bytecode enhancement on handling returned Result failure on HelloWorld demo

[greenlaw110]

The working code is:

    @GetAction("/greeting")
    public Result greeting(String who, int age) {
        return render(who, age);
    }

As I update it as

    @GetAction("/greeting")
    public void greeting(String who, int age) {
        render(who, age);
    }

It raises the follow error:

java.lang.VerifyError: Operand stack overflow
Exception Details:
  Location:
    act/fsa/helloworld/HelloWorldApp.greeting(Ljava/lang/String;I)V @10: ldc
  Reason:
    Exceeded max stack size.
  Current Frame:
    bci: @10
    flags: { }
    locals: { 'act/fsa/helloworld/HelloWorldApp', 'java/lang/String', integer }
    stack: { '[Ljava/lang/Object;', '[Ljava/lang/Object;', integer, 'act/app/AppContext' }
  Bytecode:
    0000000: 05bd 0004 5903 2ab4 002a 1255 1cb8 005b
    0000010: b600 5f12 612b b600 5f12 63b6 0067 572b
    0000020: 5359 041c b800 5b53 b800 6bbf          

        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:274)
        at org.osgl._.classForName(_.java:4586)
        at act.handler.builtin.controller.impl.ReflectedHandlerInvoker.<init>(ReflectedHandlerInvoker.java:52)
        at act.handler.builtin.controller.impl.ReflectedHandlerInvoker.createControllerAction(ReflectedHandlerInvoker.java:206)
        at act.Act$Mode.createRequestHandler(Act.java:70)
        at act.handler.builtin.controller.RequestHandlerProxy.generateHandlers(RequestHandlerProxy.java:216)
        at act.handler.builtin.controller.RequestHandlerProxy.ensureAgentsReady(RequestHandlerProxy.java:193)
        at act.handler.builtin.controller.RequestHandlerProxy.handle(RequestHandlerProxy.java:117)
        at act.handler.DelegateRequestHandler.handle(DelegateRequestHandler.java:18)
        at act.route.Router$ContextualHandler.handle(Router.java:514)
        at act.xio.NetworkClient.handle(NetworkClient.java:40)
        at act.xio.undertow.ActHttpHandler.handleRequest(ActHttpHandler.java:27)
        at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197)
        at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:181)
        at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:108)
        at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:130)
        at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:81)
        at io.undertow.server.protocol.http.HttpOpenListener.handleEvent(HttpOpenListener.java:45)
        at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
        at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:291)
        at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286)
        at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
        at org.xnio.nio.NioTcpServerHandle.handleReady(NioTcpServerHandle.java:53)
        at org.xnio.nio.WorkerThread.run(WorkerThread.java:539)