Java Security Hotlist - - List with commentary and searchable index of Java security resources, from the authors of the book "Securing Java". By Gary McGraw and Edward Felten.
KeyTool GUI - - A utility that is a GUI version of the keytool provided with the Java SDK. [GPL.
O'Reilly - Java And Security - - Article that examines various Java security services, including Java Security Manager, Security Provider Architecture, and Authentication components.
Secure your Java apps from end to end - - Javaworld article by Todd Sundsted that examines the foundation of Java security, including virtual machine and byte code security. (June 15, 2001)