works and doesn't exit suddenly

.idea/compiler.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="15" />
+    <bytecodeTargetLevel target="9" />
   </component>
 </project>

src/main/java/ro/mihai/GreetingsService.java

@@ -11,7 +11,7 @@ import com.twitter.util.Future;
 public class GreetingsService extends Service<Request, Response> {
     @Override
     public Future<Response> apply(Request request) {
-        String greeting = "Hello " + request.getParam("name");
+        String greeting = "Hello1 " + request.getParam("name");
         Reader<Buf> reader = Reader.fromBuf(new Buf.ByteArray(greeting.getBytes(), 0, greeting.length()));
         return Future.value(Response.apply(request.version(), Status.Ok(), reader));
     }

src/main/java/ro/mihai/Main.java

@@ -1,10 +1,14 @@
 package ro.mihai;
 
 import com.twitter.finagle.Http;
-
 public class Main {
     public static void main(String []args) {
         GreetingsService sServ = new GreetingsService();
-        Http.serve(":8080", sServ);
+        Http.server().withAdmissionControl()
+                .concurrencyLimit(10, 0)
+                .serve(":8080", sServ);
+        System.out.println("seems that this is async .... so we wait for connections");
+        while( true) ;
     }
+
 }