Hi

I've been struggling with this problem a couple of days and still haven't been able to find any solutions. It's about two simple entities that have a ManyToOne relationship. The following exception is thrown when the owning entity is looked up:

java.lang.NoClassDefFoundError: Lorg/hibernate/type/AbstractComponentType;
 at java.lang.Class.getDeclaredFields0(Native Method)
 at java.lang.Class.privateGetDeclaredFields(Class.java:2259)
 at java.lang.Class.getDeclaredField(Class.java:1852)
 at java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1582)
 at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:52)
 at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:400)
 at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:297)
 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
 at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:122)
 at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
 at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObjectVersion2_2(JavaSerializationManager.java:239)
 at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:133)
 at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:120)
 at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedRead(MicroSocketClientInvoker.java:957)
 at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:586)
 at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122)
 at org.jboss.remoting.Client.invoke(Client.java:1634)
 at org.jboss.remoting.Client.invoke(Client.java:548)
 at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:62)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
 at $Proxy13.get(Unknown Source)
 at com.lab.service.LabTest.testGetAnimal(LabTest.java:55)

Here are the entities involved:

@Entity
@Table(name = "ANIMAL")
public class Animal implements Serializable {
 private long id;

 private Farm farm;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 @Column(name = "ID")
 public long getId() {
 return id;
 }

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

 @ManyToOne(fetch = FetchType.LAZY)
 @JoinColumn(name="FARM_ID")
 public Farm getFarm() {
 return farm;
 }

 public void setFarm(Farm farm) {
 this.farm = farm;
 }
}

@Entity
@Table(name = "FARM")
public class Farm implements Serializable {
 private long id;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 @Column(name = "ID")
 public long getId() {
 return id;
 }

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

An the test case simply looks up the entity through EntityManager:

 @PersistenceContext
 protected EntityManager em;

 public <T> T get(Class<T> klass, long id) {
 return em.find(klass, id);
 }

The strangest thing is that there are very few people ran into this problem. For what it's worth, the correct lookup query - considering being lazy - comes up in the hibernate logs:

select animal0_.ID as ID75_0_, animal0_.FARM_ID as FARM2_75_0_ from ANIMAL animal0_ where animal0_.ID=?

I appreciate any ideas on this.