JDK 1.8 HashMap fixes infinite loop bug but remains unsafe for concurrent use

JDK 1.8's HashMap addressed the circular linked list infinite loop problem from JDK 1.7 by switching to a tail insertion method during resizing, but it did not resolve all thread-safety issues. When multiple threads resize the map simultaneously, data loss and overwriting can still occur. In a documented scenario, two concurrent threads reading the same old table array during resize can cause one thread to miss nodes already migrated by the other. As a result, certain elements are permanently lost when the resized array is written back to the shared table reference. Developers are advised to use thread-safe alternatives like ConcurrentHashMap for concurrent workloads.