字节好友-java.lang.NoSuchMethodException-正确的defineMethod语法是什么？ [英] Byte Buddy - java.lang.NoSuchMethodException - what is the correct defineMethod syntax?

问题描述

我正在尝试使用Byte Buddy为字段创建一个setter和getter。

I am trying to create a setter and a getter for a field using Byte Buddy.

public class Sample {

    public static void main(String[] args) throws InstantiationException, IllegalAccessException, NoSuchFieldException, SecurityException, NoSuchMethodException {

        Class<?> type = new ByteBuddy()
                .subclass(Object.class)
                .name("domain")
                .defineField("id", int.class, Visibility.PRIVATE)               
                .defineMethod("getId", int.class, Visibility.PUBLIC).intercept(FieldAccessor.ofBeanProperty())
                .make()
                .load(Sample.class.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
                .getLoaded();

        Object o = type.newInstance();
        Field f = o.getClass().getDeclaredField("id");
        f.setAccessible(true);
        System.out.println(o.toString());       
        Method m = o.getClass().getDeclaredMethod("getId", int.class);
        System.out.println(m.getName());
    }
}

在学习页面的访问字段部分在此指出，使用实现创建一个setter和getter很简单 code>定义方法后，然后使用 FieldAccessor.ofBeanProperty（）

In the accessing field section of the learn pages here it is stated that creating a setter and getter is trivial by using an implementation after defining the method and then using FieldAccessor.ofBeanProperty()

Method m = o.getClass（）。getDeclaredMethod（ getId，int.class）; 引发NoSuchMethodException。

The Method m = o.getClass().getDeclaredMethod("getId", int.class); throws the NoSuchMethodException.

什么是

推荐答案

正确的方法调用应该是

Method m = o.getClass().getDeclaredMethod("getId");

int 是返回类型，而您不必在 getDeclaredMethod 调用中指定返回类型-仅参数类型和方法 getId 没有参数。

int is the return type, and you don't have to specify the return type in the getDeclaredMethod call - only the argument types and the method getId has no arguments.

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