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findAllResources includes those found in the parent, and CL.gAR merges in the parent resources (you cannot override this). Therefore e.g. the class loader used for core + openide includes dupes of bootstrap resources. Aggravates issue #31676, probably.
Issue #32303 is what I meant.
Fixed in a branch: #d322e574dffb
Merged in core-main #78103b644dfc.
Integrated into 'main-golden', will be available in build *200811041401* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/d322e574dffb User: Jesse Glick <jglick@netbeans.org> Log: #32576: fixing {get,find}Resource{,s} delegation semantics to match e.g. URLClassLoader. Needed for #149136 so that NbInstaller can find META-INF/generated-layer.xml without delegation to parents.