Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via Oracle Community by 955865, 2 years ago
via GitHub by ItsHarry
, 2 years ago
This exception has no message.
via JIRA by Aleksandra Nenadic, 2 years ago
via JIRA by Stian Soiland-Reyes, 2 years ago
via Hibernate JIRA by Kenneth Flynn, 1 year ago
java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)	at java.util.HashMap$KeyIterator.next(HashMap.java:833)	at com.onesignal.OneSignalStateSynchronizer.generateJsonDiff(OneSignalStateSynchronizer.java:75)	at com.onesignal.OneSignalStateSynchronizer.access$200(OneSignalStateSynchronizer.java:46)	at com.onesignal.OneSignalStateSynchronizer$UserState.generateJsonDiff(OneSignalStateSynchronizer.java:261)	at com.onesignal.OneSignalStateSynchronizer$UserState.access$600(OneSignalStateSynchronizer.java:201)	at com.onesignal.OneSignalStateSynchronizer.syncUserState(OneSignalStateSynchronizer.java:474)	at com.onesignal.OneSignalStateSynchronizer$NetworkHandlerThread$1.run(OneSignalStateSynchronizer.java:438)	at android.os.Handler.handleCallback(Handler.java:808)	at android.os.Handler.dispatchMessage(Handler.java:103)	at android.os.Looper.loop(Looper.java:193)	at android.os.HandlerThread.run(HandlerThread.java:61)