Web Reference: Jul 12, 2025 · If we invoke a sequence of methods on an object that violates its contract, then the object throws ConcurrentModificationException. For example: if while iterating over the collection, we directly try to modify that collection, then the given fail-fast iterator will throw this ConcurrentModificationException. Jul 6, 2016 · To help programmers, some implementations of those Collection classes attempt to detect erroneous concurrent modification, and throw a ConcurrentModificationException if they detect it. However, it is in general not possible and practical to guarantee detection of all concurrent modifications. In this article, we’ll take a look at the ConcurrentModificationException class. First, we’ll give an explanation how it works, and then prove it by using a test for triggering it. Finally, we’ll try out some workarounds by using practical examples.
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