diff --git a/composer.json b/composer.json
index 1c154df..b82274d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,8 @@
     "require": {
         "php": "^7.1 || ^8.0",
         "netresearch/jsonmapper": "^1.0 || ^2.0",
-        "phpdocumentor/reflection-docblock": "^4.3.4 || ^5.0.0"
+        "phpdocumentor/reflection": "^4.0"
+
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0 || ^8.0"
diff --git a/lib/Dispatcher.php b/lib/Dispatcher.php
index 5f045df..cc73367 100644
--- a/lib/Dispatcher.php
+++ b/lib/Dispatcher.php
@@ -3,13 +3,9 @@
 
 namespace AdvancedJsonRpc;
 
+use AdvancedJsonRpc\Reflection;
 use JsonMapper;
 use JsonMapper_Exception;
-use phpDocumentor\Reflection\DocBlockFactory;
-use phpDocumentor\Reflection\Types;
-use ReflectionException;
-use ReflectionMethod;
-use ReflectionNamedType;
 
 class Dispatcher
 {
@@ -24,21 +20,14 @@ class Dispatcher
     private $delimiter;
 
     /**
-     * method => ReflectionMethod[]
-     *
-     * @var ReflectionMethod
-     */
-    private $methods;
-
-    /**
-     * @var \phpDocumentor\Reflection\DocBlockFactory
+     * @var Reflection\ReflectionInterface
      */
-    private $docBlockFactory;
+    private $reflection;
 
     /**
-     * @var \phpDocumentor\Reflection\Types\ContextFactory
+     * @var JsonMapper
      */
-    private $contextFactory;
+    private $mapper;
 
     /**
      * @param object $target    The target object that should receive the method calls
@@ -48,9 +37,8 @@ public function __construct($target, $delimiter = '->')
     {
         $this->target = $target;
         $this->delimiter = $delimiter;
-        $this->docBlockFactory = DocBlockFactory::createInstance();
-        $this->contextFactory = new Types\ContextFactory();
         $this->mapper = new JsonMapper();
+        $this->reflection = new Reflection\NativeReflection();
     }
 
