使用Web服务时出现UnmarshalException

Question

我有一个基于许多实体类的Web服务。其中一个是下面的节目

@Entity
@Table(name = "users")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
@NamedQuery(name = "Users.findByUserName", query = "SELECT u FROM Users u WHERE u.userName = :userName"),
@NamedQuery(name = "Users.findByUserPassword", query = "SELECT u FROM Users u WHERE u.userPassword = :userPassword")})

public class Users implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@Basic(optional = false)
@Column(name = "user_name")
private String userName;

@Basic(optional = false)
@Column(name = "user_password")
private String userPassword;

@JoinColumn(name = "user_category_id", referencedColumnName = "category_id")
@ManyToOne(optional = false)
private UserCategory userCategoryId;

@OneToMany(cascade = CascadeType.ALL, mappedBy = "userName")
private List<UserRecord> userRecordList;

public Users() {
}

public Users(String userName) {
    this.userName = userName;
}

public Users(String userName, String userPassword) {
    this.userName = userName;
    this.userPassword = userPassword;
}

public String getUserName() {
    return userName;
}

public void setUserName(String userName) {
    this.userName = userName;
}

public String getUserPassword() {
    return userPassword;
}

public void setUserPassword(String userPassword) {
    this.userPassword = userPassword;
}

public UserCategory getUserCategoryId() {
    return userCategoryId;
}

public void setUserCategoryId(UserCategory userCategoryId) {
    this.userCategoryId = userCategoryId;
}

@XmlTransient
public List<UserRecord> getUserRecordList() {
    return userRecordList;
}

public void setUserRecordList(List<UserRecord> userRecordList) {
    this.userRecordList = userRecordList;
}

@Override
public int hashCode() {
    int hash = 0;
    hash += (userName != null ? userName.hashCode() : 0);
    return hash;
}

@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof Users)) {
        return false;
    }
    Users other = (Users) object;
    if ((this.userName == null && other.userName != null) || (this.userName != null && !this.userName.equals(other.userName))) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return userName;
}

 }

我能够成功部署Web服务，然后使用netbeans添加了一个新的Restful Web客户端，创建了以下类

public class Client {
private WebTarget webTarget;
private javax.ws.rs.client.Client client;
private static final String BASE_URI = "http://localhost:31691/ProductionEntitiesService/api";

public Client() {
    client = javax.ws.rs.client.ClientBuilder.newClient();
    webTarget = client.target(BASE_URI).path("entities.users");
}

...
public <T> T find_XML(Class<T> responseType, String id) throws ClientErrorException {
    WebTarget resource = webTarget;
    resource = resource.path(java.text.MessageFormat.format("{0}", new Object[]{id}));
    return resource.request(javax.ws.rs.core.MediaType.APPLICATION_XML).get(responseType);
}


public <T> T findAll_XML(Class<T> responseType) throws ClientErrorException {
    WebTarget resource = webTarget;
    return resource.request(javax.ws.rs.core.MediaType.APPLICATION_XML).get(responseType);
}

public void close() {
    client.close();
}

}

然后这行代码返回了查询的xml结果

result = c.findAll_XML(String.class);

有这种格式

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<userss>
<users>
    <userCategoryId>
        <categoryId>2</categoryId>
        <userCategory>admin</userCategory>
    </userCategoryId>
    <userName>admin</userName>
    <userPassword>d033e22ae348aeb5660fc2140aec35850c4da997</userPassword>
</users>
</userss>

然而，这行代码

List<Users> l = (List<Users>)c.findAll_XML(Users.class);

产生一个异常，这似乎是由围绕xml结果的“userss”标签引起的，我不确定是怎么发生的。

任何人都可以帮我解决这个问题吗？

Exception in thread "AWT-EventQueue-0" javax.ws.rs.BadRequestException: HTTP 400 Bad Request
at org.glassfish.jersey.message.internal.AbstractRootElementJaxbProvider.readFrom(AbstractRootElementJaxbProvider.java:124)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:188)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:134)
at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:988)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:833)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:768)
at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:96)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:740)
at org.glassfish.jersey.client.JerseyInvocation.access$500(JerseyInvocation.java:88)
at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:650)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:421)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:646)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:375)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:275)
at service.Client.findAll_XML(Client.java:83)
at examples.Find.<init>(Find.java:44)
at examples.Find$1.run(Find.java:166)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
 Caused by: javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"userss"). Expected elements are <{}userCategory>,<{}users>
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:681)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:247)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:242)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:109)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1086)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:510)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:492)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:163)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:378)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:604)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3122)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:243)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:214)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:140)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:123)
at org.glassfish.jersey.message.internal.XmlRootElementJaxbProvider.readFrom(XmlRootElementJaxbProvider.java:140)
at org.glassfish.jersey.message.internal.AbstractRootElementJaxbProvider.readFrom(AbstractRootElementJaxbProvider.java:122)
... 33 more