An extensible Java library for HTTP request and response logging
...It satisfies a special need by a) allowing web application developers to log any HTTP traffic that an application receives or sends b) in a way that makes it easy to persist and analyze it later. This can be useful for traditional log analysis, meeting audit requirements or investigating individual historic traffic issues. Logbook is ready to use out of the box for most common setups. Even for uncommon applications and technologies, it should be simple to implement the necessary interfaces to connect a library/framework/etc. to it.
The XMLTester is an open-source platform for system-level testing of message based XML applications, including "Web Services" applications. XMLTester is implemented primarily in Java.
Please see www.xmltester.org for details.