Could you please provide the source of your Employee and Department classes?
And AFAIK you must not use full qualified class names in queries but the
simple class name ("Department" only).
Regards,
Stephan
2010/2/16 Sushama Khadilkar <sush.khadil...@gmail.com>
> package com.wissen.enterprisebysush.server;
>
> import java.util.List;
>
> import javax.jdo.JDOHelper;
> import javax.jdo.PersistenceManager;
> import javax.jdo.PersistenceManagerFactory;
> import javax.jdo.Transaction;
> import javax.persistence.EntityManager;
> import javax.persistence.EntityManagerFactory;
> import javax.persistence.EntityTransaction;
> import javax.persistence.Persistence;
> import javax.persistence.Query;
>
> import com.google.gwt.user.client.Window;
> import com.google.gwt.user.server.rpc.RemoteServiceServlet;
> import com.wissen.enterprisebysush.client.GreetingService;
> import com.wissen.enterprisebysush.server.domainobject.Department;
> import com.wissen.enterprisebysush.server.domainobject.Employee;
>
> /**
> * The server side implementation of the RPC service.
> */
> @SuppressWarnings("serial")
> public class GreetingServiceImpl extends RemoteServiceServlet implements
> GreetingService {
>
> EntityManagerFactory emf =
> Persistence.createEntityManagerFactory("transactions-optional");
>
> public String greetServer(String input) {
> String serverInfo = getServletContext().getServerInfo();
> String userAgent = getThreadLocalRequest().getHeader("User-Agent");
> return "Hello, " + input + "!<br><br>I am running " + serverInfo +
> ".<br><br>It looks like you are using:<br>" + userAgent;
> }
>
> @SuppressWarnings("unchecked")
> public void addDept(String dept_name, String dept_head) {
>
> EntityManager em = null;
>
> try {
> em = emf.createEntityManager();
> em.getTransaction().begin();
> Department d = new Department();
> d.setDept_name(dept_name);
> d.setHead(dept_head);
>
> Query q = em.createQuery("select from
> com.wissen.enterprisebysush.server.domainobject.Department d");
> List<Department> deptList = q.getResultList();
>
> for (Department dept : deptList) {
> System.out.println("Department name: " +
> dept.getDept_name());
> }
>
> em.persist(d);
>
> } finally {
> em.getTransaction().commit();
> em.close();
>
> }
>
> }
>
> public void addEmp(String emp_name, String emp_sal, String did) {
> EntityManager em = emf.createEntityManager();
> try {
>
>
> String s = did;
>
> EntityTransaction transaction = em.getTransaction();
> transaction.begin();
> System.out.println("value of Department_name is::" + s);
> System.out.println("Transaction is active and
> is::"+transaction);
>
> // Query q = em.createQuery("select dept_id from
> com.wissen.enterprisebysush.server.domainobject.Department d where
> d.dept_name = ?1");
> // q.setParameter(1, s);
> // System.out.println("Name of Department is::" +
> s);
> // Department dept = (Department)
> q.getSingleResult();
>
> Query q = em.createQuery("select from
> com.wissen.enterprisebysush.server.domainobject.Department d");
> Department dept = (Department) q.getResultList().get(0);
> System.out.println("Name of Department is::" +
> dept.getDept_name());
>
> //System.out.println("Query executed
> Successfully!!!!!!!!!!!!!!" + q.getSingleResult());
> Employee e = new Employee();
> e.setEmp_name("Abcdh");
> e.setEmp_sal("5000");
> e.setDepartment(dept);
> em.persist(e);
>
> System.out.println("Transaction: " + transaction);
>
> transaction.commit();
> em.close();
>
> } catch (NullPointerException e) {
> e.printStackTrace();
> System.out.println("Exception::" + e.getCause());
> } finally {
>
> }
> }
>
> }
>
>
> Output is::
>
>
> The server is running at http://localhost:8090/
> value of Department_name is::Production
> Transaction is active and
> is::org.datanucleus.jpa.entitytransactioni...@1a21c7d
> Name of Department is::Accounts
> Transaction: org.datanucleus.jpa.entitytransactioni...@1a21c7d
> java.lang.NullPointerException
> Exception::null at
> com.google.appengine.api.datastore.KeyFactory.stringToKey(KeyFactory.java:181)
> at
> org.datanucleus.store.appengine.DatastoreElementContainerStoreSpecialization.extractElementKey(DatastoreElementContainerStoreSpecialization.java:170)
> at
> org.datanucleus.store.appengine.DatastoreAbstractCollectionStoreSpecialization.contains(DatastoreAbstractCollectionStoreSpecialization.java:57)
> at
> org.datanucleus.store.mapped.scostore.AbstractCollectionStore.contains(AbstractCollectionStore.java:116)
> at org.datanucleus.sco.backed.List.contains(List.java:455)
> at
> org.datanucleus.state.RelationshipManager.processManyToOneBidirectionalRelation(RelationshipManager.java:690)
> at
> org.datanucleus.state.RelationshipManager.process(RelationshipManager.java:294)
> at
> org.datanucleus.state.JDOStateManagerImpl.processManagedRelations(JDOStateManagerImpl.java:2377)
> at
> org.datanucleus.ObjectManagerImpl.performManagedRelationships(ObjectManagerImpl.java:2706)
> at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:2744)
> at
> org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:2886)
> at
> org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:348)
> at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:235)
> at
> org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:104)
> at
> com.wissen.enterprisebysush.server.GreetingServiceImpl.addEmp(GreetingServiceImpl.java:94)
> 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:597)
> at
> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
> at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166)
> at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> at
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
> at
> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
> at
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> at
> com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> at
> com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> at org.mortbay.jetty.Server.handle(Server.java:313)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
>
> NullPointerException at transaction.commit().
>
>
>
>
>
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