hibernate-issues

[Hibernate-issues] [Hibernate-JIRA] Created: (EJB-192) Serialization exception with hashCode() and eager-eager

[Stefan N. (JIRA) <no...@at...>]

Serialization exception with hashCode() and eager-eager
-------------------------------------------------------

         Key: EJB-192
         URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-192
     Project: Hibernate Entity Manager
        Type: Bug

  Components: EntityManager  
    Versions: 3.2.0.cr1    
 Environment: JBoss 4.0.4.GA-patch1  and SUN JDK 1.5.0_07 on Windows XP
    Reporter: Stefan Norberg


I have a problem with some weird stuff going on when I implement the equals()/hashCode() methods in my entites. The short version is that I get a NullPointerException on deserialization on the client side after a remote server request when I am using eager fetching in both Team and Player. If I set the player-> team to lazy it works.

More details are on the Hibernate forum:
http://forum.hibernate.org/viewtopic.php?p=2308640#2308640

I'm going to post the test case here tomorrow when I get the code from work.

All the fields in the entity are null when the the object hits the deserialization code and hence the exception... But the name is of course initialized when shown in my test case app later. What gives? Seems to me the deserialization is broken. Perhaps this is a bug in JBoss remoting, but since I can only get this with the Entity Manager I posted here. 

This workaround works fine I think, but something seems terribly broken in either Hibernate or Jboss (remoting?).

public boolean equals(Object obj) {
if (name == null) return super.equals(obj);
if (obj instanceof Team) {
Team other = (Team) obj;
return other.getName().equals(this.getName());
}
return false;
}

public int hashCode() {
if (name == null) return super.hashCode(obj);
return name.hashCode();
}

Full stack trace of any exception that occurs:

javax.ejb.EJBException: java.lang.NullPointerException
   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:412)
   at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
Caused by: java.lang.NullPointerException
   at com.weirdstuff.Player.hashCode(Player.java:83)
   at java.util.HashMap.hash(HashMap.java:264)
   at java.util.HashMap.put(HashMap.java:382)
   at java.util.HashSet.add(HashSet.java:194)
   at java.util.AbstractCollection.addAll(AbstractCollection.java:318)
   at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:273)
   at org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183)
   at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268)
   at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249)
   at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:866)
   at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:853)
   at org.hibernate.loader.Loader.doQuery(Loader.java:717)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
   at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
   at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
   at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
   at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2821)
   at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:370)
   at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:351)
   at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:122)
   at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:178)
   at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:86)
   at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:871)
   at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:839)
   at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
   at org.hibernate.type.EntityType.resolve(EntityType.java:303)
   at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
   at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
   at org.hibernate.loader.Loader.doQuery(Loader.java:717)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
   at org.hibernate.loader.Loader.doList(Loader.java:2145)
   at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
   at org.hibernate.loader.Loader.list(Loader.java:2024)
   at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:392)
   at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:333)
   at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
   at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114)
   at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
   at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:53)
   at com.weirdstuff.FacadeBean.getPlayers(FacadeBean.java:17)
   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:585)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
   at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
   at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
   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:412)
   at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
   at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
   at org.jboss.remoting.Client.invoke(Client.java:525)
   at org.jboss.remoting.Client.invoke(Client.java:488)
   at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
   at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
   at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
   at $Proxy0.getPlayers(Unknown Source)
   at com.weirdstuff.TestHashCodeClient.testGetPlayer(TestHashCodeClient.java:51)
   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:585)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at junit.framework.TestSuite.runTest(TestSuite.java:208)
   at junit.framework.TestSuite.run(TestSuite.java:203)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) 

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[Hibernate-issues] [Hibernate-JIRA] Commented: (EJB-192) Serialization exception with hashCode() and eager-eager

[Stefan N. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-192?page=comments#action_23261 ] 

Stefan Norberg commented on EJB-192:
------------------------------------

Client that calls a slsb on the Jboss server:

public class TestHashCodeClient extends TestCase {

   Facade facade = null; 
   public TestHashCodeClient(String name) {
      super(name);
      
