Grails not executing on IntelliJ (NoClassDefFoundError)

I have upgraded my application from grails 1.2.2 to 1.3.1-RC1. While things seem to work when executing grails from command prompt, I cannot make it run from my IDE IntelliJ (last development 开发者_运维百科version).

The error I got straightaway is:

Error executing script RunApp: net/sf/json/JSONException 
... 
Caused by: java.lang.ClassNotFoundException: net.sf.json.JSONException 

Adding the library json-lib.jar to the modules dependencies does not change anything in IntelliJ.

Also, it seems that there are 2 JSONException classes defined in 2 different packages :

• org.codehaus.groovy.grails.web.json in grails.jar
• another package net.sf.json in json-lib-2.3-jdk15.jar located in lib folder of cloud-foundry plugin

Do you have any idea about what's happening?

In case, someone encountered the same problem, I finally managed to solve the issue without being sure what was the real fix.

In any case, my problem happened after I have upgraded my Grails from 1.2 to 1.3 and I had old libraries attached to plugins. What I did is:

Project Settings -> Modules -> irofoot-grailsPlugins -> Dependencies -> Grails User Library -> Edit -> Detach old libraries (with Grails-1.2 path)

and then it worked (no more ClassNotFoundException)!!