It would be great if a debugging version of rt.jar were available, which was built with -g:all symbols and line-number tables for debugging. This would
facilitate better debugging than printlns.

In addition, the AWT and Swing teams are investigating adding assertions to a debug version of our class files to check for error conditions which today go unchecked, and would break existing apps if we checked them now. Having a rt_g.jar file we can add these debug-versioned classes would eliminate forcing developers to use -Xbootclasspath or hack their rt.jar files.