类加载器的命名空间

public class Parent {

    private Object son;

    public Object getSon(){
        return new Son();
    }
    public Object setSon(Object son){
        this.son = son;
        return this.son;
    }
}  
public class Son {
}

/**
     * 父加载器加载不了,子加载器所加载的类，
     * 父加载器加载Parent
     * 子加载器加载son
     * Parent#getSon 方法里 new Son()对象.//报错,找不到Son的类定义.
     */


    @Test
    public void testParentCanntFindSon(){
        CustomClassLoader01 customClassLoader01 = new CustomClassLoader01(ClassLoader.getSystemClassLoader());
        try {
            Class<?> classParent = customClassLoader01.loadClass("com.rock.Parent");
            System.out.println("classParent:" + classParent.getClassLoader());
            Class<?> classSon = customClassLoader01.loadClass("com.rock.Son");
            System.out.println("classSon:" + classSon.getClassLoader());
            Object objParent = classParent.newInstance();

            Object objSon = classSon.newInstance();
            
            Method setSon = classParent.getMethod("setSon",Object.class);
            Object resultSon = setSon.invoke(objParent, objSon);
            System.out.println(resultSon.getClass());
            System.out.println(resultSon.getClass().getClassLoader());

            try {
                Method getSon = classParent.getMethod("getSon");
                Object invoke = getSon.invoke(objParent);
                System.out.println(invoke.getClass().getClassLoader());
            }catch (Exception exp){
                //java.lang.NoClassDefFoundError: com/rock/Son
                exp.printStackTrace();
            }
        }catch (Exception exp){
            exp.printStackTrace();
        }
    }

public class Man {
    private Man father;
    public void setFather(Object obj){
        father = (Man)obj;
    }
}

 @Test
    public void testSifferentNamespaceClass(){
        CustomClassLoader01 customClassLoader01 = new CustomClassLoader01(ClassLoader.getSystemClassLoader());
        CustomClassLoader01 customClassLoader02 = new CustomClassLoader01(ClassLoader.getSystemClassLoader());
        try {
            Class<?> aClass1 = customClassLoader01.loadClass("com.rock.Man");
            System.out.println("class1 : " + aClass1.getClassLoader());
            System.out.println("class1 : " + aClass1.);

            Class<?> aClass2 = customClassLoader02.loadClass("com.rock.Man");
            System.out.println("class2 : " + aClass1.getClassLoader());
            System.out.println("class2 : " + aClass2);
            Object man1 = aClass1.newInstance();
            Object man2 = aClass2.newInstance();
            Method setFather = aClass1.getMethod("setFather", Object.class);
            setFather.invoke(man1,man2);


        }catch (Exception exp){
            exp.printStackTrace();
        }
    }

class1 : com.rock.classLoader.CustomClassLoader01@1f28c152
class1 : 2006034581
class2 : com.rock.classLoader.CustomClassLoader01@1f28c152
class2 : 488044861
...
Caused by: java.lang.ClassCastException: com.rock.Man cannot be cast to com.rock.Man
    at com.rock.Man.setFather(Man.java:6)
    ... 27 more