java.util.ConcurrentModificationException

There are no available Samebug tips for this exception. Do you have an idea how to solve this issue? A short tip would help users who saw this issue last week.

  • A ConcurrentModificationException is being thrown while Hibernate is flushing changes to the database. Specifically, it occurs while it is persisting new "collections" (i.e. one-to-many) entities. Stacktrace: java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:353) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:279) at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214) at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986) I do have a Post-Insert, Update, Collection Recreate, Collection Update listener where ConcurrentModificationException is only occurring if this listener is in place. However, the listener and actions it takes doesn't modify any entities or make save changes. So I am bit miffed. This is occurring in what appears to be a single threaded environment. At the very least the entity manager is thread local which means the hibernate events list shouldn't be modified concurrently. It leads me to believe that the list is being modified within the for loop somehow...
    via by Justin DeWind,
  • A ConcurrentModificationException is being thrown while Hibernate is flushing changes to the database. Specifically, it occurs while it is persisting new "collections" (i.e. one-to-many) entities. Stacktrace: java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:353) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:279) at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214) at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986) I do have a Post-Insert, Update, Collection Recreate, Collection Update listener where ConcurrentModificationException is only occurring if this listener is in place. However, the listener and actions it takes doesn't modify any entities or make save changes. So I am bit miffed. This is occurring in what appears to be a single threaded environment. At the very least the entity manager is thread local which means the hibernate events list shouldn't be modified concurrently. It leads me to believe that the list is being modified within the for loop somehow...
    via by Justin DeWind,
  • Kryo Serializing error
    via GitHub by kwon37xi
    ,
    • java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:353) at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:279) at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214) at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:986)

    Users with the same issue

    Unknown visitor1 times, last one,
    Unknown visitor1 times, last one,
    Unknown visitor1 times, last one,
    Unknown visitor1 times, last one,
    Pilleo
    4 times, last one,