diff --git a/framework/YiiBase.php b/framework/YiiBase.php
index 62c2fb6..2d08fe4 100644
--- a/framework/YiiBase.php
+++ b/framework/YiiBase.php
@@ -309,9 +309,6 @@ class YiiBase
 	/**
 	 * Creates a new object using the given configuration.
 	 *
-	 * The class of the object can be any class. It does not have to
-	 * extend from [[Object]] or [[Component]].
-	 *
 	 * The configuration can be either a string or an array.
 	 * If a string, it is treated as the *object type*; if an array,
 	 * it must contain a `class` element specifying the *object type*, and
@@ -321,17 +318,9 @@ class YiiBase
 	 * The object type can be either a class name or the [[getAlias|alias]] of
 	 * the class. For example,
 	 *
-	 * - `\app\components\GoogleMap`: full qualified namespaced class.
+	 * - `\app\components\GoogleMap`: fully-qualified namespaced class.
 	 * - `@app/components/GoogleMap`: an alias
 	 *
-	 * This method does the following steps to create an object:
-	 *
-	 * - create the object using the PHP `new` operator;
-	 * - if [[objectConfig]] contains the configuration for the object class,
-	 *   it will be merged with the configuration passed to this method;
-	 * - initialize the object properties using the configuration passed to this method;
-	 * - call the `init` method of the object if it implements the [[\yii\base\Initable]] interface.
-	 *
 	 * Below are some usage examples:
 	 *
 	 * ~~~
@@ -342,16 +331,26 @@ class YiiBase
 	 * ));
 	 * ~~~
 	 *
-	 * Any additional parameters passed to this method will be
-	 * passed to the constructor of the object being created.
+	 * This method can be used to create any object as long as the object's constructor is
+	 * defined like the following:
+	 *
+	 * ~~~
+	 * public function __construct(..., $config = array()) {
+	 * }
+	 * ~~~
+	 *
+	 * The method will pass the given configuration as the last parameter of the constructor,
+	 * and any additional parameters to this method will be passed as the rest of the constructor parameters.
 	 *
-	 * @param string|array $config the configuration. It can be either a string or an array.
+	 * @param string|array $config the configuration. It can be either a string representing the class name
+	 * or an array representing the object configuration.
 	 * @return mixed the created object
-	 * @throws Exception if the configuration is invalid.
-	 * @see \yii\base\Object::newInstance()
+	 * @throws \yii\base\BadConfigException if the configuration is invalid.
 	 */
 	public static function createObject($config)
 	{
+		static $reflections = array();
+
 		if (is_string($config)) {
 			$class = $config;
 			$config = array();
@@ -359,7 +358,7 @@ class YiiBase
 			$class = $config['class'];
 			unset($config['class']);
 		} else {
-			throw new Exception('Object configuration must be an array containing a "class" element.');
+			throw new \yii\base\BadConfigException('Object configuration must be an array containing a "class" element.');
 		}
 
 		if (!class_exists($class, false)) {
@@ -367,37 +366,21 @@ class YiiBase
 		}
 
 		if (($n = func_num_args()) > 1) {
-			$args = func_get_args();
-			if ($n === 2) {
-				$object = new $class($args[1]);
-			} elseif ($n === 3) {
-				$object = new $class($args[1], $args[2]);
-			} elseif ($n === 4) {
-				$object = new $class($args[1], $args[2], $args[3]);
+			/** @var $reflection \ReflectionClass */
+			if (isset($reflections[$class])) {
+				$reflection = $reflections[$class];
 			} else {
-				array_shift($args); // remove $config
-				$r = new \ReflectionClass($class);
-				$object = $r->newInstanceArgs($args);
+				$reflection = $reflections[$class] = new \ReflectionClass($class);
+			}
+			$args = func_get_args();
+			array_shift($args); // remove $config
+			if ($config !== array()) {
+				$args[] = $config;
 			}
+			return $reflection->newInstanceArgs($args);
 		} else {
-			$object = new $class;
+			return $config === array() ? new $class : new $class($config);
 		}
-
-		$class = get_class($object);
-
-		if (isset(\Yii::$objectConfig[$class])) {
-			$config = array_merge(\Yii::$objectConfig[$class], $config);
-		}
-
-		foreach ($config as $name => $value) {
-			$object->$name = $value;
-		}
-
-		if ($object instanceof \yii\base\Initable) {
-			$object->init();
-		}
-
-		return $object;
 	}
 
 	/**
@@ -545,14 +528,22 @@ class YiiBase
 		if (self::$application !== null)
 		{
 			if ($source === null)
-				$source = $category === 'yii' ? 'coreMessages' : 'messages';
+					{
+						$source = $category === 'yii' ? 'coreMessages' : 'messages';
+					}
 			if (($source = self::$application->getComponent($source)) !== null)
-				$message = $source->translate($category, $message, $language);
+					{
+						$message = $source->translate($category, $message, $language);
+					}
 		}
 		if ($params === array())
-			return $message;
+				{
+					return $message;
+				}
 		if (!is_array($params))
-			$params = array($params);
+				{
+					$params = array($params);
+				}
 		if (isset($params[0])) // number choice
 		{
 			if (strpos($message, '|') !== false)
@@ -563,8 +554,10 @@ class YiiBase
 					$expressions = self::$application->getLocale($language)->getPluralRules();
 					if ($n = min(count($chunks), count($expressions)))
 					{
-						for ($i = 0;$i < $n;$i++)
-							$chunks[$i] = $expressions[$i] . '#' . $chunks[$i];
+						for ($i = 0; $i < $n; $i++)
+								{
+									$chunks[$i] = $expressions[$i] . '#' . $chunks[$i];
+								}
 
