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  1. ,
    via javacodegeeks.com by Unknown author

    Causes : The Collection is internally modified, while a thread is iterating over it. OR after the creation of an iterator, the Collection is internally modified by any method other than the iterator’s own methods for removal and addition.

  2. ,
    via oracle.com by Unknown author

    In order to avoid more than one threads accessing or modifying the same object, you can synchronize them over the object, in order to allow only one thread to manipulate it over time.

Solutions on the web

via GitHub by dhazelett
, 1 year ago
This exception has no message.
via GitHub by LordEpos
, 9 months ago
via GitHub by jvasileff
, 2 years ago
via MuleSoft JIRA by Guillermo Fernandes, 7 months ago
via Stack Overflow by Ashish Ratan
, 1 year ago
java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) at java.util.ArrayList$Itr.next(ArrayList.java:851) at com.jiyuanime.listener.ActivatePowerDocumentListener.destroy(ActivatePowerDocumentListener.java:127) at com.jiyuanime.ActivatePowerModeManage.destroyDocumentListener(ActivatePowerModeManage.java:145) at com.jiyuanime.ActivatePowerModeManage.destroy(ActivatePowerModeManage.java:112) at com.jiyuanime.ActivatePowerModeApplicationPlugin$1.projectClosed(ActivatePowerModeApplicationPlugin.java:33) at com.intellij.openapi.project.impl.ProjectManagerImpl.i(ProjectManagerImpl.java:672) at com.intellij.openapi.project.impl.ProjectManagerImpl.a(ProjectManagerImpl.java:571) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:934) at com.intellij.openapi.project.impl.ProjectManagerImpl.closeProject(ProjectManagerImpl.java:568) at com.intellij.openapi.project.impl.ProjectManagerImpl.closeAndDispose(ProjectManagerImpl.java:592) at com.intellij.ide.impl.ProjectUtil.closeAndDispose(ProjectUtil.java:89) at com.intellij.openapi.wm.impl.IdeFrameImpl$4.windowClosing(IdeFrameImpl.java:263) at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349) at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349) at java.awt.Window.processWindowEvent(Window.java:2054) at javax.swing.JFrame.processWindowEvent(JFrame.java:305) at java.awt.Window.processEvent(Window.java:2013) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at com.intellij.ide.IdeEventQueue.e(IdeEventQueue.java:843) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:679) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:391) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)