java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

[水静于止]

java.io.IOException: unable to open JDBC writer
    at org.apache.flink.connector.jdbc.internal.AbstractJdbcOutputFormat.open(AbstractJdbcOutputFormat.java:61)
    at org.apache.flink.connector.jdbc.internal.JdbcBatchingOutputFormat.open(JdbcBatchingOutputFormat.java:112)
    at org.apache.flink.streaming.api.functions.sink.OutputFormatSinkFunction.open(OutputFormatSinkFunction.java:65)
    at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
    at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102)
    at org.apache.flink.table.runtime.operators.sink.SinkOperator.open(SinkOperator.java:73)
    at org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:291)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:473)
    at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:469)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:522)
    at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider.getConnection(SimpleJdbcConnectionProvider.java:52)
    at org.apache.flink.connector.jdbc.internal.AbstractJdbcOutputFormat.establishConnection(AbstractJdbcOutputFormat.java:66)
    at org.apache.flink.connector.jdbc.internal.AbstractJdbcOutputFormat.open(AbstractJdbcOutputFormat.java:59)
    ... 13 more


任务jar 包 已经把 mysql jdbc驱动 打进来了，可是一直报 找不到驱动。flinkSQL job， 用实现sink 方式 是正常的。