 						$message = implode('|', $chunks);
 					}
@@ -572,7 +565,9 @@ class YiiBase
 				$message = CChoiceFormat::format($message, $params[0]);
 			}
 			if (!isset($params['{n}']))
-				$params['{n}'] = $params[0];
+					{
+						$params['{n}'] = $params[0];
+					}
 			unset($params[0]);
 		}
 		return $params !== array() ? strtr($message, $params) : $message;
diff --git a/framework/base/Application.php b/framework/base/Application.php
index 5f4971d..4a5c089 100644
--- a/framework/base/Application.php
+++ b/framework/base/Application.php
@@ -202,14 +202,15 @@ class Application extends Module
 	 * @param string $route the route (e.g. `post/create`)
 	 * @param array $params the parameters to be passed to the controller action
 	 * @return integer the exit status (0 means normal, non-zero values mean abnormal)
-	 * @throws Exception if the route cannot be resolved into a controller
+	 * @throws BadRequestException if the route cannot be resolved into a controller
 	 */
 	public function runController($route, $params = array())
 	{
 		$result = $this->createController($route);
 		if ($result === false) {
-			throw new Exception(\Yii::t('yii', 'Unable to resolve the request.'));
+			throw new BadRequestException(\Yii::t('yii', 'Unable to resolve the request.'));
 		}
+		/** @var $controller Controller */
 		list($controller, $action) = $result;
 		$priorController = $this->controller;
 		$this->controller = $controller;
@@ -233,13 +234,13 @@ class Application extends Module
 	/**
 	 * Sets the directory that stores runtime files.
 	 * @param string $path the directory that stores runtime files.
-	 * @throws Exception if the directory does not exist or is not writable
+	 * @throws BadParamException if the directory does not exist or is not writable
 	 */
 	public function setRuntimePath($path)
 	{
 		$p = \Yii::getAlias($path);
 		if ($p === false || !is_dir($p) || !is_writable($path)) {
-			throw new Exception("Application runtime path \"$path\" is invalid. Please make sure it is a directory writable by the Web server process.");
+			throw new BadParamException("Application runtime path \"$path\" is invalid. Please make sure it is a directory writable by the Web server process.");
 		} else {
 			$this->_runtimePath = $p;
 		}
diff --git a/framework/base/ApplicationComponent.php b/framework/base/ApplicationComponent.php
index 6e18e67..c93ff98 100644
--- a/framework/base/ApplicationComponent.php
+++ b/framework/base/ApplicationComponent.php
@@ -15,7 +15,7 @@ namespace yii\base;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-abstract class ApplicationComponent extends Component implements Initable
+abstract class ApplicationComponent extends Component
 {
 	/**
 	 * Initializes the application component.
diff --git a/framework/base/BadConfigException.php b/framework/base/BadConfigException.php
new file mode 100644
index 0000000..e0e20f9
--- /dev/null
+++ b/framework/base/BadConfigException.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * BadConfigException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * BadConfigException represents an exception caused by incorrect object configuration.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class BadConfigException extends \Exception
+{
+}
+
diff --git a/framework/base/BadMethodException.php b/framework/base/BadMethodException.php
new file mode 100644
index 0000000..6ccc10c
--- /dev/null
+++ b/framework/base/BadMethodException.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * BadMethodException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * BadMethodException represents an exception caused by accessing unknown object methods.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class BadMethodException extends \Exception
+{
+}
+
diff --git a/framework/base/BadParamException.php b/framework/base/BadParamException.php
new file mode 100644
index 0000000..f250d2b
--- /dev/null
+++ b/framework/base/BadParamException.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * BadParamException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * BadParamException represents an exception caused by incorrect method parameters.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class BadParamException extends \Exception
+{
+}
+
diff --git a/framework/base/BadPropertyException.php b/framework/base/BadPropertyException.php
new file mode 100644
index 0000000..7395dc9
--- /dev/null
+++ b/framework/base/BadPropertyException.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * BadPropertyException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * BadPropertyException represents an exception caused by accessing unknown object properties.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class BadPropertyException extends \Exception
+{
+}
+
diff --git a/framework/base/BadRequestException.php b/framework/base/BadRequestException.php
new file mode 100644
index 0000000..2849a43
--- /dev/null
+++ b/framework/base/BadRequestException.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * BadRequestException class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * BadRequestException represents an exception caused by incorrect end user request.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class BadRequestException extends \Exception
+{
+}
+
diff --git a/framework/base/Component.php b/framework/base/Component.php
index e8e814b..fb9657a 100644
--- a/framework/base/Component.php
+++ b/framework/base/Component.php
@@ -40,7 +40,7 @@ class Component extends \yii\base\Object
 	 * @param string $name the property name
 	 * @return mixed the property value, event handlers attached to the event,
 	 * the named behavior, or the value of a behavior's property
-	 * @throws Exception if the property is not defined
+	 * @throws BadPropertyException if the property is not defined
 	 * @see __set
 	 */
 	public function __get($name)
@@ -58,7 +58,7 @@ class Component extends \yii\base\Object
 				}
 			}
 		}
-		throw new Exception('Getting unknown property: ' . get_class($this) . '.' . $name);
+		throw new BadPropertyException('Getting unknown property: ' . get_class($this) . '.' . $name);
 	}
 
