Released yesterday: Java for Mac OS X 10.4, Release 6.
Make sure you don't get a version number wrong...
From the page:
Java for Mac OS X 10.4, Release 6 delivers improved reliability and compatibility for Java SE 5.0 and Java 1.4 on Mac OS X 10.4.10 and later. This release updates J2SE 5.0 to version 1.5.0_13 and Java 1.4 to version 1.4.2_16.
The release notes are here.