bug symfony#17389 [Routing] Fixed correct class name in thrown exception (fixes symfony#17388) (robinvdvleuten)

This PR was merged into the 2.3 branch.

Discussion
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[Routing] Fixed correct class name in thrown exception (fixes symfony#17388)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#17388
| License       | MIT
| Doc PR        |

This fixes the thrown exception. Instead of the complete file contents, the class name is used in the exception message.

Commits
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c847feb Fixed correct class name in thrown exception

Author: fabpot

src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php

@@ -120,7 +120,7 @@ public function load($class, $type = null)
 
         $class = new \ReflectionClass($class);
         if ($class->isAbstract()) {
-            throw new \InvalidArgumentException(sprintf('Annotations from class "%s" cannot be read as it is abstract.', $class));
+            throw new \InvalidArgumentException(sprintf('Annotations from class "%s" cannot be read as it is abstract.', $class->getName()));
         }
 
         if ($annot = $this->reader->getClassAnnotation($class, $this->routeAnnotationClass)) {