Catch Rest Exception on Client

Question

I have an exception that I throw from the server side that I wish to catch on the client side. The exception should be sent over REST using Jersey. This is what I have so far:

Define my Exception:

public class MyException extends Exception implements Serializable {

    private static final long serialVersionUID = 1L;

    public MyException () {
        super();
    }
    public MyException (String msg)   {
        super(msg);
    }
    public MyException (String msg, Exception e)  {
        super(msg, e);
    }
}

Define my exception in a class which implements the ExceptionMapper:

@Provider
public class TestMapper implements ExceptionMapper<MyException> {

    @Override
    public Response toResponse(MyExceptionexception){
        return Response.status(Status.BAD_REQUEST).entity(exception.getMessage()).build(); 
    }
}

This is my resource class, where the request from the server goes into:

@PUT
@Path("calculate")
public void calculateMethod(String id) throws MyException{
   //Other code...
    throw new MyException("custom error message string");
    }       
}

And finally, from the client side makes the REST call as follows:

public void calculateMethodClient(String id) throws MyException{
    client().put("/test/", "calculate", id);
}

When this client method gets called, I have surrounded with Try/Catch to test:

public boolean testClient(){
    try {
        client.calculateMethodClient((String) id);
        return true;
    } catch (MyException) {
        return false;
    } catch (UniformInterfaceException e){
        return false;
    }
}

I have put a breakpoint in both catch blocks but it only ever hits the UniformInterfaceException catch. This is not what I want as the server side can fail for a variety of reasons and I want to be able to define the error message in 'MyException' each time.

Could someone please explain how I can get this to work?

Sudhanshu Umalkar Sudhanshu Umalkar · Accepted Answer · 2014-01-22T10:33:57

You need to check the status code at the client side, and if its a bad request, then throw the exception there along with the exception message that you got from the server.

Catch Rest Exception on Client

1 Answers