This report will be a whole lot of pain to deal with .
Firstly, I presume it only happens on Windows. Such file-locking problems don't happen on non-windows systems.
Secondly, I expect it would mean looking through every patch applied on the 1_1_1 branch since 1.1.0 to see if any are likely candidates for causing this.
This issue does seem similar to one reported here recently:
Note however that this is not a digester bug as such; the patch was just accepted into digester as a workaround.
And note also that while myfaces uses digester this isn't likely to be the cause of the reported problem, as
digester has used the code "new InputSource(String)" [which apparently triggers the problem] for many releases.