Jackson Scala 3 support that uses scala3-reflection to get type info based on Scala 3 Tasty files (or at compile time, see Performance section).
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.
See jackson-scala-reflect-extensions for the Scala 2 equivalent.
This lib is designed to used with jackson-module-scala. By default, jackson-module-scala uses Java reflection to work out the class structure.
ScalaReflectionExtensions can be mixed into your ObjectMapper in as a similar way to jackson-module-scala's ClassTagExtensions and ScalaObjectMapper.
libraryDependencies += "com.github.pjfanning" %% "jackson-scala3-reflection-extensions" % "2.16.0"
import com.fasterxml.jackson.databind.json.JsonMapper import com.fasterxml.jackson.module.scala.DefaultScalaModule import com.github.pjfanning.jackson.reflection.ScalaReflectionExtensions val mapperBuilder = JsonMapper.builder() .addModule(DefaultScalaModule) val mapper = mapperBuilder.build() :: ScalaReflectionExtensions // this should also work but Jackson is moving to supporting only creating mapper instances from a builder val mapper2 = new ObjectMapper with ScalaReflectionExtensions mapper2.registerModule(DefaultScalaModule) val instance = mapper.readValue[MyClass](jsonText)
The code to calculate the class details can be slow, as detailed in gzoller/scala-reflection. The results are cached, so they won't be recalculated every time you call readValue.
If performance worries you then you should consider enabling the compiler plugin.
addCompilerPlugin("com.github.pjfanning" %% "scala3-reflection")
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