canal连接mysql5.5报错
canal.1.1.4 启动时报错（数据库为mysql5.5) 。错误信息如下：
2019-08-12 15:21:28.610 [destination = example , address = /127.0.0.1:3306 , EventParser] ERROR c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - dump address /127.0.0.1:3306 has an error, retrying. caused by com.alibaba.otter.canal.parse.exception.CanalParseException: java.io.IOException: connect /127.0.0.1:3306 failure Caused by: java.io.IOException: connect /127.0.0.1:3306 failure at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:83) ~[canal.parse.driver-1.1.4-SNAPSHOT.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection.connect(MysqlConnection.java:89) ~[canal.parse-1.1.4-SNAPSHOT.jar:na] at com.alibaba.otter.canal.parse.inbound.mysql.MysqlEventParser.preDump(MysqlEventParser.java:86) ~[canal.parse-1.1.4-SNAPSHOT.jar:na] at com.alibaba.otter.canal.parse.inbound.AbstractEventParser$3.run(AbstractEventParser.java:175) ~[canal.parse-1.1.4-SNAPSHOT.jar:na] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66] Caused by: java.lang.NullPointerException: null at java.io.OutputStream.write(OutputStream.java:75) ~[na:1.8.0_66] at com.alibaba.otter.canal.parse.driver.mysql.packets.client.AuthSwitchResponsePacket.toBytes(AuthSwitchResponsePacket.java:17) ~[canal.parse.driver-1.1.4-SNAPSHOT.jar:na] at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.negotiate(MysqlConnector.java:241) ~[canal.parse.driver-1.1.4-SNAPSHOT.jar:na] at com.alibaba.otter.canal.parse.driver.mysql.MysqlConnector.connect(MysqlConnector.java:80) ~[canal.parse.driver-1.1.4-SNAPSHOT.jar:na] ... 4 common frames omitted
补充一下： instance.properties 文件中的mysql用户名和密码， 在mysql client 实测可正常连接数据库。
原提问者GitHub用户jorchen
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