已解决com.mysql.cj.jdbc.exceptions.CommunicationsException异常的正确解决方法，亲测有效！！！ mysql 数据库 Communications Exception Error bug 异常处理
记录Bug：idea连接数据库报错DBMS: MySQL (no ver.) Case sensitivity: plain=mixed, delimited=exact [28000][1045] bug intellij-idea
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