A DESCRIPTION OF THE REQUEST :
See http://bugs.java.com/view_bug.do?bug_id=8054565

This bug is not fixed in 8u, and no plans were made to fix it there.  See http://marc.info/?t=141767408700004&r=1&w=2 thread for fix discussion.



JUSTIFICATION :
Backporting this bug to Java 8 would alleviate problems with multiple close() calls that are used in at least one popular library - Apache PdfBox used in conjunction with Oracle JDBC driver.  This is probably an edge case, but has been reported elsewhere as well.

See - http://pdfbox-users.markmail.org/message/ld5x7mrb64pilgqb.  Asking this team to workaround the bug seems non-ideal.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect the patched Java 9 behavior, and the fulfilled contract of Closable.  
ACTUAL -
Calling close on an already closed resource should do nothing per the Closable contract.

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See http://bugs.java.com/view_bug.do?bug_id=8054565
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CUSTOMER SUBMITTED WORKAROUND :
Override close().  Not always reasonable if you don't own the library.