Hi,
I'm trying to integrate a checkstyle report in a maven project, but I'm
facing a problem. The checkstyle report is based on a custom checkstyle
check module I developed.
I'm using maven 2.0.9, maven-checkstyle-plugin 2.1, and checkstyle 4.3
When I execute mvn checkstyle:checkstyle or mvn site, I get the following
exception. I don't really understand why the TreeWalker can't be
instantiated.
Any help would be great!
[ERROR] BUILD ERROR
[INFO]
------------------------------------------------------------------------
[INFO] An error has occurred in Checkstyle report generation.
Embedded error: Failed during checkstyle configuration
Unable to instantiate TreeWalkerCheck
[INFO]
------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: An error has
occurred in Checkstyle report generation.
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:583)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:615)
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: An error has
occurred in Checkstyle report generation.
at
org.apache.maven.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:79)
at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
... 16 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.reporting.AbstractMavenReport.execute(AbstractMavenReport.java:73)
... 18 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: cannot
initialize module TreeWalker - Unable to instantiate TreeWalker
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)
... 20 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable
to instantiate TreeWalker
at
com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:152)
at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:140)
... 23 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable
to instantiate TreeWalkerCheck
at
com.puppycrawl.tools.checkstyle.PackageObjectFactory.doMakeObject(PackageObjectFactory.java:94)
at
com.puppycrawl.tools.checkstyle.PackageObjectFactory.createModule(PackageObjectFactory.java:149)
... 24 more
