Trying to modify a HashMap directly while iterating over it

We found this prefix in 964 webpages.
MapChildren (9)Typical messages (47)TraceDetailed Map
  1. java.util.ConcurrentModificationException
    1.   at java.util.HashMap$HashIterator.nextEntry()
  1. ConcurrentModificationException

    HashMap$KeyIterator.next()
    Crashes:633
    Projects:0
    Web Pages:561
    Error Reports:0
    First:10 months ago
    Last:7 months ago
    preview
  2. ConcurrentModificationException

    HashMap$EntryIterator.next()
    Crashes:249
    Projects:0
    Web Pages:223
    Error Reports:0
    First:10 months ago
    Last:7 months ago
    preview
  3. ConcurrentModificationException

    HashMap$ValueIterator.next()
    Crashes:202
    Projects:0
    Web Pages:181
    Error Reports:0
    First:10 months ago
    Last:7 months ago
    preview
  4. Mozilla Firefox Release Notes

    First:1 year ago
    Last:1 year ago
  5. Mozilla Firefox Release Notes

    First:1 year ago
    Last:1 year ago
  6. Bamboo doesn't shutdown occasionally, breaking the tests

    First:9 years ago
    Last:2 years ago
    Author:Don Brown
  7. ConcurrentModificationException - Tekkit Classic - Technic Forums

    First:3 years ago
    Last:3 years ago
  8. Java ConcurrentModificationException when calling OAAM API updates hashmap - com.bharosa.vcrypt.tracker.impl.VCryptTrackerFilterImpl.createTransaction(VCryptTrackerFilterImpl)

    First:3 years ago
    Last:2 years ago
    Author:User534088-OC
  9. [cas-user] Ehcache limitation?

    First:4 years ago
    Last:1 year ago
    Author:Tom Poage
MessageNumber of crashes
<No message>871
null18
Failed to execute runnable (java.util.ConcurrentModificationException)9
java.util.ConcurrentModificationException8
Error creating bean with name 'template': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext': Invocation of init method failed; nested exception is ja4
Failed to serialize element due to ConcurrentModificationException. This is frequently the result of inappropriately sharing thread unsafe object (eg. ArrayList, HashMap, etc) between threads3
[B4117]: Unexpected Broker Exception: [Unexpected Error processing message]3
Ticking player2
Plugin OpenAnalytics v1.0.03 generated an exception while executing task 282
Unable to get class name from value com.liferay.portlet.messageboards.model.MBThread2
  1. java.util.ConcurrentModificationException
    1.   at java.util.HashMap$HashIterator.nextEntry()