Jackson-databind: How to convert JsonNode to ObjectNode

[ekko100120]

I want to partly modify some field value in a json file without entity class , so i have to use JsonNode to convert to ObjectNode.
but when i attempt to do this way, it throw a exception:Caused by: java.lang.ClassCastException: com.fasterxml.jackson.databind.node.TextNode cannot be cast to com.fasterxml.jackson.databind.node.ObjectNode

so how can i resolve this problem,or is there any other method to partly update json file without entity class

[cowtowncoder]

Great question to ask on a proper forum, like

https://groups.google.com/forum/#!forum/jackson-user

or

https://gitter.im/FasterXML/jackson-databind