 	/**
@@ -74,7 +74,7 @@ class Component extends \yii\base\Object
 	 * will be implicitly called when executing `$component->property = $value;`.
 	 * @param string $name the property name or the event name
 	 * @param mixed $value the property value
-	 * @throws Exception if the property is not defined or read-only.
+	 * @throws BadPropertyException if the property is not defined or read-only.
 	 * @see __get
 	 */
 	public function __set($name, $value)
@@ -104,9 +104,9 @@ class Component extends \yii\base\Object
 			}
 		}
 		if (method_exists($this, 'get' . $name)) {
-			throw new Exception('Setting read-only property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Setting read-only property: ' . get_class($this) . '.' . $name);
 		} else {
-			throw new Exception('Setting unknown property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Setting unknown property: ' . get_class($this) . '.' . $name);
 		}
 	}
 
@@ -150,7 +150,7 @@ class Component extends \yii\base\Object
 	 * Do not call this method directly as it is a PHP magic method that
 	 * will be implicitly called when executing `unset($component->property)`.
 	 * @param string $name the property name
-	 * @throws Exception if the property is read only.
+	 * @throws BadPropertyException if the property is read only.
 	 */
 	public function __unset($name)
 	{
@@ -170,7 +170,7 @@ class Component extends \yii\base\Object
 			}
 		}
 		if (method_exists($this, 'get' . $name)) {
-			throw new Exception('Unsetting read-only property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Unsetting read-only property: ' . get_class($this) . '.' . $name);
 		}
 	}
 
@@ -185,8 +185,8 @@ class Component extends \yii\base\Object
 	 * will be implicitly called when an unknown method is being invoked.
 	 * @param string $name the method name
 	 * @param array $params method parameters
-	 * @throws Exception when calling unknown method
 	 * @return mixed the method return value
+	 * @throws BadMethodException when calling unknown method
 	 */
 	public function __call($name, $params)
 	{
@@ -204,7 +204,7 @@ class Component extends \yii\base\Object
 			}
 		}
 
-		throw new Exception('Calling unknown method: ' . get_class($this) . "::$name()");
+		throw new BadMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
 	}
 
 	/**
diff --git a/framework/base/Controller.php b/framework/base/Controller.php
index a93414e..f8da2e0 100644
--- a/framework/base/Controller.php
+++ b/framework/base/Controller.php
@@ -25,7 +25,7 @@ namespace yii\base;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Controller extends Component implements Initable
+class Controller extends Component
 {
 	/**
 	 * @var string ID of this controller
@@ -195,11 +195,11 @@ class Controller extends Component implements Initable
 	 * This method is invoked when the controller cannot find the requested action.
 	 * The default implementation simply throws an exception.
 	 * @param string $actionID the missing action name
-	 * @throws Exception whenever this method is invoked
+	 * @throws BadRequestException whenever this method is invoked
 	 */
 	public function missingAction($actionID)
 	{
-		throw new Exception(\Yii::t('yii', 'The system is unable to find the requested action "{action}".',
+		throw new BadRequestException(\Yii::t('yii', 'The system is unable to find the requested action "{action}".',
 			array('{action}' => $actionID == '' ? $this->defaultAction : $actionID)));
 	}
 
diff --git a/framework/base/Dictionary.php b/framework/base/Dictionary.php
index d94c3cf..4c73463 100644
--- a/framework/base/Dictionary.php
+++ b/framework/base/Dictionary.php
@@ -182,7 +182,7 @@ class Dictionary extends Object implements \IteratorAggregate, \ArrayAccess, \Co
 	 * Copies iterable data into the dictionary.
 	 * Note, existing data in the dictionary will be cleared first.
 	 * @param mixed $data the data to be copied from, must be an array or an object implementing `Traversable`
-	 * @throws Exception if data is neither an array nor an iterator.
+	 * @throws BadParamException if data is neither an array nor an iterator.
 	 */
 	public function copyFrom($data)
 	{
@@ -197,7 +197,7 @@ class Dictionary extends Object implements \IteratorAggregate, \ArrayAccess, \Co
 				$this->add($key, $value);
 			}
 		} else {
-			throw new Exception('Data must be either an array or an object implementing Traversable.');
+			throw new BadParamException('Data must be either an array or an object implementing Traversable.');
 		}
 	}
 
