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秦淼笑问大家：这东西味道怎么样？大家都赞好，说吃了透心凉，舒坦。During the process, the participants shall not interfere with the competition of other teams. Otherwise, the competition will be disqualified.In my program, I just started embedded cassandra and used cassandra-driver-core to connect to cassandra, so UDP socket was occupied a lot at once, and redisson needed to initialize its own connection pool when starting, which also needed UDP socket, thus causing this problem. Netty's ClassCastException ate the real exception, making it more difficult to troubleshoot this problem.小葱心往下沉，正要和鲁三去李家看看，迎面来了魏铁。不就是激将法吗？我才懒得跟你们说。Dependence Inversion Principle (DIP) means that abstraction should not depend on details, and details should depend on abstraction, which is the proposed "interface-oriented programming, not implementation-oriented programming". This can reduce the coupling between customers and specific implementations.