[CAY-1513] Deadlock in PoolManager

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.0, 3.0.1
• Fix Version/s: 3.1B1, 3.0.3
• Component/s: Core Library
• Environment: Linux
• Assignee: Unassigned
• Reporter: Laurent Marchal
• Created: 23/Nov/10 16:43
• Updated: 13/Nov/11 14:20
• Resolved: 03/Nov/11 08:18

Description

I'm using cayenne 3.0 ans I'm experiencing a deadlock when I exit my application. I call PoolManager.dispose() to disconnect all connections, but it seems if at the same time a pooled connection is returned to the pool then it deadlocks.

Here is the deadlock as detected by the java console.

Name: Worker-2
State: BLOCKED on com.sma.core.net.OpconPoolManager@197871d owned by: main
Total blocked: 327 Total waited: 475

Stack trace:
org.apache.cayenne.conn.PoolManager.connectionClosed(PoolManager.java:438)
org.apache.cayenne.conn.PooledConnectionImpl.connectionClosedNotification(PooledConnectionImpl.java:181)

• locked java.util.Collections$SynchronizedRandomAccessList@12a12fc
  org.apache.cayenne.conn.PooledConnectionImpl.returnConnectionToThePool(PooledConnectionImpl.java:146)
  org.apache.cayenne.conn.ConnectionWrapper.close(ConnectionWrapper.java:127)
  org.apache.cayenne.access.ExternalTransaction.close(ExternalTransaction.java:168)
  org.apache.cayenne.access.ExternalTransaction.commit(ExternalTransaction.java:105)

_______________________________________________________________________________________________________

Name: main
State: BLOCKED on java.util.Collections$SynchronizedRandomAccessList@12a12fc owned by: Worker-2
Total blocked: 30 Total waited: 122

Stack trace:
org.apache.cayenne.conn.PooledConnectionImpl.removeConnectionEventListener(PooledConnectionImpl.java:97)
org.apache.cayenne.conn.PoolManager.dispose(OpconPoolManager.java:169)

• locked org.apache.cayenne.conn.PoolManager@197871d
  com.sma.core.session.Session.disconnect(Session.java:189)
• locked java.lang.Object@167a300
  com.sma.core.session.Session.logout(Session.java:269)
• locked java.lang.Object@167a300