I'm running maven 2.2.1, Checkstyle plugin 2.5 and I'm running into this exact same problem:
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error during page generation
Embedded error: Error rendering Maven report: Failed during checkstyle configuration
Unable to instantiate GenericIllegalRegexpCheck
Our Module is configured as follows:
<module name="GenericIllegalRegexp">
<property name="format" value="System\.out\.print"/>
<property name="message" value="System.out.print not allowed"/>
</module>
This is just like the example checkstyle gives in their documentation.
Full output here:
Unable to instantiate GenericIllegalRegexpCheck
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error during page generation
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387
)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
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:592)
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:114)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
... 17 more
Caused by: org.apache.maven.doxia.siterenderer.RendererException: Error rendering Maven report: Failed during checkstyle conf
iguration
at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:174)
at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:328)
at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:132)
at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:142)
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:109)
... 19 more
Caused by: org.apache.maven.reporting.MavenReportException: Failed during checkstyle configuration
at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:591)
at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:131)
at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:164)
... 23 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: cannot initialize module TreeWalker - Unable to instantia
te GenericIllegalRegexp
at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:177)
at com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:207)
at org.apache.maven.plugin.checkstyle.DefaultCheckstyleExecutor.executeCheckstyle(DefaultCheckstyleExecutor.java:176)
at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:576)
... 25 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable to instantiate GenericIllegalRegexp
at com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:156)
at com.puppycrawl.tools.checkstyle.TreeWalker.setupChild(TreeWalker.java:159)
at com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:207)
at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:156)
... 28 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable to instantiate GenericIllegalRegexpCheck
at com.puppycrawl.tools.checkstyle.PackageObjectFactory.doMakeObject(PackageObjectFactory.java:99)
at com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:153)
... 31 more
[INFO] ------------------------------------------------------------------------
Seeing mms.suppressions.file=$
{basedir}/../../project/resources/checkstyle/suppressions.xml
I can see that you have a multi-module project, and you are attempting to set up a project relative xml definition.
This is undesired, and unsupported by the maven 2.0 checkstyle plugin.
Use the advice provided in http://maven.apache.org/plugins/maven-checkstyle-plugin/customize.html to setup a Custom Checkstyle build tools jar.
This will provide maximum reuse and proper isolation between components.
As well as being supported by continuous integration servers.
Using the build tools advice, and a parent pom, will result in less work for yourself.