Sun's Tutorial
http://java.sun.com/docs/books/tutorial/reallybigindex.html

 The Language Spezification
http://java.sun.com/docs/books/jls/

 Code Conventions
http://java.sun.com/docs/codeconv/

 Classes of Java SE
http://download.java.net/jdk7/docs/api/allclasses-frame.html

 Packets of Java SE
http://download.java.net/jdk7/docs/api/overview-summary.html

 Java SE Documentation
http://download.java.net/jdk7/docs/

 HotSpot
http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html
http://java.sun.com/jsp_utils/PrintPage.jsp?url=http%3A%2F%2Fjava.sun.com%2Fdocs
%2Fhotspot%2FPerformanceFAQ.html
http://java.sun.com/products/hotspot/docs/whitepaper/Java_HotSpot_WP_Final_4_30_
01.html

 Java Glossary by Roedy Green
http://mindprod.com/jgloss/jgloss.html

 Java tools (java, javac, javadoc, ...)
http://download.java.net/jdk7/docs/technotes/tools/index.html

 "javadoc" for Microsoft® Windows
http://download.java.net/jdk7/docs/technotes/guides/javadoc/index.html

 Java bugs
http://bugs.sun.com/bugdatabase/

 API difference
http://java.sun.com/javase/6/jcp/beta/apidiffs/index-diffs.html

 Serializiation specification
http://java.sun.com/javase/6/docs/platform/serialization/spec/serialTOC.html

 Java Look and Feel Design Guidelines  
http://java.sun.com/products/jlf/ed2/book/HIGTOC.html

 Swing Keys
http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/doc-files/Key-Index.html

 Teach Yourself Programming in Ten Years
http://norvig.com/21-days.html

 SSCCE
http://homepage1.nifty.com/algafield/sscce.html

see http://mindprod.com/jgloss/gettingstarted.html
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com