Hi folks,
I am using JDK 1.3 on NT and the JBoss 2.0.PR3 distribution. I am having
finder method problems with my Entity Beans that use inheritance.
The home interface on an entity bean we'll call BeanAHome extends a
BaseEJBHome interface that in turn extends EJBHome.
The remote interface on an entity bean we'll call BeanA extends a
BaseEJBObject interface that in turn extends EJBObject.
This is what the interfaces look like:
public interface BaseEJBObject
extends EJBObject
{
public int getType();
public BaseData getData();
}
public interface BeanA
extends BaseEJBObject
{
// possible business methods
}
public interface BaseEJBHome
extends EJBHome
{
public BaseEJBObject create(BaseData data)
throws RemoteException, CreateException;
public BaseEJBObject findByPrimaryKey(BaseKey key)
throws RemoteException, FinderException;
}
public interface BeanAHome
extends BaseEJBHome
{
// possible finder methods
}
After the Bean has been successfully deployed, an attempt to obtain the
remote interface throws a RemoteException.
{
BaseEJBHome baseHome =
(BaseEJBHome)Naming.lookupObjec("com.expressware.matex.entity.beana");
BaseEJBObject baseObject = baseHome.findByPrimaryKey(key);
}
The problem could be in EntityContainer.java on line 369.
if (!mi.getMethod().getReturnType().equals(getRemoteClass()))
In this case getReturnType() returns the Class Object for BaseEJBObject,
however I think the getRemoteClass() returns the Class Object for BeanA and
since
they are not equal, the function continues on to perform a mutiple find and
gives the error shown further below. Shouldn't the check that determines
whether to perform a multiple or single
find honor the class hierarchy. In other words shoudn't it know that BeanA
inherits from BaseEJBObject and hence call the Single Entity Finder.
At least that was the way it was working with EJBoss 1.0 PR2. Can somebody
tell me if I am doing things right? The stack trace is below.
Thanks,
Lance Hale
ExpressWare
[com.expressware.matex.entity.user] java.rmi.RemoteException: result of
finder method is not a valid return type: class
com.expressware.matex.business.entity.us
er.UserKey
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.BMPPersistenceManager.findEntities(BMPPersistenceManag
er.java, Compiled Code)
[com.expressware.matex.entity.user] at
org.jboss.ejb.EntityContainer.find(EntityContainer.java:369)
[com.expressware.matex.entity.user] at
java.lang.reflect.Method.invoke(Native Method)
[com.expressware.matex.entity.user] at
org.jboss.ejb.EntityContainer$ContainerInterceptor.invokeHome(EntityContaine
r.java:586)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invokeHome(EntitySync
hronizationInterceptor.java:147)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome(EntityInstanceInt
erceptor.java:77)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.TxInterceptor$RunInvokeHome.run(TxInterceptor.java:500
)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.TxInterceptor.runWithTransactions(TxInterceptor.java:2
89)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.TxInterceptor.invokeHome(TxInterceptor.java:86)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.jav
a:75)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java,
Compiled Code)
[com.expressware.matex.entity.user] at
org.jboss.ejb.EntityContainer.invokeHome(EntityContainer.java:308)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invokeHome(JRMPContai
nerInvoker.java:169)
[com.expressware.matex.entity.user] at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker.invokeHome(JRMPContai
nerInvoker.java:132)
[com.expressware.matex.entity.user] at
java.lang.reflect.Method.invoke(Native Method)
[com.expressware.matex.entity.user] at
sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java, Compiled
Code)
[com.expressware.matex.entity.user] at
sun.rmi.transport.Transport$1.run(Transport.java, Compiled Code)
[com.expressware.matex.entity.user] at
java.security.AccessController.doPrivileged(Native Method)
[com.expressware.matex.entity.user] at
sun.rmi.transport.Transport.serviceCall(Transport.java, Compiled Code)
[com.expressware.matex.entity.user] at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:422)
[com.expressware.matex.entity.user] at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:6
34)
[com.expressware.matex.entity.user] at java.lang.Thread.run(Thread.java,
Compiled Code)
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