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From "Jim Newsham (JIRA)" <j...@apache.org>
Subject [jira] Created: (CAMEL-3025) ProxyHelper bean proxy should unwrap "cause" from RuntimeCamelException if the cause's type is declared thrown by the proxied method
Date Fri, 06 Aug 2010 01:37:18 GMT
ProxyHelper bean proxy should unwrap "cause" from RuntimeCamelException if the cause's type
is declared thrown by the proxied method
------------------------------------------------------------------------------------------------------------------------------------

                 Key: CAMEL-3025
                 URL: https://issues.apache.org/activemq/browse/CAMEL-3025
             Project: Apache Camel
          Issue Type: Improvement
          Components: bean-integration
            Reporter: Jim Newsham


ProxyHelper allows one to create a local proxy which invokes a method call on a remote bean
by marshalling the request into a message object, sending the message, waiting for the result,
unmarshalling the result, and returning the result to the caller.  On the remote end, a bean
invocation must be set up to handle the invocation.  Consider the following service bean and
proxy usage:

public interface MyService {

  public Result method() throws MyApplicationException;

}

MyService myService = ProxyHelper.createProxy(endpoint, MyService.class);

try {
  Result = myService.method();
}
catch(MyApplicationException mae) {
  ...
}

MyApplicationException is an application-level exception which should be handled by the caller.
 The user of the proxy expects that if the remote invocation of MyService.method() fails with
a MyApplicationException, that the same exception should be thrown by the proxy instance.
 Instead, the proxy instance is currently throwing a CamelRuntimeException which wraps the
original MyApplicationException.  I propose that the proxy invocation handler used by ProxyHelper
should check if the wrapped "cause" is of one of the declared exception types of the method
being proxied, and if so, to unwrap and throw that exception instead of the CamelRuntimeException.

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