diff --git a/src/Factory/Reflection/ReflectionMethodFactory.php b/src/Factory/Reflection/ReflectionMethodFactory.php
index 403e86c..0f845a1 100644
--- a/src/Factory/Reflection/ReflectionMethodFactory.php
+++ b/src/Factory/Reflection/ReflectionMethodFactory.php
@@ -152,7 +152,11 @@ protected function addParamAnnotation($name, $value) : void
 
         if (!$this->parameters->containsKey($param))
         {
-            throw new \Exception();
+            throw new \Exception
+            (
+                  'Tried to set param annotation for non existant '
+                . 'parameter: ' . $param
+            );
         }
 
         $comparator = new TypeComparator();
@@ -162,7 +166,7 @@ protected function addParamAnnotation($name, $value) : void
 
         if (!$comparator->compatible($nativeType, $type))
         {
-            throw new \Exception();
+            throw new \Exception('Types are incompatible');
         }
 
         $param->setRawValue('type', $type);
@@ -182,7 +186,7 @@ protected function addParameter
     {
         $parameter = new ReflectionParameter();
         $accessor = new RawPropertyAccessor($parameter);
-        $type = $this->typeParser->parse((string)$reflect->getType());
+        $type = (new TypeParser())->parse((string)$reflect->getType());
 
         $this->parameters['$' . $reflect->getName()] = $accessor;
         $this->accessor->rawAddToValue('parameters', $parameter);
diff --git a/src/Service/PropertyAccessor.php b/src/Service/PropertyAccessor.php
index a637f64..813b632 100644
--- a/src/Service/PropertyAccessor.php
+++ b/src/Service/PropertyAccessor.php
@@ -112,14 +112,14 @@ public function constructObject(...$args)
      */
     protected function buildProperty(ReflectionProperty $property)
     {
-        if ($property->type instanceof ObjectType)
+        if (!$property->type instanceof ObjectType)
         {
-            $class = $property->type->classname;
-            $this->setRawValue($property->name, new $class());
+            $this->setAnyValue($property, 0);
         }
-        else
+        elseif ($property->builtInConstructor)
         {
-            $this->setAnyValue($property, 0);
+            $class = $property->type->classname;
+            $this->setRawValue($property->name, new $class());
         }
     }