Hi i wanted to change one of my fields type from big_decimal to long.However after that i am having an exception like this.

java.lang.RuntimeException: org.hibernate.HibernateException: identifier of an instance of com.agmlab.webhosting.db.model.DomainCategory was altered from com.agmlab.webhosting.db.model.DomainCategoryId@69a8 to com.agmlab.webhosting.db.model.DomainCategoryId@69a9 at com.agmlab.webhosting.actions.DomainAddAction.execute(DomainAddAction.java:191) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1485) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:527) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:846) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:397) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:218) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.HttpRequestHandler.run(HttpRequestHandler.java:119) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].server.http.HttpRequestHandler.run(HttpRequestHandler.java:112) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:245) at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:231) at oracle.oc4j.network.ServerSocketAcceptHandler.access$1000(ServerSocketAcceptHandler.java:33) at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:820) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) - Developer Preview].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595)

i dont know the reason..any help will be appricated.Thanks