java - JAXB 解码错误

Question

我正在编写的 Java 应用程序中使用 JAXB。我已成功地将 OCI 架构编译为类，并且能够将 AuthenticationRequest 类型编码为 XML(在 OCIMessage 内)，将其发送并获取响应。然而，当我尝试将响应解码到 OCIMessage 中时，它会默默失败。这是我的测试类(class)的内容:

package com.some.domain.ignore;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.helpers.DefaultValidationEventHandler;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.stream.StreamSource;

import com.some.domain.oci.OCIMessage;
import com.some.domain.oci.ObjectFactory;
import com.some.domain.schema.AuthenticationRequest;
import com.some.domain.schema.AuthenticationResponse;

public class JavaTest {
    private final static String HOST = "some.host.com";
    private final static int PORT = 2208;
    private final static String USER = "SOME_USER";

    private final static String SESSION = Long.toString(System.currentTimeMillis());
    private static Socket sock;
    private static OutputStream out;
    private static Marshaller marshaller;
    private static Unmarshaller unmarshaller;
    private static JAXBContext context;
    private static ObjectFactory factory;

    public static void main(String[] args) {
        try {
            runIt();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void runIt() throws XMLStreamException, FactoryConfigurationError, IOException, JAXBException {
        sock = new Socket(HOST, PORT);
        out = sock.getOutputStream();

        AuthenticationRequest request = new AuthenticationRequest();
        request.setUserId(USER);

        factory = new ObjectFactory();
        OCIMessage message = new OCIMessage();
        message.setSessionId(SESSION);
        message.setProtocol("OCI");
        message.getCommand().add(request);
        JAXBElement<OCIMessage> element = factory.createBroadsoftDocument(message);

        context = JAXBContext.newInstance(ObjectFactory.class);
        marshaller = context.createMarshaller();
        unmarshaller = context.createUnmarshaller();
        marshaller.marshal(element, out);

        unmarshaller.setEventHandler(new DefaultValidationEventHandler());
        StreamSource s = new StreamSource(sock.getInputStream());
        JAXBElement<OCIMessage> doc = unmarshaller.unmarshal(s, OCIMessage.class);
        OCIMessage response = doc.getValue();
    }
}

实际的 XML 响应是这样的:

<BroadsoftDocument protocol="OCI" xmlns="C" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<sessionId xmlns="">1329428955041</sessionId>
<command echo="" xsi:type="AuthenticationResponse" xmlns="">
<userId>SOME_USER</userId>
<nonce>1329428959587</nonce>
<passwordAlgorithm>MD5</passwordAlgorithm></command>
</BroadsoftDocument>

解码尝试失败，没有任何错误，这是非常没有帮助的。就好像 JAXB 解码代码中的某些内容正在吞噬异常，即使我显式指定了解码 ValidationEventHandler。

关于为什么会发生这种情况有什么想法吗？如果需要，我可以提供更多代码或信息。

为了进一步引用，这里是 OCIMessage 类:

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2012.02.13 at 03:15:18 PM EST 
//


package com.some.domain.oci.schema;

import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlSchemaType;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.CollapsedStringAdapter;
import javax.xml.bind.annotation.adapters.NormalizedStringAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;


/**
 * 
 *         A message contains a list of requests or responses. The server processes all the requests
 *         and returns a message with a corresponding list of responses.
 *       
 * 
 * <p>Java class for OCIMessage complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="OCIMessage">
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;choice>
 *           &lt;element name="sessionId" type="{http://www.w3.org/2001/XMLSchema}normalizedString"/>
 *           &lt;element name="userId" type="{http://www.w3.org/2001/XMLSchema}token"/>
 *           &lt;element name="phoneNumber" type="{http://www.w3.org/2001/XMLSchema}token"/>
 *         &lt;/choice>
 *         &lt;element name="command" type="{C}OCICommand" maxOccurs="15"/>
 *       &lt;/sequence>
 *       &lt;attribute name="protocol" use="required">
 *         &lt;simpleType>
 *           &lt;restriction base="{http://www.w3.org/2001/XMLSchema}NMTOKEN">
 *             &lt;enumeration value="OCI"/>
 *             &lt;enumeration value="NSOCI"/>
 *           &lt;/restriction>
 *         &lt;/simpleType>
 *       &lt;/attribute>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "OCIMessage", propOrder = {
    "sessionId",
    "userId",
    "phoneNumber",
    "command"
})
public class OCIMessage {

