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java.lang.NullPointerException: 	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.loadBinlogChecksum(MysqlConnection.java:284)	at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.dump(MysqlConnection.java:113)	at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:209)	at java.lang.Thread.run(Unknown Source)