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https://issues.apache.org/jira/browse/YARN-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238322#comment-15238322
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Robert Kanter commented on YARN-4366:
-------------------------------------
We should verify that this doesn't break anything. As explained in [this
StackOverflow|http://stackoverflow.com/questions/5401537/i-have-got-this-warning-non-varargs-call-of-varargs-method-with-inexact-argumen],
there's a difference between something like {{cls.getMethod(action, null);}}
and something like {{cls.getMethod(action);}}. The latter constructs an empty
array while the former is ambiguous if it passes a single {{null}} instance or
an array with a single {{null}} element (hence the warning).
Unfortunately, besides being reflection, the code is very generic, so it's not
straightforward to track down what it's being called on and what those expect
here.
> Fix Lint Warnings in YARN Common
> --------------------------------
>
> Key: YARN-4366
> URL: https://issues.apache.org/jira/browse/YARN-4366
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 2.7.1
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Attachments: YARN-4366.001.patch
>
>
> {noformat}
> [WARNING]
> /Users/daniel/NetBeansProjects/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/Router.java:[100,45]
> non-varargs call of varargs method with inexact argument type for last
> parameter;
> cast to java.lang.Class<?> for a varargs call
> cast to java.lang.Class<?>[] for a non-varargs call and to suppress this
> warning
> [WARNING]
> /Users/daniel/NetBeansProjects/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/factory/providers/RpcFactoryProvider.java:[62,46]
> non-varargs call of varargs method with inexact argument type for last
> parameter;
> cast to java.lang.Class<?> for a varargs call
> cast to java.lang.Class<?>[] for a non-varargs call and to suppress this
> warning
> [WARNING]
> /Users/daniel/NetBeansProjects/hadoop/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/factory/providers/RpcFactoryProvider.java:[64,34]
> non-varargs call of varargs method with inexact argument type for last
> parameter;
> cast to java.lang.Object for a varargs call
> cast to java.lang.Object[] for a non-varargs call and to suppress this
> warning
> {noformat}
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