Should I declare Jackson’s ObjectMapper as a static field?

by

Yes, that is safe and recommended.

The only caveat from the page you referred is that you can’t be modifying configuration of the mapper once it is shared; but you are not changing configuration so that is fine. If you did need to change configuration, you would do that from the static block and it would be fine as well.

EDIT: (2013/10)

With 2.0 and above, above can be augmented by noting that there is an even better way: use ObjectWriter and ObjectReader objects, which can be constructed by ObjectMapper.
They are fully immutable, thread-safe, meaning that it is not even theoretically possible to cause thread-safety issues (which can occur with ObjectMapper if code tries to re-configure instance).

More Related Contents:

  1. Ignoring new fields on JSON objects using Jackson [duplicate]
  2. Only using @JsonIgnore during serialization, but not deserialization
  3. How can I include raw JSON in an object using Jackson?
  4. Jackson Vs. Gson [closed]
  5. Jackson and generic type reference
  6. Serializing with Jackson (JSON) – getting “No serializer found”?
  7. org.codehaus.jackson versus com.fasterxml.jackson.core
  8. directly convert CSV file to JSON file using the Jackson library
  9. How can I tell jackson to ignore a property for which I don’t have control over the source code?
  10. Why I’m not able to unwrap and serialize a Java map using the Jackson Java library?
  11. Java: Jackson polymorphic JSON deserialization of an object with an interface property?
  12. Jackson dynamic property names
  13. JSON consumer of polymorphic objects
  14. How to serialize only the ID of a child with Jackson
  15. Issue with parsing the content from JSON file with Jackson & message- JsonMappingException -Cannot deserialize as out of START_ARRAY token
  16. Jackson JSON library: how to instantiate a class that contains abstract fields
  17. Jackson deserialization with unknown dynamic properties
  18. Jackson – deserialize inner list of objects to list of one higher level
  19. Merging Two JSON Documents Using Jackson
  20. Use class name as root key for JSON Jackson serialization
  21. How to deserialize a blank JSON string value to null for java.lang.String?
  22. Jackson list deserialization. nested Lists
  23. Custom Jackson Serializer for a specific type in a particular class
  24. Jackson – Deserialize Generic class variable
  25. Make Jackson use a custom deserializer everywhere (for a type which isn’t mine)
  26. Jackson custom annotation for custom value serialization
  27. Spring-MVC 406 Not Acceptable instead of JSON Response
  28. Jackson throws JsonMappingException on deserialize; demands single-String constructor?
  29. Convert JsonNode into POJO
  30. How to rename root key in JSON serialization with Jackson

Leave a Comment