[KEYCLOAK-18117] - Unhandled exceptions not releasing worker thread

quarkus/runtime/src/main/java/org/keycloak/provider/quarkus/QuarkusRequestFilter.java

@@ -53,11 +53,10 @@ public class QuarkusRequestFilter extends AbstractRequestFilter implements Handl
                     // we need to close the session before response is sent to the client, otherwise subsequent requests could
                     // not get the latest state because the session from the previous request is still being closed
                     // other methods from Vert.x to add a handler to the response works asynchronously
-                    context.addHeadersEndHandler(event -> close(session));
+                    context.addHeadersEndHandler(createEndHandler(context, promise, session));
                     context.next();
-                    promise.complete();
                 } catch (Throwable cause) {
-                    promise.fail(cause);
+                    context.fail(cause);
                     // re-throw so that the any exception is handled from parent
                     throw new RuntimeException(cause);
                 }
@@ -65,6 +64,18 @@ public class QuarkusRequestFilter extends AbstractRequestFilter implements Handl
         }, false, EMPTY_RESULT);
     }
 
+    private Handler<Void> createEndHandler(RoutingContext context, io.vertx.core.Promise<Object> promise,
+            KeycloakSession session) {
+        return event -> {
+            try {
+                close(session);
+                promise.complete();
+            } catch (Throwable cause) {
+                context.fail(cause);
+            }
+        };
+    }
+
     private void configureContextualData(RoutingContext context, ClientConnection connection, KeycloakSession session) {
         // quarkus-resteasy changed and clears the context map before dispatching
         // need to push keycloak contextual objects into the routing context for retrieving it later