Importing data on WebSphere 5.1 causing ConcurrentModificationException

2005-11-07 17:39:01,057 ERROR [jira.action.admin.ImportParser] Exception importing entity null
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java(Inlined Compiled Code))
        at java.util.AbstractList$Itr.remove(AbstractList.java(Compiled Code))
        at java.util.AbstractCollection.remove(AbstractCollection.java(Compiled Code))
        at com.ibm.ejs.j2c.ConnectionHandleManager.removeHandle(ConnectionHandleManager.java:187)
        at com.ibm.ejs.j2c.ConnectionHandleManager.removeHandle(ConnectionHandleManager.java:148)
        at com.ibm.ejs.j2c.ConnectionEventListener.connectionClosed(ConnectionEventListener.java:179)
        at com.ibm.ws.rsadapter.spi.WSRdbManagedConnectionImpl.processConnectionClosedEvent(WSRdbManagedConnectionImpl.java(Compiled Code))
        at com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.closeWrapper(WSJdbcConnection.java:467)
        at com.ibm.ws.rsadapter.jdbc.WSJccConnection.closeWrapper(WSJccConnection.java:597)
        at com.ibm.ws.rsadapter.jdbc.WSJdbcObject.close(WSJdbcObject.java(Compiled Code))
        at org.ofbiz.core.entity.jdbc.SQLProcessor.close(SQLProcessor.java(Compiled Code))
        at org.ofbiz.core.entity.GenericDAO.insert(GenericDAO.java:93)
        at org.ofbiz.core.entity.GenericHelperDAO.create(GenericHelperDAO.java:63)
        at org.ofbiz.core.entity.GenericDelegator.create(GenericDelegator.java:470)
        at org.ofbiz.core.entity.GenericDelegator.create(GenericDelegator.java:450)
        at org.ofbiz.core.entity.GenericValue.create(GenericValue.java:77)
        at com.atlassian.jira.action.admin.ImportParser$1.run(ImportParser.java:188)
        at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
        at java.lang.Thread.run(Thread.java:568)