Oracle® Containers for J2EE Enterprise JavaBeans Developer's Guide 10g (10.1.3.5.0) Part Number E13981-01 |
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The component interfaces define the business methods of the bean that a client can invoke.
The remote interface defines the business methods that a remote client can invoke. The requirements for developing the remote component interface include: the following
The remote component interface of the bean must extend the javax.ejb.EJBObject
interface, and its methods must throw the java.rmi.RemoteException
exception.
You must declare the remote interface and its methods as public
for remote clients.
The remote component interface, all its method parameters, and return types must be serializable. In general, any object that is passed between the client and the EJB must be serializable, because RMI marshals and unmarshalls the object on both ends.
Any exception can be thrown to the client, as long as it is serializable. Run-time exceptions, including EJBException
and RemoteException
, are transferred back to the client as remote run-time exceptions.
Example 11-9 shows a remote component interface called Hello
with its defined methods, each of which will be implemented in the corresponding session bean.
The local component interface defines the business methods of the bean that a local (collocated) client can invoke. The requirements for developing the local component interface include the following:
The local component interface of the bean must extend the javax.ejb.EJBLocalObject
interface.
You declare the local component interface and its methods as public
.
Example 11-10 shows a local component interface called HelloLocal
with its defined methods, each of which will be implemented in the corresponding session bean.