how to handle exceptions in ejb 3 based soap webservice

I am currently developing an EJB3 based SOAP webservice and I wonder what are the best practices to handles uncatched exceptions and return a well formated SOAP response to the client.

example:

@WebMethod
public SomeResponse processSomeService(
        @WebParam(name = "someParameters") SomeParameters someParameters)
{
     // the EJB do something with the parameters
     // and retrieve a response fot the client
     SomeResponse theResponse = this.doSomething(someParameters);

     return theResponse;
}

Do I have to catch generic exception like:

@WebMethod
public SomeResponse processSomeService(
        @WebParam(name = "someParameters") SomeParameters someParameters)
{
     // the EJB do something with the parameters
     /开发者_Python百科/ and retrieve a response to return to the client
     try
     {
         SomeResponse theResponse = this.doSomething(someParameters);
     }
     catch (Exception ex)
     {
         // log the exception
         logger.log(Level.SEVERE, "something is going wrong {0}", ex.getMessage());
         // get a generic error response not to let the
         // technical reason going to the client
         SomeResponse theResponse = SomeResponse.createError();
     }

     return theResponse;
}

Is there some kind of "best practice" in order to achieve this ?

Thank you

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It is not good practice to return the error in the response, SOAP defines a SOAP fault for handling the return of errors. As was pointed out by Michael Konietzka, the container can handle the exception thrown and convert it to a SOAP fault.

In your case though, it seems you would like to catch and log the exception first - throw a new EJBException wrapping the original exception.

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If you want to return a SOAP message in the event of an error, you'll have to create it. I wouldn't expect a container to know what you need.

I would say that your design is adequate. The one criticism I'd have is that you can't be specific about the nature of the error.

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No need to catch them, the ejb-container will handle this.

UPDATE regarding the comment #1 by Alexandre GUIDET

From the EJB 3.1 specification, Chapter 14.2.2 Exception Handling -> System Exception:

• If the bean method encounters a system exception or error, it should simply propagate the error from the bean method to the container (i.e., the bean method does not have to catch the exception).

• If the bean method performs an operation that results in a checked exception that the bean method cannot recover, the bean method should throw the javax.ejb.EJBException that wraps the original exception.

• Any other unexpected error conditions should be reported using the javax.ejb.EJBException.

So propagating the RuntimeException to the container is the way the EJB specification recommends.