This issue is reproducible since ESB Editor 1.3. (I have updated my tools yesterday and I wonder. When I run bot tests I get ESB editor version 1.3, but when I create esb project in my workspace I get version 1.2)

Steps to reproduce:

1. create esb project
2. create esb service
3. add Groovy action to service
4. navigate to groovy action in esb editor tree
5. click 'Browse' button (to select groovy script)
6. in browse dialog, select any subfolder of any .jar (This dialog should not allow you to select folder, when you are browsing for *.groovy file) and press 'Finish'
7. NPE appears in log, in editor, text field seem like change was done, but in xml file nothing changes