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java.lang.IllegalStateException: Unable to load core plugin	at edu.umd.cs.findbugs.PluginLoader.loadCorePlugin(PluginLoader.java:1423)	at edu.umd.cs.findbugs.PluginLoader.loadInitialPlugins(PluginLoader.java:1373)	at edu.umd.cs.findbugs.PluginLoader.(PluginLoader.java:156)	at edu.umd.cs.findbugs.DetectorFactoryCollection.getCoreResource(DetectorFactoryCollection.java:360)	at edu.umd.cs.findbugs.SystemProperties.loadPropertiesFromConfigFile(SystemProperties.java:72)	at edu.umd.cs.findbugs.SystemProperties.(SystemProperties.java:55)	at edu.umd.cs.findbugs.SortedBugCollection.(SortedBugCollection.java:189)	at hudson.plugins.findbugs.parser.FindBugsParser.readXml(FindBugsParser.java:282)	at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:221)	at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:159)	at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:138)	at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:105)	at hudson.plugins.analysis.core.FilesParser.parseFile(FilesParser.java:306)	at hudson.plugins.analysis.core.FilesParser.parseFiles(FilesParser.java:264)	at hudson.plugins.analysis.core.FilesParser.parserCollectionOfFiles(FilesParser.java:215)	at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:184)	at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:31)	at hudson.FilePath.act(FilePath.java:914)	at hudson.FilePath.act(FilePath.java:887)	at hudson.plugins.findbugs.FindBugsReporter.perform(FindBugsReporter.java:179)	at hudson.plugins.analysis.core.HealthAwareReporter.postExecute(HealthAwareReporter.java:315)	at hudson.maven.Maven3Builder$MavenExecutionListener.recordMojoEnded(Maven3Builder.java:628)	at hudson.maven.Maven3Builder$MavenExecutionListener.mojoSucceeded(Maven3Builder.java:610)	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:117)	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:616)	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:178)	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:616)	at hudson.maven.Maven3Builder.call(Maven3Builder.java:134)	at hudson.maven.Maven3Builder.call(Maven3Builder.java:69)	at hudson.remoting.UserRequest.perform(UserRequest.java:118)	at hudson.remoting.UserRequest.perform(UserRequest.java:48)	at hudson.remoting.Request$2.run(Request.java:328)	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:1146)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:679)