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    <p>Here's one solution with <a href="https://github.com/lift/lift/tree/master/framework/lift-base/lift-json" rel="nofollow">Lift JSON</a>.</p> <pre><code>import java.util.UUID import net.liftweb.json._ import net.liftweb.json.JsonAST._ import net.liftweb.json.JsonDSL._ import net.liftweb.json.Serialization._ sealed abstract class Parent { def uuid: UUID } case class Foo(uuid: UUID, name: String) extends Parent object UUIDTest extends Application { implicit val formats = Serialization.formats(NoTypeHints) + new UUIDSerializer val f = Foo(UUID.randomUUID, "foo") val ser = write(f) println(ser) val f2 = read[Foo](ser) assert(f == f2) // Special serializer for UUID type class UUIDSerializer extends Serializer[UUID] { private val Class = classOf[UUID] def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), UUID] = { case (TypeInfo(Class, _), json) =&gt; json match { case JObject(JField("mostSig", JInt(m)) :: JField("leastSig", JInt(l)) :: Nil) =&gt; new UUID(m.longValue, l.longValue) case x =&gt; throw new MappingException("Can't convert " + x + " to UUID") } } def serialize(implicit format: Formats): PartialFunction[Any, JValue] = { case x: UUID =&gt; ("mostSig" -&gt; x.getMostSignificantBits) ~ ("leastSig" -&gt; x.getLeastSignificantBits) } } } </code></pre> <p>It prints:</p> <pre><code>{"uuid":{"mostSig":-8054689529719995935,"leastSig":-5722404370736228056},"name":"foo"}' </code></pre> <p>Another solution which uses a custom serializer for Parent type.</p> <pre><code>sealed abstract class Parent { var uuid: UUID = UUID.randomUUID } case class Foo(name: String) extends Parent object UUIDTest extends Application { implicit val formats = Serialization.formats(NoTypeHints) + new ParentSerializer val f = Foo("foo") val ser = write(f) println(ser) val f2 = read[Foo](ser) assert(f == f2) // Special serializer for Parent type class ParentSerializer extends Serializer[Parent] { def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), Parent] = { case (t@TypeInfo(cl, _), json) if (classOf[Parent].isAssignableFrom(cl)) =&gt; val x = Extraction.extract(json, t)(DefaultFormats).asInstanceOf[Parent] x.uuid = (for { JField("mostSig", JInt(m)) &lt;- json JField("leastSig", JInt(l)) &lt;- json } yield new UUID(m.longValue, l.longValue)).head x } def serialize(implicit format: Formats): PartialFunction[Any, JValue] = { case x: Parent =&gt; Extraction.decompose(x)(DefaultFormats) ++ JField("mostSig", x.uuid.getMostSignificantBits) ++ JField("leastSig", x.uuid.getLeastSignificantBits) } } } </code></pre>
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    1. POWhich JSON serialization library would fit to the following case?
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    1. USJoni
    1. USJoni
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    1. POWhich JSON serialization library would fit to the following case?
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    1. COYour code doesn't exactly resemble my case. uuid in class Parent should be var and uuid should be missing from class Foo (case class Foo(name:String) extends Parent). Will lift-json work then?
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      1. USWojciech Durczyński
    2. CONo :( Lift JSON serialization works only on case class constructor parameters. Internal fields are not serialized.
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    3. COWojciech, I added another solution which might work for you. It adds a custom serializer for Parent types.
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