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

问题描述

我有一个带有JAXB注释类的包，带有一个抽象超类。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，会抛出异常：

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。有什么想法吗？

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？这适用于我：

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
{
  ...
}

实施类：

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

Web服务方法：

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

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>

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