Tomcat 7 java.lang.NoSuchMethodError: main - Mac OS X 10.6

I have unpacked the tar file in /usr/local and created a symbolic link in /Library/Tomcat. From there I made all .sh files in /bin executable. Upon startup, I get nothing, including a normal "could not connect" upon visiting localhost:8080. Checking my catalina.out shows "Exception in thread "main" java.lang.NoSuchMethod开发者_如何学PythonError: main" for each instance that I tried to start it up. I have followed numerous tutorials, including those here and here, but nothing seems to help the problem.

EDIT: Here is the trace when starting Tomcat

Using CATALINA_BASE: /Library/Tomcat

Using CATALINA_HOME: /Library/Tomcat

Using CATALINA_TMPDIR: /Library/Tomcat/temp

Using JRE_HOME: /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home

Using CLASSPATH: /Library/Tomcat/bin/bootstrap.jar:/Library/Tomcat/bin/tomcat-juli.jar

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It seems you have incomaptible jar files in your classpath you use to launch Tomcat, (For example Tomcat 7 may depend on a library foo.jar version 1.2 but you have 1.1 installed)

The only way to know for sure is to see the strack trace (what method is Tomcat expecting and in which class). That will lead you to your problem.