Thinking in Java, 2nd edition, Bruce Eckel

Thinking in Java is the only book I know that explains the WHY of Java; why it was designed the way it was, why it works the way it does, why it sometimes doesn’t work, why it’s better than C++, why it’s not. It covers the most important yet the least covered concepts of Java development: the whys.
It’s really cool to be able to understand the underlying principles and concepts from the start, rather than having to try to build that conceptual model through trial and error. It helps to solidify topics that was shaky on and will expand the knowledge base of its users.

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http://rapidshare.com/files/3989262/Thinking_in_Java.zip.html

Programming J2EE APIs with WebSphere Advanced

This IBM Redbook provides you with sufficient information to effectively use theIBM WebSphere and VisualAge for Java environments to create, manage anddeploy Web-based applications using the Java 2 Enterprise Edition APIspecification.

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http://rapidshare.com/files/4640190/Programming_J2EE_APIs_with_WebSphere_Advanced.zip.html

A Programmer's Guide to Java™ Certification

To pass the Sun Certified Programmer for Java 2 Platform 1.4 exam (SCPJ2 1.4) you need this book. It is written for any experienced programmer (with or without previous knowledge of Java) interested in mastering the Java programming language and passing the SCPJ2 1.4 exam.
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http://rapidshare.com/files/3831861/addison_wesley__-_a_programmer_s_guide_to_java_certification._second_edition.chm