In /usr/bin/limewire, the java executable is hardcoded to /usr/bin/java. But Sun's JRE is in /opt/java/bin/java, so that doesn't work.

Sun's JRE creates a shell variable $JAVA_HOME, denoting the location of the java executable. I don't know if the other jre packages also set this variable; if they do, replacing /usr/bin/java with $JAVA_HOME/bin/java would do the trick.

If only some JREs set this variable, you could check to see if the variable is set, and use it if it is, falling back on the original hardcoded version. If nothing else, it'd let limewire work with Sun's JRE.

if [ "$JAVA_HOME" == "" ]; then
jv=/usr/bin/java
else
jv=$JAVA_HOME
fi

$jv/bin/java ...