I just took a look and it does not look like there is much on this subject. 
It does appear to effect memory in a browser and I recently deleted the out 
of sync entries in eclipse within the gwt-cache folders as specified in the 
eclipse error.log
On Tuesday, May 29, 2012 3:32:54 AM UTC-4, Thomas Broyer wrote:
>
>
> On Tuesday, May 29, 2012 8:53:07 AM UTC+2, tong123123 wrote:
>>
>> I try to run mvn:clean install and the content in gwt-unitCache (not the 
>> one in target directory, but the one directly under the project folder) 
>> will not changed, so what is its use? Could I not commit this folder in svn 
>> if it is not important?
>>
>
> AFAICT, gwt-maven-plugin will only create things under target/ (unless 
> told it otherwise). If you have a gwt-unitCache folder sibling to the 
> target/ folder, it has probably been creating when launching the DevMode 
> from within Eclipse (rather than "mvn gwt:run").
>
> Anyway, as its name suggests, it's a "cache", you shouldn't generally 
> commit it to your SCM.
> See 
> https://developers.google.com/web-toolkit/release-notes#Release_Notes_2_4_0
>  and http://code.google.com/p/google-web-toolkit/issues/detail?id=6802
>

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