来自Webservice的JAXB类编组错误

Question

我有一些wsimport生成的JAXB类

wsimport -d src/main/java -keep -extension
  -p my.package
  http://www.OpenLigaDB.de/Webservices/Sportsdata.asmx?WSDL

我将演示这个类的问题(我自己只添加了@XmlRootElement):

package my.package;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "Sport", propOrder = {"sportsID","sportsName"})
@XmlRootElement(name = "sport")   //Added by myself
public class Sport
{
    protected int sportsID;
    protected String sportsName;

    public int getSportsID() {return sportsID;}
    public void setSportsID(int value) {this.sportsID = value;}

    public String getSportsName() {return sportsName;}
    public void setSportsName(String value) {this.sportsName = value;}
}

直接实例化和编组工作正常(例1)

Sport sport = new Sport();
sport.setSportsID(1);
sport.setSportsName("test");

JAXBContext jc = JAXBContext.newInstance(Sport.class);
jc.createMarshaller().marshal(sport,System.out);

现在让我们在webservice调用中创建对象:

SportsdataSoap s = new Sportsdata().getSportsdataSoap();
ArrayOfSport sports = s.getAvailSports();

for(Sport sport : sports.getSport())
{
    JAXBContext jc = JAXBContext.newInstance(Sport.class);
    jc.createMarshaller().marshal(sport,System.out);
}

然后我得到了这个例外:

Exception in thread "main" java.lang.ClassCastException: my.package.Sport$JaxbAccessorF_sportsID cannot be cast to com.sun.xml.bind.v2.runtime.reflect.Accessor
    at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.instanciate(OptimizedAccessorFactory.java:199)
    at com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(OptimizedAccessorFactory.java:191)
    at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.optimize(Accessor.java:282)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:94)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:128)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:183)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:526)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:341)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1158)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:140)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:202)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:363)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522)
    at my.package.TestOpenLiga.testDisciplines(TestOpenLiga.java:48)
    at my.package.TestOpenLiga.main(TestOpenLiga.java:130)

怎么处理这个？谢谢你,托尔.

更新2如果我修改Example1到此,我得到相同的错误

SportsdataSoap s = new Sportsdata().getSportsdataSoap();

Sport sport = new Sport();
sport.setSportsID(1);
sport.setSportsName("test");

JAXBContext jc = JAXBContext.newInstance(Sport.class);
jc.createMarshaller().marshal(sport,System.out);

更新2体育的XML结构

<Sport>
  <sportsID>int</sportsID>
  <sportsName>string</sportsName>
</Sport>

Answer 1

我不确定这是否是发生这种情况的唯一原因，但这是我遇到并解决的一个问题，检查您的 Java 认可的目录并删除任何重复的 jaxb-impl.jar。即使使用 webservice-api.jar 也可能发生这种情况。希望这可以帮助。