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https://jira.codehaus.org/browse/MCHECKSTYLE-205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=337034#comment-337034
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David Ignjic commented on MCHECKSTYLE-205:
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I confirm this bug also happen for me to upgrading 2.11
> NPE in CheckstyleReportGenerator.doFilesSummary:654 version 2.11 regression
> ---------------------------------------------------------------------------
>
> Key: MCHECKSTYLE-205
> URL: https://jira.codehaus.org/browse/MCHECKSTYLE-205
> Project: Maven Checkstyle Plugin
> Issue Type: Bug
> Affects Versions: 2.11, 2.12
> Environment: maven-checkstyle-plugin v2.11 and 2.12-SNAPSHOT (as of
> 12/5/13). Windows 7, JDK7.45 64 bit, maven 3.1
> Reporter: Bob Fields
> Attachments: CheckstyleResults.java.patch
>
>
> This worked in release 2.10, no longer works in 2.11. Running mvn site
> against a large project with a parent pom with many subprojects (though no
> code in the parent project) (andromda v3.5-SNAPSHOT, from sourceforge). Maven
> output:
> [INFO] Generating "Checkstyle" report ---
> maven-checkstyle-plugin:2.12-SNAPSHOT
> [INFO] Starting audit...
> ... About 6000 files ...
> Audit done.
> [INFO] There are 4777 checkstyle errors.
> .... And no additional troubleshooting information, even in debug mode ...
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-site-plugin:3.3:site (default-site) on project
> andromda: Execution default-site of goal
> org.apache.maven.plugins:maven-site-plugin:3.3:site failed.
> NullPointerException -> [Help 1]
> Caused by: java.lang.NullPointerException
> at java.lang.String.compareTo(String.java:1139)
> at java.lang.String.compareTo(String.java:108)
> at
> java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:290)
> at java.util.ComparableTimSort.sort(ComparableTimSort.java:171)
> at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
> at java.util.Arrays.sort(Arrays.java:472)
> at java.util.Collections.sort(Collections.java:155)
> at
> org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doFilesSummary(CheckstyleReportGenerator.java:654)
> at
> org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.generateReport(CheckstyleReportGenerator.java:134)
> I built version 2.12-SNAPSHOT locally, the NPE still exists. Running with
> version 2.10 - no NPE. The code attempts to run Collections.sort on a null
> key in the ArrayList from checkstyle results.getFiles().keySet(). This area
> of code was not modified in any of the previous revisions going into release
> 2.11. The results Collection is populated from
> DefaultCheckstyleExecutor.executeChecks calling sinkListener.addDirectory,
> but that method code also did not change over the last year.
> This bug prevents us from using the latest checkstyle version. If the stack
> trace isn't enough to be able to add an extra null value check in
> executeChecks, I could run in debug mode and figure where the difference in
> values from 2.10 and 2.11 comes from, but it may be a little while before I
> can get to that.
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