kyoty opened a new issue #5850:
URL: https://github.com/apache/dolphinscheduler/issues/5850
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**Describe the bug**
A clear and concise description of what the bug is.
**To Reproduce**
Steps to reproduce the behavior, for example:
1. create a process definition
2. create a mysql query task
3. export the process definition, we would get a empty json, and the log
shows below:
```java
[ERROR] 2021-07-20 00:12:26.280
org.apache.dolphinscheduler.api.controller.ProcessDefinitionController:[640] -
batch export process definition by ids error
java.lang.ClassCastException: com.fasterxml.jackson.databind.node.POJONode
cannot be cast to com.fasterxml.jackson.databind.node.ObjectNode
at
org.apache.dolphinscheduler.api.utils.exportprocess.DataSourceParam.addExportSpecialParam(DataSourceParam.java:51)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl.addExportTaskNodeSpecialParam(ProcessDefinitionServiceImpl.java:728)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl.exportProcessMetaData(ProcessDefinitionServiceImpl.java:686)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl.getProcessDefinitionList(ProcessDefinitionServiceImpl.java:639)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl.batchExportProcessDefinitionByIds(ProcessDefinitionServiceImpl.java:621)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl$$FastClassBySpringCGLIB$$e8e34ed9.invoke(<generated>)
at
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:687)
at
org.apache.dolphinscheduler.api.service.impl.ProcessDefinitionServiceImpl$$EnhancerBySpringCGLIB$$f87458f2.batchExportProcessDefinitionByIds(<generated>)
at
org.apache.dolphinscheduler.api.controller.ProcessDefinitionController.batchExportProcessDefinitionByIds(ProcessDefinitionController.java:638)
at
org.apache.dolphinscheduler.api.controller.ProcessDefinitionController$$FastClassBySpringCGLIB$$dc9bf5db.invoke(<generated>)
at
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:752)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at
org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at
org.apache.dolphinscheduler.api.aspect.AccessLogAspect.doAround(AccessLogAspect.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
```
**Which version of Dolphin Scheduler:**
latest dev branch
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