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From "Bob Fields (JIRA)" <>
Subject [jira] (MCHECKSTYLE-205) NPE in CheckstyleReportGenerator.doFilesSummary:654 version 2.11 regression
Date Thu, 05 Dec 2013 22:46:45 GMT
Bob Fields created MCHECKSTYLE-205:

             Summary: NPE in CheckstyleReportGenerator.doFilesSummary:654 version 2.11 regression
                 Key: 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

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(
	at java.lang.String.compareTo(
	at java.util.ComparableTimSort.countRunAndMakeAscending(
	at java.util.ComparableTimSort.sort(
	at java.util.ComparableTimSort.sort(
	at java.util.Arrays.sort(
	at java.util.Collections.sort(
	at org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.doFilesSummary(
	at org.apache.maven.plugin.checkstyle.CheckstyleReportGenerator.generateReport(

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

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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