1. The code snippet and the class definitions as presented in the email worked without error with MySQL. The error possibly in somewhere else. 2. The failure suggests NPE caused by JBoss not finding a class (LongId?) -- can you switch type of A.id to long from Long and try? 3. Looks like your code is querying the extent of B and then deleting each instance. Please note that JPA supports delete by query which avoids fetching instances in memory before deleting them. 4. Instances of class B as described here will be stored in the same table defined for A -- no need to specify it explictly 5. please post to open-jpa mailing list directly and *not* directly to my mail address.
Pinaki Poddar BEA Systems 415.402.7317 -----Original Message----- From: Praveen G [mailto:[EMAIL PROTECTED] Sent: Friday, May 18, 2007 10:27 AM To: Pinaki Poddar; open-jpa-dev@incubator.apache.org; Patrick Linskey Subject: Exception while retrieving the data from database Hello Pinaki/Patrick, I am having following two classes @Entity @Table(name = "LOG_DB2") public class B extends A { @Column(name = "INSTANCE_NAME") private String instanceName; @Column(name = "DB2_TIMESTAMP") private Timestamp db2Timestamp; @Column(name = "DB_ALIAS") private String dbAlias; @Column(name = "DB_PARTITION") private int partitionNum; @Entity @Table(name = "LOG_DB2") @MappedSuperclass public class A { @Column(name = "LOG_ID") @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private Long id; @Column(name = "TAG") private String tag; @Column(name = "SUBTAG") private String subtag; I am able to store the data into database successfully where as I am facing the problem while retriveing the data from the database, the following is the code and highlighted the problem area in the code em=ServiceLocator.getOpenJPASession("pu1"); em.getTransaction().begin(); Query q = em.createQuery("select ad from B ad"); for (B l : (List<B>)q.getResultList()) { System.out.println("Host Name is : "+l.getHostName()+" Instance Name is "+l.getInstanceName()); em.remove(l); } em.getTransaction().commit(); The following error occurs <0.9.7-incubating nonfatal general error> org.apache.openjpa.persistence.PersistenceException: null at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:857) at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:756) at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.ja va:776) at org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257) at org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java :2152) at org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:251) at org.apache.openjpa.jdbc.kernel.InstanceResultObjectProvider.getResultObj ect(InstanceResultObjectProvider.java:59) at org.apache.openjpa.lib.rop.EagerResultList.<init>(EagerResultList.java:3 6) at org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1219) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:987) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:796) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:766) at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:762) at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:5 17) at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:230) at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:26 9) at com.server.dao.audit.hibernate.AuditDAOImpl.purgeDebugMessages(AuditDAOI mpl.java:196) at com.server.messageanalyzer.MessageAnalyzerManager.purgeDebugMessages(Mes sageAnalyzerManager.java:113) at com.server.mgmt.ConsoleManagement.purgeDebugMessages(ConsoleManagement.j ava:675) at com.server.mgmt.console.log.LogAnalyzerAction.execute(LogAnalyzerAction. java:217) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr ocessor.java:431) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 236) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at com.server.mgmt.console.access.AuthorizationFilter.doFilter(Authorizatio nFilter.java:70) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilte r.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAs sociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.j ava:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:1 48) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:86 9) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.proc essConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollow erWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool .java:684) at java.lang.Thread.run(Thread.java:803) Caused by: java.lang.NullPointerException at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoad er.java:620) at java.lang.ClassLoader.loadClass(ClassLoader.java:602) at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClass Loader.java:464) at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoad er.java:405) at java.lang.ClassLoader.loadClass(ClassLoader.java:568) at com.server.dao.audit.A.pcCopyKeyFieldsFromObjectId(A.java) at com.server.dao.audit.B.pcNewInstance(B.java) at org.apache.openjpa.enhance.PCRegistry.newInstance(PCRegistry.java:121) at org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.j ava:250) at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStor eManager.java:330) at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreMana ger.java:255) at org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingSt oreManager.java:111) at org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.jav a:57) at org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:876) at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:834) Please help me to resolve the above problem as soon as possible. Thanks, Praveen Kumar. Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.
