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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * AppserverIo\Routlt\Results\RawResult  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * NOTICE OF LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This source file is subject to the Open Software License (OSL 3.0)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * that is available through the world-wide-web at this URL:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * http://opensource.org/licenses/osl-3.0.php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * PHP version 5  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Tim Wagner <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright  2015 TechDivision GmbH <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license    http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link       http://github.com/appserver-io/routlt  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link       http://www.appserver.io  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace AppserverIo\Routlt\Results;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Routlt\Annotations\Result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Routlt\Util\EncodingAware;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Routlt\Util\ValidationAware;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Routlt\Util\DefaultHeadersAware;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Psr\Servlet\ServletRequestInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppserverIo\Psr\Servlet\ServletResponseInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Result implementation that supports action based default headers and encoding.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Tim Wagner <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright  2015 TechDivision GmbH <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license    http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link       http://github.com/appserver-io/routlt  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link       http://www.appserver.io  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @Result(shared=false)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class RawResult extends AbstractResult  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Processes an action result by dispatching the configured servlet.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \AppserverIo\Psr\Servlet\ServletRequestInterface  $servletRequest  The request instance  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \AppserverIo\Psr\Servlet\ServletResponseInterface $servletResponse The response sent back to the client  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function process(ServletRequestInterface $servletRequest, ServletResponseInterface $servletResponse)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        // load the action instance  | 
            
            
                                                        
            
                                    
            
            
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                        $action = $this->getAction();  | 
            
            
                                                        
            
                                    
            
            
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                        // add the actions default headers to the response  | 
            
            
                                                        
            
                                    
            
            
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                        if ($action instanceof DefaultHeadersAware && $action->hasDefaultHeaders()) { | 
            
            
                                                        
            
                                    
            
            
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                            foreach ($action->getDefaultHeaders() as $name => $value) { | 
            
            
                                                        
            
                                    
            
            
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                                // if not, set the default header  | 
            
            
                                                        
            
                                    
            
            
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                                $servletResponse->addHeader($name, $value);  | 
            
                            
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                            }  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // query whether the action contains errors or not  | 
            
            
                                                        
            
                                    
            
            
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                        if ($action instanceof ValidationAware && $action->hasErrors()) { | 
            
            
                                                        
            
                                    
            
            
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                            $bodyContent = $action->getErrors();  | 
            
            
                                                        
            
                                    
            
            
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                        } else { | 
            
            
                                                        
            
                                    
            
            
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                            $bodyContent = $action->getAttribute($this->getResult());  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // query whether the action requires content encoding or not  | 
            
            
                                                        
            
                                    
            
            
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                        if ($action instanceof EncodingAware && !empty($bodyContent)) { | 
            
            
                                                        
            
                                    
            
            
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                            $bodyContent = $action->encode($bodyContent);  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // set the encoded body content  | 
            
            
                                                        
            
                                    
            
            
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                        $servletResponse->appendBodyStream($bodyContent);  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: