I have had the same problem[weblgic server jdk 1.4.1.05], i resolved it by downloading higher jdk version1.4.1? That's eight years old and never worked properly in the first place. I would try something a lot more current. Even 1.5 is six years old. Try 1.6.
in jdk 1.4 [jdk 184.108.40.206]