@@ -214,7 +214,7 @@ class Dictionary extends Object implements \IteratorAggregate, \ArrayAccess, \Co
 	 *
 	 * @param array|\Traversable $data the data to be merged with. It must be an array or object implementing Traversable
 	 * @param boolean $recursive whether the merging should be recursive.
-	 * @throws Exception if data is neither an array nor an object implementing `Traversable`.
+	 * @throws BadParamException if data is neither an array nor an object implementing `Traversable`.
 	 */
 	public function mergeWith($data, $recursive = true)
 	{
@@ -238,7 +238,7 @@ class Dictionary extends Object implements \IteratorAggregate, \ArrayAccess, \Co
 				}
 			}
 		} else {
-			throw new Exception('The data to be merged with must be an array or an object implementing Traversable.');
+			throw new BadParamException('The data to be merged with must be an array or an object implementing Traversable.');
 		}
 	}
 
diff --git a/framework/base/Initable.php b/framework/base/Initable.php
deleted file mode 100644
index eb2d3bd..0000000
--- a/framework/base/Initable.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-/**
- * Initable interface file.
- *
- * @link http://www.yiiframework.com/
- * @copyright Copyright &copy; 2008-2012 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\base;
-
-/**
- * Initable is an interface indicating a class needs initialization to work properly.
- *
- * Initable requires a class to implement the [[init()]] method.
- * When [[\Yii::createObject()]] is being used to create a new component which implements
- * Initable, it will call the [[init()]] method after setting the initial values of the
- * component properties.
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @since 2.0
- */
-interface Initable
-{
-	/**
-	 * Initializes this component.
-	 * This method is invoked by [[\Yii::createObject]] after its creates the new
-	 * component instance and initializes the component properties. In other words,
-	 * at this stage, the component has been fully configured.
-	 */
-	public function init();
-}
diff --git a/framework/base/Model.php b/framework/base/Model.php
index 4a3ba3b..eee5715 100644
--- a/framework/base/Model.php
+++ b/framework/base/Model.php
@@ -279,6 +279,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 	 * Creates validator objects based on the validation rules specified in [[rules()]].
 	 * Unlike [[getValidators()]], each time this method is called, a new list of validators will be returned.
 	 * @return Vector validators
+	 * @throws BadConfigException if any validation rule configuration is invalid
 	 */
 	public function createValidators()
 	{
@@ -288,7 +289,7 @@ class Model extends Component implements \IteratorAggregate, \ArrayAccess
 				$validator = \yii\validators\Validator::createValidator($rule[1], $this, $rule[0], array_slice($rule, 2));
 				$validators->add($validator);
 			} else {
-				throw new Exception('Invalid validation rule: a rule must specify both attribute names and validator type.');
+				throw new BadConfigException('Invalid validation rule: a rule must specify both attribute names and validator type.');
 			}
 		}
 		return $validators;
diff --git a/framework/base/Module.php b/framework/base/Module.php
index 2d90785..50a12fd 100644
--- a/framework/base/Module.php
+++ b/framework/base/Module.php
@@ -27,7 +27,7 @@ use yii\util\FileHelper;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-abstract class Module extends Component implements Initable
+abstract class Module extends Component
 {
 	/**
 	 * @var array custom module parameters (name => value).
@@ -584,7 +584,7 @@ abstract class Module extends Component implements Initable
 			}
 			if (class_exists($className, false) && is_subclass_of($className, '\yii\base\Controller')) {
 				return array(
-					$className::newInstance(array(), $id, $this),
+					new $className($id, $this),
 					$route,
 				);
 			}
diff --git a/framework/base/Object.php b/framework/base/Object.php
index 770234a..1811986 100644
--- a/framework/base/Object.php
+++ b/framework/base/Object.php
@@ -21,8 +21,32 @@ class Object
 {
 	/**
 	 * Constructor.
+	 * The default implementation does two things:
+	 *
+	 * - Initializes the object with the given configuration `$config`.
+	 * - Call [[init()]].
+	 *
+	 * If this method is overridden in a child class, it is recommended that
+	 *
+	 * - the last parameter of the constructor is a configuration array, like `$config` here.
+	 * - call the parent implementation at the end of the constructor.
+	 *
+	 * @param array $config name-value pairs that will be used to initialize the object properties
+	 */
+	public function __construct($config = array())
+	{
+		foreach ($config as $name => $value) {
+			$this->$name = $value;
+		}
+		$this->init();
+	}
+
+	/**
+	 * Initializes the object.
+	 * This method is invoked at the end of the constructor after the object is initialized with the
+	 * given configuration.
 	 */
-	public function __construct()
+	public function init()
 	{
 	}
 
@@ -34,7 +58,7 @@ class Object
 	 * @param string $name the property name
 	 * @return mixed the property value, event handlers attached to the event,
 	 * the named behavior, or the value of a behavior's property
-	 * @throws Exception if the property is not defined
+	 * @throws BadPropertyException if the property is not defined
 	 * @see __set
 	 */
 	public function __get($name)
@@ -43,7 +67,7 @@ class Object
 		if (method_exists($this, $getter)) {
 			return $this->$getter();
 		} else {
-			throw new Exception('Getting unknown property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Getting unknown property: ' . get_class($this) . '.' . $name);
 		}
 	}
 
@@ -54,7 +78,7 @@ class Object
 	 * will be implicitly called when executing `$object->property = $value;`.
 	 * @param string $name the property name or the event name
 	 * @param mixed $value the property value
-	 * @throws Exception if the property is not defined or read-only.
+	 * @throws BadPropertyException if the property is not defined or read-only.
 	 * @see __get
 	 */
 	public function __set($name, $value)
@@ -63,9 +87,9 @@ class Object
 		if (method_exists($this, $setter)) {
 			$this->$setter($value);
 		} elseif (method_exists($this, 'get' . $name)) {
-			throw new Exception('Setting read-only property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Setting read-only property: ' . get_class($this) . '.' . $name);
 		} else {
-			throw new Exception('Setting unknown property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Setting unknown property: ' . get_class($this) . '.' . $name);
 		}
 	}
 
