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The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class: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.最后，林聪终于忍不住了。Interface News Executive Series: 10 million yuan has been prepared this year, and there is no ceiling on a single award.一丝的纯情叙述了在江南歪曲的课外辅导热潮中，沉迷在子女教育问题的一名家庭主妇，与偶尔相遇的牙科医生堕入爱情的故事。2. Take an examination of psychology and pedagogy (generally, there are remedial classes at the registration point, and the teacher will help you draw the key points, but you must memorize them, because these key points can only ensure that you are on the verge of passing the exam; The examination is held every six months and the results can be retained for three years, so it is better to go through customs at one time. When taking an examination of psychology and education, you must sign up for the examination grade-preschool teacher/primary school/junior high school/senior high school (higher vocational)/university. Your educational background must be one level higher than your registration grade. EG must have a college degree or above if you want to teach senior high school. In addition, the university teaching certificate is provided to the university in-service teachers for examination)