尝试取消编组xml时的类强制转换异常？ [英] Class Cast Exception when trying to unmarshall xml?

问题描述

尝试通过此处的类投射异常：

Trying to get past a class cast exception here:

FooClass fooClass = (FooClass ) unmarshaller.unmarshal(inputStream);

抛出此异常：

java.lang.ClassCastException: javax.xml.bind.JAXBElement

I不明白这一点 - 因为这个类是由xjc.bat工具生成的 - 它生成的类我根本没有改变 - 所以这里应该没有转换问题 - unmarshaller应该真的给我一个类可以投射到FooClass。

I don't understand this - as the class was generated by the xjc.bat tool - and the classes it generated I have not altered at all - so there should be no casting problems here - the unmarshaller should really be giving me back a class that CAN be cast to FooClass.

关于我做错了什么想法？

Any ideas as to what I am doing wrong?

推荐答案

FooClass 是否有 XmlRootElement 注释？如果没有，请尝试：

Does FooClass have the XmlRootElement annotation? If not, try:

Source source = new StreamSource(inputStream);
JAXBElement<FooClass> root = unmarshaller.unmarshal(source, FooClass.class);
FooClass foo = root.getValue();

这是基于非官方的JAXB指南。

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