@@ -99,7 +123,7 @@ class Object
 	 * Note that if the property is not defined, this method will do nothing.
 	 * If the property is read-only, it will throw an exception.
 	 * @param string $name the property name
-	 * @throws Exception if the property is read only.
+	 * @throws BadPropertyException if the property is read only.
 	 */
 	public function __unset($name)
 	{
@@ -108,7 +132,7 @@ class Object
 			// write property
 			$this->$setter(null);
 		} elseif (method_exists($this, 'get' . $name)) {
-			throw new Exception('Unsetting read-only property: ' . get_class($this) . '.' . $name);
+			throw new BadPropertyException('Unsetting read-only property: ' . get_class($this) . '.' . $name);
 		}
 	}
 
@@ -121,7 +145,7 @@ class Object
 	 * will be implicitly called when an unknown method is being invoked.
 	 * @param string $name the method name
 	 * @param array $params method parameters
-	 * @throws Exception when calling unknown method
+	 * @throws BadMethodException when calling unknown method
 	 * @return mixed the method return value
 	 */
 	public function __call($name, $params)
@@ -133,7 +157,7 @@ class Object
 				return call_user_func_array($func, $params);
 			}
 		}
-		throw new Exception('Unknown method: ' . get_class($this) . "::$name()");
+		throw new BadMethodException('Unknown method: ' . get_class($this) . "::$name()");
 	}
 
 	/**
@@ -148,7 +172,7 @@ class Object
 	 */
 	public function hasProperty($name, $checkVar = true)
 	{
-		return $this->canGetProperty($name, false) || $this->canSetProperty($name, false) || $checkVar && property_exists($this, $name);
+		return $this->canGetProperty($name, $checkVar) || $this->canSetProperty($name, false);
 	}
 
