Mule: JSON to Object
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The document discusses how Mule supports JSON data handling, including binding JSON to Java objects using the Jackson framework. It explains the use of JSON transformers in Mule Studio and how to handle unrecognized fields in JSON data. Additionally, the document provides examples and solutions for adapting to changes in JSON structure while ensuring successful data transformation.
![JSON TO OBJECT: DEMO - XML CONFIG
âą Two-way editing between graphical and XML views.
<flow name="jsonToObjectFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/"
doc:name="HTTP"/>
<json:json-to-object-transformer
returnClass="com.mulesoft.learning.Person" doc:name="JSON to Object"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
</flow>](https://image.slidesharecdn.com/mule-jsontoobject-160929051038/85/Mule-JSON-to-Object-6-320.jpg)
Mule: JSON to Object
- 1. MULE: JSON TO OBJECT HANDLING UNRECOGNIZED FIELD
- 2. JSON SUPPORT REFERENCE âą JSON, short for JavaScript Object Notation, is a lightweight data interchange format. âą Mule supports binding JSON data to objects and marshalling Java object to JSON using the Jackson Framework. âą JSON transformers have been added in Studio to make it easy to work with JSON encoded messages.
- 3. JSON BINDINGS (1/2) âą Jackson uses annotations to describe how data is mapped to a Java object model. âą For example an JSON file that describes a person: { "id": 1, "name": "Max" }
- 4. JSON BINDINGS (2/2) âą @JsonAutoDetect maps directly the field member names to JSON field names. package com.mulesoft.learning; import org.codehaus.jackson.annotate.JsonAutoDetect; @JsonAutoDetect public class Person { private String id; private String name; //getter-setter }
- 5. JSON TO OBJECT: DEMO - DESIGN âą HTTP: an inbound endpoint for posting the JSON data. âą JSON to Object: transforming the JSON data to a Java object. âą Logger: displaying the log.
- 6. JSON TO OBJECT: DEMO - XML CONFIG âą Two-way editing between graphical and XML views. <flow name="jsonToObjectFlow"> <http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/> <json:json-to-object-transformer returnClass="com.mulesoft.learning.Person" doc:name="JSON to Object"/> <logger message="#[payload]" level="INFO" doc:name="Logger"/> </flow>
- 7. JSON TO OBJECT: TESTING (1/2) âą Use a REST Client, e.g.: Postman, for posting the JSON data.
- 8. JSON TO OBJECT: TESTING (2/2) âą Posting the JSON data with an unrecognized field: Failed!
- 9. JSON TO OBJECT: ISSUE âą JSON to Object Transformer failed to transform an JSON data with unrecognized field. âą Root Exception stack trace: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "type" (Class com.mulesoft.learning.Person), not marked as ignorable. âą How to easily adapt to change if this issue happens?
- 10. JSON TO OBJECT: SOLUTION âą Ignore unrecognized field. package com.mulesoft.learning; import org.codehaus.jackson.annotate.JsonAutoDetect; import org.codehaus.jackson.annotate.JsonIgnoreProperties; @JsonAutoDetect @JsonIgnoreProperties(ignoreUnknown=true) public class Person { private String id; private String name; //getter-setter }
- 11. JSON TO OBJECT: FINAL TESTING âą Posting the JSON data with an unrecognized field: Success!
- 12. SUMMARY âą JSON is natively supported in Mule. âą JSON data can be bind automatically to Java object. âą Unrecognized field can be handled by Jackson Framework.