Review

Modifying a collection after an Iterator has been created and continue to use the Iterator afterwards. Often happens with foreach loops. Found 2854 results 2016 for 'ConcurrentModificationException' on StackOverflow. Top 5% by relevance: - 18.August - 147 results Modifying the collection after creating the iterator http://stackoverflow.com/questions/223918/iterating-through-a-collection-avoiding-concurrentmodificationexception-when-re http://stackoverflow.com/questions/20818637/concurrentmodificationexception http://stackoverflow.com/questions/14994277/java-concurrentmodificationexception http://stackoverflow.com/questions/6790856/concurrentmodificationexception http://stackoverflow.com/questions/15444391/concurrentmodificationexception http://stackoverflow.com/questions/12793199/why-concurrentmodificationexception-in-arraylist http://stackoverflow.com/questions/17740858/concurrentmodificationexception-minigame http://stackoverflow.com/questions/1884889/iterating-over-and-removing-from-a-map http://stackoverflow.com/questions/23918707/understanding-concurrentmodificationexception http://stackoverflow.com/questions/28088085/arraylist-addall-concurrentmodificationexception http://stackoverflow.com/questions/24085674/spurious-concurrentmodificationexception http://stackoverflow.com/questions/34070915/java-concurrentmodificationexception http://stackoverflow.com/questions/25832790/odd-concurrentmodificationexception http://stackoverflow.com/questions/15811799/concurrentmodificationexception-woes http://stackoverflow.com/questions/1655362/concurrentmodificationexception-despite-using-synchronized http://stackoverflow.com/questions/2826380/concurrentmodificationexception-hashmap-in-java http://stackoverflow.com/questions/30892727/java-set-concurrentmodificationexception http://stackoverflow.com/questions/18773734/concurrentmodificationexception-when-using-iterators http://stackoverflow.com/questions/19726337/concurrentmodificationexception-in-unmodifiable-collection http://stackoverflow.com/questions/16245587/concurrentmodificationexception-on-iterator-next http://stackoverflow.com/questions/18069750/concurrentmodificationexception-with-weakhashmap http://stackoverflow.com/questions/8817608/concurrentmodificationexception-thrown-by-sublist http://stackoverflow.com/questions/1572178/guava-multimap-and-concurrentmodificationexception http://stackoverflow.com/questions/28009389/concurrentmodificationexception-using-iterator http://stackoverflow.com/questions/25842837/java-app-throws-concurrentmodificationexception http://stackoverflow.com/questions/32790162/iterator-but-still-concurrentmodificationexception http://stackoverflow.com/questions/24000285/concurrentmodificationexception-in-a-runnable http://stackoverflow.com/questions/25127203/concurrentmodificationexception-after-modifying-arraylist http://stackoverflow.com/questions/38408799/concurrentmodificationexception-when-getting-strings http://stackoverflow.com/questions/18344254/concurrentmodificationexception-in-hashset http://stackoverflow.com/questions/17527386/concurrentmodificationexception-in-playframework http://stackoverflow.com/questions/28806128/concurrentmodificationexception-not-happening http://stackoverflow.com/questions/23844906/concurrentmodificationexception-with-for-loop http://stackoverflow.com/questions/17582159/concurrentmodificationexception-when-invoking-putall http://stackoverflow.com/questions/6154448/iteration-over-a-list-concurrentmodificationexception http://stackoverflow.com/questions/9977658/concurrentmodificationexception-help-in-iterator http://stackoverflow.com/questions/4102850/another-concurrentmodificationexception-question http://stackoverflow.com/questions/15091937/list-throws-concurrentmodificationexception-but-set-does-not-throws-concurrentmo http://stackoverflow.com/questions/12474251/concurrentmodificationexception-for-java-linkedlist http://stackoverflow.com/questions/6090888/concurrentmodificationexception-in-android http://stackoverflow.com/questions/26133363/concurrentmodificationexception-but-no-modification http://stackoverflow.com/questions/21955506/concurrentmodificationexception-cannot-fix http://stackoverflow.com/questions/602636/concurrentmodificationexception-and-a-hashmap http://stackoverflow.com/questions/26955041/concurrentmodificationexception-in-arraylist http://stackoverflow.com/questions/27262602/possible-reason-for-concurrentmodificationexception http://stackoverflow.com/questions/23772782/getting-a-concurrentmodificationexception-chat-program http://stackoverflow.com/questions/6060913/is-throwing-concurrentmodificationexception-system-dependent http://stackoverflow.com/questions/10398579/concurrentmodificationexception-when-drawing-on-surfaceview http://stackoverflow.com/questions/12791190/concurrentmodificationexception-when-iterating-on-linkedlist http://stackoverflow.com/questions/32726074/concurrentmodificationexception-and-no-idea-why http://stackoverflow.com/questions/13001651/url-harvester-concurrency-issue-concurrentmodificationexception