Apple has added two new files that weight 48MB in its support section [1]. The first is the Java SE 5.0 Release 1 [2] while the second is the Developer Documentation [3] for this API.

The description provided for Java SE 5.0 Release 1 is:

Java 2 Platform Standard Edition (J2SE) 5.0 Release 1 provides support for J2SE 5.0 on Mac OS X 10.4.
This release does not replace the existing installation of J2SE 1.4.2.

For detailed information on this Update, please visit this website: http://www.info.apple.com/kbnum/n301073 [4]