I have the GCJ under Windows 7! Firstly, if anyone is interested, there is a very easy cygwin way to do it. The answer is all written down under alternate 1 at http://www.autexier.de/jmau/dev/gcj.html However, my questions: I have a few compiler errors I can't figure out. //--------------------------------------------------------------------------------------- ImagePixels.java:103: error: JuniorJPanel cannot be resolved to a type JuniorJPanel contentPanel = new JuniorJPanel(getColoredImage(Color.BLACK,300,300)); ^^^^^^^^^^^^ //--------------------------------------------------------------------------------------- This is a fabricated java class in one directory. Is classpath my problem? How do I specify a new CLASSPATH statement under /etc/profile ? If I have extra java lib jar files I want import statements to detect, do I put these in the classpath location?