为什么我的Class.forName()抛出的异常不是ClassNotFoundException，而是RuntimeException?

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文章详细介绍了Java类加载器Axis2重写findClass方法导致Class.forName()抛出RuntimeException的原因，解释了Axis2如何通过替换类名路径并尝试加载类，并在失败时抛出特定类型的异常。

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为什么我的Class.forName()抛出的异常不是ClassNotFoundException，而是RuntimeException?
时间:2007-06-18 www.jubao163.com 来源: 不详

所属分类：Java J2SE / 基础类
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try {
Class c = Class.forName("aaaaa");
c.newInstance();
} catch (Exception e) {
if (e instanceof ClassNotFoundException)
System.out.println("ClassNotFoundException");
else if (e instanceof RuntimeException)
System.out.println("RuntimeException");
}

----------------------------------------------------------------------

绝对是ClassNotFoundException

你真的执行过吗

--------------------------------------------------------

度过ClassNotFoundException

--------------------------------------------------------

试过了ClassNotFoundException

--------------------------------------------------------

哎，终于知道原因了！我用的是Axis2包，而Axis2重写了类加载器ClassLoader类中的findClass方法，如下：
protected Class findClass(String name) throws ClassNotFoundException {
Class clazz;
try {
clazz = super.findClass(name);
} catch (ClassNotFoundException e) {
byte raw[];
try {
String completeFileName = name;
/**
* Replacing org.apache. -> org/apache/...
*/
completeFileName = completeFileName.replace(’.’, ’/’).concat(".class");
raw = getBytes(completeFileName);
if (raw == null) {
throw new ClassNotFoundException("Class Not found : " + name);
}
} catch (Exception ex) {
// TODO: This, or throw new ClassNotFoundException?
throw new RuntimeException(ex);
}
clazz = defineClass(name, raw, 0, raw.length);
}
return clazz;
}