http://stackoverflow.com/questions/13602204/iterating-priority-queue-throws-concurrentmodificationexception http://stackoverflow.com/questions/38971688/how-to-avoid-concurrentmodificationexception-in-arraylist http://stackoverflow.com/questions/18314277/a-concurrentmodificationexception-thrown-without-a-modification http://stackoverflow.com/questions/6045229/concurrentmodificationexception-with-vector-and-clear http://stackoverflow.com/questions/18553556/collections-concurrentmodificationexception http://stackoverflow.com/questions/11094268/how-to-deal-with-concurrentmodificationexception http://stackoverflow.com/questions/3184883/concurrentmodificationexception-for-arraylist http://stackoverflow.com/questions/12216045/why-concurrentmodificationexception-is-not-thrown http://stackoverflow.com/questions/23170579/concurrentmodificationexception-when-deleting-an-element-from-arraylist http://stackoverflow.com/questions/27132013/concurrentmodificationexception-need-help-understanding-synchronized http://stackoverflow.com/questions/21430553/concurrentmodificationexception-in-arrayadapter-add-method http://stackoverflow.com/questions/23945433/unexpected-concurrentmodificationexception http://stackoverflow.com/questions/8812850/another-concurrentmodificationexception http://stackoverflow.com/questions/16722162/java-sibling-removal-throws-concurrentmodificationexception http://stackoverflow.com/questions/29723458/why-doesnt-this-code-throw-a-concurrentmodificationexception http://stackoverflow.com/questions/5795011/concurrentmodificationexception-java http://stackoverflow.com/questions/30724272/concurrentmodificationexception-persisting-even-with-listiterator http://stackoverflow.com/questions/20337622/concurrentmodificationexception-error http://stackoverflow.com/questions/17899738/java-concurrentmodificationexception-when-clearing-list-and-arraylist http://stackoverflow.com/questions/6614805/concurrentmodificationexception-on-single-threaded-code http://stackoverflow.com/questions/6596673/java-concurrentmodificationexception-while-iterating-over-list http://stackoverflow.com/questions/24043894/i-get-concurrentmodificationexception-when-adding-an-item http://stackoverflow.com/questions/29176838/concurrentmodificationexception-in-spite-of-using-iterator http://stackoverflow.com/questions/35618062/concurrentmodificationexception-when-using-hashmap-and-iterators http://stackoverflow.com/questions/36375944/concurrentmodificationexception-while-using-iterating-a-set http://stackoverflow.com/questions/16361056/i-got-concurrentmodificationexception-while-dealing-with-arraylists http://stackoverflow.com/questions/34655164/how-to-handle-concurrentmodificationexception-in-jsonarray-android http://stackoverflow.com/questions/24377001/is-this-solution-to-concurrentmodificationexception-safe http://stackoverflow.com/questions/10999388/why-iterator-throws-concurrentmodificationexception-on-add http://stackoverflow.com/questions/14673653/why-isnt-this-code-causing-a-concurrentmodificationexception http://stackoverflow.com/questions/24485348/reason-for-concurrentmodificationexception-on-arraylists-iterator-next http://stackoverflow.com/questions/24362210/concurrentmodificationexception-on-for-loop-on-java-util-set http://stackoverflow.com/questions/10542355/concurrentmodificationexception-on-removing-overlay-from-mapviews-overlaylist Asks for best practice on iterating collections while modifying them http://stackoverflow.com/questions/1066589/iterate-through-a-hashmap/1066603#1066603 http://stackoverflow.com/questions/2513509/how-to-remove-concurrentmodificationexception http://stackoverflow.com/questions/22223673/clarification-concurrentmodificationexception-in-hashmap http://stackoverflow.com/questions/22827865/no-concurrentmodificationexception-for-chm-why http://stackoverflow.com/questions/15703639/how-to-simulate-concurrentmodificationexception-in-own-class Threading issues http://stackoverflow.com/questions/17567743/concurrentmodificationexception http://stackoverflow.com/questions/3132970/mapview-concurrentmodificationexception http://stackoverflow.com/questions/34950553/concurrentmodificationexception-error http://stackoverflow.com/questions/6901093/concurrentmodificationexception-thrown-on-iterator-remove http://stackoverflow.com/questions/37977599/concurrentmodificationexception-android-asynctask http://stackoverflow.com/questions/840165/how-to-debug-concurrentmodificationexception http://stackoverflow.com/questions/30062570/concurrentmodificationexception-in-iterator-next http://stackoverflow.com/questions/38171389/parseobject-collectfetchedobjects-throws-concurrentmodificationexception http://stackoverflow.com/questions/22529945/concurrentmodificationexception-without-modifying-object http://stackoverflow.com/questions/16269402/concurrentmodificationexception-overlapping-two-activities http://stackoverflow.com/questions/38449225/concurrentmodificationexception-in-handler http://stackoverflow.com/questions/6293813/yet-another-concurrentmodificationexception-question