diff --git a/src/Symfony/Component/Config/Resource/DirectoryResource.php b/src/Symfony/Component/Config/Resource/DirectoryResource.php
index 38413934f35d..eaef8d5b1e9b 100644
--- a/src/Symfony/Component/Config/Resource/DirectoryResource.php
+++ b/src/Symfony/Component/Config/Resource/DirectoryResource.php
@@ -26,11 +26,17 @@ class DirectoryResource implements SelfCheckingResourceInterface, \Serializable
      *
      * @param string      $resource The file path to the resource
      * @param string|null $pattern  A pattern to restrict monitored files
+     *
+     * @throws \InvalidArgumentException
      */
     public function __construct($resource, $pattern = null)
     {
-        $this->resource = $resource;
+        $this->resource = realpath($resource);
         $this->pattern = $pattern;
+
+        if (false === $this->resource || !is_dir($this->resource)) {
+            throw new \InvalidArgumentException(sprintf('The directory "%s" does not exist.', $resource));
+        }
     }
 
     /**
diff --git a/src/Symfony/Component/Config/Resource/FileResource.php b/src/Symfony/Component/Config/Resource/FileResource.php
index 54a974caef3d..f94640fffc34 100644
--- a/src/Symfony/Component/Config/Resource/FileResource.php
+++ b/src/Symfony/Component/Config/Resource/FileResource.php
@@ -29,10 +29,16 @@ class FileResource implements SelfCheckingResourceInterface, \Serializable
      * Constructor.
      *
      * @param string $resource The file path to the resource
+     *
+     * @throws \InvalidArgumentException
      */
     public function __construct($resource)
     {
         $this->resource = realpath($resource);
+
+        if (false === $this->resource) {
+            throw new \InvalidArgumentException(sprintf('The file "%s" does not exist.', $resource));
+        }
     }
 
     /**
@@ -40,11 +46,11 @@ public function __construct($resource)
      */
     public function __toString()
     {
-        return (string) $this->resource;
+        return $this->resource;
     }
 
     /**
-     * @return string|false The canonicalized, absolute path to the resource or false if the resource does not exist.
+     * @return string The canonicalized, absolute path to the resource.
      */
     public function getResource()
     {
@@ -56,11 +62,7 @@ public function getResource()
      */
     public function isFresh($timestamp)
     {
-        if (false === $this->resource || !file_exists($this->resource)) {
-            return false;
-        }
-
-        return filemtime($this->resource) <= $timestamp;
+        return file_exists($this->resource) && @filemtime($this->resource) <= $timestamp;
     }
 
     public function serialize()
diff --git a/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
index 2bbaadc3a721..507224f7c4da 100644
--- a/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/DirectoryResourceTest.php
@@ -19,7 +19,7 @@ class DirectoryResourceTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        $this->directory = sys_get_temp_dir().'/symfonyDirectoryIterator';
+        $this->directory = realpath(sys_get_temp_dir()).'/symfonyDirectoryIterator';
         if (!file_exists($this->directory)) {
             mkdir($this->directory);
         }
@@ -58,17 +58,31 @@ public function testGetResource()
 
     public function testGetPattern()
     {
-        $resource = new DirectoryResource('foo', 'bar');
+        $resource = new DirectoryResource($this->directory, 'bar');
         $this->assertEquals('bar', $resource->getPattern());
     }
 
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessageRegExp /The directory ".*" does not exist./
+     */
+    public function testResourceDoesNotExist()
+    {
+        $resource = new DirectoryResource('/____foo/foobar'.mt_rand(1, 999999));
+    }
+
     public function testIsFresh()
     {
         $resource = new DirectoryResource($this->directory);
         $this->assertTrue($resource->isFresh(time() + 10), '->isFresh() returns true if the resource has not changed');
         $this->assertFalse($resource->isFresh(time() - 86400), '->isFresh() returns false if the resource has been updated');
+    }
+
+    public function testIsFreshForDeletedResources()
+    {
+        $resource = new DirectoryResource($this->directory);
+        $this->removeDirectory($this->directory);
 
-        $resource = new DirectoryResource('/____foo/foobar'.mt_rand(1, 999999));
         $this->assertFalse($resource->isFresh(time()), '->isFresh() returns false if the resource does not exist');
     }
 
diff --git a/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php b/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
index db85cf7bd0ee..4151f66bc5ca 100644
--- a/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
+++ b/src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php
@@ -29,6 +29,10 @@ protected function setUp()
 
     protected function tearDown()
     {
+        if (!file_exists($this->file)) {
+            return;
+        }
+
         unlink($this->file);
     }
 
@@ -42,14 +46,27 @@ public function testToString()
         $this->assertSame(realpath($this->file), (string) $this->resource);
     }
 
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessageRegExp /The file ".*" does not exist./
+     */
+    public function testResourceDoesNotExist()
+    {
+        $resource = new FileResource('/____foo/foobar'.mt_rand(1, 999999));
+    }
+
     public function testIsFresh()
     {
         $this->assertTrue($this->resource->isFresh($this->time), '->isFresh() returns true if the resource has not changed in same second');
         $this->assertTrue($this->resource->isFresh($this->time + 10), '->isFresh() returns true if the resource has not changed');
         $this->assertFalse($this->resource->isFresh($this->time - 86400), '->isFresh() returns false if the resource has been updated');
+    }
 
-        $resource = new FileResource('/____foo/foobar'.mt_rand(1, 999999));
-        $this->assertFalse($resource->isFresh($this->time), '->isFresh() returns false if the resource does not exist');
+    public function testIsFreshForDeletedResources()
+    {
+        unlink($this->file);
+
+        $this->assertFalse($this->resource->isFresh($this->time), '->isFresh() returns false if the resource does not exist');
     }
 
     public function testSerializeUnserialize()