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https://issues.apache.org/jira/browse/HADOOP-10927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Elser updated HADOOP-10927:
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Attachment: HADOOP-10927.diff
Fix the {{init()}} method to print the help message and return -1 instead of 0.
Also fixed malformed and incorrect Javadocs on {{init()}}. Loosened {{init()}}
visibility to protected over private so that I could test just that method.
> Ran `hadoop credential` expecting usage, got NPE instead
> --------------------------------------------------------
>
> Key: HADOOP-10927
> URL: https://issues.apache.org/jira/browse/HADOOP-10927
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Josh Elser
> Priority: Minor
> Attachments: HADOOP-10927.diff
>
>
> {noformat}
> $ hadoop credential
> java.lang.NullPointerException
> at
> org.apache.hadoop.security.alias.CredentialShell.run(CredentialShell.java:67)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at
> org.apache.hadoop.security.alias.CredentialShell.main(CredentialShell.java:420)
> {noformat}
> Ran a no-arg version of {{hadoop credential}} expecting to get the usage/help
> message (like other commands act), and got the above exception instead.
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