Java Mistakes: Singleton Pattern, thread-safety issues

The Singleton Pattern ensures a single instance of a class, but the implementation must be thread-safe to be implemented properly.

In Java you can use synchronization mechanism like the synchronized keyword, or you can rely on the JVM initialization specs. check out the documentation at https://docs.oracle.com/javase/specs/jls/se17/html/jls-12.html#jls-12.4.1

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