Github user chtyim commented on a diff in the pull request:
    --- Diff: 
    @@ -181,19 +190,130 @@ public Reader getInput() throws IOException {
    -  @Nullable
       private EventHandler createEventHandler(TwillSpecification twillSpec) 
throws ClassNotFoundException {
         // Should be able to load by this class ClassLoader, as they packaged 
in the same jar.
         EventHandlerSpecification handlerSpec = twillSpec.getEventHandler();
         if (handlerSpec == null) {
    -      return null;
    +      // if no handler is specified, return an EventHandler with no-op
    +      return new EventHandler() {};
         Class<?> handlerClass = 
                                     "Class {} does not implements {}",
    -    return Instances.newInstance((Class<? extends EventHandler>) 
    +    final EventHandler delegate = Instances.newInstance((Class<? extends 
EventHandler>) handlerClass);
    +    // wrap all calls to the delegate EventHandler methods except 
initialize so that all errors will be caught
    +    return new EventHandler() {
    +      private boolean initialized;
    +      @Override
    +      public void initialize(EventHandlerContext context) {
    +        delegate.initialize(context);
    +        initialized = true;
    --- End diff --
    Since any exception thrown from `initialize` will terminate the app, I 
think we don't need this, right?

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