What is @Synchronized used for?

@Synchronized is Lombok's safer alternative to Java's built-in synchronized keyword on a method: instead of locking on this (or the class object for a static method), which exposes the lock to any external code that also happens to synchronize on the same object, Lombok generates a private, dedicated lock field that only this class's own generated code touches.

@Synchronized
public void increment() {
    counter++;
}
//  generates a private final Object lock = new Object();
//  and wraps the method body in synchronized(lock) { ... }

This avoids a subtle but real risk with plain synchronized methods: since this is a public, externally-visible reference, any other code that happens to synchronize on the same instance could unintentionally interact with (or deadlock against) your class's own internal locking, something a private, dedicated lock object entirely avoids.

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