Java Web 服务/JAXB - 抽象超类 [英] Java Web Services/JAXB - Abstract superclass

问题描述

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，所以我可以传递任何子类作为参数.当我这样做时，抛出异常:

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:

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]]

可以手动编组/解组 &将参数作为字符串传递，但我想避免它.任何想法如何做到这一点?

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?

推荐答案

您是否在 Web 服务请求中指定了具体实现?这对我来说很好用:

Have you specified the concrete implementation in your web service request? This works fine for me:

抽象基类:

@XmlSeeAlso({Foo.class, Bar.class})
public abstract class FooBase
{
  ...
}

实现类:

@XmlRootElement(name = "foo")
public class Foo extends FooBase
{
  ...
}

网络服务方法:

public String getFoo(@WebParam(name = "param") final FooBase foo)
{
  ...
}

请求:

<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>

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