regression: report generation doesn't work while dealing with the header file
-----------------------------------------------------------------------------

         Key: MCHECKSTYLE-48
         URL: http://jira.codehaus.org/browse/MCHECKSTYLE-48
     Project: Maven 2.x Checkstyle Plugin
        Type: Bug

 Environment: Checkstyle 2.2-SNAPSHOT rev 419829.
    Reporter: Jerome Lacoste
    Priority: Blocker
 Attachments: mvn.log

Configured as is:

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-checkstyle-plugin</artifactId>
        <configuration>
          <configLocation>config/maven_checks.xml</configLocation>
        </configuration>
      </plugin>

Checkstyle stopped working. I made a fresh svn update and mvn 
checkstyle:checkstyle fails with:

[...]
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: cannot 
initialize module TreeWalker - Cannot set property 'headerFile' in module 
RegexpHeader to 
'/home/jerome/Dev/OSS/perso/jar-info/target/checkstyle-header.txt': line 24 in 
header specification is not a regular expression
        at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:165)
        at 
com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:209)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeCheckstyle(CheckstyleReport.java:729)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:490)
[...]
Caused by: org.apache.commons.beanutils.ConversionException: line 24 in header 
specification is not a regular expression
        at 
com.puppycrawl.tools.checkstyle.checks.header.RegexpHeaderCheck.initHeaderRegexps(RegexpHeaderCheck.java:116)
        at 
com.puppycrawl.tools.checkstyle.checks.header.RegexpHeaderCheck.setHeaderFile(RegexpHeaderCheck.java:85)
        ... 34 more

Full log attached.

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