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What is in the jar file? Is the .class file on the correct path? The class file won't be found if it is on the wrong path.

Have you tried writing a small, simple program that uses one or more of...

Look in your jar file to see what it contains. You can use any zip utility program to open it. Rename to .zip if needed.
See if the StringUtils.class file is on the path: ...

Sorry, I do not understand what the problem is when the code is executed.
Can you copy the full text of the error messages from when the code is executed?


Looks like a constructor for the class