[jira] [Created] (KNOX-501) Avoid NPE , in case of passing invalid argument to KnoxCli.

["J.Andreina (JIRA)" <ji...@apache.org>]

J.Andreina created KNOX-501:
-------------------------------

             Summary: Avoid NPE , in case of passing invalid argument to KnoxCli.
                 Key: KNOX-501
                 URL: https://issues.apache.org/jira/browse/KNOX-501
             Project: Apache Knox
          Issue Type: Bug
            Reporter: J.Andreina


Proper Error message should be displayed , incase of passing invalid argument to KnoxCli , instead of throwing NPE.

{noformat}
# ./knoxcli.sh --cluster clusterName1
java.lang.NullPointerException
        at org.apache.hadoop.gateway.util.KnoxCLI.run(KnoxCLI.java:92)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.gateway.util.KnoxCLI.main(KnoxCLI.java:669)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.hadoop.gateway.launcher.Invoker.invokeMainMethod(Invoker.java:70)
        at org.apache.hadoop.gateway.launcher.Invoker.invoke(Invoker.java:39)
        at org.apache.hadoop.gateway.launcher.Command.run(Command.java:101)
        at org.apache.hadoop.gateway.launcher.Launcher.run(Launcher.java:69)
        at org.apache.hadoop.gateway.launcher.Launcher.main(Launcher.java:46)
{noformat}



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