dailidong opened a new issue #4191:
URL: https://github.com/apache/incubator-dolphinscheduler/issues/4191
**Describe the bug**
when run a Process Definition， An exception throws in worker server runtime
log, as follow:
[ERROR] 2020-12-09 17:38:14.996
org.apache.dolphinscheduler.common.utils.JSONUtils:[126] - parse object
exception!
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot
construct instance of
`org.apache.dolphinscheduler.remote.command.DBTaskResponseCommand` (no
Creators, like default construct, exist): cannot deserialize from Object value
(no delegate- or property-based Creator)
at [Source: (String)"{"taskInstanceId":15,"status":7}"; line: 1, column: 2]
at
com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
at
com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1452)
at
com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1028)
at
com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1297)
at
com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326)
at
com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
at
com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
at
com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)
at
org.apache.dolphinscheduler.common.utils.JSONUtils.parseObject(JSONUtils.java:124)
at
org.apache.dolphinscheduler.common.utils.JSONUtils.parseObject(JSONUtils.java:144)
at
org.apache.dolphinscheduler.server.worker.processor.DBTaskResponseProcessor.process(DBTaskResponseProcessor.java:45)
at
org.apache.dolphinscheduler.remote.handler.NettyServerHandler$1.run(NettyServerHandler.java:128)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
**Which version of Dolphin Scheduler:**
-[Dev]
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