A servlet filter that adds request identifiers to slf4j's mapped diagnos...

...tic context (MDC) , it allows logging output at multiple levels of your service to be easily grouped by the originating request.

This is an adaptation of something we've been running in 0.6.2. By using the MDC and an appropriate logFormat, this allows a developer to see which server-side logs were generated within the same request.

At the same time, any exceptions received by a client can be easily associated back to server-side error logs.