 	/**
@@ -176,86 +200,6 @@ class Object
 	 */
 	public function canSetProperty($name, $checkVar = true)
 	{
-		return $checkVar && property_exists($this, $name) || method_exists($this, 'set' . $name);
-	}
-
-	/**
-	 * Creates a new instance of the calling class.
-	 *
-	 * The newly created object will be initialized with the specified configuration.
-	 *
-	 * Extra parameters passed to this method will be used as the parameters to the object
-	 * constructor.
-	 *
-	 * This method does the following steps to create a object:
-	 *
-	 * - create the object using the PHP `new` operator;
-	 * - if [[Yii::objectConfig]] contains the configuration for the object class,
-	 *   it will be merged with the $config parameter;
-	 * - initialize the object properties using the configuration passed to this method;
-	 * - call the `init` method of the object if it implements the [[yii\base\Initable]] interface.
-	 *
-	 * For example,
-	 *
-	 * ~~~
-	 * class Foo extends \yii\base\Object implements \yii\base\Initable
-	 * {
-	 *	 public $c;
-	 *	 public function __construct($a, $b)
-	 *	 {
-	 *		 ...
-	 *	 }
-	 *	 public function init()
-	 *	 {
-	 *		 ...
-	 *	 }
-	 * }
-	 *
-	 * $model = Foo::newInstance(array('c' => 3), 1, 2);
-	 * // which is equivalent to the following lines:
-	 * $model = new Foo(1, 2);
-	 * $model->c = 3;
-	 * $model->init();
-	 * ~~~
-	 *
-	 * @param array $config the object configuration (name-value pairs that will be used to initialize the object)
-	 * @return \yii\base\Object the created object
-	 * @throws Exception if the configuration is invalid.
-	 */
-	public static function newInstance($config = array())
-	{
-		$class = get_called_class();
-
-		if (($n = func_num_args()) > 1) {
-			$args = func_get_args();
-			if ($n === 2) {
-				$object = new $class($args[1]);
-			} elseif ($n === 3) {
-				$object = new $class($args[1], $args[2]);
-			} elseif ($n === 4) {
-				$object = new $class($args[1], $args[2], $args[3]);
-			} else {
-				// remove $config
-				array_shift($args);
-				$r = new \ReflectionClass($class);
-				$object = $r->newInstanceArgs($args);
-			}
-		} else {
-			$object = new $class;
-		}
-
-		if (isset(\Yii::$objectConfig[$class])) {
-			$config = array_merge(\Yii::$objectConfig[$class], $config);
-		}
-
-		foreach ($config as $name => $value) {
-			$object->$name = $value;
-		}
-
-		if ($object instanceof Initable) {
-			$object->init();
-		}
-
-		return $object;
+		return method_exists($this, 'set' . $name) || $checkVar && property_exists($this, $name);
 	}
 }
diff --git a/framework/base/Request.php b/framework/base/Request.php
new file mode 100644
index 0000000..4f3b8b3
--- /dev/null
+++ b/framework/base/Request.php
@@ -0,0 +1,150 @@
+<?php
+/**
+ * Request class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class Request extends ApplicationComponent
+{
+	private $_scriptFile;
+
+	/**
+	 * Initializes the application component.
+	 * This method overrides the parent implementation by preprocessing
+	 * the user request data.
+	 */
+	public function init()
+	{
+	}
+
+	/**
+	 * Returns the relative URL of the entry script.
+	 * The implementation of this method referenced Zend_Controller_Request_Http in Zend Framework.
+	 * @return string the relative URL of the entry script.
+	 */
+	public function getScriptUrl()
+	{
+		if($this->_scriptUrl===null)
+		{
+			$scriptName=basename($_SERVER['SCRIPT_FILENAME']);
+			if(basename($_SERVER['SCRIPT_NAME'])===$scriptName)
+				$this->_scriptUrl=$_SERVER['SCRIPT_NAME'];
+			else if(basename($_SERVER['PHP_SELF'])===$scriptName)
+				$this->_scriptUrl=$_SERVER['PHP_SELF'];
+			else if(isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME'])===$scriptName)
+				$this->_scriptUrl=$_SERVER['ORIG_SCRIPT_NAME'];
+			else if(($pos=strpos($_SERVER['PHP_SELF'],'/'.$scriptName))!==false)
+				$this->_scriptUrl=substr($_SERVER['SCRIPT_NAME'],0,$pos).'/'.$scriptName;
+			else if(isset($_SERVER['DOCUMENT_ROOT']) && strpos($_SERVER['SCRIPT_FILENAME'],$_SERVER['DOCUMENT_ROOT'])===0)
+				$this->_scriptUrl=str_replace('\\','/',str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME']));
+			else
+				throw new Exception(Yii::t('yii','CHttpRequest is unable to determine the entry script URL.'));
+		}
+		return $this->_scriptUrl;
+	}
+
+	/**
+	 * Sets the relative URL for the application entry script.
+	 * This setter is provided in case the entry script URL cannot be determined
+	 * on certain Web servers.
+	 * @param string $value the relative URL for the application entry script.
+	 */
+	public function setScriptUrl($value)
+	{
+		$this->_scriptUrl='/'.trim($value,'/');
+	}
+
+	/**
+	 * Returns whether this is an AJAX (XMLHttpRequest) request.
+	 * @return boolean whether this is an AJAX (XMLHttpRequest) request.
+	 */
+	public function getIsAjaxRequest()
+	{
+		return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH']==='XMLHttpRequest';
+	}
+
+	/**
+	 * Returns whether this is an Adobe Flash or Adobe Flex request.
+	 * @return boolean whether this is an Adobe Flash or Adobe Flex request.
+	 * @since 1.1.11
+	 */
+	public function getIsFlashRequest()
+	{
+		return isset($_SERVER['HTTP_USER_AGENT']) && (stripos($_SERVER['HTTP_USER_AGENT'],'Shockwave')!==false || stripos($_SERVER['HTTP_USER_AGENT'],'Flash')!==false);
+	}
+
+	/**
+	 * Returns the server name.
+	 * @return string server name
+	 */
+	public function getServerName()
+	{
+		return $_SERVER['SERVER_NAME'];
+	}
+
+	/**
+	 * Returns the server port number.
+	 * @return integer server port number
+	 */
+	public function getServerPort()
+	{
+		return $_SERVER['SERVER_PORT'];
+	}
+
+	/**
+	 * Returns the URL referrer, null if not present
+	 * @return string URL referrer, null if not present
+	 */
+	public function getUrlReferrer()
+	{
+		return isset($_SERVER['HTTP_REFERER'])?$_SERVER['HTTP_REFERER']:null;
+	}
+
+	/**
+	 * Returns the user agent, null if not present.
+	 * @return string user agent, null if not present
+	 */
+	public function getUserAgent()
+	{
+		return isset($_SERVER['HTTP_USER_AGENT'])?$_SERVER['HTTP_USER_AGENT']:null;
+	}
+
+	/**
+	 * Returns the user IP address.
+	 * @return string user IP address
+	 */
+	public function getUserHostAddress()
+	{
+		return isset($_SERVER['REMOTE_ADDR'])?$_SERVER['REMOTE_ADDR']:'127.0.0.1';
+	}
+
+	/**
+	 * Returns the user host name, null if it cannot be determined.
+	 * @return string user host name, null if cannot be determined
+	 */
+	public function getUserHost()
+	{
+		return isset($_SERVER['REMOTE_HOST'])?$_SERVER['REMOTE_HOST']:null;
+	}
+
+	/**
+	 * Returns entry script file path.
+	 * @return string entry script file path (processed w/ realpath())
+	 */
+	public function getScriptFile()
+	{
+		if($this->_scriptFile!==null)
+			return $this->_scriptFile;
+		else
+			return $this->_scriptFile=realpath($_SERVER['SCRIPT_FILENAME']);
+	}
+}
diff --git a/framework/base/Response.php b/framework/base/Response.php
new file mode 100644
index 0000000..c15d108
--- /dev/null
+++ b/framework/base/Response.php
@@ -0,0 +1,20 @@
+<?php
+/**
+ * Response and CCookieCollection class file.
+ *
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2012 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * Response encapsulates the $_SERVER variable and resolves its inconsistency among different Web servers.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class Response extends ApplicationComponent
+{
+}
diff --git a/framework/base/Theme.php b/framework/base/Theme.php
index c539a76..464602b 100644
--- a/framework/base/Theme.php
+++ b/framework/base/Theme.php
@@ -25,12 +25,12 @@ class Theme extends ApplicationComponent
 		if ($this->basePath !== null) {
 			$this->basePath = \Yii::getAlias($this->basePath, true);
 		} else {
-			throw new Exception("Theme.basePath must be set.");
+			throw new BadConfigException("Theme.basePath must be set.");
 		}
 		if ($this->baseUrl !== null) {
 			$this->baseUrl = \Yii::getAlias($this->baseUrl, true);
 		} else {
-			throw new Exception("Theme.baseUrl must be set.");
+			throw new BadConfigException("Theme.baseUrl must be set.");
 		}
 	}
 
