Java : File.exists() inconsistencies when setting “user.dir”

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Setting user.dir is unsupported. It should be considered a read-only property.

For example the evaluation of Bug 4117557 in the Sun Bug Parade contains this text:

“user.dir”, which is initialized during jvm startup, should be used as an
informative/readonly system property, try to customize it via command line
-Duser.dir=xyz will end up at implementation dependend/unspecified behavior.

While this text is about setting it on the command line, setting it via setProperty() is most likely equally undefined.

When you can reproduce the problem without setting user.dir manually, then you’ve found a genuine problem.

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