It's a nasty habit of Oracle that they install a
Java 1.3 JRE besides the Oracle software. So most likely your Java configuration is messed up by the installation of the Oracle software.
Edit the PATH environment variable and remove the path to the JRE that's included with Oracle.
You do not need to have C:\j2sdk1.4.2_10\jre\lib\rt.jar in the CLASSPATH.
Setting the environment variable JAVAHOME doesn't do anything. Some programs use JAVA_HOME (note: with underscore) but the JDK and JRE itself don't use that environment variable.
[ October 16, 2006: Message edited by: Jesper Young ]