diff --git a/framework/base/Vector.php b/framework/base/Vector.php
index 5a685e0..f6c7aca 100644
--- a/framework/base/Vector.php
+++ b/framework/base/Vector.php
@@ -99,7 +99,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 	 * Returns the item at the specified index.
 	 * @param integer $index the index of the item
 	 * @return mixed the item at the index
-	 * @throws Exception if the index is out of range
+	 * @throws BadParamException if the index is out of range
 	 */
 	public function itemAt($index)
 	{
@@ -108,7 +108,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 		} elseif ($index >= 0 && $index < $this->_c) { // in case the value is null
 			return $this->_d[$index];
 		} else {
-			throw new Exception('Index out of range: ' . $index);
+			throw new BadParamException('Index out of range: ' . $index);
 		}
 	}
 
@@ -130,7 +130,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 	 * one step towards the end.
 	 * @param integer $index the specified position.
 	 * @param mixed $item new item to be inserted into the vector
-	 * @throws Exception if the index specified is out of range, or the vector is read-only.
+	 * @throws BadParamException if the index specified is out of range, or the vector is read-only.
 	 */
 	public function insertAt($index, $item)
 	{
@@ -140,7 +140,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 			array_splice($this->_d, $index, 0, array($item));
 			$this->_c++;
 		} else {
-			throw new Exception('Index out of range: ' . $index);
+			throw new BadParamException('Index out of range: ' . $index);
 		}
 	}
 
@@ -167,7 +167,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 	 * Removes an item at the specified position.
 	 * @param integer $index the index of the item to be removed.
 	 * @return mixed the removed item.
-	 * @throws Exception if the index is out of range, or the vector is read only.
+	 * @throws BadParamException if the index is out of range, or the vector is read only.
 	 */
 	public function removeAt($index)
 	{
@@ -181,7 +181,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 				return $item;
 			}
 		} else {
-			throw new Exception('Index out of range: ' . $index);
+			throw new BadParamException('Index out of range: ' . $index);
 		}
 	}
 
@@ -240,7 +240,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 	 * Copies iterable data into the vector.
 	 * Note, existing data in the vector will be cleared first.
 	 * @param mixed $data the data to be copied from, must be an array or an object implementing `Traversable`
-	 * @throws Exception if data is neither an array nor an object implementing `Traversable`.
+	 * @throws BadParamException if data is neither an array nor an object implementing `Traversable`.
 	 */
 	public function copyFrom($data)
 	{
@@ -255,7 +255,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 				$this->add($item);
 			}
 		} else {
-			throw new Exception('Data must be either an array or an object implementing Traversable.');
+			throw new BadParamException('Data must be either an array or an object implementing Traversable.');
 		}
 	}
 
@@ -263,7 +263,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 	 * Merges iterable data into the vector.
 	 * New items will be appended to the end of the existing items.
 	 * @param array|\Traversable $data the data to be merged with. It must be an array or object implementing Traversable
-	 * @throws Exception if data is neither an array nor an object implementing `Traversable`.
+	 * @throws BadParamException if data is neither an array nor an object implementing `Traversable`.
 	 */
 	public function mergeWith($data)
 	{
@@ -275,7 +275,7 @@ class Vector extends Object implements \IteratorAggregate, \ArrayAccess, \Counta
 				$this->add($item);
 			}
 		} else {
-			throw new Exception('The data to be merged with must be an array or an object implementing Traversable.');
+			throw new BadParamException('The data to be merged with must be an array or an object implementing Traversable.');
 		}
 	}
 
diff --git a/framework/base/View.php b/framework/base/View.php
index 802855e..f2a06e2 100644
--- a/framework/base/View.php
+++ b/framework/base/View.php
@@ -103,7 +103,7 @@ class View extends Component
 	 * @param array $params the parameters that should be made available in the view. The PHP function `extract()`
 	 * will be called on this variable to extract the variables from this parameter.
 	 * @return string the rendering result
-	 * @throws Exception if the view file cannot be found
+	 * @throws BadParamException if the view file cannot be found
 	 */
 	public function renderPartial($view, $params = array())
 	{
@@ -111,7 +111,7 @@ class View extends Component
 		if ($file !== false) {
 			return $this->renderFile($file, $params);
 		} else {
-			throw new Exception("Unable to find the view file for view '$view'.");
+			throw new BadParamException("Unable to find the view file for view '$view'.");
 		}
 	}
 