     /**
@@ -81,33 +69,19 @@ public function dispatch($msg)
             }
             $obj = $obj->$part;
         }
-        if (!isset($this->methods[$msg->method])) {
-            try {
-                $method = new ReflectionMethod($obj, $fn);
-                $this->methods[$msg->method] = $method;
-            } catch (ReflectionException $e) {
-                throw new Error($e->getMessage(), ErrorCode::METHOD_NOT_FOUND, null, $e);
-            }
-        }
-        $method = $this->methods[$msg->method];
-        $parameters = $method->getParameters();
-        if ($method->getDocComment()) {
-            $docBlock = $this->docBlockFactory->create(
-                $method->getDocComment(),
-                $this->contextFactory->createFromReflector($method->getDeclaringClass())
-            );
-            $paramTags = $docBlock->getTagsByName('param');
-        }
+
+        $method = $this->reflection->getMethodDetails($msg->method, $obj, $fn);
+
         $args = [];
         if (isset($msg->params)) {
             // Find out the position
             if (is_array($msg->params)) {
                 $args = $msg->params;
             } else if (is_object($msg->params)) {
-                foreach ($parameters as $pos => $parameter) {
+                foreach ($method->getParameters() as $pos => $parameter) {
                     $value = null;
                     foreach(get_object_vars($msg->params) as $key => $val) {
-                        if ($parameter->name === $key) {
+                        if ($parameter->getName() === $key) {
                             $value = $val;
                             break;
                         }
@@ -117,46 +91,25 @@ public function dispatch($msg)
             } else {
                 throw new Error('Params must be structured or omitted', ErrorCode::INVALID_REQUEST);
             }
+
             foreach ($args as $position => $value) {
                 try {
                     // If the type is structured (array or object), map it with JsonMapper
                     if (is_object($value)) {
                         // Does the parameter have a type hint?
-                        $param = $parameters[$position];
+                        $param = $method->getParameter($position);
                         if ($param->hasType()) {
-                            $paramType = $param->getType();
-                            if ($paramType instanceof ReflectionNamedType) {
-                                // We have object data to map and want the class name.
-                                // This should not include the `?` if the type was nullable.
-                                $class = $paramType->getName();
-                            } else {
-                                // Fallback for php 7.0, which is still supported (and doesn't have nullable).
-                                $class = (string)$paramType;
-                            }
+                            $class = $param->getType()->getName();
                             $value = $this->mapper->map($value, new $class());
                         }
-                    } else if (is_array($value) && isset($docBlock)) {
-                        // Get the array type from the DocBlock
-                        $type = $paramTags[$position]->getType();
-                        // For union types, use the first one that is a class array (often it is SomeClass[]|null)
-                        if ($type instanceof Types\Compound) {
-                            for ($i = 0; $t = $type->get($i); $i++) {
-                                if (
-                                    $t instanceof Types\Array_
-                                    && $t->getValueType() instanceof Types\Object_
-                                    && (string)$t->getValueType() !== 'object'
-                                ) {
-                                    $class = (string)$t->getValueType()->getFqsen();
-                                    $value = $this->mapper->mapArray($value, [], $class);
-                                    break;
-                                }
-                            }
-                        } else if ($type instanceof Types\Array_) {
-                            $class = (string)$type->getValueType()->getFqsen();
-                            $value = $this->mapper->mapArray($value, [], $class);
-                        } else {
-                            throw new Error('Type is not matching @param tag', ErrorCode::INVALID_PARAMS);
+                    } else if (is_array($value)) {
+                        if (!$method->hasParameter($position)) {
+                            throw new Error('Type information is missing', ErrorCode::INVALID_PARAMS);
                         }
+
+                        // Get the array type from the DocBlock
+                        $class = $method->getParameter($position)->getType()->getName();
+                        $value = $this->mapper->mapArray($value, [], $class);
                     }
                 } catch (JsonMapper_Exception $e) {
                     throw new Error($e->getMessage(), ErrorCode::INVALID_PARAMS, null, $e);
diff --git a/lib/Reflection/Dto/Method.php b/lib/Reflection/Dto/Method.php
new file mode 100644
index 0000000..0fc3c1d
