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I'm using Jersey to provide a java REST service to the outside world. I offer some functions that take JSON and I use the Jackson framework in combination with jersey to convert them into POJOs. I have the problem that if wrong jackson format is sent to the server, the answer (content of the http response) is a jackson specific exception description. If I have a POJO with an attribute "surname" and send "sursname" in the json string to the server, I get: Unrecognized field "sursname" (Class XY), not marked as ignorable at [Source: sun.net.httpserver.FixedLengthInputStream@903025; line: 1, column: 49] (through reference chain: XY["sursname"]) Thats quite ok, but I would like to have my own response content, for example my own error code. I already wrote a custom ExceptionMapper that should map all Throwables. @Provider public class WebserviceExceptionMapper implements ExceptionMapper<Throwable> { @Override public Response toResponse(Exception e) { e.printStackTrace(); return Response.status(400).entity("{\"errorcode\":\"CRITICAL_ERROR\"}").type(MediaType.APPLICATION_JSON).build(); } } It seems that the jackson exception is thrown before my webservice method is called, so i have no chance to map it? Does anyone have an idea? Big thanks und sorry for my english ;)

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