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;

如果不存在 Strategy 元素，则不会抛出异常..这是为什么?我们不应该得到一个例外吗?

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.

如果你需要验证文档，你需要定义一个XML Schema，并将其注入到Marshaller或Unmarshaller中，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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