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Asked: 2026-06-07T08:18:24+00:00

I have a generic REST service layer written to Java modules which can be

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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?

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  1. Editorial Team

    In this case you should use 405 Method Not Allowed (all quotes from Wikipedia):

    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.

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