exception_exception.html

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<TITLE>Throwing an Exception from a Remote Method
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  <h3>
    e192.  
    Throwing an Exception from a Remote Method</h3>

1. Define the remote interface.

<pre>
    import java.rmi.*;
    
    public interface <font color="#0066ff"><i>RObject</i></font> extends Remote {
        void <font color="#0066ff"><i>aMethod</i></font>() throws RemoteException;
    }
</pre>
2. Define the remote object implementation.

<pre>
    import java.rmi.*;
    import java.rmi.server.UnicastRemoteObject;
    
    public class <font color="#0066ff"><i>RObjectImpl</i></font> extends UnicastRemoteObject implements <font color="#0066ff"><i>RObject</i></font> {
        public <font color="#0066ff"><i>RObjectImpl</i></font>() throws RemoteException {
            super();
        }
        public void <font color="#0066ff"><i>aMethod</i></font>() throws RemoteException {
            // The actual exception must be wrapped in a RemoteException
            throw new RemoteException(<font color="#0066ff"><i>"message"</i></font>, new <font color="#0066ff"><i>FileNotFoundException</i></font>(<font color="#0066ff"><i>"message"</i></font>));
        }
    }
</pre>
3. Compile the remote object implementation.

<pre>
    &gt; javac <font color="#0066ff"><i>RObject</i></font>.java <font color="#0066ff"><i>RObjectImpl</i></font>.java
</pre>
4. Generate the skeletons and stubs.

<pre>
    &gt; rmic <font color="#0066ff"><i>RObjectImpl</i></font>

</pre>
5. Create an instance of the remote object and bind it to the RMI registry.

<pre>
    try {
        <font color="#0066ff"><i>RObject</i></font> robj = new <font color="#0066ff"><i>RObjectImpl</i></font>();
        Naming.rebind("//localhost/<font color="#0066ff"><i>RObjectServer</i></font>", robj);
    } catch (MalformedURLException e) {
    } catch (UnknownHostException e) {
    } catch (RemoteException e) {
    }
</pre>
6. Look up the remote object, invoke the method, and catch the exception.

<pre>
    try {
        // Look up the remote object.
        <font color="#0066ff"><i>RObject</i></font> robj = (<font color="#0066ff"><i>RObject</i></font>) Naming.lookup(<font color="#0066ff"><i>"//localhost/RObjectServer"</i></font>);
    
        // Invoke the method.
        robj.<font color="#0066ff"><i>aMethod</i></font>();
    } catch (MalformedURLException e) {
    } catch (UnknownHostException e) {
    } catch (NotBoundException e) {
    } catch (RemoteException e) {
        // Get the actual exception that was thrown.
        Throwable realException = e.detail;
    }
</pre>
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            &nbsp;Related Examples
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e187. <a class="eglink" href="StartRegistry.html?l=rel">
    Starting the RMI Registry
</a>
<br>

e188. <a class="eglink" href="DefineRemote.html?l=rel">
    Defining and Exporting a Remote Object
</a>
<br>

e189. <a class="eglink" href="LookupRemote.html?l=rel">
    Looking Up a Remote Object and Invoking a Method
</a>
<br>

e190. <a class="eglink" href="args_Args.html?l=rel">
    Passing Parameters to a Remote Method
</a>
<br>

e191. <a class="eglink" href="return_Return.html?l=rel">
    Returning Values from a Remote Method
</a>
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