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From "Stefan Wokusch (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1716) Deadlock with openjpa.Multithreaded=true
Date Fri, 02 Jul 2010 02:04:50 GMT
Deadlock with openjpa.Multithreaded=true
----------------------------------------

                 Key: OPENJPA-1716
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1716
             Project: OpenJPA
          Issue Type: Bug
    Affects Versions: 2.0.0, 2.0.0-beta3, 2.0.0-beta2, 2.0.0-beta, 2.0.0-M3, 2.0.0-M2, 2.0.0-M1
            Reporter: Stefan Wokusch


There is a Deadlock by using Multithreaded=true and work with some Threads on the same Entitymanager.

After many hours of debugging, i found a solution for that Deadlock: The Problem could be
solved by adding another lock into the lock Method of the StateManagerImpl:
StateManagerImpl ~line3308
    /**
     * Lock the state manager if the multithreaded option is set.
     */
    protected void lock() {
        if (_instanceLock != null){
        	_broker.lock();//<- This is the new Part to fix the Deadlock
        	_instanceLock.lock();
        }
    }

Worked for me without Problems for a long time.


Some other Configurations:
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0">
	<persistence-unit name="default" transaction-type="RESOURCE_LOCAL">
		<mapping-file>orm.xml</mapping-file>
		
		<class>...</class>
		<class>...</class>
		
		<properties>
			<property name="openjpa.OrphanedKeyAction" value="log(Channel=Orphans, Level=TRACE)"
/>

			<property name="openjpa.ConnectionFactoryProperties" value="PrettyPrint=true, PrettyPrintLineLength=80"
/>

			<property name="openjpa.Multithreaded" value="true" />
			<property name="openjpa.InverseManager" value="true" />
			<property name="openjpa.LockManager" value="none" />
			<property name="openjpa.WriteLockLevel" value="none" />
			<property name="openjpa.Compatibility" value="
					QuotedNumbersInQueries=true, 
					CopyOnDetach=true,
					cascadeWithDetach=true,
					superclassDiscriminatorStrategyByDefault=false
			" />

			<property name="openjpa.DetachState" value="fetch-groups" />

			<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema" />

			<!-- Default DataSource -->
			<property name="openjpa.ConnectionURL" value="jdbc:h2:db/test" />
			<property name="openjpa.ConnectionDriverName" value="org.h2.Driver" />
		</properties>
	</persistence-unit>
</persistence>


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