Hello List,
I try to do my first steps with EJB3 and set up a small example persisting a
detatched pojo entity (which is generated in a client) through a stateless
session bean.
I´ll attach the code of the three components at the end of the message.
When I invoke the the method, that should persist the entity I get the
following exception:
| Exception in thread "main" javax.ejb.EJBException:
javax.persistence.PersistenceException:
org.hibernate.PersistentObjectException: detached entity passed to persist:
com.toolsforjobs.j2ee.test.server.domain.Debtor
| at
org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:225)
| at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
| at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)
| at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)
| at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:398)
| at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
|
But that is exactly what I´m wanting: Saving a detached entry ;-)
What I´m doing wrong?
Regards
---
Joachim
The Entity Bean
| package com.toolsforjobs.j2ee.test.server.domain;
|
| import java.io.Serializable;
|
| import javax.persistence.CascadeType;
| import javax.persistence.Entity;
| import javax.persistence.GeneratedValue;
| import javax.persistence.Id;
| import javax.persistence.OneToOne;
| import javax.persistence.Transient;
|
| @Entity
| public class Debtor implements Serializable{
| @Transient
| private static final long serialVersionUID = 3154162344396113561L;
|
| int id;
| String idAtCustomer;
| double balance;
|
| //Address address;
|
| /*
| @OneToOne(cascade={CascadeType.ALL})
| public Address getAddress() {
| return address;
| }
| */
| public double getBalance() {
| return balance;
| }
|
| @Id @GeneratedValue
| public int getId() {
| return id;
| }
|
| public String getIdAtCustomer() {
| return idAtCustomer;
| }
| /*
| public void setAddress(Address address) {
| this.address = address;
| }
| */
| public void setBalance(double balance) {
| this.balance = balance;
| }
|
| public void setId(int id) {
| this.id = id;
| }
|
| public void setIdAtCustomer(String idAtCustomer) {
| this.idAtCustomer = idAtCustomer;
| }
| }
|
The Stateless Session Bean
| package com.toolsforjobs.j2ee.test.server;
|
| import javax.ejb.Stateless;
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
|
| import com.toolsforjobs.j2ee.test.server.domain.Debtor;
|
| @Stateless
| public class DebtorAgentBean implements DebtorAgentRemote {
|
| @PersistenceContext(unitName="tfj-dbs") EntityManager manager;
|
| public Debtor findDebtor(int id) {
| return manager.find(Debtor.class, id);
| }
|
| public void saveDebtor(Debtor deb) {
| manager.persist(deb);
| }
|
| }
|
And the calling client
| package com.toolsforjobs.j2ee.test.client;
|
| import javax.naming.Context;
| import javax.rmi.PortableRemoteObject;
|
| import com.toolsforjobs.j2ee.test.server.DebtorAgentRemote;
| import com.toolsforjobs.j2ee.test.server.domain.Address;
| import com.toolsforjobs.j2ee.test.server.domain.Debtor;
|
| public class DebtorClient {
| public static void main(String[] args) {
| try {
| Context jndiContext = getInitialContext();
| Object ref =
jndiContext.lookup("DebtorAgentBean/remote");
| DebtorAgentRemote dao = (DebtorAgentRemote)
PortableRemoteObject.narrow(ref, DebtorAgentRemote.class);
|
| Debtor deb1 = new Debtor();
| deb1.setId(1);
| deb1.setBalance(100.0d);
| deb1.setIdAtCustomer("toolsforjobs");
|
| dao.saveDebtor(deb1);
| } catch (javax.naming.NamingException ne) {
| ne.printStackTrace();
| }
| }
|
| public static Context getInitialContext() throws
javax.naming.NamingException {
| return new javax.naming.InitialContext();
| }
| }
|
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