Concurrent Modification Exception
Hello,
i got this Exception while deleting objects from an ArrayList.
I marked the spot where the error occured (as NetBeans say)
with an ->
//per UnitOfWorkInstance
private List<AbstractDomainObject> newObjects =new ArrayList<AbstractDomainObject>();
private List<AbstractDomainObject> dirtyObjects =new ArrayList<AbstractDomainObject>();
private List<AbstractDomainObject> removedObjects =new ArrayList<AbstractDomainObject>();
//Rollback the Transaction
publicvoid rollback(){
reloadDirty();
deleteNew();
restoreDeleted();
}
privatevoid deleteNew(){
->for(AbstractDomainObject object: newObjects){
logger.info(object.toString());
newObjects.remove(object);
}
}
privatevoid restoreDeleted(){
for(AbstractDomainObject object: removedObjects){
logger.info(object.toString());
//Add back into idmap!
IDMapRegistry.getMap(object.getClass()).addEntity(object);
}
}
privatevoid reloadDirty(){
for(AbstractDomainObject object: dirtyObjects){
logger.info(object.toString());
//object reloads its data from database
object.renew();
}
}
I dont know much about this exception, but if it has anything to do
whith threads. Iam not using additional threads at all!
Maybe i despite should synchronize all these methods?
Would that solve the problem?
I would really appreciate ur help
Thanks in advance
Yves
--
Here is the Stack-Trace:
Exception occurred during event dispatching:
java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at de.yvestiesler.DataMapper.UnitOfWork.UnitOfWork.deleteNew(UnitOfWork.java:203)
at de.yvestiesler.DataMapper.UnitOfWork.UnitOfWork.rollback(UnitOfWork.java:197)
at de.yvestiesler.GUI.Frames.PositionManagement.PresentationModelPositionManagement.cancelAction(PresentationModelPositionManagement.java:73)
at de.yvestiesler.GUI.Frames.PositionManagement.ViewPositionManagement.btnCancelActionPerformed(ViewPositionManagement.java:359)
at de.yvestiesler.GUI.Frames.PositionManagement.ViewPositionManagement.access$400(ViewPositionManagement.java:23)
at de.yvestiesler.GUI.Frames.PositionManagement.ViewPositionManagement$3.actionPerformed(ViewPositionManagement.java:143)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:177)
at java.awt.Dialog$1.run(Dialog.java:1039)
at java.awt.Dialog$3.run(Dialog.java:1091)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1089)
at java.awt.Component.show(Component.java:1419)
at java.awt.Component.setVisible(Component.java:1372)
at java.awt.Window.setVisible(Window.java:801)
at java.awt.Dialog.setVisible(Dialog.java:979)
at de.yvestiesler.GUI.Frames.PositionManagement.ViewPositionManagement$12.run(ViewPositionManagement.java:403)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
