tags:

views:

1043

answers:

2
Q: 

java.lang.UnsupportedOperationException in JPA transaction

I'm pretty sure that I'm not understanding something about JPA (I'm using OpenJPA) and it's causing this problem. I want to make a copy of a Job entity.

@Entity
@Table(name="Job")
public class Job implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int id;

    @ManyToOne
    private Job job;

    @OneToMany(fetch = FetchType.EAGER)
    private Set<Job> jobCollection;
    ...

    public Job getJob() {
         return this.job;
    }

    public void setJob(Job job) {
         this.job = job;
    }

    public Set<Job> getCopies() {
         return this.jobCollection;
    }

    public void setCopies(Set<Job> jobCollection) {
         this.jobCollection = jobCollection;
    }
}

Running the following code works as I would expect when creating the first copy.

public void testCopyJob(){
 Job job = jobManager.findJobById(100);
 Job jobWithCopies = null;
 try {
  jobWithCopies = jobManager.copyJob(job, "test copy");
 } catch (Exception e) {
  fail(e.getMessage());
 }
 Set<Job> copies = jobWithCopies.getCopies();
 assertEquals("num copies", 1, copies.size());

 //make a second copy
 Job jobWithCopies2 = null;
 try {
  jobWithCopies2 = jobManager.copyJob(jobWithCopies, "test copy");
  assertEquals("multiple copies", 2, jobWithCopies2.getCopies().size());
 } catch (Exception e) {
  e.printStackTrace();
  fail(e.getMessage());
 }
}

Attempting to create a second copy fails with...

[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R <openjpa-1.2.1-SNAPSHOT-r422266:686069 fatal general error> org.apache.openjpa.persistence.PersistenceException: null
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1688)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.StateManagerImpl.assignObjectId(StateManagerImpl.java:523)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.StateManagerImpl.assignField(StateManagerImpl.java:608)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1494)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1477)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at entities.Job.pcGetid(Job.java)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at entities.Job.hashCode(Job.java:402)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at java.util.HashMap.putImpl(Unknown Source)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at java.util.HashMap.put(Unknown Source)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at java.util.HashSet.add(Unknown Source)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.util.java$util$HashSet$proxy.add(Unknown Source)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at entities.controller.JobManager.copyJob(JobManager.java:140)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at entities.controller.JobManagerTest.testCopyJob(JobManagerTest.java:55)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:45)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at java.lang.reflect.Method.invoke(Method.java:599)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestCase.runTest(TestCase.java:154)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestCase.runBare(TestCase.java:127)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestResult$1.protect(TestResult.java:106)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestResult.runProtected(TestResult.java:124)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestResult.run(TestResult.java:109)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestCase.run(TestCase.java:118)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestSuite.runTest(TestSuite.java:208)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at junit.framework.TestSuite.run(TestSuite.java:203)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.cactus.server.runner.ServletTestRunner.run(ServletTestRunner.java:309)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.cactus.server.runner.ServletTestRunner.doGet_aroundBody0(ServletTestRunner.java:187)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.cactus.server.runner.ServletTestRunner.doGet_aroundBody1$advice(ServletTestRunner.java:225)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.cactus.server.runner.ServletTestRunner.doGet(ServletTestRunner.java:1)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1449)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:790)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:443)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:175)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3610)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:274)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:926)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1557)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:173)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:455)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:384)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:272)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:202)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:766)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:896)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1527)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R Caused by: java.lang.UnsupportedOperationException
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.DetachedStateManager.getMetaData(DetachedStateManager.java:696)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.strats.UntypedPCValueHandler.toRelationDataStoreValue(UntypedPCValueHandler.java:121)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.sql.RowImpl.setRelationId(RowImpl.java:327)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.sql.SecondaryRow.setRelationId(SecondaryRow.java:106)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.strats.HandlerStrategies.set(HandlerStrategies.java:150)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.strats.HandlerStrategies.set(HandlerStrategies.java:104)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.strats.HandlerCollectionTableFieldStrategy.insert(HandlerCollectionTableFieldStrategy.java:154)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.strats.HandlerCollectionTableFieldStrategy.insert(HandlerCollectionTableFieldStrategy.java:130)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.meta.FieldMapping.insert(FieldMapping.java:579)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.insert(AbstractUpdateManager.java:197)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.populateRowManager(AbstractUpdateManager.java:139)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.persistence.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:73)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at com.ibm.ws.persistence.jdbc.kernel.ConstraintUpdateManager.flush(ConstraintUpdateManager.java:60)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:655)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.DelegatingStoreManager.flush(DelegatingStoreManager.java:130)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2010)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:1908)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:1679)
[11/25/08 8:46:56:546 EST] 00000018 SystemErr     R     ... 52 more

This exception is thrown in the JobManager.copyJob() method (at line: attachedJob.getCopies().add(newJob);)...

