Hi my name is Michele,
i found this error when my application run, anybody knows what does it mean????


javax.transaction.TransactionRolledbackException: Load failed; nested exception is:
java.lang.NullPointerException; nested exception is:
java.rmi.ServerException: Load failed; nested exception is:
java.lang.NullPointerException; nested exception is:
javax.transaction.TransactionRolledbackException: Load failed; nested exception is:
java.lang.NullPointerException; nested exception is:
java.rmi.ServerException: Load failed; nested exception is:
java.lang.NullPointerException
javax.transaction.TransactionRolledbackException: Load failed; nested exception is:
java.lang.NullPointerException; nested exception is:
java.rmi.ServerException: Load failed; nested exception is:
java.lang.NullPointerException
java.rmi.ServerException: Load failed; nested exception is:
java.lang.NullPointerException
java.lang.NullPointerException
at java.lang.reflect.Field.set(Native Method)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCCommand.setCMPFieldValue(JDBCCommand.java:655)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCLoadEntityCommand.loadOneEntity(JDBCLoadEntityCommand.java:217)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCLoadEntityCommand.handleResult(JDBCLoadEntityCommand.java:176)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCQueryCommand.executeStatementAndHandleResult(JDBCQueryCommand.java:59)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCCommand.jdbcExecute(JDBCCommand.java:160)
at org.jboss.ejb.plugins.jaws.jdbc.JDBCLoadEntityCommand.execute(JDBCLoadEntityCommand.java:147)
at org.jboss.ejb.plugins.jaws.JAWSPersistenceManager.loadEntity(JAWSPersistenceManager.java:156)
at org.jboss.ejb.plugins.CMPPersistenceManager.loadEntity(CMPPersistenceManager.java:362)
at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invoke(EntitySynchronizationInterceptor.java:286)
at org.jboss.ejb.plugins.EntityInstanceInterceptor.invoke(EntityInstanceInterceptor.java:208)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockInterceptor.java:136)
at org.jboss.ejb.plugins.TxInterceptorCMT.invokeNext(TxInterceptorCMT.java:133)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:307)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:99)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:128)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
at org.jboss.ejb.EntityContainer.invoke(EntityContainer.java:427)
at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invoke(JRMPContainerInvoker.java:489)
at org.jboss.ejb.plugins.jrmp.interfaces.GenericProxy.invokeContainer(GenericProxy.java:335)
at org.jboss.ejb.plugins.jrmp.interfaces.EntityProxy.invoke(EntityProxy.java:133)
at $Proxy7.getNome(Unknown Source)
at com.ejb.session.ClienteSession.ClienteCollectionBean.findByNome(ClienteCollectionBean.java:53)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:543)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:87)
at org.jboss.ejb.plugins.TxInterceptorCMT.invokeNext(TxInterceptorCMT.java:133)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:307)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:99)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:128)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:286)
at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invoke(JRMPContainerInvoker.java:489)
at org.jboss.ejb.plugins.jrmp.interfaces.GenericProxy.invokeContainer(GenericProxy.java:335)
at org.jboss.ejb.plugins.jrmp.interfaces.StatelessSessionProxy.invoke(StatelessSessionProxy.java:123)
at $Proxy3.findByNome(Unknown Source)
at com.servlet.Cliente.ServletCliente.testBean(ServletCliente.java:59)
at com.servlet.Cliente.ServletCliente.doGet(ServletCliente.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Unknown Source)

I made a session EJB which use a CMP entity bean and the client is a servlet.

thanks