custom check

I created a custom check called TestNGTestHasGroup. When I try to use
it, I keep getting an error that says:

Embedded error: Error rendering Maven report: Failed during checkstyle
configuration
Unable to instantiate TestNGTestHasGroupCheck

I get the following stack trace:

[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error during
page generation
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:564)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:480)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:459)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:311)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:278)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:143)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:334)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:125)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:280)
        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.maven.plugin.MojoExecutionException: Error
during page generation
        at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:97)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:443)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:539)
        ... 16 more
Caused by: org.apache.maven.doxia.siterenderer.RendererException:
Error rendering Maven report: Failed during checkstyle configuration
        at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:71)
        at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:239)
        at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:115)
        at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:124)
        at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:92)
        ... 18 more
Caused by: org.apache.maven.reporting.MavenReportException: Failed
during checkstyle configuration
        at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:488)
        at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
        at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:67)
        ... 22 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException:
cannot initialize module TreeWalker - Unable to instantiate
TestNGTestHasGroup
        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:723)
        at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:484)
        ... 24 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException:
Unable to instantiate TestNGTestHasGroup
        at com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:152)
        at com.puppycrawl.tools.checkstyle.TreeWalker.setupChild(TreeWalker.java:213)
        at com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:209)
        at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:144)
        ... 27 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException:
Unable to instantiate TestNGTestHasGroupCheck
        at com.puppycrawl.tools.checkstyle.PackageObjectFactory.doMakeObject(PackageObjectFactory.java:94)
        at com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:149)
        ... 30 more

I have tried having the classname end with "Check" and without the
classname ending with "Check" but nothing seems to work. I don't get a
maven dependency error, so I assume that the jar file is being
resolved to the classpath. I set up the jar structure as in the
Checkstyle documentation. I'm baffled. I'm sure it something simple,
that I'm just doing wrong. Any help would be appreciated.

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