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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