Object not serializing ok (#496)

Author: pjfanning

src/main/scala/com/fasterxml/jackson/module/scala/introspect/BeanIntrospector.scala

@@ -187,10 +187,11 @@ object BeanIntrospector {
     //create properties for all appropriate fields
     val fields = for {
       cls <- hierarchy
+      classW = ClassW(cls)
       field <- cls.getDeclaredFields
       name = maybePrivateName(field)
       if !name.contains('$')
-      if (isScalaCaseObject(cls) || isAcceptableField(field))
+      if (classW.isScalaObject || isScalaCaseObject(cls) || isAcceptableField(field))
       beanGetter = findBeanGetter(cls, name)
       beanSetter = findBeanSetter(cls, name)
     } yield PropertyDescriptor(name, findConstructorParam(hierarchy.head, name), Some(field), findGetter(cls, name), findSetter(cls, name), beanGetter, beanSetter)

src/main/scala/com/fasterxml/jackson/module/scala/introspect/ScalaAnnotationIntrospectorModule.scala

@@ -17,7 +17,7 @@ object ScalaAnnotationIntrospector extends NopAnnotationIntrospector with ValueI
   private [this] val _descriptorCache = new LRUMap[ClassKey, BeanDescriptor](16, 100)
 
   private def _descriptorFor(clz: Class[_]): Option[BeanDescriptor] = {
-    if (clz.hasSignature || clz.extendsScalaClass) {
+    if (clz.extendsScalaClass || clz.hasSignature) {
       val key = new ClassKey(clz)
       Option(_descriptorCache.get(key)) match {
         case Some(result) => Some(result)

src/main/scala/com/fasterxml/jackson/module/scala/util/Classes.scala

@@ -2,11 +2,12 @@ package com.fasterxml.jackson.module.scala.util
 
 import scala.language.implicitConversions
 import scala.reflect.{ScalaLongSignature, ScalaSignature}
+import scala.util.Try
 
 trait ClassW extends PimpedType[Class[_]] {
 
   def extendsScalaClass: Boolean = {
-    ClassW.productClass.isAssignableFrom(value)
+    ClassW.productClass.isAssignableFrom(value) || isScalaObject
   }
 
   def hasSignature: Boolean = {
@@ -19,6 +20,10 @@ trait ClassW extends PimpedType[Class[_]] {
     }
     hasSigHelper(value)
   }
+
+  def isScalaObject: Boolean = {
+    Try(value.getField("MODULE$")).isSuccess
+  }
 }
 
 object ClassW {

src/test/scala/com/fasterxml/jackson/module/scala/ser/ObjectSerializerTest.scala

@@ -16,7 +16,7 @@ class ObjectSerializerTest extends SerializerTest {
   import ObjectSerializerTest._
   def module = DefaultScalaModule
 
-  "An ObjectMapper with the DefaultScalaModule" should "serialize an object as a bean" ignore {
+  "An ObjectMapper with the DefaultScalaModule" should "serialize an object as a bean" in {
     serialize(ObjectWithoutJsonProperty) should (
        equal ("""{"name":"name1","value":"value1"}""") or
        equal ("""{"value":"value1","name":"name1"}""")