flink1.10.1??idea????dml????????Error during disposal of stream operator. java.lang.NullPointerException

Wed, 23 Dec 2020 03:46:38 -0800 

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2020-12-23 19:43:01,588 ERROR 
org.apache.flink.streaming.runtime.tasks.StreamTask        
   - Error during disposal of stream operator.
java.lang.NullPointerException
        at 
org.apache.flink.api.java.io.jdbc.JDBCUpsertOutputFormat.close(JDBCUpsertOutputFormat.java:202)
        at 
org.apache.flink.api.java.io.jdbc.JDBCUpsertSinkFunction.close(JDBCUpsertSinkFunction.java:61)
        at 
org.apache.flink.api.common.functions.util.FunctionUtils.closeFunction(FunctionUtils.java:43)
        at 
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.dispose(AbstractUdfStreamOperator.java:117)
        at 
org.apache.flink.streaming.runtime.tasks.StreamTask.disposeAllOperators(StreamTask.java:651)
        at 
org.apache.flink.streaming.runtime.tasks.StreamTask.cleanUpInvoke(StreamTask.java:562)
        at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:480)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:708)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:533)
        at java.lang.Thread.run(Thread.java:748)

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