[ http://jira.codehaus.org/browse/MCHECKSTYLE-10?page=comments#action_54283 
] 

Carlos Sanchez commented on MCHECKSTYLE-10:
-------------------------------------------

Workaround:

Add extensions to your build section

        <extensions>
            <extension>
                <groupId>checkstyle</groupId>
                <artifactId>checkstyle</artifactId>
                <version>4.1</version>
            </extension>
        </extensions>


unfortunately that causes another problem


[INFO] org.apache.commons.logging.LogConfigurationException: 
org.apache.commons.logging.LogConfigurationException: Class 
org.apache.commons.logging.impl.Log4JLogger does not implement Log
[INFO] 
----------------------------------------------------------------------------
[DEBUG] Trace
org.apache.commons.logging.LogConfigurationException: 
org.apache.commons.logging.LogConfigurationException: 
org.apache.commons.logging.LogConfigurationException: Class 
org.apache.commons.logging.impl.Log4JLogger does not implement Log
        at 
org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:532)
        at 
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:272)
        at 
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:246)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:395)
        at 
org.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:130)
        at 
com.puppycrawl.tools.checkstyle.api.AutomaticBean.createBeanUtilsBean(AutomaticBean.java:73)
        at 
com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:150)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeCheckstyle(CheckstyleReport.java:632)
        at 
org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:457)
        at 
org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
        at 
org.apache.maven.plugins.site.SiteMojo.generateReportsPages(SiteMojo.java:922)
        at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:361)
        at 
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:414)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:531)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:472)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:451)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:303)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:270)
        at 
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:139)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.commons.logging.LogConfigurationException: 
org.apache.commons.logging.LogConfigurationException: Class 
org.apache.commons.logging.impl.Log4JLogger does not implement Log
        at 
org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:416)
        at 
org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:525)
        ... 29 more
Caused by: org.apache.commons.logging.LogConfigurationException: Class 
org.apache.commons.logging.impl.Log4JLogger does not implement Log
        at 
org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:412)
        ... 30 more



> Exception when creating Checkstyle report as part of a 'site' build
> -------------------------------------------------------------------
>
>          Key: MCHECKSTYLE-10
>          URL: http://jira.codehaus.org/browse/MCHECKSTYLE-10
>      Project: Maven 2.x Checkstyle Plugin
>         Type: Bug

>     Versions: 2.0-beta-2
>  Environment: Windows XP, JDK 1.4.2_10, Maven 2.0.2-SNAPSHOT, 
> maven-checkstyle-plugin 2.0-beta-2-SNAPSHOT
>     Reporter: Nick Giles
>     Priority: Blocker
>      Fix For: 2.0-beta-2
>  Attachments: error_trace.txt
>
>
> When attempting to create a project site including a checkstyle report, the 
> build fails with the attached stack trace. However, when creating a 
> checkstyle report simply by running 'mvn checkstyle:checkstyle', the build is 
> successful and the report is produced.
> From some initial investigation, it appears that the classloader passed in to 
> checkstyle itself by the plugin can locate essential resources when the build 
> is specifically for checkstyle, but cannot locate them when it is invoked as 
> part of a call for 'site'. This can be tested by adding the following lines 
> of code into 
> org.apache.maven.plugin.checkstyle.CheckstyleReport.getModuleFactory(), where 
> 'loader' is the ClassLoader being passed to the PackageNamesLoader:
>       getLog().info("\n\n\n\nClass loader: " + loader.getClass().getName());
>       getLog().info("Input stream: " + 
> loader.getResourceAsStream("com/puppycrawl/tools/checkstyle/checkstyle_packages.xml"));
>       getLog().info("DTD: " + 
> loader.getResourceAsStream("com/puppycrawl/tools/checkstyle/packages_1_0.dtd"));
> These should show jar file URLs if found, and null if not, which will happen 
> respectively when run as 'mvn checkstyle:checkstyle' and 'mvn site'.

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