I get the following error from weblogic . Internally the method com.wipro.dms.gp.daoimpl.ManageSAFORMImpl.getSIMDetails fires a query "select * from item_serial_inv where reference_no between :1 and :2" . clear() method is called on entity manager at the end of the method.

JPA 2.1 is used with hiibernate 3.6

####<Mar 26, 2015 10:53:32 AM BDT> <Error> <WebLogicServer> <dmsapp2> <dmsprod-ms2> <[ACTIVE] ExecuteThread: '16' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1427345612884> <BEA-000337> <[STUCK] ExecuteThread: '11' for queue: 'weblogic.kernel.Default (self-tuning)' has been busy for "656" seconds working on the request "Workmanager: default, Version: 0, Scheduled=true, Started=true, Started time: 656495 ms ", which is more than the configured time (StuckThreadMaxTime) of "600" seconds in "server-failure-trigger". Stack trace:
java.lang.System.identityHashCode(Native Method)
org.hibernate.util.IdentityMap$IdentityKey.hashCode(IdentityMap.java:136)
java.util.HashMap.hash(HashMap.java:362)
java.util.HashMap.put(HashMap.java:492)
org.hibernate.util.IdentityMap.put(IdentityMap.java:170)
org.hibernate.engine.StatefulPersistenceContext.addEntry(StatefulPersistenceContext.java:504)
org.hibernate.engine.StatefulPersistenceContext.addEntity(StatefulPersistenceContext.java:458)
org.hibernate.engine.TwoPhaseLoad.addUninitializedEntity(TwoPhaseLoad.java:289)
org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1513)
org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1455)
org.hibernate.loader.Loader.getRow(Loader.java:1355)
org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:611)
org.hibernate.loader.Loader.doQuery(Loader.java:829)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
org.hibernate.loader.Loader.doList(Loader.java:2542)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
org.hibernate.loader.Loader.list(Loader.java:2271)
org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:459)
org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:365)
org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:65)
com.wipro.dms.gp.daoimpl.ManageSAFORMImpl.getSIMDetails(ManageSAFORMImpl.java:425)