An interative demo and ZIP download are hosted on GAE here http://redquerybuilder.appspot.com/
RedQueryBuilder uses an adapted parser from http://www.h2database.com/html/main.html and shares the parse object tree.
Known to be good: Eclipse 4.4.2, Google plugin 3.8.0, GWT 2.7.0
JSInterop tests need: -Dgwt.args="-XjsInteropMode JS -nodevMode"