--- /dev/null
+++ b/lib/Reflection/Dto/Method.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection\Dto;
+
+class Method
+{
+    /** @var Parameter[] */
+    private $parameters;
+
+    public function __construct(array $parameters)
+    {
+        $this->parameters = $parameters;
+    }
+
+    public function getParameters(): array
+    {
+        return $this->parameters;
+    }
+
+    public function hasParameter(int $name): bool
+    {
+        return array_key_exists($name, $this->parameters);
+    }
+
+    public function getParameter(int $name): Parameter
+    {
+        return $this->parameters[$name];
+    }
+}
diff --git a/lib/Reflection/Dto/Parameter.php b/lib/Reflection/Dto/Parameter.php
new file mode 100644
index 0000000..6754a3b
--- /dev/null
+++ b/lib/Reflection/Dto/Parameter.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection\Dto;
+
+
+class Parameter
+{
+    /** @var string */
+    private $name;
+    /** @var Type|null */
+    private $type;
+
+    public function __construct(string $name, Type $type = null)
+    {
+        $this->name = $name;
+        $this->type = $type;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function getType(): Type
+    {
+        return $this->type;
+    }
+
+    public function hasType(): bool
+    {
+        return $this->type !== null;
+    }
+}
diff --git a/lib/Reflection/Dto/Type.php b/lib/Reflection/Dto/Type.php
new file mode 100644
index 0000000..11d0134
--- /dev/null
+++ b/lib/Reflection/Dto/Type.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection\Dto;
+
+class Type
+{
+    /** @var string */
+    private $name;
+
+    public function __construct(string $name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+}
diff --git a/lib/Reflection/NativeReflection.php b/lib/Reflection/NativeReflection.php
new file mode 100644
index 0000000..dc7281e
--- /dev/null
+++ b/lib/Reflection/NativeReflection.php
@@ -0,0 +1,117 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection;
+
+
+use AdvancedJsonRpc\Error;
+use AdvancedJsonRpc\ErrorCode;
+use AdvancedJsonRpc\Reflection\Dto\Method;
+use AdvancedJsonRpc\Reflection\Dto\Parameter;
+use AdvancedJsonRpc\Reflection\Dto\Type;
+use phpDocumentor\Reflection\DocBlock\Tag;
+use phpDocumentor\Reflection\DocBlockFactory;
+use phpDocumentor\Reflection\Types;
+use ReflectionException;
+use ReflectionMethod;
+use ReflectionNamedType;
+
+class NativeReflection implements ReflectionInterface
+{
+    /** @var DocBlockFactory */
+    private $docBlockFactory;
+    /** @var \phpDocumentor\Reflection\Types\ContextFactory */
+    private $contextFactory;
+    /** @var Method[] */
+    private $methods = [];
+
+    public function __construct()
+    {
+        $this->docBlockFactory = DocBlockFactory::createInstance();
+        $this->contextFactory = new Types\ContextFactory();
+    }
+
+    public function getMethodDetails($rpcMethod, $target, $nativeMethod): Method
+    {
+        if (array_key_exists($rpcMethod, $this->methods)) {
+            return $this->methods[$rpcMethod];
+        }
+
+        try {
+            $nativeMethod = new ReflectionMethod($target, $nativeMethod);
+        } catch (ReflectionException $e) {
+            throw new Error($e->getMessage(), ErrorCode::METHOD_NOT_FOUND, null, $e);
+        }
+
+        $parameters = array_map(function($p) { return $this->mapNativeReflectionParameterToParameter($p); }, $nativeMethod->getParameters());
+
+        if ($nativeMethod->getDocComment()) {
+            $docBlock = $this->docBlockFactory->create(
+                $nativeMethod->getDocComment(),
+                $this->contextFactory->createFromReflector($nativeMethod->getDeclaringClass())
+            );
+
+            /* Improve types from the doc block */
+            if ($docBlock !== null) {
+                $docBlockParameters = [];
+
+                foreach ($docBlock->getTagsByName('param') as $param) {
+                    $docBlockParameters[$param->getVariableName()] = $this->mapDocBlockTagToParameter($param);
+                }
+
+                foreach ($parameters as $position => $param) {
+                    if (array_key_exists($param->getName(), $docBlockParameters) && $docBlockParameters[$param->getName()]->hasType())
+                    {
+                        $parameters[$position] = $docBlockParameters[$param->getName()];
+                    }
+                }
+            }
+        }
+
+        $method = new Method($parameters);
+
+        $this->methods[$rpcMethod] = $method;
+
+        return $method;
+    }
+
+    private function mapNativeReflectionParameterToParameter(\ReflectionParameter $native): Parameter
+    {
+        $type = $this->mapNativeReflectionTypeToType($native->getType());
+        return new Parameter($native->getName(), $type);
+    }
+
+    private function mapDocBlockTagToParameter(Tag $tag): Parameter
+    {
+        $type = $tag->getType();
+        // For union types, use the first one that is a class array (often it is SomeClass[]|null)
+        if ($type instanceof Types\Compound) {
+            for ($i = 0; $t = $type->get($i); $i++) {
+                if (
+                    $t instanceof Types\Array_
+                    && $t->getValueType() instanceof Types\Object_
+                    && (string)$t->getValueType() !== 'object'
