I am also having this problem. I installed the JRE 1.3.1 RPM before and after trying to run runlime.sh , but get the same error:

Couldn't find or load essential class `java/lang/Object' java.lang.NoClassDefFoundError java/lang/Object
runlime.sh: line 11: 2148 Aborted (core dumped) java -classpath . RunLime

What exactly is a classpath? Maybe if someone could help me to understand that, the problem will be easy to fix.