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Caused by: java.lang.NullPointerException at com.mysql.cj.AbstractQuery.stopQueryTimer(AbstractQuery.java:217) at com.mysql.cj.jdbc.StatementImpl.stopQueryTimer(StatementImpl.java:657) at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1229) at com.alibaba.druid.pool.DruidPooledStatement.executeQuery(DruidPooledStatement.java:297) 看着像是获取connection的session在stopQueryTimer中去执行getCancelTimer()时因为session为null报的异常，好奇什么情况下connection的session会为null导致这个异常，求解答，谢谢！！