HTTP 501 for java.lang.UnsupportedOperationException

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I have a generic REST service layer written to Java modules which can be plugged in. If any of the desired operation is not supported by a Module (GET/POST/PUT/DELETE of a Resource), the module throws java.lang.UnsupportedOperationException or an equivalent Exception Type that I have.

So, can I return a HTTP 501 Error Code to the client in this case?

A request was made of a resource using a request method not supported by that resource; for example, using GET on a form which requires data to be presented via POST, or using PUT on a read-only resource.

501 is reasonable:

The server either does not recognise the request method , or it lacks the ability to fulfill the request.

but I would keep it for operations that you plan to implement in the near future.

Thanks Tomas. Just to clarify, if a client is trying to create a resource /rest/module_name/Person and create() is not supported by the module identified by "module_name", it is treated as a client request problem and thrown a 405 rather than a server side problem by returning 501? The reason I ask is that, 4XX are client related error codes whilst 5XX are server related. – Anil G Jul 10, 2012 at 7:40 @BlueDiamond: well, is it you (API provider) doing something wrong (5xx) or the client is using the API incorrectly (4xx)? – Tomasz Nurkiewicz Jul 10, 2012 at 7:47

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