TestList.remove(testList.indexOf(currElement)) īut following code works just fine: // process collectionįor (int i = 0 i < testList. : .cli.HiveSQLException: Error while compiling statement: FAILED: ConcurrentModificationException null : .cli. There are mainly two types of exception in java as follows: Checked Exceptions are the exceptions that are checked by the compiler for the smooth execution of the program at runtime is called a checked exception. SomeClass founDuplicate = findDuplicates(currElement) This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible. public class ConcurrentModificationException extends RuntimeException. Direct Known Subclasses: DirectoryIteratorException. Of course, this is easier said than done. But, unfortunately as we can see, it produced more problems than profits, otherwise this topic would not arise.įor example, this code will lead to when entering next iteration on modified ArrayList: // process collection All Implemented Interfaces: Serializable. Use a fail-safe collection class that will not throw the ConcurrentModificationException Simply catch the ConcurrentModificationException, log the error, and move on The obvious way to fix Java’s ConcurrentModificationException is to not concurrently modify a collection. Mediante esta lnea: datosTrayectos.add (new Trayecto ()) Por lo tanto, el iterador, al detectar que se ha modificado la lista, no puede garantizar que itere por todos los datos correctamente. Mediante esta línea: datosTrayectos.add (new Trayecto ()) Por lo tanto, el iterador, al detectar que se ha modificado la lista, no puede garantizar que itere por todos los datos correctamente. If a thread modifies a collection directly while it is iterating over the collection with a fail-fast iterator, the iterator will throw this ConcurrentModificationException. Solution is much simpler: try to use canonical for loop instead of for-each loop.Īccording to Java copyright owners (some years ago Sun, now Oracle) for-each loop guide, it uses iterator to walk through collection and just hides it to make code looks better. 9 Esto se debe a que ests intentando aadir elementos a tu lista mediante la cual has creado el iterador a la vez que ests iterando a travs de este. ConcurrentModificationException has thrown by methods that have detected concurrent modification of an object when such modification is not permissible. * any subsequent elements to the right (adds one to their indices).In single threated tasks you don't need to use Iterator, moreover, CopyOnWriteArrayList (due to performance hit). Shifts the element currently at that position (if any) and The ConcurrentModificationException is used to fail-fast when something being iterated on is modified. * Inserts the specified element at the specified position in this The ConcurrentModificationException is a very common exception in Java that occurs usually while working with Collections. modCount is incremented in cases of use put/get (add/remove) nextEntry method of iterator is checking this value with current modCount if they are different concurrent modification exception is throw. When you try to modify any collection class during the traversal the compiler throw ConcurrentModificationException. a counter expectedModCount is created and is set to value of modCount as entry checkpoint. You may be faced with it when you work with Collection classes of Java.
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