+                ) {
+                    return new Parameter($tag->getVariableName(), new Type((string)$t->getValueType()->getFqsen()));
+                }
+            }
+        } else if ($type instanceof Types\Array_) {
+            return new Parameter($tag->getVariableName(), new Type((string)$type->getValueType()->getFqsen()));
+        }
+    }
+
+    /** @return Type|null */
+    private function mapNativeReflectionTypeToType(\ReflectionType $native = null)
+    {
+        if ($native instanceof ReflectionNamedType && $native->getName() !== '') {
+            // We have object data to map and want the class name.
+            // This should not include the `?` if the type was nullable.
+            return new Type($native->getName());
+        }
+        if ((string) $native !== '') {
+            // Fallback for php 7.0, which is still supported (and doesn't have nullable).
+            return new Type((string) $native);
+        }
+    }
+}
diff --git a/lib/Reflection/PhpDocumentorReflection.php b/lib/Reflection/PhpDocumentorReflection.php
new file mode 100644
index 0000000..67d6c30
--- /dev/null
+++ b/lib/Reflection/PhpDocumentorReflection.php
@@ -0,0 +1,92 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection;
+
+
+use AdvancedJsonRpc\Reflection\Dto\Method;
+use AdvancedJsonRpc\Reflection\Dto\Parameter;
+use AdvancedJsonRpc\Reflection\Dto\Type;
+use phpDocumentor\Reflection\DocBlock\Tag;
+use phpDocumentor\Reflection\File\LocalFile;
+use phpDocumentor\Reflection\Php\Argument;
+use phpDocumentor\Reflection\Php\Project;
+use phpDocumentor\Reflection\Php\ProjectFactory;
+use phpDocumentor\Reflection\Types;
+use ReflectionMethod;
+
+class PhpDocumentorReflection implements ReflectionInterface
+{
+
+    /** @var ProjectFactory */
+    private $projectFactory;
+
+    public function __construct()
+    {
+        $this->projectFactory = ProjectFactory::createInstance();
+    }
+
+    public function getMethodDetails($rpcMethod, $target, $nativeMethodName): Method
+    {
+        $nativeMethod = new ReflectionMethod($target, $nativeMethodName);
+        $projectFiles = [new LocalFile($nativeMethod->getFileName())];
+        /** @var Project $project */
+        $project = $this->projectFactory->create('php-advanced-json-rpc', $projectFiles);
+
+        /** @var \phpDocumentor\Reflection\Php\Class_ $class */
+        $class = $project->getFiles()[$nativeMethod->getFileName()]->getClasses()['\\' . $nativeMethod->class]; /* @todo add error handling of multiple classes in single file */
+        $methodName = '\\' . $nativeMethod->class . '::' . $nativeMethod->getName() . '()';
+        $method = $class->getMethods()[$methodName]; /* @todo add error handling for missing method */
+
+        $parameters = array_map(function ($a) { return $this->mapPhpDocumentorReflectionParameterToParameter($a); }, $method->getArguments());
+
+        /* Improve types from the doc block */
+        $docBlock = $method->getDocBlock();
+        if ($docBlock !== null) {
+            $docBlockParameters = [];
+
+            foreach ($method->getDocBlock()->getTagsByName('param') as $param) {
+                $docBlockParameters[$param->getVariableName()] = $this->mapDocBlockTagToParameter($param);
+            }
+
+            foreach ($parameters as $position => $param) {
+                if (array_key_exists($param->getName(), $docBlockParameters) && $docBlockParameters[$param->getName()]->hasType())
+                {
+                    $parameters[$position] = $docBlockParameters[$param->getName()];
+                }
+            }
+        }
+
+        return new Method($parameters);
+    }
+
+    private function mapPhpDocumentorReflectionParameterToParameter(Argument $argument): Parameter
+    {
+        $phpDocumentorType = $argument->getType();
+        if ($phpDocumentorType === null) {
+            return new Parameter($argument->getName());
+        }
+
+        return new Parameter($argument->getName(), new Type((string) $phpDocumentorType));
+    }
+
+    private function mapDocBlockTagToParameter(Tag $tag): Parameter
+    {
+        $type = $tag->getType();
+        // For union types, use the first one that is a class array (often it is SomeClass[]|null)
+        if ($type instanceof Types\Compound) {
+            for ($i = 0; $t = $type->get($i); $i++) {
+                if (
+                    $t instanceof Types\Array_
+                    && $t->getValueType() instanceof Types\Object_
+                    && (string)$t->getValueType() !== 'object'
+                ) {
+                    return new Parameter($tag->getVariableName(), new Type((string)$t->getValueType()->getFqsen()));
+                }
+            }
+        } else if ($type instanceof Types\Array_) {
+            return new Parameter($tag->getVariableName(), new Type((string)$type->getValueType()->getFqsen()));
+        }
+    }
+}
diff --git a/lib/Reflection/ReflectionInterface.php b/lib/Reflection/ReflectionInterface.php
new file mode 100644
index 0000000..541d19f
--- /dev/null
+++ b/lib/Reflection/ReflectionInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AdvancedJsonRpc\Reflection;
+
+use AdvancedJsonRpc\Reflection\Dto\Method;
+
+interface ReflectionInterface
+{
+    public function getMethodDetails($rpcMethod, $target, $nativeMethod): Method;
+}