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https://issues.apache.org/jira/browse/HADOOP-13320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348798#comment-15348798
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niccolo becchi commented on HADOOP-13320:
-----------------------------------------
Thanks [~templedf], you are right, I have included it in the ticket's
description.
> Fix arguments check in documentation for WordCount v2.0
> -------------------------------------------------------
>
> Key: HADOOP-13320
> URL: https://issues.apache.org/jira/browse/HADOOP-13320
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation
> Reporter: niccolo becchi
> Priority: Trivial
>
> This issue is affecting the documentation page, so the code is not covered by
> any tests. It's actually visible on the page:
> https://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html#Example:_WordCount_v2.0
> On the Example: WordCount v2.0
> The actual arguments check is wrong, as it's never printing the message of
> the correct usage. So, running the code with no parameters, as in the
> following example:
> {code}
> yarn jar /var/tmp/WordCount.jar task0.WordCount2
> {code}
>
> I have got the following exception message in output:
> {code}
> Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0,
> Size: 0
> at java.util.ArrayList.rangeCheck(ArrayList.java:635)
> at java.util.ArrayList.get(ArrayList.java:411)
> at task0.WordCount2.main(WordCount2.java:131)
> 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.util.RunJar.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> {code}
> Intead than the expected friendly message:
> {code}
> Usage: wordcount <in> <out> [-skip skipPatternFile]
> {code}
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