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https://issues.apache.org/jira/browse/HADOOP-19118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17828517#comment-17828517
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Steve Loughran commented on HADOOP-19118:
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if e.e.getLocalizedMessage() is null it should fall back to e.toString()
> KeyShell fails with NPE when KMS throws Exception with null as message
> ----------------------------------------------------------------------
>
> Key: HADOOP-19118
> URL: https://issues.apache.org/jira/browse/HADOOP-19118
> Project: Hadoop Common
> Issue Type: Bug
> Components: common, crypto
> Affects Versions: 3.3.6
> Reporter: Dénes Bodó
> Priority: Major
>
> There is an issue in specific Ranger versions (where RANGER-3989 is not
> fixed) which throws Exception in case of concurrent access to a HashMap with
> Message {*}null{*}.
> {noformat}
> java.util.ConcurrentModificationException: null
> at java.util.HashMap$HashIterator.nextNode(HashMap.java:1469)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1503)
> at java.util.HashMap$EntryIterator.next(HashMap.java:1501) {noformat}
> This manifests in Hadoop's KeyShell as an Exception with message {*}null{*}.
> So when
> {code:java}
> private String prettifyException(Exception e) {
> return e.getClass().getSimpleName() + ": " +
> e.getLocalizedMessage().split("\n")[0];
> } {code}
> tries to print out the Exception the user experiences NPE
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.crypto.key.KeyShell.prettifyException(KeyShell.java:541)
> at
> org.apache.hadoop.crypto.key.KeyShell.printException(KeyShell.java:536)
> at org.apache.hadoop.tools.CommandShell.run(CommandShell.java:79)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:81)
> at org.apache.hadoop.crypto.key.KeyShell.main(KeyShell.java:553)
> {noformat}
> This is an unwanted behaviour because the user does not have any feedback
> what and where went wrong.
>
> My suggestion is to add *null checking* into the affected *prettifyException*
> method.
> I'll create the Github PR soon.
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