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java.lang.NullPointerException: 	at java.util.regex.Matcher.getTextLength(Matcher.java:1234)	at java.util.regex.Matcher.reset(Matcher.java:308)	at java.util.regex.Matcher.(Matcher.java:228)	at java.util.regex.Pattern.matcher(Pattern.java:1088)	at hudson.FilePath.normalize(FilePath.java:250)	at hudson.FilePath.(FilePath.java:196)	at hudson.plugins.checkstyle.CheckStyleReporter.getFileName(CheckStyleReporter.java:128)	at hudson.plugins.checkstyle.CheckStyleReporter.perform(CheckStyleReporter.java:123)	at hudson.plugins.analysis.core.HealthAwareReporter.postExecute(HealthAwareReporter.java:313)	at hudson.maven.Maven3Builder$MavenExecutionListener.recordMojoEnded(Maven3Builder.java:453)	at hudson.maven.Maven3Builder$MavenExecutionListener.mojoSucceeded(Maven3Builder.java:435)	at org.apache.maven.lifecycle.internal.DefaultExecutionEventCatapult.fire(DefaultExecutionEventCatapult.java:87)	at org.apache.maven.lifecycle.internal.DefaultExecutionEventCatapult.fire(DefaultExecutionEventCatapult.java:42)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:228)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)	at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)	at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:158)	at hudson.maven.Maven3Builder.call(Maven3Builder.java:100)	at hudson.maven.Maven3Builder.call(Maven3Builder.java:66)	at hudson.remoting.UserRequest.perform(UserRequest.java:118)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:326)	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)