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https://issues.apache.org/jira/browse/HADOOP-11377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239240#comment-14239240
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Steve Loughran commented on HADOOP-11377:
-----------------------------------------

this may not be a real issue...those null.java files appear to be there as one 
java file is needed for the build; it may be something that can be ignored

> jdiff failing on java 8, "Null.java" not found
> ----------------------------------------------
>
>                 Key: HADOOP-11377
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11377
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: build
>    Affects Versions: 2.7.0
>         Environment: Java8 jenkins
>            Reporter: Steve Loughran
>
> Jdiff is having problems on Java 8, as it cannot find a javadoc for the new 
> {{Null}} datatype
> {code}
> '<https://builds.apache.org/job/Hadoop-common-trunk-Java8/ws/hadoop-common-project/hadoop-common/dev-support/jdiff/Null.java'>
> The ' characters around the executable and arguments are
> not part of the command.
>   [javadoc] javadoc: error - Illegal package name: ""
>   [javadoc] javadoc: error - File not found: 
> "<https://builds.apache.org/job/Hadoop-common-trunk-Java8/ws/hadoop-common-project/hadoop-common/dev-support/jdiff/Null.java";>
> {code}



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