   }
   
   @Override
   protected void setUp() throws Exception {
      super.setUp();
      Properties properties = new Properties();
      properties.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
      properties.put("java.naming.factory.url.pkgs","=org.jboss.naming:org.jnp.interfaces");
      properties.put("java.naming.provider.url","localhost:1099");
      InitialContext ctx = new InitialContext(properties);
      facade   =  (Facade) ctx.lookup( Facade.class.getSimpleName()+ "Bean/remote");
   }
   
   public void testUpdatePlayer() {
      Set<Player> players = new HashSet<Player>();
      players.add(new Player("Player1"));
      players.add(new Player("Player2"));
      players.add(new Player("Player3"));
      Team t1 = new Team("Team1");
      for (Player p : players) {
         p.setTeam(t1);
      }
      t1.setPlayers(players);
      facade.updateTeam(t1);
   }
   
   public void testGetPlayer() throws Exception {
      for (Player p : facade.getPlayers()) {
         System.out.println(p.getFullName());
      }
   }


The stateless session bean:

public @Stateless class FacadeBean implements Facade {
   
   @PersistenceContext
   EntityManager em;

   public List<Player> getPlayers() {
      Query q = em.createQuery("select p from Player p");
      return q.getResultList();
   }

   public void updateTeam(Team  t) {
      em.merge(t);
   }
}


Two entity classes: Team and Player:


@Entity
public class Team implements Serializable {
   private static final long serialVersionUID = 1L;

   private Long id;

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   /** Optimistic locking */
   private Integer version;

   @Version
   public Integer getVersion() {
      return version;
   }

   public void setVersion(Integer version) {
      this.version = version;
   }

   public Team() {

   }

   public Team(String name) {
      setName(name);
   }

   private String name;

   @Basic
   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   private Set<Player> players = new HashSet<Player>();

   @OneToMany(fetch = FetchType.EAGER, mappedBy = "team")
   @Cascade( { org.hibernate.annotations.CascadeType.ALL,
         org.hibernate.annotations.CascadeType.DELETE_ORPHAN })
   public Set<Player> getPlayers() {
      return players;
   }

   public void setPlayers(Set<Player> players) {
      this.players = players;
   }

   public String toString() {
      return name;
   }

   public boolean equals(Object obj) {
      if (obj instanceof Team) {
         Team other = (Team) obj;
         return other.getName().equals(this.getName());
      }
      return false;
   }

   public int hashCode() {
      return name.hashCode();
   }
}

@Entity
public class Player implements Serializable {
   private static final long serialVersionUID = 1L;

   private Long id;

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   /** Optimistic locking */
   private Integer version;

   @Version
   public Integer getVersion() {
      return version;
   }

   public void setVersion(Integer version) {
      this.version = version;
   }

   public Player() {

   }

   public Player(String name) {
      setFullName(name);
   }

   private String fullName;

   public String getFullName() {
      return fullName;
   }

   public void setFullName(String name) {
      this.fullName = name;
   }

   private Team team;

   @ManyToOne(fetch = FetchType.EAGER)
   public Team getTeam() {
      return team;
   }

   public void setTeam(Team team) {
      this.team = team;
   }

   public String toString() {
      return fullName;
   }

   public boolean equals(Object obj) {
      if (obj instanceof Player) {
         Player other = (Player) obj;
         return other.getFullName().equals(this.getFullName());
      }
      return false;
   }

   public int hashCode() {
      return fullName.hashCode();
   }
} 

> Serialization exception with hashCode() and eager-eager
> -------------------------------------------------------
>
>          Key: EJB-192
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-192
>      Project: Hibernate Entity Manager
>         Type: Bug

>   Components: EntityManager
>     Versions: 3.2.0.cr1
>  Environment: JBoss 4.0.4.GA-patch1  and SUN JDK 1.5.0_07 on Windows XP
>     Reporter: Stefan Norberg

