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https://issues.apache.org/jira/browse/MCHECKSTYLE-294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551158#comment-14551158
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Bob Fields commented on MCHECKSTYLE-294:
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Stack trace snippet, occurs in 2.15 and 2.16-SNAPSHOT:
Caused by: java.lang.NullPointerException
at
org.apache.maven.plugin.checkstyle.exec.DefaultCheckstyleExecutor.configureResourceLocator(DefaultCheckstyleExecutor.java:890)
at
org.apache.maven.plugin.checkstyle.exec.DefaultCheckstyleExecutor.executeCheckstyle(DefaultCheckstyleExecutor.java:102)
at
org.apache.maven.plugin.checkstyle.AbstractCheckstyleReport.executeReport(AbstractCheckstyleReport.java:473)
at
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:155)
> NPE on missing license artifact, not fixed previously
> -----------------------------------------------------
>
> Key: MCHECKSTYLE-294
> URL: https://issues.apache.org/jira/browse/MCHECKSTYLE-294
> Project: Maven Checkstyle Plugin
> Issue Type: Bug
> Components: checkstyle:checkstyle
> Affects Versions: 2.15, 2.16
> Environment: Windows7 x64 JDK8 Checkstyle 6.2 maven-checkstyle-plugin
> 2.15 and 2.16-SNAPSHOT as of 5/20/2015.
> Reporter: Bob Fields
> Labels: easyfix, patch
> Fix For: 2.16
>
> Attachments: MCHECKSTYLE-294.java.patch
>
>
> MCHECKSTYLE-250 fix does not check for null values, only for invalid URL.
> This patch checks for null values and fixes the original problem, and emits a
> warning if the license file is missing (but does not kill the checkstyle
> process or site build). Interestingly - this error only occurs on 'mvn site',
> not on 'mvn checkstyle:checkstyle'.
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