JAXB required = true似乎不需要 [英] JAXB required=true doesn't seem to require

问题描述

我们有这个JAXB注释：

We have this JAXB annotation:

 @XmlElement(name = "Strategy", required = true)
 protected List<Strategy> strategy;

如果没有策略元素，没有异常被抛出..为什么会这样？我们不应该得到异常吗？

If there are no Strategy elements present, no exception is thrown.. why is this? Shouldn't we get an exception?

推荐答案

JAXB参考实现不使用此属性进行验证，它纯粹用于文档目的。

The JAXB reference implementation doesn't use this attribute for validation, it's purely there for documentation purposes.

如果需要验证文档，则需要定义XML Schema，并将其注入 Marshaller 或 Unmarshaller ，使用 SchemaFactory 。

If you need to validate the documents, you need to define an XML Schema, and inject it into the Marshaller or Unmarshaller, using SchemaFactory.

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