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There is no way how to find out, that FileSystem is invalid. Semantic of existing final method FileSystem.isValid has a little different meaning(snip from javadoc: "Generally invalidity would be caused by a name conflict in the filesystem pool."). This method can`t be final. snip from jglick contribution to openide-dev: Suggestion: 1. Make isValid non-final. 2. Make the default impl always return true. 3. Override sensible in LocalFileSystem, JarFileSystem, etc.
Set target milestone to TBD
Reassigning to new module owner jskrivanek.
In the new era of masterfs (which is always valid), I see no need for this enhancement.