diff --git a/tools/sandbox/bootstrap.php b/tools/sandbox/bootstrap.php
index 0e7120544..5b97b9412 100644
--- a/tools/sandbox/bootstrap.php
+++ b/tools/sandbox/bootstrap.php
@@ -1,26 +1,32 @@
 <?php
 
-use Doctrine\Common\Cache\ApcCache;
+use Doctrine\Common\Cache;
 use Doctrine\ORM\EntityManager;
 
-$loader = require __DIR__ . '/../../vendor/autoload.php';
-
-// Set up class loading. You could use different autoloaders, provided by your favorite framework,
+// Path to composer autoloader. You can use different provided by your favorite framework,
 // if you want to.
+$loaderPath = __DIR__ . '/../../vendor/autoload.php';
+if(!is_readable($loaderPath)){
+    throw new LogicException('Run php composer.phar install at first');
+}
+$loader = require $loaderPath;
+
+// Set up class loading.
 $loader->add('Entities', __DIR__);
 $loader->add('Proxies', __DIR__);
 
+$debug = true;
 $config = new \Doctrine\ORM\Configuration();
 
 // Set up Metadata Drivers
 $driverImpl = $config->newDefaultAnnotationDriver(array(__DIR__ . "/Entities"));
 $config->setMetadataDriverImpl($driverImpl);
 
-// Set up caches
-$cache = new ApcCache;
+// Set up caches, depending on $debug variable.
+// You can use another variable to define which one of the cache systems you gonna use.
+$cache = $debug ? new Cache\ArrayCache : new Cache\ApcCache;
 $config->setMetadataCacheImpl($cache);
 $config->setQueryCacheImpl($cache);
-$config->setMetadataCacheImpl(new \Doctrine\Common\Cache\ArrayCache);
 
 // Proxy configuration
 $config->setProxyDir(__DIR__ . '/Proxies');