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.
Datasource has 100 connection pool size.

###<Mar 26, 2015 10:48:32 AM BDT> <Error> <WebLogicServer> <dmsapp2> <dmsprod-ms2> <[ACTIVE] ExecuteThread: '14' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1427345312868> <BEA-000337> <[STUCK] ExecuteThread: '3' 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: 656590 ms ", which is more than the configured time (StuckThreadMaxTime) of "600" seconds in "server-failure-trigger". Stack trace:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:152)
java.net.SocketInputStream.read(SocketInputStream.java:122)
oracle.net.ns.Packet.receive(Packet.java:300)
oracle.net.ns.DataPacket.receive(DataPacket.java:106)
oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)
oracle.net.ns.NetInputStream.read(NetInputStream.java:260)
oracle.net.ns.NetInputStream.read(NetInputStream.java:185)
oracle.net.ns.NetInputStream.read(NetInputStream.java:102)
oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:124)
oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:80)
oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1137)
oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:290)
oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1119)
oracle.jdbc.driver.OracleResultSetImpl.close_or_fetch_from_next(OracleResultSetImpl.java:375)
oracle.jdbc.driver.OracleResultSetImpl.next(OracleResultSetImpl.java:279)
weblogic.jdbc.wrapper.ResultSet_oracle_jdbc_driver_OracleResultSetImpl.next(Unknown Source)
org.hibernate.loader.Loader.doQuery(Loader.java:825)
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)