Latest Java release is 1.4.2_01.
Works fine with Mozilla/Firebird/Konqueror..., (unlike your version), and makes the blackdown java releases obsolete.
Give it a try. The official Sun installer "misses" putting the java directory to path (the default is /usr/java, while normally just /usr/bin is in the system path), but you can put the dir in the path manually, else you will encounter something like putting in the console " java -?" and getting the answer that java not found as an executable...