Built by Amber Feng, Allen Chen, and Stephen Tu for the 2010 Yahoo Hack Day at UC Berkeley
WebIDE is a collaborative (real-time) browser IDE complete with syntax highlighting, compile/warning line highlighting, method list via reflection and byte-code analysis, and in-browser console (with standard input).
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Download sbt: http://code.google.com/p/simple-build-tool
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Download source code:
git clone [email protected]:afeng/webide.git - 
Run sbt to build:
cd webide sbt update ~jetty-run - 
Now go to http://localhost:8080
 
Note that this requires JDK 1.6 (not just JRE, since we use javax.tools.*)