Why do I get "java.lang.NoClassDefFoundError: sun/tools/javac/Main" ?

java.lang.NoClassDefFoundError: sun/tools/javac/Main means that your classpath is not set correctly. Make sure your JAVA_HOME is set up right before you run the tomcat or startup scripts. If that doesn't do it, see these FAQs:

• How do I set my CLASSPATH for servlets?
• When starting Tomcat l get "java.lang.NoClass...
• java.lang.NoClassDefFoundError in unix