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https://issues.apache.org/jira/browse/DERBY-6396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13807752#comment-13807752
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Knut Anders Hatlen commented on DERBY-6396:
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Do you happen know what kind of condition that made it return null? The javadoc
says that File.list() returns null if it is not a directory or if an I/O error
occurs. Since deleteAll() checks that the file exists and is a directory before
it calls list(), it sounds like there must have been some kind of I/O error.
> NullPointerException in DirFile
> -------------------------------
>
> Key: DERBY-6396
> URL: https://issues.apache.org/jira/browse/DERBY-6396
> Project: Derby
> Issue Type: Bug
> Components: Miscellaneous
> Affects Versions: 10.10.1.1
> Environment: Windows 7
> Reporter: Fabian Depry
>
> We got a NullPointerException trying to start a Derby database in embedded
> mode; the stacktrace indicated it happened in
> org.apache.derby.impl.io.DirFile.deleteAll(); that method got called from
> org.apache.derby.impl.io.BaseStorageFactory.createTempDir().
> After investigating, it appears that the deleteAll() method calls
> "super.list()", which according to the java.io.File specifications, can
> return null. But the deleteAll() method doesn't handle that case gracefully.
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