无可争议的ChuckNorrisException [英] Uncatchable ChuckNorrisException

问题描述

是否可以在 Java 中构建一个代码片段，这样就可以产生一个假设 java.lang.ChuckNorrisException uncatchable？

Is it possible to construct a snippet of code in Java that would make a hypothetical java.lang.ChuckNorrisException uncatchable?

想到想到的是使用示例拦截器或面向对象的编程。

Thoughts that came to mind are using for example interceptors or aspect-oriented programming.

推荐答案

我没有尝试过，所以我不知道 JVM 是否会限制这样的事情，但是也许你可以编译引发 ChuckNorrisException 的代码，但是在运行时提供 ChuckNorrisException 的类定义不扩展Throwable 。

I haven't tried this, so I don't know if the JVM would restrict something like this, but maybe you could compile code which throws ChuckNorrisException, but at runtime provide a class definition of ChuckNorrisException which does not extend Throwable.

更新：

它不起作用。它会生成验证器错误：

It doesn't work. It generates a verifier error:

Exception in thread "main" java.lang.VerifyError: (class: TestThrow, method: ma\
in signature: ([Ljava/lang/String;)V) Can only throw Throwable objects
Could not find the main class: TestThrow.  Program will exit.

更新2：

其实你如果你禁用字节码验证器，可以让它工作！ （ -Xverify：none ）

Actually, you can get this to work if you disable the byte code verifier! (-Xverify:none)

更新3：

对于那些在家中的人，以下是完整的脚本：

For those following from home, here is the full script:

创建以下课程：

public class ChuckNorrisException
    extends RuntimeException // <- Comment out this line on second compilation
{
    public ChuckNorrisException() { }
}

public class TestVillain {
    public static void main(String[] args) {
        try {
            throw new ChuckNorrisException();
        }
        catch(Throwable t) {
            System.out.println("Gotcha!");
        }
        finally {
            System.out.println("The end.");
        }
    }
}

编译类：

javac -cp . TestVillain.java ChuckNorrisException.java

运行：

java -cp . TestVillain
Gotcha!
The end.

注释扩展RuntimeException和重新编译 ChuckNorrisException.java ：

Comment out "extends RuntimeException" and recompile ChuckNorrisException.java only :

javac -cp . ChuckNorrisException.java

运行：

java -cp . TestVillain
Exception in thread "main" java.lang.VerifyError: (class: TestVillain, method: main signature: ([Ljava/lang/String;)V) Can only throw Throwable objects
Could not find the main class: TestVillain.  Program will exit.

无验证运行：

java -Xverify:none -cp . TestVillain
The end.
Exception in thread "main"

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