无法捕捉的 ChuckNorrisException

问题描述

是否有可能在 Java 中构造一段代码来生成假设的 java.lang.ChuckNorrisException 无法捕获?

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

想到的想法是使用拦截器或面向方面的编程.

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

推荐答案

这个我没试过，所以不知道 JVM 会限制这样的事情，但也许你可以编译抛出 ChuckNorrisException 的代码，但在运行时提供 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:

实际上，如果您禁用字节码验证器，您就可以使用它！(-Xverify:none)

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

更新 3:

对于那些在家关注的人，这里是完整的脚本:

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

创建以下类:

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.

注释掉extends RuntimeException"并重新编译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.

无需验证即可运行:

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

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