ClassCastException EJB3 wrapped local object.

[hurzeler]

Hello there,

I have the following issue. I have a Stateless session bean called SiteDAOBean. This bean has a method:

public void update(Site site) throws PersistenceException
 {
 em.merge(site);
 }

Which works nicely if I call it remotely with a Site argument. However due to some extra functionallity that I need locally I have to wrap the Site class by extending it to SelectableSite. It then has a couple more methods that are only used locally and a field that is transient but it is still fundamentally a Site class.

Calling:

SiteDAO siteDAO = (SiteDAO) context.lookup(SiteDAOBean.class
 .getSimpleName()
 + "/remote");
siteDAO.update(site);

I get the following exception:

Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: mhl.edm.util.SelectableSite (no security manager: RMI class loader disabled)
 at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:371)
 at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
 at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
 at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
 at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1544)
 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.readArray(ObjectInputStream.java:1634)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
 at java.rmi.MarshalledObject.get(MarshalledObject.java:135)
 at org.jboss.aop.joinpoint.MethodInvocation.getArguments(MethodInvocation.java:267)
 ... 102 more

Obviously I need to cast the SelectableSite back to Site so that RMI does not complain not finding the class remotely.

I tried:

siteDAO.update((Site)site);

but that does not work. Can anyone tell me how to overcome this issue short from creating a new Site object?

Thanks for your help.

[alexg79]

Unfortunately you will have to either deploy the SelectableSite class on the server, or create a new Site to send to the server.

[hurzeler]

Now this is really ugly. The server should know nothing about this SelectableSite class and to recreate a new object for an object that is effectively already what we need is crazy.

Does that mean RMI is not perfect. What is the reason for this requirement??

[alexg79]

What is the reason for this requirement??

Since you are passing a SelectableSite object and not a Site object, the marshalling/unmarshalling procedure of RMI involves reflectively reconstructing said object on the server, which requires the class of that object to be available.