diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index bdeeba1..b3b51c2 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -110,7 +110,7 @@ public function get($key = '') {
    * {@inheritdoc}
    */
   public function setData(array $data) {
-    $this->data = $data;
+    parent::setData($data);
     $this->resetOverriddenData();
     return $this;
   }
diff --git a/core/lib/Drupal/Core/Config/ConfigBase.php b/core/lib/Drupal/Core/Config/ConfigBase.php
index b0db1b6..37e0d80 100644
--- a/core/lib/Drupal/Core/Config/ConfigBase.php
+++ b/core/lib/Drupal/Core/Config/ConfigBase.php
@@ -161,7 +161,7 @@ public function get($key = '') {
    * @return $this
    *   The configuration object.
    *
-   * @throws \Exception
+   * @throws \Drupal\Core\Config\ConfigValueException
    *   If any key in $data in any depth contains a dot.
    */
   public function setData(array $data) {
@@ -178,13 +178,13 @@ public function setData(array $data) {
    *
    * @return null
    *
-   * @throws \Exception
+   * @throws \Drupal\Core\Config\ConfigValueException
    *   If any key in $data in any depth contains a dot.
    */
   protected function validateKeys(array $data) {
     foreach ($data as $key => $value) {
       if (strpos($key, '.') !== FALSE) {
-        throw new \Exception(String::format('@key key contains a dot which is not supported.', array('@key' => $key)));
+        throw new ConfigValueException(String::format('@key key contains a dot which is not supported.', array('@key' => $key)));
       }
       if (is_array($value)) {
         $this->validateKeys($value);
@@ -203,7 +203,7 @@ protected function validateKeys(array $data) {
    * @return $this
    *   The configuration object.
    *
-   * @throws \Exception
+   * @throws \Drupal\Core\Config\ConfigValueException
    *   If $value is an array and any of its keys in any depth contains a dot.
    */
   public function set($key, $value) {
diff --git a/core/modules/config/src/Tests/ConfigCRUDTest.php b/core/modules/config/src/Tests/ConfigCRUDTest.php
index dc6de36..5358c06 100644
--- a/core/modules/config/src/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/src/Tests/ConfigCRUDTest.php
@@ -9,6 +9,7 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\Core\Config\ConfigNameException;
+use Drupal\Core\Config\ConfigValueException;
 use Drupal\Core\Config\InstallStorage;
 use Drupal\simpletest\DrupalUnitTestBase;
 use Drupal\Core\Config\FileStorage;
@@ -190,6 +191,31 @@ function testNameValidation() {
   }
 
   /**
+   * Tests the validation of configuration object values.
+   */
+  function testValueValidation() {
+    // Verify that setData() will catch dotted keys.
+    $message = 'Expected ConfigValueException was thrown from setData() for value with dotted keys.';
+    try {
+      \Drupal::config('namespace.object')->setData(array('key.value' => 12))->save();
+      $this->fail($message);
+    }
+    catch (ConfigValueException $e) {
+      $this->pass($message);
+    }
+
+    // Verify that set() will catch dotted keys.
+    $message = 'Expected ConfigValueException was thrown from set() for value with dotted keys.';
+    try {
+      \Drupal::config('namespace.object')->set('foo', array('key.value' => 12))->save();
+      $this->fail($message);
+    }
+    catch (ConfigValueException $e) {
+      $this->pass($message);
+    }
+  }
+
+  /**
    * Tests data type handling.
    */
   public function testDataTypes() {
diff --git a/core/lib/Drupal/Core/Config/ConfigValueException.php b/core/lib/Drupal/Core/Config/ConfigValueException.php
new file mode 100644
index 0000000..9802228
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigValueException.php
@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigValueException.
+ */
+
+namespace Drupal\Core\Config;
+
+/**
+ * Exception thrown when config object values are invalid.
+ */
+class ConfigValueException extends ConfigException {}