>
>
> I have a problem with some weird stuff going on when I implement the equals()/hashCode() methods in my entites. The short version is that I get a NullPointerException on deserialization on the client side after a remote server request when I am using eager fetching in both Team and Player. If I set the player-> team to lazy it works.
> More details are on the Hibernate forum:
> http://forum.hibernate.org/viewtopic.php?p=2308640#2308640
> I'm going to post the test case here tomorrow when I get the code from work.
> All the fields in the entity are null when the the object hits the deserialization code and hence the exception... But the name is of course initialized when shown in my test case app later. What gives? Seems to me the deserialization is broken. Perhaps this is a bug in JBoss remoting, but since I can only get this with the Entity Manager I posted here. 
> This workaround works fine I think, but something seems terribly broken in either Hibernate or Jboss (remoting?).
> public boolean equals(Object obj) {
> if (name == null) return super.equals(obj);
> if (obj instanceof Team) {
> Team other = (Team) obj;
> return other.getName().equals(this.getName());
> }
> return false;
> }
> public int hashCode() {
> if (name == null) return super.hashCode(obj);
> return name.hashCode();
> }
> Full stack trace of any exception that occurs:
> javax.ejb.EJBException: java.lang.NullPointerException
>    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:412)
>    at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
> Caused by: java.lang.NullPointerException
>    at com.weirdstuff.Player.hashCode(Player.java:83)
>    at java.util.HashMap.hash(HashMap.java:264)
>    at java.util.HashMap.put(HashMap.java:382)
>    at java.util.HashSet.add(HashSet.java:194)
>    at java.util.AbstractCollection.addAll(AbstractCollection.java:318)
>    at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:273)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249)
>    at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:866)
>    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:853)
>    at org.hibernate.loader.Loader.doQuery(Loader.java:717)
>    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
>    at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
>    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
>    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
>    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2821)
>    at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:370)
>    at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:351)
>    at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:122)
>    at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:178)
>    at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:86)
>    at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:871)
>    at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:839)
>    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
>    at org.hibernate.type.EntityType.resolve(EntityType.java:303)
>    at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
>    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
>    at org.hibernate.loader.Loader.doQuery(Loader.java:717)
>    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
>    at org.hibernate.loader.Loader.doList(Loader.java:2145)
>    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
>    at org.hibernate.loader.Loader.list(Loader.java:2024)
>    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:392)
>    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:333)
>    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
>    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114)
>    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
>    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:53)
>    at com.weirdstuff.FacadeBean.getPlayers(FacadeBean.java:17)
>    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:585)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
>    at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
>    at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
>    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:412)
>    at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
>    at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
>    at org.jboss.remoting.Client.invoke(Client.java:525)
>    at org.jboss.remoting.Client.invoke(Client.java:488)
>    at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
>    at $Proxy0.getPlayers(Unknown Source)
>    at com.weirdstuff.TestHashCodeClient.testGetPlayer(TestHashCodeClient.java:51)
>    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:585)
>    at junit.framework.TestCase.runTest(TestCase.java:154)
>    at junit.framework.TestCase.runBare(TestCase.java:127)
>    at junit.framework.TestResult$1.protect(TestResult.java:106)
>    at junit.framework.TestResult.runProtected(TestResult.java:124)
>    at junit.framework.TestResult.run(TestResult.java:109)
>    at junit.framework.TestCase.run(TestCase.java:118)
>    at junit.framework.TestSuite.runTest(TestSuite.java:208)
>    at junit.framework.TestSuite.run(TestSuite.java:203)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) 

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[Hibernate-issues] [Hibernate-JIRA] Updated: (EJB-192) Serialization exception with hashCode() and eager-eager

[Stefan N. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-192?page=all ]

Stefan Norberg updated EJB-192:
-------------------------------

    Attachment: eager-eager.jar

A simple EJB3 app with a client reproducing this issue.

