When attempting to execute a pipeline that loads a library written in Groovy I receive the following exception:

Unsupported expression for CPS transformation @ line -1, column -1

The Groovy class that is referenced is a simple POGO with the class-level annotation

 @EqualsAndHashCode 

. Removing the annotation resolves the exception for that class.

This is a major problem with the plugin and it almost makes it unusable. For any non-trivial library it will most likely make use of Groovy language features such as class annotations. To remove the annotations would require extensive refactoring throughout the library and introduce a lot of boiler plate.

Lack of support for Groovy class annotations is not explicitly documented (as far as I can see) either in this plugin or in the [workflow-cps-plugin](https://github.com/jenkinsci/workflow-cps-plugin).

A workaround or solution would be very much appreciated!