Unsupported value type '*Json'*

[aravindhrs]

The value field must contain an escaped String of the serialized variable value (XML or JSON depending on the serializationDataFormat field).

valueInfo A JSON object containing additional, value-type-dependent properties.

For serialized variables of type Object , the following properties can be provided:

• objectTypeName : A string representation of the object’s type name.
• serializationDataFormat : The serialization format used to store the variable.

How to persist Custom Java Object in Process engine?

Here is an example: https://docs.camunda.org/manual/7.9/reference/rest/process-instance/variables/put-variable/#request-1 The value field must contain an escaped String of the serialized variable value (XML or JSON depending on the serializationDataFormat field).