cmp2.0 relation
Hi
I try to connect two cmp ejbs with a relation. After quite some try and error I managed to get it compiled and deployed. I can use both beans and I see the foreign key field in the database, but when I try to use the relation I get an exception of some proxy. I'm quite new at this and therefore really don't get what jboss is trying to tell me.
I add the relevant pieces of code and the error message at the end.
Evironment:
Suse linux 8.0
JBoss 3.0.2
Sun JDK 1.4.0
The whole thing is based on the template project
TIA
Spieler
------ Error Message of jboss ---------------------
19:06:37,943 ERROR [LogInterceptor] EJBException, causedBy:
java.lang.ClassCastException: $Proxy181
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.setInstanceValue(JDBCCMRFieldBridge.java:544)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge.setValue(JDBCCMRFieldBridge.java:483)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke(EntityBridgeInvocationHandler.java:125)
at org.jboss.proxy.compiler.Runtime.invoke(Runtime.java:59)
at de.lineas.evaluator.entity.PropertyCMP$Proxy.setEvaluation()
at de.lineas.evaluator.entity.PropertyBean.ejbPostCreate(PropertyBean.java:212)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
at java.lang.reflect.Method.invoke(Method.java:327)
at org.jboss.ejb.plugins.CMPPersistenceManager.postCreateEntity(CMPPersistenceManager.java:284)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.postCreateEntity(CachedConnectionInterceptor.java:278)
at org.jboss.ejb.EntityContainer.postCreateHome(EntityContainer.java:716)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:42)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
at java.lang.reflect.Method.invoke(Method.java:327)
at org.jboss.ejb.EntityContainer$ContainerInterceptor.invoke(EntityContainer.java:1170)
at org.jboss.ejb.plugins.cmp.jdbc.JDBCRelationInterceptor.invoke(JDBCRelationInterceptor.java:95)
at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invoke(EntitySynchronizationInterceptor.java:308)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
at org.jboss.ejb.plugins.EntityInstanceInterceptor.invoke(EntityInstanceInterceptor.java:152)
at org.jboss.ejb.plugins.EntityLockInterceptor.invoke(EntityLockInterceptor.java:107)
at org.jboss.ejb.plugins.EntityCreationInterceptor.invokeHome(EntityCreationInterceptor.java:59)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:111)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:178)
at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:52)
at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:105)
at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:129)
at org.jboss.ejb.EntityContainer.invokeHome(EntityContainer.java:487)
at org.jboss.ejb.Container.invoke(Container.java:738)
at org.jboss.ejb.EntityContainer.invoke(EntityContainer.java:1055)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:370)
at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:28)
at java.lang.reflect.Method.invoke(Method.java:327)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:264)
at sun.rmi.transport.Transport$1.run(Transport.java:151)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:147)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:463)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
at java.lang.Thread.run(Thread.java:539)
-------- The one side of the relationship ---------
/**
* get the properties belonging to this evaluation
* @ejb:relation name="evaluation-property"
* role-name="evaluation"
*/
public abstract java.util.Collection getProperties();
/**
* set the evaluation to which this property belongs
*/
public abstract void setProperties(java.util.Collection properties);
-------- the one side of the relationship ---------
/**
* get the properties belonging to this evaluation
* @ejb:relation name="evaluation-property"
* role-name="evaluation"
*/
public abstract java.util.Collection getProperties();
/**
* set the evaluation to which this property belongs
*/
public abstract void setProperties(java.util.Collection properties);
--- in the ejbPostCreate method of the same class I set the relationship ------------------------
public void ejbPostCreate( String id, String description, Evaluation eval )
{
setEvaluation(eval);
}
------ finally the code calling all this -----
try {
InitialContext lContext = new InitialContext();
EvaluationHome evaluationHome = (EvaluationHome) lContext.lookup( "ejb/evaluator/Evaluation" );
Evaluation evaluation = evaluationHome.create("eid1", "First test Evaluation");
PropertyHome propertyHome = (PropertyHome) lContext.lookup( "ejb/evaluator/Property" );
Property property = propertyHome.create("pid1", "First test Property");
property = propertyHome.create("pid2", "Second test Property, first with evaluation", evaluation);
System.out.println("done");
} catch( Exception e ){
e.printStackTrace();
}