Head First EJB

Entity bean Remote component interface

package headfirst;

import javax.ejb.*;
import java.rmi.RemoteException;

public interface Customer extends EJBObject {

    public String getLastName() throws RemoteException;
    public void setLastName(String lastName) throws RemoteException;

    public String getFirstName() throws RemoteException;
    public void setFirstName(String firstName) throws RemoteException;

}

Rules for the Remote component interface

1. Import javax.ejb.* and java.rmi.RemoteException

2. Extend javax.ejb.EJBObject

3. Declare one or more business methods, that throw a RemoteException

   • Arguments and return types must be RMI-IIOP compatible (Serializable, primitive, Remote, or arrays or collections of any of those)

   • You can have overloaded methods

   • Each method must declare a RemoteException

   • You can declare your own application exceptions, but they must NOT be runtime exceptions (in other words, they must be compiler-checked exceptions—subclasses of Exception but not subclasses of RuntimeException)

   • Methods can have arbitrary names, as long as they don’t begin with “ejb”.