java.lang.NoSuchMethodError, with both classes in the same JAR!

Question

My Java skills are a little rusty, but this is really weird: I am getting a java.lang.NoSuchMethodError at runtime when calling a method in a different class - note that the code compiled fine - and the other class is contained in the same JAR as the calling method!

That would seem to indicate it's not a classpath issue - but then what?

Answer 1

Check out this article. http://snippets.dzone.com/posts/show/3719

URL myClassURL = MyMysteryClass.class.getProtectionDomain().getCodeSource().getLocation();

That will tell you exactly where your class is being loaded from (according to the article). Should clear up any classpath questions.