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Before I joined Sun, I thought I knew a lot about Java. I had been using it for a decade and had dug into its innards more times than I could count. Anytime I ran into inexplicable Swing weirdness or whatnot I wouldn't hesitate to dive into the JRE's source code and study it, or even recompile the classes with my own diagnostic code added. I wrote my own classloaders, I manipulated bytecode on the fly, I even wrote my own compiler for a JVM-targeted language. I had earned the right to call myself a guru. Or so I thought.