Deadlock in ManagedConnectionFactory

Solution Verified - Updated -

Issue

  • Our JBoss server hangs and becomes unresponsive.  From the thread dump, the root cause appears to be threads deadlocked calling Properties.equals() in ManagedConnectionFactory code, for example:
    "http-0.0.0.0-8080-1":
     at java.util.Hashtable.size(Hashtable.java:206)
     - waiting to lock <0x0000000779ebe9c0> (a java.util.Properties)
     at java.util.Hashtable.equals(Hashtable.java:742)
     - locked <0x0000000779ea2ff8> (a java.util.Properties)
     at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.equals(XAManagedConnectionFactory.java:524)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.run(BaseWrapperManagedConnectionFactory.java:640)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.addMatchingProperties(BaseWrapperManagedConnectionFactory.java:655)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:504)
     - locked <0x0000000779fccef0> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.checkIdentity(BaseWrapperManagedConnection.java:522)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.getConnection(BaseWrapperManagedConnection.java:283)
     at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:505)
     at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:941)
     at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:89)
...

"JCA PoolFiller":
     at java.util.Hashtable.get(Hashtable.java:333)
     - waiting to lock <0x0000000779ea2ff8> (a java.util.Properties)
     at java.util.Hashtable.equals(Hashtable.java:755)
     - locked <0x0000000779ebe9c0> (a java.util.Properties)
     at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.equals(XAManagedConnectionFactory.java:524)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.run(BaseWrapperManagedConnectionFactory.java:640)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory$SubjectActions.addMatchingProperties(BaseWrapperManagedConnectionFactory.java:655)
     at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:504)
     - locked <0x0000000779ce3178> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory)
     at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:443)
     at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:409)
     - locked <0x0000000779ce3178> (a org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory)
     at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:639)
     at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:547)
     at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74)
     at java.lang.Thread.run(Thread.java:662

Environment

  • JBoss Enterprise Application Platform (EAP) 5.1.2 and earlier

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