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Returning a handle to a stateful session bean

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I'm having a problem returning a handle to a stateful session bean. I'm using a service locator pattern to get the handle and then I store it in an HttpSession object in my servlet throug a Business Delegate. When I want to get the handle to the session bean again I call the service locator through my business delegate passing the handle id through to the getService(String id) method of my service locator:
public static EJBObject getService(String id) throws ServiceLocatorException {
if (id == null) {
throw new ServiceLocatorException("test");
try {
byte[] bytes = new String(id).getBytes();
InputStream io = new
ObjectInputStream os = new
javax.ejb.Handle handle =
return handle.getEJBObject();
} catch(Exception ex) {
throw new ServiceLocatorException("test");
The problem I have is that when it gets to the line
javax.ejb.Handle handle =
os.readObject() returns a class not found exception:
java.lang.ClassNotFoundException: com.waersystems.ejb.supplier._SupplierMaintenance_Stub
That is the correct stub for the session object and it exists in that package so why am I getting the exception? I'm using WSAD 5.
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