Java 8 Eclipse Luna 4.4 GWT 2.8错误：Lambda表达式仅在源代码级别1.8或以上才允许使用

Question

public class MyBox extends DialogBox {

private HandlerRegistration resizeHandler = null;
private static final int TIME_GAP = 500;
private Timer resizeTimer = new Timer() {
    @Override public void run() {
        center();
    }
};

@Override
protected void onLoad() {
    addResizeListener();
}

@Override
protected void onUnload() {
    resizeTimer.cancel();
    resizeHandler.removeHandler();
}

private void addResizeListener() {
    this.resizeHandler = Window.addResizeHandler(
            (ResizeEvent event)->{resizeTimer.schedule(TIME_GAP);});
}

[ERROR] Line 117: Lambda expressions are allowed only at source level 1.8 or above
     [ERROR] Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly

null

还是让我犯了错误。有什么想法吗？多谢！

Answer 1

错误在这里：

private void addResizeListener() {
this.resizeHandler = Window.addResizeHandler((ResizeEvent event)->
         {resizeTimer.schedule(TIME_GAP);});}

通常，它应该用红色突出显示它，并且根本不允许编译。但是，不知何故，它设法忽略了它并开始编译。lambda函数的正确形式是：

private void addResizeListener() {
        this.resizeHandler = Window.addResizeHandler(event -> 
        {resizeTimer.schedule(TIME_GAP);});}

丢弃所有最新的更改和git pull从最后一点解决了这个问题。我不明白为什么以前没有用红色突出显示它。