I’m new to JDK 1.8 HashMap. Please help verify if my understanding is correct.

Short summary

This post explains that JDK 1.8 HashMap fixes the circular linked list infinite loop from JDK 1.7's concurrent resizing by using tail insertion, but does not resolve data loss during concurrent resizing. A detailed thread-interleaving scenario shows how Thread A can miss migrating node 5 after Thread B completes the full resize, causing permanent data loss. HashMap remains non-thread-safe and should not be used in concurrent contexts.

• •JDK 1.8 HashMap uses tail insertion to fix the circular linked list bug from JDK 1.7
• •Concurrent resizing still causes data loss when threads interleave during migration
• •HashMap remains non-thread-safe; use ConcurrentHashMap for concurrent access

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