在嵌套异常中检查某个异常类型是否是原因（原因等）的最佳方式？ [英] Best way to check whether a certain exception type was the cause (of a cause, etc ...) in a nested exception?

问题描述

我正在写一些JUnit测试，验证是否抛出类型为 MyCustomException 的异常。但是，这个异常被包含在其他异常中，例如多次。在InvocationTargetException中，它又被包装在一个RuntimeException中。

确定MyCustomException是否导致我实际捕获的异常的最佳方法是什么？我想做这样的事情（见下划线）：

  
 try {
 doSomethingPotentiallyExceptional（） ; 
 fail（预期出现异常）; 
} catch（RuntimeException e）{
 if（！e。 wasCausedBy （MyCustomException.class）
 fail（例如）; 
} 
  

我想避免调用 getCause（）一些层深层次，类似的丑陋的工作环境，有更好的方法吗？

（显然， Spring有 NestedRuntimeException.contains（Class ），这是我想要的 - 但是我没有使用Spring。）

关闭：
OK ，我想真的没有得到一个实用程序的方法:-)感谢所有回复的人！

解决方案

你为什么要避免 getCause 。当然，您可以自己写一个执行任务的方法，例如：

  public static boolean isCause（
 class<？extends Throwable> expected，
 Throwable exc 
）{
 return expected.isInstance（exc）|| （
 exc！= null&&&&             
} 
  

I am writing some JUnit tests that verify that an exception of type MyCustomException is thrown. However, this exception is wrapped in other exceptions a number of times, e.g. in an InvocationTargetException, which in turn is wrapped in a RuntimeException.

What's the best way to determine whether MyCustomException somehow caused the exception that I actually catch? I would like to do something like this (see underlined):

try {
    doSomethingPotentiallyExceptional();
    fail("Expected an exception.");
} catch (RuntimeException e) {
     if (!e.wasCausedBy(MyCustomException.class)
        fail("Expected a different kind of exception.");
}

I would like to avoid calling getCause() a few "layers" deep, and similar ugly work-arounds. Is there a nicer way?

(Apparently, Spring has NestedRuntimeException.contains(Class), which does what I want - but I'm not using Spring.)

CLOSED: OK, I guess there's really no getting around a utility method :-) Thanks to everybody who replied!

解决方案

Why would you want to avoid getCause. You can, of course, write yourself a method to perform the task, something like:

public static boolean isCause(
    Class<? extends Throwable> expected,
    Throwable exc
) {
   return expected.isInstance(exc) || (
       exc != null && isCause(expected, exc.getCause())
   );
}

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