Adding the file descriptor to the text of the exception is a relatively minor enhancement which could greatly assist engineers trying to diagnose such problems.

Here's example stack from submitter :

Currently the application fails with no additional information provided:

java.lang.Error: Cleaner terminated abnormally
        at sun.misc.Cleaner$1.run(Cleaner.java:130)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.misc.Cleaner.clean(Cleaner.java:127)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:124)
Caused by: java.lang.Error: java.io.IOException: Bad file descriptor
        at sun.nio.ch.Util$SelectorWrapper$Closer.run(Util.java:217)
        at sun.misc.Cleaner.clean(Cleaner.java:125)
        ... 1 more
Caused by: java.io.IOException: Bad file descriptor
        at sun.nio.ch.EPollArrayWrapper.interrupt(Native Method)
        at sun.nio.ch.EPollArrayWrapper.interrupt(EPollArrayWrapper.java:256)
        at sun.nio.ch.EPollSelectorImpl.wakeup(EPollSelectorImpl.java:175)
        at sun.nio.ch.SelectorImpl.implCloseSelector(SelectorImpl.java:92)
        at java.nio.channels.spi.AbstractSelector.close(AbstractSelector.java:91)
        at sun.nio.ch.Util$SelectorWrapper$Closer.run(Util.java:215)
        ... 2 more