是否可以在Java 8中调试Lambdas [英] Is it possible to debug Lambdas in Java 8

问题描述

我刚刚开始玩Java 8 Lambdas，我注意到我无法在NetBeans IDE中调试它们。如果我尝试附加一个断点到以下代码，我得到一个可变的断点，这绝对不是我想要的：

I just started playing with Java 8 Lambdas and I noticed that I can't debug them in the NetBeans IDE. If I try to attach a breakpoint to the following code I get a variable breakpoint which is definately not what I wanted:

private EventListener myListener (Event event) ->
{
  command1;
  command2; // Set Breakpoint here
  command3;
};

NetBeans将调试器附加到myListener变量，但我无法进入EventListener本身我看不到其中发生了什么。

NetBeans attaches the debugger at the "myListener" variable but I can't step into the EventListener itself so I can't see what is happening inside it.

是否有调试信息丢失，这是NetBeans中缺少的功能，还是无法调试Lambdas Java？

Is there debugging information missing, is this a missing feature in NetBeans or is it not at all possible to debug Lambdas in Java?

推荐答案

它在Eclipse中适用于我。例如：

It works for me in Eclipse. For example:

public class Foo {

    private static final Runnable r1 = () -> {
        System.out.println("r1a");
        System.out.println("r1b");
    };

    public static void main(String[] args) {
        Runnable r2 = () -> {
            System.out.println("r2a");
            System.out.println("r2b");
        };

        r1.run();
        r2.run();
    }
}

我可以在$ $中的各个行添加断点c $ c> r1 和 r2 ，并按步骤等进行适当的打击。

I can add breakpoints to individual lines within both r1 and r2, and they get hit appropriately, with stepping etc.

如果我只在 run（）调用中放置一个断点，那么我也可以将进入相关的lambda表达式。

If I put a breakpoint on just the run() calls, I can step into the relevant lambda expression too.

所以这听起来像是所有的调试信息至少可以可用。

So it sounds like all the debug information at least can be available.

编辑：显然上面的工作在Netbeans - 我建议你尝试检查你可以让它工作。

Apparently the above works in Netbeans too - I suggest you try it to check that you can get that working.

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