Hi All,
I am using Oracle 11g and I am trying to delete some records from database using some GUI. In that case I am getting following error:
java.lang.Exception: org.hibernate.AssertionFailure: scrollable result sets are not enabled. When I restart the application's service, this error is going away and deletion is working fine.

Other related jars that I am using is as follow:
ojdbc5.jar
hibernate-3.0.5.jar

This is the error that i am getting in log:

<log4j:event logger="org.hibernate.AssertionFailure" timestamp="1263964931355" sequenceNumber="24" level="ERROR" thread="SocketListener0-2">
<log4j:message><![CDATA[an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)]]></log4j:message>
<log4j:throwable><![CDATA[org.hibernate.AssertionFailure: scrollable result sets are not enabled
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:368)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:334)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:88)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1162)
at org.hibernate.loader.Loader.scroll(Loader.java:1634)
at org.hibernate.loader.hql.QueryLoader.scroll(QueryLoader.java:443)
at org.hibernate.hql.ast.QueryTranslatorImpl.scroll(QueryTranslatorImpl.java:291)
at org.hibernate.impl.SessionImpl.scroll(SessionImpl.java:960)
at org.hibernate.impl.QueryImpl.scroll(QueryImpl.java:62)
at com.sample.persistence.WorklistItemDAO.purge(WorklistItemDAO.java:145)
at com.sample.server.worklistmanager.WorklistManager.purge(WorklistManager.java:695)
at com.sample.server.webservices.CCGPIWorklistHandler.purge(CCGPIWorklistHandler.java:329)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.xmlrpc.Invoker.execute(Invoker.java:130)
at org.apache.xmlrpc.XmlRpcWorker.invokeHandler(XmlRpcWorker.java:84)
at org.apache.xmlrpc.XmlRpcWorker.execute(XmlRpcWorker.java:146)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java:139)
at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java:114)
at com.sample.server.webservices.XmlRpcServlet.service(XmlRpcServlet.java:63)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
at org.mortbay.jetty.servlet.ServletHandler.dispatch(ServletHandler.java:666)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
at org.mortbay.http.HttpServer.service(HttpServer.java:909)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:816)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:982)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:833)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
]]></log4j:throwable>
</log4j:event>

Thanks
Shiv