@JPAManager(targetEntity=entities.Job.class)
public class JobManager {

      private EntityManager getEntityManager() {
              EntityManagerFactory emf = Persistence
                      .createEntityManagerFactory("import");
              return emf.createEntityManager();
      }

    @Action(Action.ACTION_TYPE.FIND)
    public Job findJobById(int id) {
            EntityManager em = getEntityManager();
            Job job = null;
            try {
               job = (Job) em.find(Job.class, id);
            } finally {
               em.close();
            }
            return job;
    }

    public Job copyJob(Job job, String newJobName) throws Exception {
            EntityManager em = getEntityManager();
            Job attachedJob = null;
            try {
                    em.getTransaction().begin();
                   //merge any changes made to job
                            attachedJob = em.merge(job);
                  //copy the job and establish bi-directional relationship
                            Job newJob = new Job(job);
                            newJob.setName(newJobName);
                            newJob.setJob(attachedJob);
                            em.persist(newJob);
                            attachedJob.getCopies().add(newJob);    
                  em.getTransaction().commit(); //commit changes to original job
             } catch (Exception ex) {
                    try {
                            if (em.getTransaction().isActive()) {
                                  em.getTransaction().rollback();
   }
                    } catch (Exception e) {
                            ex.printStackTrace();
                            throw e;
  }
                    throw ex;
             } finally {
                    em.close();
             }
            return attachedJob;
     }
}

This is the generated DB schema I'm using...

CREATE TABLE Job (id INTEGER NOT NULL GENERATED BY DEFAULT AS IDENTITY, JOB_ID INTEGER, PRIMARY KEY (id));
CREATE TABLE Job_jobCollection (JOB_ID INTEGER, element VARCHAR(254));
ALTER TABLE Job ADD FOREIGN KEY (JOB_ID) REFERENCES Job (id);
ALTER TABLE Job_jobCollection ADD FOREIGN KEY (JOB_ID) REFERENCES Job (id);

Looking at the OpenJPA 1.2 source code shows that the DetachedStateManager.getMetaData() method is not implemented so I'm wondering why it's being called. Any tips??

A: 

I'm not familiar with JPA and therefore I don't know if your JobManager is doing the wrong thing.

What will be really helpful is if you could provide a longer stacktrace so we can tell what led you to DetachedStateManager.getMetaData() and start from somewhere there.

yc

yclian  2008-11-24 23:37:53
I hope someone answers this question too...and explains what the "@ManyToOne private Job job;"means in the Job class. I don't see how there can be a "Many" relationship when the isn't some kind of Collection.
Randy Stegbauer  2008-11-25 02:09:16
+1  A: 

You don't show what your implementation of the copy constructor for Job is, but if you are copying the id from one Job as the id of the copy of that Job, then attempting to save the copy job will fail because JPA will know that the instance of Job with that Id lives in another object, and it is that original object that should be persisted.

It looks like your problem is actually in hashCode, though, and your sample shows that you don't have a hashCode implementation. It looks like openjpa instrumented you a hashCode implementation based on the value of Id. When you add something to a Set, the Set will call hashCode() on your object as part of the process of determining if the object is already in the Set.

I would try changing id from an int to an Integer (openjpa appears to be trying to assign from an object which might just be the boxed Integer). Or implement your own hashCode that just returns the value of Id.

Brian Deacon  2009-02-13 22:25:06

related questions

Java Time Zone is messed up
Eclipse on win64
Automate builds for Java RCP for deployment with JNLP
Why are professors or schools picking Java over C++ to teach to students?
Is there a real benefit of using J#?
Public/Popular Websites using JavaServer Faces
Why can't I use a try block around my super() call?
Accessing post variables using Java Servlets
Personal Linux web server
Is this really widening vs autoboxing?
How can I Java webstart multiple, dependent, native libraries?
Why can't I call toString() on a Java primitive?
How do I use Java to read from a file that is actively being written?
What code analysis tools do you use for your Java projects?
IllegalArgumentException or NullPointerException for a null parameter?
How do I configure and communicate with a serial port?
What is the best way to parse strings in Java
Getting started with a custom JXTA PeerGroup
Creating a custom button in Java
How to get started "writing" a code coverage tool?
Which Build-/Configuration Management Tool?
What is the difference between an int and an Integer in Java/C#?
What is the meaning of the type safety warning in certain Java generics casts?
How would you access Object properties from within an object method?
Converting CSV File to XML in Java