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Jackson Scala 2 support that uses scala-reflect
to get type info. The problem that this lib solves in described in this FAQ entry.
The lib can also auto-discover subtypes if you are using Jackson's polymorphism support (@JsonTypeInfo annotation). You can omit the @JsonSubTypes if you dealing with sealed traits.
This lib is designed to be used with jackson-module-scala. By default,
jackson-module-scala uses Java reflection to work out the class structure.
importcom.fasterxml.jackson.databind.json.JsonMapperimportcom.fasterxml.jackson.module.scala.DefaultScalaModuleimportcom.github.pjfanning.jackson.reflect.ScalaReflectExtensionsvalmapperBuilder=JsonMapper.builder()
.addModule(DefaultScalaModule)
valmapper= mapperBuilder.build() ::ScalaReflectExtensions// this should also work but Jackson is moving to supporting only creating mapper instances from a buildervalmapper2=newObjectMapperwithScalaReflectExtensions
mapper2.registerModule(DefaultScalaModule)
valinstance= mapper.readValue[MyClass](jsonText)
If you want the sealed trait support, you will need to register the ScalaReflectAnnotationIntrospectorModule module.
importcom.fasterxml.jackson.databind.json.JsonMapperimportcom.fasterxml.jackson.module.scala.DefaultScalaModuleimportcom.github.pjfanning.jackson.reflect.ScalaReflectAnnotationIntrospectorModulevalmapperBuilder=JsonMapper.builder()
.addModule(DefaultScalaModule)
.addModule(ScalaReflectAnnotationIntrospectorModule)
valmapper= mapperBuilder.build()
// this should also work but Jackson is moving to supporting only creating mapper instances from a buildervalmapper2=newObjectMapper
mapper2.registerModule(DefaultScalaModule)
mapper2.registerModule(ScalaReflectAnnotationIntrospectorModule)
About
Extension to jackson-module-scala that uses scala-reflect to get type info
