重新引发InvocationTargetException目标异常 [英] Re-throw an InvocationTargetException target exception

问题描述

如何重新引发InvocationTargetException的目标异常.我有一个使用反射的方法来在我的一个类中调用invoke()方法.但是，如果我的代码中引发了Exception，则我不必担心InvocationTargetException，而只需要目标异常.这是一个示例:

How does one re-throw the target exception of an InvocationTargetException. I have a method which uses reflection to call the invoke() method within one of my classes. However, if there is an Exception thrown within my code, I am not concerned about the InvocationTargetException and only want the target exception. Here is an example:

public static Object executeViewComponent(String name, Component c,
        HttpServletRequest request) throws Exception {

    try {
        return c.getClass()
                .getMethod(c.getMetaData().getMethod(), HttpServletRequest.class)
                .invoke(c, request);
    } catch (InvocationTargetException e) {
        // throw the target exception here
    }
}

我面临的主要问题是调用throw e.getCause();.不抛出异常，而是抛出Throwable.也许我处理方法不正确?

The primary problem I am facing is that calling throw e.getCause(); doesn't throw an Exception but rather throws a Throwable. Perhaps I am approaching this incorrectly?

推荐答案

catch (InvocationTargetException e) {
    if (e.getCause() instanceof Exception) {
        throw (Exception) e.getCause();
    }
    else {
        // decide what you want to do. The cause is probably an error, or it's null.
    }
}

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