njnu-seafish opened a new issue, #17528: URL: https://github.com/apache/dolphinscheduler/issues/17528
### Search before asking - [x] I had searched in the [issues](https://github.com/apache/dolphinscheduler/issues?q=is%3Aissue) and found no similar issues. ### What happened For certain workflow instances, an exception occurs during the modify and save operation: > 2025-09-18 16:43:32.651 ERROR [qtp1813608092-24591] o.a.d.a.e.ApiExceptionHandler:[47] - Meet an unknown exception: java.lang.IllegalArgumentException: Parse json: {"commandType":"START_PROCESS","subWorkflowInstance":false,"startNodes":[18783478428422],"commandParams":[],"timeZone":"GMT+08:00"} to type: java.util.Map<java.lang.String, java.lang.String> failed at org.apache.dolphinscheduler.common.utils.JSONUtils.parseObject(JSONUtils.java:295) at org.apache.dolphinscheduler.common.utils.JSONUtils.toMap(JSONUtils.java:251) at org.apache.dolphinscheduler.api.service.impl.WorkflowInstanceServiceImpl.updateWorkflowInstance(WorkflowInstanceServiceImpl.java:667) at org.apache.dolphinscheduler.api.service.impl.WorkflowInstanceServiceImpl$$FastClassBySpringCGLIB$$4b33d4bb.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:792) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:762) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:707) at org.apache.dolphinscheduler.api.service.impl.WorkflowInstanceServiceImpl$$EnhancerBySpringCGLIB$$ad4afa8d.updateWorkflowInstance(<generated>) at org.apache.dolphinscheduler.api.controller.WorkflowInstanceController.updateWorkflowInstance(WorkflowInstanceController.java:190) ...... ...... Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.lang.String` from Array value (token `JsonToken.START_ARRAY`) at [Source: (String)"{"commandType":"START_PROCESS","subWorkflowInstance":false,"startNodes":[18783478428422],"commandParams":[],"timeZone":"GMT+08:00"}"; line: 1, column: 74] (through reference chain: java.util.LinkedHashMap["startNodes"]) at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1752) at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1526) at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromArray(StdDeserializer.java:222) at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:46) at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11) at com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringKeyMap(MapDeserializer.java:623) at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:449) at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:32) at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:323) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4825) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3772) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3755) at org.apache.dolphinscheduler.common.utils.JSONUtils.parseObject(JSONUtils.java:293) ### What you expected to happen Can successfully trigger the workflow instance save operation. ### How to reproduce 1, Enter the workflow instance menu <img width="1277" height="475" alt="Image" src="https://github.com/user-attachments/assets/2c3eab85-2ee3-4b7e-a8b1-0711e6e14c03"; /> 2, Click the edit button <img width="1263" height="383" alt="Image" src="https://github.com/user-attachments/assets/6b49c1d2-0ef4-40fb-9410-27f3a005725f"; /> 3, Click the save button <img width="1107" height="482" alt="Image" src="https://github.com/user-attachments/assets/9c7e78fa-ee84-4ffc-9e81-4dde5b72764c"; /> ### Anything else I have a bit of a question: a workflow instance should be a snapshot of a running workflow, so why can it be modified? ### Version dev ### Are you willing to submit PR? - [x] Yes I am willing to submit a PR! ### Code of Conduct - [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. 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