From 99eb4e4f23721a2dc9c5d3d14ca59b2053eb5c25 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C5=A0pan=C4=9Bl?=
 <OndrejSpanel@users.noreply.github.com>
Date: Mon, 30 Jul 2018 14:01:06 +0200
Subject: [PATCH] Demonstrate the problem
 (https://github.com/FasterXML/jackson-module-scala/issues/366)

---
 .gitignore                          |  4 +++
 build.sbt                           | 14 +++++++++
 project/build.properties            |  1 +
 src/main/scala/mypackage/Main.scala | 49 +++++++++++++++++++++++++++++
 4 files changed, 68 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 build.sbt
 create mode 100644 project/build.properties
 create mode 100644 src/main/scala/mypackage/Main.scala

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a9f72d8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/.idea
+/target
+/project/target
+
diff --git a/build.sbt b/build.sbt
new file mode 100644
index 0000000..d6f25a3
--- /dev/null
+++ b/build.sbt
@@ -0,0 +1,14 @@
+name := "JacksonTypeAlias"
+
+version := "0.1"
+
+scalaVersion := "2.11.12"
+
+
+val jacksonVersion = "2.9.6"
+
+libraryDependencies += "com.fasterxml.jackson.core" % "jackson-databind" % jacksonVersion
+
+libraryDependencies += "com.fasterxml.jackson.module" %% "jackson-module-scala" % jacksonVersion
+
+libraryDependencies += "com.fasterxml.jackson.dataformat" % "jackson-dataformat-yaml" % jacksonVersion
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 0000000..16eecf5
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version = 1.1.6
\ No newline at end of file
diff --git a/src/main/scala/mypackage/Main.scala b/src/main/scala/mypackage/Main.scala
new file mode 100644
index 0000000..2b48638
--- /dev/null
+++ b/src/main/scala/mypackage/Main.scala
@@ -0,0 +1,49 @@
+package mypackage
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.scala.DefaultScalaModule
+import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper
+
+case class XY(x: Double = 0, y: Double = 0)
+
+trait Abstract {
+  type Vector2f
+
+  trait ConstructVector2f {
+    def apply(x: Double, y: Double): Vector2f
+  }
+  implicit val Vector2f: ConstructVector2f
+}
+
+object Concrete extends Abstract {
+  type Vector2f = XY
+  object Vector2f extends ConstructVector2f {
+    def apply(x: Double, y: Double) = XY(x, y)
+  }
+}
+
+object Abstract {
+  val Link: Abstract = Concrete
+}
+
+import Abstract.Link.Vector2f
+
+case class Container(from: Vector2f)
+
+object Main extends App {
+
+  val mapper = new ObjectMapper with ScalaObjectMapper
+
+  mapper.registerModule(DefaultScalaModule)
+
+  val input = Container(Vector2f(0,0))
+
+  val out = mapper.writeValueAsString(input)
+
+  val loaded = mapper.readValue[Container](out)
+
+  val xy: Vector2f = loaded.from
+
+  println(loaded) // prints "Container(Map(x -> 0.0, y -> 0.0))" instead of "Container(XY(0.0,0.0))"
+  assert(xy.isInstanceOf[XY]) // fails
+}
\ No newline at end of file