Java - a hotchpotch of resources

(This is now massively out of date, I'm afraid...)

Servlet Design - How can I do <xxx> in a servlet?
Compiling And Working With Packages - A set of rules to keep your compiler and interpreter happy.
The Extensions Mechanism - How to use it, and a couple of caveats.
Strings/StringBuffers - When String concatenation makes sense, and when it's plain evil.
String conversions - The Good, the Okay-I-Suppose, and the Utterly Horrible.
Classpath woes - Dr Classpath, or "How I Learned to Stop Worrying and Love the Defaults"
Newsgroup guidelines - How to get the most out of the comp.lang.java.* newsgroups.
Parameter passing in Java - an explanation of the pass-by-reference/pass-by-value confusion.
Converting a Java application into an exe file - an overview of why you might want to do it, and why you possibly shouldn't even if you think you want to.
Learning Java in stages - a suggested approach to tackling Java, and why diving in at the deep end probably isn't a good idea.

Roedy Green's Java Glossary: The first place to look for the answer to a problem.
Sun's Coding Conventions: Even if you don't follow them, you should have reasons for it. I don't like the bracing style myself, but the rest is good stuff.
Bruce Eckel's site: Includes a downloadable version of Thinking in Java, 2nd edition
The Java Language Specification (2nd edition): The definitive language specification. Useful for language-lawyer questions.
The Java Virtual Machine specification: Useful for details such as class-file formats.
Debug Strategy: Patricia Shanahan's guide to debugging

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