How do I disable fail_on_empty_beans in Jackson?
Using jackson 2.1, how do I disable the fail_on_empty beans that the error message seems to want me to disable?
I'm assuming this is just the simplest thing in the world, but hell it is late and I haven't been able to find a simple tutorial or anything particularly obvious from the api. SerializationFactory? Why would they make it so unintuitive and then make the error message seem so straightforward?
Although I do like the error message, I mean, it is better than an NPE.
I'm assuming there is a way to do this using annotations - but I'm not keen on using them at all for the simplistic work I'm doing!
Solution 1:
You can do this per class or globally, I believe.
For per class, try @JsonSerialize above class declaration.
For a mapper, here's one example:
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
// do various things, perhaps:
String someJsonString = mapper.writeValueAsString(someClassInstance);
SomeClass someClassInstance = mapper.readValue(someJsonString, SomeClass.class)
The StackOverflow link below also has an example for a Spring project.
For REST with Jersey, I don't remember off the top off my head, but I believe it's similar.
Couple of links I dug up: (edited 1st link due to Codehaus shutting down).
- https://web.archive.org/web/20150513164332/https://jira.codehaus.org/browse/JACKSON-201
- Jackson serializationConfig
Solution 2:
If you are using Spring Boot, you can set the following property in application.properties file.
spring.jackson.serialization.FAIL_ON_EMPTY_BEANS=false