Hey there, I found a reply from Thomas about this topic 
here 
https://groups.google.com/d/msg/codehaus-mojo-gwt-maven-plugin-users/3L-B-1L6w84/t228UPuy_LIJ
I think they are threadsafe and so does Thomas. They need to verify it and 
patch it. 

Em quarta-feira, 6 de fevereiro de 2013 10h59min59s UTC-2, Oliver Krylow 
escreveu:
>
> Encountered the following warning upon running the maven command `mvn -T 
> 16 <goal>` on one of my better build machines :).
>
>
> [WARNING] *****************************************************************
> [WARNING] * Your build is requesting parallel execution, but project      *
> [WARNING] * contains the following plugin(s) that are not marked as       *
> [WARNING] * @threadSafe to support parallel building.                     *
> [WARNING] * While this /may/ work fine, please look for plugin updates    *
> [WARNING] * and/or request plugins be made thread-safe.                   *
> [WARNING] * If reporting an issue, report it against the plugin in        *
> [WARNING] * question, not against maven-core                              *
> [WARNING] *****************************************************************
> [WARNING] The following plugins are not marked @threadSafe in gwt-cryptojs:
> [WARNING] org.codehaus.mojo:gwt-maven-plugin:2.5.0
> [WARNING] *****************************************************************
>
>
> I am pretty sure the gwt compiler itself supports parallel compilation of 
> permutations, so is there something in the plugin that is not threadsafe? 
>
>

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