diff --git a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
index 71ace29d1c..5f6e99169c 100644
--- a/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
@@ -305,7 +305,7 @@ class PhpArrayAdapter implements AdapterInterface, CacheInterface, PruneableInte
     public static function throwOnRequiredClass($class)
     {
         $e = new \ReflectionException("Class $class does not exist");
-        $trace = $e->getTrace();
+        $trace = debug_backtrace();
         $autoloadFrame = [
             'function' => 'spl_autoload_call',
             'args' => [$class],
diff --git a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
index 18917d8d9f..ba50c62cd6 100644
--- a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
+++ b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
@@ -72,7 +72,7 @@ class ClassExistenceResource implements SelfCheckingResourceInterface
                 spl_autoload_register(__CLASS__.'::throwOnRequiredClass');
             }
             $autoloadedClass = self::$autoloadedClass;
-            self::$autoloadedClass = $this->resource;
+            self::$autoloadedClass = ltrim($this->resource, '\\');
 
             try {
                 $exists = class_exists($this->resource) || interface_exists($this->resource, false) || trait_exists($this->resource, false);
@@ -153,7 +153,7 @@ class ClassExistenceResource implements SelfCheckingResourceInterface
             throw $e;
         }
 
-        $trace = $e->getTrace();
+        $trace = debug_backtrace();
         $autoloadFrame = [
             'function' => 'spl_autoload_call',
             'args' => [$class],
diff --git a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
index 14be8444b2..c376903287 100644
--- a/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
+++ b/src/Symfony/Component/PropertyAccess/PropertyAccessor.php
@@ -188,13 +188,14 @@ class PropertyAccessor implements PropertyAccessorInterface
             return;
         }
 
-        if (isset($trace[$i]['file']) && __FILE__ === $trace[$i]['file'] && \array_key_exists(0, $trace[$i]['args'])) {
+        if (isset($trace[$i]['file']) && __FILE__ === $trace[$i]['file']) {
             $pos = strpos($message, $delim = 'must be of the type ') ?: (strpos($message, $delim = 'must be an instance of ') ?: strpos($message, $delim = 'must implement interface '));
             $pos += \strlen($delim);
-            $type = $trace[$i]['args'][0];
-            $type = \is_object($type) ? \get_class($type) : \gettype($type);
+            $j = strpos($message, ',', $pos);
+            $type = substr($message, 2 + $j, strpos($message, ' given', $j) - $j - 2);
+            $message = substr($message, $pos, $j - $pos);
 
-            throw new InvalidArgumentException(sprintf('Expected argument of type "%s", "%s" given at property path "%s".', substr($message, $pos, strpos($message, ',', $pos) - $pos), $type, $propertyPath));
+            throw new InvalidArgumentException(sprintf('Expected argument of type "%s", "%s" given at property path "%s".', $message, 'NULL' === $type ? 'null' : $type, $propertyPath));
         }
     }
 
diff --git a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
index 1b0e47b106..218f18730f 100644
--- a/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
+++ b/src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
@@ -546,7 +546,7 @@ class PropertyAccessorTest extends TestCase
     public function testThrowTypeErrorWithNullArgument()
     {
         $this->expectException('Symfony\Component\PropertyAccess\Exception\InvalidArgumentException');
-        $this->expectExceptionMessage('Expected argument of type "DateTime", "NULL" given');
+        $this->expectExceptionMessage('Expected argument of type "DateTime", "null" given');
         $object = new TypeHinted();
 
         $this->propertyAccessor->setValue($object, 'date', null);