Java Web 服务/JAXB - 抽象超类
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Java Web Services/JAXB - Abstract superclass
提问by alex.zherdev
I have a package with JAXB annotated classes with an abstract superclass. I want to use this superclass in web service interface, so I can pass any of subclasses as a parameter. When I do it, an exception is thrown:
我有一个带有 JAXB 注释类和抽象超类的包。我想在 Web 服务接口中使用这个超类，所以我可以将任何子类作为参数传递。当我这样做时，抛出异常：
javax.xml.ws.WebServiceException: javax.xml.bind.UnmarshalException
- with linked exception:
[javax.xml.bind.UnmarshalException: Unable to create an instance of xxx.yyy.ZZZ
- with linked exception:
[java.lang.InstantiationException]]
It is possible to manually marshall/unmarshall & pass parameter as a string, but I would like to avoid it. Any ideas how to do it?
可以手动编组/解组并将参数作为字符串传递，但我想避免它。任何想法如何做到？
采纳答案by Heri
Have you specified the concrete implementation in your web service request? This works fine for me:
您是否在您的 Web 服务请求中指定了具体实现？这对我来说很好用：
Abstract base class:
抽象基类：
@XmlSeeAlso({Foo.class, Bar.class})
public abstract class FooBase
{
...
}
Implementation class:
实现类：
@XmlRootElement(name = "foo")
public class Foo extends FooBase
{
...
}
Web service method:
网络服务方式：
public String getFoo(@WebParam(name = "param") final FooBase foo)
{
...
}
Request:
要求：
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://service.example/">
<soapenv:Header/>
<soapenv:Body>
<ser:getFoo>
<param xsi:type="ser:foo" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
</ser:getFoo>
</soapenv:Body>
</soapenv:Envelope>
回答by Michal Moravcik
I was solving the same issue today. I found EclipseLink MOXy JAXB implementation as working, but there is no separate jar or maven module available (it is only as whole eclipselink.jar, which is huge) Finally I tried the latest JAXB version (2.2.2) and surprisingly it worked well.
我今天正在解决同样的问题。我发现 EclipseLink MOXy JAXB 实现可以工作，但是没有单独的 jar 或 maven 模块可用（它只是整个 eclipselink.jar，这是巨大的）最后我尝试了最新的 JAXB 版本（2.2.2），令人惊讶的是它运行良好.
maven config:
行家配置：
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.2.2</version>
</dependency>
回答by J?rg Pfründer
I had a similar Problem, which the comments above didn't solve. The Blogsposts linked from InstantiationException during JAXB Unmarshalling (abstract base class, with @XmlSeeAlso concrete sub class)were very helpful for me to understand what I was really doing.
我有一个类似的问题，上面的评论没有解决。JAXB Unmarshalling 期间从InstantiationException链接的博客帖子（抽象基类，带有 @XmlSeeAlso 具体子类）对我了解我真正在做什么非常有帮助。
