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https://issues.apache.org/jira/browse/HADOOP-10927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083225#comment-14083225
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Wei Yan commented on HADOOP-10927:
----------------------------------
This exception happened due to the following code in CredentialShell.java. The
init() function returns 0 instead of -1 if the args is empty, which causes the
run() failed.
{code}
private int init(String[] args) throws IOException {
for (int i = 0; i < args.length; i++) { // parse command line
.........
}
return 0;
}
{code}
> 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
>
> {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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