Eclipse does not lock files, none of them, including xls ...
May be you have an excel process still in execution (not killed by buggy OLEEditor) that
keeps some locks ?
"OOTB Eclipse" ? don't know what it is, but may be the problem is here ?
I do use Excel spreadsheet in real applications. But in real applications, real users are
not under eclipse...
And me, under Eclipse, never experienced such boring procedures, as soon as I banned
OLEEditor ... and put my XLS outside source code to avoid refreshing (put them in a
resource dir, something external to intern code, because rules are evolving).
And once again, XLS eclipse editor is part of eclipse, not drools plugin. In fact, I am
pretty sure that this OLE Editor is more there as a demo to embed OLE components (still
not understand the utility to transform something portable to win-specific ...), rather
than a real supported feature ... but it is my opinion.