FATAL: the number of constructors during runtime do not match

[samrocketman]

...and compile time for java.lang.Exception do not match.

See http://blog.proxerd.pl/article/how-to-fix-incompatibleclasschangeerror-for-your-groovy-projects-running-on-jdk7

The simplest solution is to rewrite the exception classes as Java.

[samrocketman]

Groovy has a strange bug. When you compile a library with JDK6 byte code and try to run it on a JDK7 or higher JVM; the resulting error is mismatched arguments for exceptions.

The problem is fully described in:
http://blog.proxerd.pl/article/how-to-fix-incompatibleclasschangeerror-for-your-groovy-projects-running-on-jdk7

The solution to avoid future incompatibilities is to rewrite the Groovy exceptions as Java exceptions.