http://stackoverflow.com/questions/13798028/concurrentmodificationexception-in-achartengine-android http://stackoverflow.com/questions/15324310/concurrentmodificationexception-in-a-loop http://stackoverflow.com/questions/30474037/concurrentmodificationexception-error-in-threadpooltaskexecutor http://stackoverflow.com/questions/12410093/concurrentmodificationexception-in-linkedlist http://stackoverflow.com/questions/6270110/concurrentmodificationexception-over-list http://stackoverflow.com/questions/13515214/concurrentmodificationexception-in-simple-game http://stackoverflow.com/questions/9224821/solving-a-concurrentmodificationexception http://stackoverflow.com/questions/7174844/concurrentmodificationexception-fix-problem http://stackoverflow.com/questions/20503627/concurrentmodificationexception-on-synchronized-method http://stackoverflow.com/questions/38095360/android-concurrentmodificationexception-persisting http://stackoverflow.com/questions/36499920/concurrentmodificationexception-in-android-asynctask http://stackoverflow.com/questions/30683070/java-threads-with-concurrentmodificationexception http://stackoverflow.com/questions/19101751/concurrentmodificationexception-on-androids-apache-basiccookiestore http://stackoverflow.com/questions/36362882/concurrentmodificationexception-objectoutputstream-writeobject http://stackoverflow.com/questions/19346140/already-synchronized-but-got-concurrentmodificationexception http://stackoverflow.com/questions/15229424/seeing-concurrentmodificationexception-in-mule-3-3-0 http://stackoverflow.com/questions/19164796/java-concurrentmodificationexception-even-with-synchronized http://stackoverflow.com/questions/13917264/ways-to-avoid-iterator-concurrentmodificationexception http://stackoverflow.com/questions/9251761/mapview-concurrentmodificationexception-when-updating-overlays http://stackoverflow.com/questions/36487053/java-concurrentmodificationexception-problems-with-classes http://stackoverflow.com/questions/19622773/list-concurrentmodificationexception http://stackoverflow.com/questions/13907747/resolving-concurrentmodificationexception-from-modifying-overlays http://stackoverflow.com/questions/23017332/multithread-concurrentmodificationexception http://stackoverflow.com/questions/7809800/do-we-need-to-solve-concurrentmodificationexception http://stackoverflow.com/questions/34581174/java-example-code-for-generating-a-concurrentmodificationexception http://stackoverflow.com/questions/10399033/concurrentmodificationexception-with-android-and-opengl-es-1-1 http://stackoverflow.com/questions/6854635/concurrentmodificationexception-when-iterating-keys-of-a-hashmap Unknown cause http://stackoverflow.com/questions/34062920/titan-concurrentmodificationexception http://stackoverflow.com/questions/9027413/java-concurrentmodificationexception http://stackoverflow.com/questions/28571909/concurrentmodificationexception-with-arraylist-iterator http://stackoverflow.com/questions/25104982/parseobject-mergerest-raise-concurrentmodificationexception http://stackoverflow.com/questions/25826669/nested-cforeach-gives-concurrentmodificationexception http://stackoverflow.com/questions/13057239/gae-concurrentmodificationexception-while-commiting http://stackoverflow.com/questions/31188209/jena-concurrentmodificationexception-on-datasetgraph-clear http://stackoverflow.com/questions/36428491/concurrentmodificationexception-in-postupdatelistener http://stackoverflow.com/questions/15067607/concurrentmodificationexception-although-locklocktype-read-annotation http://stackoverflow.com/questions/23118728/android-listiterator-concurrentmodificationexception-only-reading http://stackoverflow.com/questions/8099960/concurrentmodificationexception-thrown-by-java-code http://stackoverflow.com/questions/16862206/paintcomponent-concurrentmodificationexception http://stackoverflow.com/questions/27571239/concurrentmodificationexception-in-a-java-game Third Party Library http://stackoverflow.com/questions/11534424/hibernate-throwing-a-concurrentmodificationexception http://stackoverflow.com/questions/9076207/concurrentmodificationexception-using-richfaces-extendeddatatable http://stackoverflow.com/questions/29569532/singleconnectionfactory-raises-concurrentmodificationexception http://stackoverflow.com/questions/9661407/transactions-and-concurrentmodificationexception-documentation-ambiguity http://stackoverflow.com/questions/30486827/grails-concurrentmodificationexception-in-custom-eventlistener http://stackoverflow.com/questions/18933253/spring-security-inserting-acls-concurrentmodificationexception

Modify the collection via the Iterator.

• superfluous/call

CME.java

misuse(Collection)

class CME {
  public void misuse(Collection<Object> c) {
  	Iterator<Object> i = c.iterator();
  	c.add(new Object());
  	if (i.hasNext())
  		i.next();
  }

}

public class DoNotModify {
  public void pattern(Collection<Object> c, Object element) {
  	Iterator<Object> i = c.iterator();
  	if (i.hasNext())
  		i.next();
  }
}