I suggest that you try to take a look at the command arguments that are being used when Eclipse (?) launches the JVM to run Tomcat. On Linux, I'd use ps -efl | grep java
to find this out ...
For reference: this Eclipse forum post gives 2 ways to set the bootclasspath in an Eclipse Launcher:
- You can add a -Xbootclasspath option to the JVM args.
- You can change the bootclasspath in the classpath tab.