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Can Java Static methods be synchronized?

static methods can be synchronized. There is only one copy of the static data you're trying to protect, so you only need one lock per class to synchronize static methods—a lock for the whole class. There is such a lock; every class loaded in Java has a corresponding instance of java.lang.Class representing that class. It's that java.lang.Class instance whose lock is used to protect the static methods of the class

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Kafka Consumer Parallelism

Kafka Parallel Consumer Options: Key-level parallelism:  Multiple threads process the messages from a single partition in parallel while ma...