proxy handle is no longer valid

[Kevin Sheng]

When closing hibernate session, I got an exception. I am using Hibernate 4.1.7-Final. I searched the web to no avail.

Can anyone shed light on this issue? Thanks/Kevin

                Session session = HibernateUtil.getSession();
	StoredProcedure sp = (StoredProcedure) session.getNamedQuery("GetAStringBack") 
                .setParameter("StartDate", startDate) 
                .setParameter("EndDate", endDate) 
                .uniqueResult(); 
                session.close();

org.hibernate.HibernateException: proxy handle is no longer valid
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.errorIfInvalid(AbstractProxyHandler.java:63)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:100)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at $Proxy9.getWrappedObject(Unknown Source)
at org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl.close(JdbcResourceRegistryImpl.java:215)
at org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl.cleanup(JdbcResourceRegistryImpl.java:189)
at org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl.close(JdbcResourceRegistryImpl.java:206)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.close(LogicalConnectionImpl.java:197)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.close(JdbcCoordinatorImpl.java:141)
at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.close(TransactionCoordinatorImpl.java:276)
at org.hibernate.internal.SessionImpl.close(SessionImpl.java:349)
at com.shengtech.docm.entitymanager.StoredProcedureManager.runStoredProcedure(StoredProcedureManager.java:32)
at com.shengtech.docm.entitymanager.StoredProcedureManager.main(StoredProcedureManager.java:45)