please help : GroovyCastException: why ?

[Mickaël SALMON]

Hello,

I'm using last Groovy version (3.0.1) in my Java application to run user 
defined scripts (Java based).
Here is how a script is executed (sorry for the formatting) :

   public Object eval(String scriptName, String script, Map<String, Object> 
mapVariable)
                   throws CochiseException {
       groovy.lang.Script groovyScript = this.scriptCache.get(scriptName);
       if (groovyScript == null) {
           groovyScript = new GroovyShell().parse(script);
           this.scriptCache.put(scriptName, groovyScript);
       }
       groovyScript.setBinding(new Binding(mapVariable));
       return groovyScript.run();
   }

I have the following exception when I pass the object "Article" of class 
"com.sylob.cochise.dm1.ejb.entite.article.Article" in the Map of variables :
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast 
object 'interface com.sylob.cochise.dm1.ejb.entite.article.Article' with class 
'java.lang.Class' to class 'com.sylob.cochise.dm1.ejb.entite.article.Article'

Here is the script :

import com.sylob.cochise.dm1.ejb.entite.article.Article;

println "CL import Article : " +  Article.class.getClassLoader()
println "CL var Article: " + Article.getClass().getClassLoader()

Article articleTmp = (Article) Article;
// ... some stuff

This not seem to be a classLoader problem, because same class loader is used to 
load both com.sylob.cochise.dm1.ejb.entite.article.Article class in the script 
and "Article" object in the calling application.
Also tested with 2.5.9, same error.

What's wrong here ?

Thanks.