> Serialization exception with hashCode() and eager-eager
> -------------------------------------------------------
>
>          Key: EJB-192
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-192
>      Project: Hibernate Entity Manager
>         Type: Bug

>   Components: EntityManager
>     Versions: 3.2.0.cr1
>  Environment: JBoss 4.0.4.GA-patch1  and SUN JDK 1.5.0_07 on Windows XP
>     Reporter: Stefan Norberg
>  Attachments: eager-eager.jar
>
>
> I have a problem with some weird stuff going on when I implement the equals()/hashCode() methods in my entites. The short version is that I get a NullPointerException on deserialization on the client side after a remote server request when I am using eager fetching in both Team and Player. If I set the player-> team to lazy it works.
> More details are on the Hibernate forum:
> http://forum.hibernate.org/viewtopic.php?p=2308640#2308640
> I'm going to post the test case here tomorrow when I get the code from work.
> All the fields in the entity are null when the the object hits the deserialization code and hence the exception... But the name is of course initialized when shown in my test case app later. What gives? Seems to me the deserialization is broken. Perhaps this is a bug in JBoss remoting, but since I can only get this with the Entity Manager I posted here. 
> This workaround works fine I think, but something seems terribly broken in either Hibernate or Jboss (remoting?).
> public boolean equals(Object obj) {
> if (name == null) return super.equals(obj);
> if (obj instanceof Team) {
> Team other = (Team) obj;
> return other.getName().equals(this.getName());
> }
> return false;
> }
> public int hashCode() {
> if (name == null) return super.hashCode(obj);
> return name.hashCode();
> }
> Full stack trace of any exception that occurs:
> javax.ejb.EJBException: java.lang.NullPointerException
>    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:412)
>    at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
> Caused by: java.lang.NullPointerException
>    at com.weirdstuff.Player.hashCode(Player.java:83)
>    at java.util.HashMap.hash(HashMap.java:264)
>    at java.util.HashMap.put(HashMap.java:382)
>    at java.util.HashSet.add(HashSet.java:194)
>    at java.util.AbstractCollection.addAll(AbstractCollection.java:318)
>    at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:273)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268)
>    at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249)
>    at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:866)
>    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:853)
>    at org.hibernate.loader.Loader.doQuery(Loader.java:717)
>    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
>    at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
>    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
>    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
>    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2821)
>    at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:370)
>    at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:351)
>    at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:122)
>    at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:178)
>    at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:86)
>    at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:871)
>    at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:839)
>    at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
>    at org.hibernate.type.EntityType.resolve(EntityType.java:303)
>    at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
>    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
>    at org.hibernate.loader.Loader.doQuery(Loader.java:717)
>    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
>    at org.hibernate.loader.Loader.doList(Loader.java:2145)
>    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
>    at org.hibernate.loader.Loader.list(Loader.java:2024)
>    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:392)
>    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:333)
>    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
>    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114)
>    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
>    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:53)
>    at com.weirdstuff.FacadeBean.getPlayers(FacadeBean.java:17)
>    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:585)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
>    at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
>    at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
>    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:412)
>    at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
>    at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:190)
>    at org.jboss.remoting.Client.invoke(Client.java:525)
>    at org.jboss.remoting.Client.invoke(Client.java:488)
>    at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
>    at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
>    at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
>    at $Proxy0.getPlayers(Unknown Source)
>    at com.weirdstuff.TestHashCodeClient.testGetPlayer(TestHashCodeClient.java:51)
>    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:585)
>    at junit.framework.TestCase.runTest(TestCase.java:154)
>    at junit.framework.TestCase.runBare(TestCase.java:127)
>    at junit.framework.TestResult$1.protect(TestResult.java:106)
>    at junit.framework.TestResult.runProtected(TestResult.java:124)
>    at junit.framework.TestResult.run(TestResult.java:109)
>    at junit.framework.TestCase.run(TestCase.java:118)
>    at junit.framework.TestSuite.runTest(TestSuite.java:208)
>    at junit.framework.TestSuite.run(TestSuite.java:203)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) 

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