java.lang.IncompatibleClassChangeError when MoreThanOneElementException is thrown

[dnahodil]

Steps to reproduce
Call only() on a list with more than one element. e.g.:

[1, 2].only()

What should happen
A MoreThenOneElementException is thrown.

What does happen
The following error is thrown:

java.lang.IncompatibleClassChangeError: the number of constructors during runtime and compile time for java.lang.RuntimeException do not match. Expected -1 but got 5
    at com.dnahodil.groovy.extensions.MoreThanOneElementException.<init>(MoreThanOneElementException.groovy:6)
    at com.dnahodil.groovy.extensions.ListExtensions.only(ListExtensions.groovy:13)

[dnahodil]

Looks like this is only a problem on some versions of Java.

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

[dnahodil]

On second look it seems to work fine on Groovy 2.2.1 but is broken on 2.0.5.