Hi All , I am getting this exception after making a call to persist some data . Please can anybody help me out : ERROR [[TestServlet]] Servlet.service() for servlet TestServlet threw exception java.lang.ClassCastException: org.hibernate.ejb.HibernatePersistence at javax.persistence.Persistence.findAllProviders(Persistence.java:112) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79) at Ejbtest.mainTest(Ejbtest.java:47) at TestServlet.doPost(TestServlet.java:75) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source) My Persistence.xml lokks like this : <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="testApp"> oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider Ejbtest Employee Software SoftwareFile Tab1 <!-- <jta-data-source>java:/XAOracleDS</jta-data-source> --> <!-- Provider-specific connection properties --> <!-- Provider-specific settings --> <!-- other values are: drop-and-create-tables|none --> </persistence-unit> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060769#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...