json - Small Example of Jackson Scala Module?

Question

Can anyone point me towards a simple example of Jackson serialization/deserialization with their Scala module for 2.10? I'm looking for reflection-based JSON not requiring field-by-field annotation or assignment and it seemed this could do that, but their documentation includes no examples.

If I have a case class:

case class Person(name:String, age:Int)
val person = Person("Fred", 65)

So from their github readme:

val mapper = new ObjectMapper()
mapper.registerModule(DefaultScalaModule)

OK, now what...? How to I convert p to/from JSON?

Answer 1

Give this a shot:

val person = Person("fred", 25)
val mapper = new ObjectMapper()
mapper.registerModule(DefaultScalaModule)    

val out = new StringWriter
mapper.writeValue(out, person)
val json = out.toString()
println(json)

val person2 = mapper.readValue(json, classOf[Person])
println(person2)

EDIT

Just be sure to declare the Person class as top level as it will not work otherwise.