Do I need a symlink to make javaws, that is, Java Web Start, work if I have a personalized location for my Java?

I have installed Java as follows:

sudo update-alternatives --install "/usr/bin/java" "java" 

    "/home/user/programs/jdk6u32/bin/java" 1



sudo update-alternatives --install "/usr/bin/javaws" "javaws" 

    "/home/user/programs/jdk6u32/bin/javaws" 1



sudo update-alternatives --config java

sudo update-alternatives --config javaws



sudo ln -s /home/user/programs/jdk6u32/jre/lib/amd64/libnpjp2.so 

    /usr/lib/firefox-addons/plugins/libnpjp2.so

The last line is necessary for Firefox to find the Java plug-in. It sets up a symlink. It was due to advice found on stackexchange and I suspect I need something similar for javaws and if so, what would it be?

I am on ubuntu 12.04 (Precise) and Firefox 12.0 and Oracle Java 6 update 32.