The UU's Kawa Licensed Toolkit is here - Download Kawa 3.22

Have a look at this introduction to Java Tutorial from the Sun Site for Windows, Unix and Mac users.

Books

Enterprise JavaBeans
Richard Monson-Haefel
1st Edition June 1999
1-56592-605-6,
O'Reilly

Java Servlet Programming
Jason Hunter with William Crawford
1st Edition November 1998
1-56592-391-X,
O'Reilly

JavaTM Application Frameworks
Darren Govoni
John Wiley
ISBN 0471329304
June, 1999

Java Distributed Objects
Bill McCarty
SAMS Press 1999
ISBN: 0-672-315378

Java in plain English
Brian Overland
MIS Press
ISBN: 1-55828-503-2

Using Java 1.2
Mike Morgan
Que
ISBN: 0-7897-16275

Mastering Java 1.2
John Zukowski
Sybex
ISBN: 07821-2180-2

How to program in Java
Deitel & Deitel
Prentice-Hall
ISBN: 0-13890765-X

Relevant links for java topics/resources are:

Sun's Java Beans
Java Tools
Jacob - A java ORB
Java Development Toolkit 1.2
Mediabeans
IBM's Alphaworks - great source for Java stuff
Java Shareware
Java Virtual Machine
Playground
Radus
Mercury
Intel's Java Group
SW Technologies
Java Resources
Javatoys
JAPP
Java Multimedia
Kiwisoft
JNet
IBM's Java stuff

Colloboration Java Frameworks