@@ -170,6 +170,7 @@ class View extends Component
 	 */
 	public function endWidget()
 	{
+		/** @var $widget Widget */
 		if (($widget = array_pop($this->widgetStack)) !== null) {
 			$widget->run();
 			return $widget;
@@ -413,7 +414,7 @@ class View extends Component
 	 * The themed layout file will be returned if theme is enabled and the theme contains such a layout file.
 	 *
 	 * @return string|boolean the layout file path, or false if the context does not need layout.
-	 * @throws Exception if the layout file cannot be found
+	 * @throws BadParamException if the layout file cannot be found
 	 */
 	public function findLayoutFile()
 	{
@@ -451,7 +452,7 @@ class View extends Component
 			}
 		}
 		if ($file === false || !is_file($file)) {
-			throw new Exception("Unable to find the layout file for layout '{$module->layout}' (specified by " . get_class($module) . ")");
+			throw new BadParamException("Unable to find the layout file for layout '{$module->layout}' (specified by " . get_class($module) . ")");
 		} elseif ($this->localizeView) {
 			return FileHelper::localize($file, $this->language, $this->sourceLanguage);
 		} else {
diff --git a/framework/base/Widget.php b/framework/base/Widget.php
index c95ea7f..23efd37 100644
--- a/framework/base/Widget.php
+++ b/framework/base/Widget.php
@@ -15,7 +15,7 @@ namespace yii\base;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-class Widget extends Component implements Initable
+class Widget extends Component
 {
 	/**
 	 * @var Widget|Controller the owner/creator of this widget. It could be either a widget or a controller.
@@ -62,13 +62,6 @@ class Widget extends Component implements Initable
 	}
 
 	/**
-	 * Initializes the widget.
-	 */
-	public function init()
-	{
-	}
-
-	/**
 	 * Executes the widget.
 	 */
 	public function run()
diff --git a/framework/caching/MemCache.php b/framework/caching/MemCache.php
index 5366584..1a19738 100644
--- a/framework/caching/MemCache.php
+++ b/framework/caching/MemCache.php
@@ -138,7 +138,7 @@ class MemCache extends Cache
 	public function setServers($config)
 	{
 		foreach ($config as $c) {
-			$this->_servers[] = MemCacheServer::newInstance($c);
+			$this->_servers[] = new MemCacheServer($c);
 		}
 	}
 
diff --git a/framework/db/ar/ActiveMetaData.php b/framework/db/ar/ActiveMetaData.php
index 41391bb..74ce6cb 100644
--- a/framework/db/ar/ActiveMetaData.php
+++ b/framework/db/ar/ActiveMetaData.php
@@ -89,7 +89,7 @@ class ActiveMetaData
 			if (is_string($config)) {
 				$config = array('on' => $config);
 			}
-			$relation = ActiveRelation::newInstance($config);
+			$relation = new ActiveRelation($config);
 			$relation->name = $matches[1];
 			$modelClass = $matches[2];
 			if (strpos($modelClass, '\\') !== false) {
diff --git a/framework/db/ar/ActiveRecord.php b/framework/db/ar/ActiveRecord.php
index bdd8756..544d7a7 100644
--- a/framework/db/ar/ActiveRecord.php
+++ b/framework/db/ar/ActiveRecord.php
@@ -1034,7 +1034,8 @@ abstract class ActiveRecord extends Model
 	 */
 	public static function instantiate($row)
 	{
-		return static::newInstance();
+		$class = get_called_class();
+		return new $class;
 	}
 
 	/**
diff --git a/framework/db/dao/Connection.php b/framework/db/dao/Connection.php
index 7b0f5f7..85f29b4 100644
--- a/framework/db/dao/Connection.php
+++ b/framework/db/dao/Connection.php
@@ -25,10 +25,10 @@ use yii\db\Exception;
  * the DB connection:
  *
  * ~~~
- * $connection = \yii\db\dao\Connection::newInstance(array(
- * 	'dsn' => $dsn,
- * 	'username' => $username,
- * 	'password' => $password,
+ * $connection = new \yii\db\dao\Connection(array(
+ *     'dsn' => $dsn,
+ *     'username' => $username,
+ *     'password' => $password,
  * ));
  * $connection->active = true;  // same as: $connection->open();
  * ~~~
diff --git a/framework/logging/Target.php b/framework/logging/Target.php
index 377528b..1a1979a 100644
--- a/framework/logging/Target.php
+++ b/framework/logging/Target.php
@@ -23,7 +23,7 @@ namespace yii\logging;
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
-abstract class Target extends \yii\base\Component implements \yii\base\Initable
+abstract class Target extends \yii\base\Component
 {
 	/**
 	 * @var boolean whether to enable this log target. Defaults to true.
@@ -90,15 +90,6 @@ abstract class Target extends \yii\base\Component implements \yii\base\Initable
 	abstract public function exportMessages($final);
 
 	/**
-	 * Initializes this component.
-	 * This method is invoked after the component is created and its property values are
-	 * initialized.
-	 */
-	public function init()
-	{
-	}
-
-	/**
 	 * Processes the given log messages.
 	 * This method will filter the given messages with [[levels]] and [[categories]].
 	 * And if requested, it will also export the filtering result to specific medium (e.g. email).
diff --git a/framework/yiic.php b/framework/yiic.php
index a1e2a24..a6b205d 100644
--- a/framework/yiic.php
+++ b/framework/yiic.php
@@ -18,4 +18,5 @@ $config = array(
 $id = 'yiic';
 $basePath = __DIR__ . '/console';
 
-yii\console\Application::newInstance($config, $id, $basePath)->run();
\ No newline at end of file
+$application = new yii\console\Application($id, $basePath, $config);
+$application->run();