There are unnecessarily eclipse internal Groovy Library classpath container referenced in the .classpath file. This may lead to conflicts with the OFBiz "original" groovy libs contained in the framework and produces errors while running OFBiz within eclipse.
<classpathentry exported="true" kind="con" path="GROOVY_SUPPORT"/>
<classpathentry exported="true" kind="con" path="GROOVY_DSL_SUPPORT"/>
I'll provide a patch for this.