Canal使用異常記錄

一、protobuf-java版本過低

Exception in thread "Canal Receiver" java.lang.IllegalAccessError: tried to access field com.google.protobuf.AbstractMessage.memoizedSize from class com.alibaba.otter.canal.protocol.CanalPacket$ClientAuth
	at com.alibaba.otter.canal.protocol.CanalPacket$ClientAuth.getSerializedSize(CanalPacket.java:3274)
	at com.google.protobuf.AbstractMessageLite.toByteString(AbstractMessageLite.java:49)
	at com.alibaba.otter.canal.client.impl.SimpleCanalConnector.doConnect(SimpleCanalConnector.java:171)
	at com.alibaba.otter.canal.client.impl.SimpleCanalConnector.connect(SimpleCanalConnector.java:113)
	at cn.touna.scala.spark.streaming.CanalReceiver.cn$touna$scala$spark$streaming$CanalReceiver$$receive(CanalReceiver.scala:101)
	at cn.touna.scala.spark.streaming.CanalReceiver$$anon$1.run(CanalReceiver.scala:88)

解決：
1.引入高版本依賴

<dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.5.1</version>
        </dependency>

2.使用IED或者mvn dependency:tree -Dverbose 查看是否有版本衝突，排除低版本
3.如果1,2還不能解決，可能是某些依賴是個shade包，已經將protobuf-java低版本打入包中，debug查看即可，我項目中是hive-exec將低版本打包了，只有去除該依賴才能解決