[EventDispatcher] [EventDispatcher] Throw exception when listener method cannot be resolved

Author: nikophil

DependencyInjection/RegisterListenersPass.php

@@ -115,7 +115,11 @@ public function process(ContainerBuilder $container)
                     ], function ($matches) { return strtoupper($matches[0]); }, $event['event']);
                     $event['method'] = preg_replace('/[^a-z0-9]/i', '', $event['method']);
 
-                    if (null !== ($class = $container->getDefinition($id)->getClass()) && ($r = $container->getReflectionClass($class, false)) && !$r->hasMethod($event['method']) && $r->hasMethod('__invoke')) {
+                    if (null !== ($class = $container->getDefinition($id)->getClass()) && ($r = $container->getReflectionClass($class, false)) && !$r->hasMethod($event['method'])) {
+                        if (!$r->hasMethod('__invoke')) {
+                            throw new InvalidArgumentException(sprintf('None of the "%s" or "__invoke" methods exist for the service "foo". Please define the "method" attribute on "kernel.event_listener" tags.', $event['method'], $id, $this->listenerTag));
+                        }
+                        
                         $event['method'] = '__invoke';
                     }
                 }

Tests/DependencyInjection/RegisterListenersPassTest.php

@@ -200,10 +200,20 @@ public function testEventSubscriberUnresolvableClassName()
     public function testInvokableEventListener()
     {
         $container = new ContainerBuilder();
-        $container->register('foo', \stdClass::class)->addTag('kernel.event_listener', ['event' => 'foo.bar']);
+        $container->setParameter('event_dispatcher.event_aliases', [AliasedEvent::class => 'aliased_event']);
+
+        $container->register('foo', \get_class(new class() {
+            public function onFooBar()
+            {
+            }
+        }))->addTag('kernel.event_listener', ['event' => 'foo.bar']);
         $container->register('bar', InvokableListenerService::class)->addTag('kernel.event_listener', ['event' => 'foo.bar']);
         $container->register('baz', InvokableListenerService::class)->addTag('kernel.event_listener', ['event' => 'event']);
-        $container->register('zar', \stdClass::class)->addTag('kernel.event_listener', ['event' => 'foo.bar_zar']);
+        $container->register('zar', \get_class(new class() {
+            public function onFooBarZar()
+            {
+            }
+        }))->addTag('kernel.event_listener', ['event' => 'foo.bar_zar']);
         $container->register('event_dispatcher', \stdClass::class);
 
         $registerListenersPass = new RegisterListenersPass();
@@ -247,6 +257,20 @@ public function testInvokableEventListener()
         $this->assertEquals($expectedCalls, $definition->getMethodCalls());
     }
 
+    public function testItThrowsAnExceptionIfTagIsMissingMethodAndClassHasNoValidMethod()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('None of the "onFooBar" or "__invoke" methods exist for the service "foo". Please define the "method" attribute on "kernel.event_listener" tags.');
+
+        $container = new ContainerBuilder();
+
+        $container->register('foo', \stdClass::class)->addTag('kernel.event_listener', ['event' => 'foo.bar']);
+        $container->register('event_dispatcher', \stdClass::class);
+
+        $registerListenersPass = new RegisterListenersPass();
+        $registerListenersPass->process($container);
+    }
+
     /**
      * @requires PHP 8
      */