關(guān)于Java的問題，一般通過將堆棧作為關(guān)鍵詞到搜索引擎搜索就有結(jié)果了。:)
這次遇到的問題有點意思，程序也很簡單，所以就在提問下。
以下代碼有什么問題呢？CallerSensitive annotation是什么意思？

import sun.reflect.Reflection;

public class CalleeApp {

    public void call() {
        Class<?> clazz = Reflection.getCallerClass();
        System.out.println("Hello " + clazz);
    }
}

public class CallerApp {

    public static void main(String[] args) {
        CalleeApp app = new CalleeApp();
        Caller1 c1 = new Caller1();
        c1.run(app);
    }

    static class Caller1 {
        void run(CalleeApp calleeApp) {
            if (calleeApp == null) {
                throw new IllegalArgumentException("callee can not be null");
            }
            calleeApp.call();
        }
    }

}

錯誤的堆棧

Exception in thread "main" java.lang.InternalError: CallerSensitive annotation expected at frame 1
    at sun.reflect.Reflection.getCallerClass(Native Method)
    at com.honey.caller.CalleeApp.call(CalleeApp.java:8)
    at com.honey.caller.CallerApp$Caller1.run(CallerApp.java:18)
    at com.honey.caller.CallerApp.main(CallerApp.java:8)

Java版本：

Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp
openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-8u141-b15-3-b15)
OpenJDK 64-Bit Server VM (build 25.141-b15, mixed mode)

UPDATE 2018年04月11日22:07:12
我覺得這篇文章是對這個問題的很好的解答，為什么不建議調(diào)用sun包，如何通過其他方法確定調(diào)用者