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https://issues.apache.org/jira/browse/GROOVY-5727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407349#comment-15407349
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Paul King commented on GROOVY-5727:
-----------------------------------

I upgraded to 3.0.1 for the master branch (upcoming 2.5 release).

The 3.1 api contains a breaking change. We'd have to be careful to make sure we 
don't impact legacy users. There is possibly no problem but I haven't 
investigated yet so went with the more conservative 3.0.1.

> Ovverriding 3rd Party libraries shipped
> ---------------------------------------
>
>                 Key: GROOVY-5727
>                 URL: https://issues.apache.org/jira/browse/GROOVY-5727
>             Project: Groovy
>          Issue Type: Improvement
>          Components: Groovysh
>    Affects Versions: 2.0.4
>            Reporter: deas
>              Labels: contrib
>
> Groovy 2.0.4 ships various 3rd party libraries, e.g. servlet-api-2.4.jar and 
> jsp-api-2.0.jar. These can get in the way and I see no reasonable way to use 
> user defined versions in groovysh. Of course you can introduce a custom 
> classloader searching locally before delegating to the parent or just remove 
> the library shipped to get it out of the way, but I feel there should be a 
> groovier way. Maybe you should just omit shipping these libraries.
> A concrete situation where I encountered this problem was when I wanted a 
> groovy script to launch jetty with servlet 3.0 support, pulling in various 
> dependencies with Grape.



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