把Java对象映射成XML文档，这是Java对象持久化的一种新思路。在XML.com的一篇文章里，作者对四种主要的Java-XML映射工具进行了全面的比较：
Breeze XML Binder, a tool produced by Breeze Factor Castor, an open source project under ExoLab JAXB Reference Implementation, created by SUN XGen, a tool produced by Commerce One.比较的标准主要有以下几条：（1）对XML大纲（schema）特性的支持程度；（2）生成Java代码的可用性；（3）Java-XML转换（以及反向转换）的工作情况。
测试的结果如下。可以看到，Sun的JAXB参考实现竟然有着绝佳的表现，不论在性能还是特性集方面，都仅次于XGen，名列第二。这让我对JAXB又多了几分信心。
| Feature | Breeze | Castor | JAXB RI | XGen |
| Customization Disallowed | ||||
| Package Name Mapped from Namespace | 1 | |||
| Automatic Unmarshaling | ||||
| Open Source | 2 | |||
| Free of Charge | ||||
| Schema Location Roundtrippable | ||||
| Schema Location Settable | 3 | 3 | ||
| Schemas without a Target Namespace Supported | ||||
| Instance Validation on Unmarshal | 4 | |||
| Constraint Check of Values on Set | 5 | |||
| Value Validation when Marshaling | 5 | |||
| Code Generation Command Line Tool Interface | ||||
| Code Generation Programmatic Interface | ||||
| Code Generation GUI Interface | ||||
| Generated Code Implements Generic Interfaces | 6 |
1 -- Mapped if no other package name is specified.2-- JAXB will be available as an open source project in the upcoming future. More information can be found at http://jaxb.dev.java.net/.3 -- Only on marshaller class.4 -- Off by default.5 -- Some values validated.6 -- Interfaces based on functionality instead of type of XML Schema construct.
