I had a similar problem with the Moz 1.2 I'm using on my
unstable/testing system. The solution that was suggested to me here my
a kind user was to get the 1.4 jdk compiled with gcc 3.2 and then I
just copied over the java plugin. You can find the a Java 1.4
distribution, compiled with gcc 3.2, at
ftp://metalab.unc.edu/pub/linux/devel/lang/java/blackdown/JDK-1.4.1/i386/01/
get the file j2re-1.4.1-01-linux-i586-gcc3.2.bin. Run it (it's a
self-extracting shell-script) and then go into
j2re1.4.1/plugin/i386/mozilla
and copy javaplugin_oji.so to your mozilla plugin directory.