-65 #DBCP-281 #DBCP-271

Stack trace of where my call is stalled:
{code}
main@1, prio=5, in group 'main', status: 'MONITOR'
	 blocks Timer-1@2545
	 waiting for Timer-1@2545 to release lock on {1}
	  at org.apache.commons.pool.impl.GenericObjectPool.addObjectToPool(GenericObjectPool.java:1137)
	  at org.apache.commons.pool.impl.GenericObjectPool.returnObject(GenericObjectPool.java:1076)
	  at org.apache.commons.dbcp.PoolableConnection.close(PoolableConnection.java:87)
	  at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:181)
	  at org.apache.jackrabbit.core.util.db.DbUtility.close(DbUtility.java:75)
	  at org.apache.jackrabbit.core.util.db.ResultSetWrapper.invoke(ResultSetWrapper.java:63)
	  at $Proxy12.close(Unknown Source:-1)
	  at org.apache.jackrabbit.core.persistence.pool.BundleDbPersistenceManager.loadBundle(BundleDbPersistenceManager.java:1042)
	  at org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.getBundle(AbstractBundlePersistenceManager.java:669)
	  at org.apache.jackrabbit.core.persistence.bundle.AbstractBundlePersistenceManager.load(AbstractBundlePersistenceManager.java:415)
	  at org.apache.jackrabbit.core.state.SharedItemStateManager.loadItemState(SharedItemStateManager.java:1830)
	  at org.apache.jackrabbit.core.state.SharedItemStateManager.getNonVirtualItemState(SharedItemStateManager.java:1750)
	  at org.apache.jackrabbit.core.state.SharedItemStateManager.getItemState(SharedItemStateManager.java:265)
	  at org.apache.jackrabbit.core.state.LocalItemStateManager.getNodeState(LocalItemStateManager.java:109)
	  at org.apache.jackrabbit.core.state.LocalItemStateManager.getItemState(LocalItemStateManager.java:174)
	  at org.apache.jackrabbit.core.state.XAItemStateManager.getItemState(XAItemStateManager.java:260)
	  at org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
	  at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:382)
	  at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:669)
	  at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:647)
	  at org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:120)
	  at org.apache.jackrabbit.core.LazyItemIterator.next(LazyItemIterator.java:257)
	  at info.magnolia.jcr.iterator.DelegatingNodeIterator.next(DelegatingNodeIterator.java:79)
{code}

This is the offending thread:
{code}
Timer-1@2545 daemon, prio=5, in group 'main', status: 'MONITOR'
	 blocks main@1
	 waiting for main@1 to release lock on {1}
	  at org.apache.commons.dbcp.AbandonedTrace.addTrace(AbandonedTrace.java:176)
	  at org.apache.commons.dbcp.AbandonedTrace.init(AbandonedTrace.java:92)
	  at org.apache.commons.dbcp.AbandonedTrace.<init>(AbandonedTrace.java:82)
	  at org.apache.commons.dbcp.DelegatingStatement.<init>(DelegatingStatement.java:61)
	  at org.apache.commons.dbcp.DelegatingConnection.createStatement(DelegatingConnection.java:224)
	  at org.apache.commons.dbcp.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:331)
	  at org.apache.commons.dbcp.PoolableConnectionFactory.validateObject(PoolableConnectionFactory.java:312)
	  at org.apache.commons.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1217)
	  at org.apache.commons.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1341)
	  at java.util.TimerThread.mainLoop(Timer.java:512)
	  at java.util.TimerThread.run(Timer.java:462)
{code}

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