Eclipse changed JRE for a project

Question

I changed the JRE for a project in eclipse (Sun to JRockit). But when I try to run a class with main method I get a pop-up error message "Could not find main class. Program will exit" and "Exception in thread "Main Thread" java.lang.NoClassDefFoundError: Jrockit1/5" in the console. I can see that the project got rebuilt (timestamp of class files). What else do I need to change? All of this is for JRE 1.5

Answer 1

When you look at the Run configuration, does it use Sun or JRockit JVM. If you created your project before, it could have been set to the Sun JVM; which maybe cannot find some JRockit-specific classes.