Calc0.jj in GWT - a quick demo app that lets you input simple calculations, and displays 1 if valid, or an exception if an error occurred while parsing
Calc2.jj in GWT - now the app displays the evaluated value of the equation, or an error message if something goes wrong
Simple Java parser in GWT - this app toggles between a textarea to edit text and the highlighted syntax version of the same code. Another module exists which can be used from plain JS to emit syntax-highlighted Java as an html string