java.util.ConcurrentModificationException: This exception has no message.

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This exception has no message.
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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$EntryIterator.next(HashMap.java:1471)
at com.mebigfatguy.fbcontrib.detect.OverlyPermissiveMethod.report(OverlyPermissiveMethod.java:219)
at edu.umd.cs.findbugs.DetectorToDetector2Adapter.finishPass(DetectorToDetector2Adapter.java:55)
at edu.umd.cs.findbugs.FindBugs2.analyzeApplication(FindBugs2.java:1127)
at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.executeImpl(FindBugsStarter.java:354)
at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.asyncStartImpl(FindBugsStarter.java:245)
at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.asyncStart(FindBugsStarter.java:218)
at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter.access$300(FindBugsStarter.java:74)
at org.twodividedbyzero.idea.findbugs.core.FindBugsStarter$3.run(FindBugsStarter.java:202)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)
at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:142)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:446)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:392)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:127)
at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:126)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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