    @XmlJavaTypeAdapter(NormalizedStringAdapter.class)
    @XmlSchemaType(name = "normalizedString")
    protected String sessionId;
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    @XmlSchemaType(name = "token")
    protected String userId;
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    @XmlSchemaType(name = "token")
    protected String phoneNumber;
    @XmlElement(required = true)
    protected List<OCICommand> command;
    @XmlAttribute(name = "protocol", required = true)
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    protected String protocol;

    /**
     * Gets the value of the sessionId property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getSessionId() {
        return sessionId;
    }

    /**
     * Sets the value of the sessionId property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setSessionId(String value) {
        this.sessionId = value;
    }

    /**
     * Gets the value of the userId property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getUserId() {
        return userId;
    }

    /**
     * Sets the value of the userId property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setUserId(String value) {
        this.userId = value;
    }

    /**
     * Gets the value of the phoneNumber property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getPhoneNumber() {
        return phoneNumber;
    }

    /**
     * Sets the value of the phoneNumber property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setPhoneNumber(String value) {
        this.phoneNumber = value;
    }

    /**
     * Gets the value of the command property.
     * 
     * <p>
     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a <CODE>set</CODE> method for the command property.
     * 
     * <p>
     * For example, to add a new item, do as follows:
     * <pre>
     *    getCommand().add(newItem);
     * </pre>
     * 
     * 
     * <p>
     * Objects of the following type(s) are allowed in the list
     * {@link OCICommand }
     * 
     * 
     */
    public List<OCICommand> getCommand() {
        if (command == null) {
            command = new ArrayList<OCICommand>();
        }
        return this.command;
    }

    /**
     * Gets the value of the protocol property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getProtocol() {
        return protocol;
    }

    /**
     * Sets the value of the protocol property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setProtocol(String value) {
        this.protocol = value;
    }

}

最后，这是 ObjectFactory 的内容，它负责通过 createBroadsoftDocument 方法创建 BroadsoftDocument:

//
// This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.2.4 
// See <a href="http://java.sun.com/xml/jaxb">http://java.sun.com/xml/jaxb</a> 
// Any modifications to this file will be lost upon recompilation of the source schema. 
// Generated on: 2012.02.13 at 03:15:18 PM EST 
//


package com.some.domain.oci;

import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.XmlElementDecl;
import javax.xml.bind.annotation.XmlRegistry;
import javax.xml.namespace.QName;


/**
 * This object contains factory methods for each 
 * Java content interface and Java element interface 
 * generated in the c package. 
 * <p>An ObjectFactory allows you to programatically 
 * construct new instances of the Java representation 
 * for XML content. The Java representation of XML 
 * content can consist of schema derived interfaces 
 * and classes representing the binding of schema 
 * type definitions, element declarations and model 
 * groups.  Factory methods for each of these are 
 * provided in this class.
 * 
 */
@XmlRegistry
public class ObjectFactory {

    private final static QName _BroadsoftDocument_QNAME = new QName("C", "BroadsoftDocument");

    /**
     * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: c
     * 
     */
    public ObjectFactory() {
    }

    /**
     * Create an instance of {@link OCIMessage }
     * 
     */
    public OCIMessage createOCIMessage() {
        return new OCIMessage();
    }

    /**
     * Create an instance of {@link SuccessResponse }
     * 
     */
    public SuccessResponse createSuccessResponse() {
        return new SuccessResponse();
    }

    /**
     * Create an instance of {@link OCITableRow }
     * 
     */
    public OCITableRow createOCITableRow() {
        return new OCITableRow();
    }

    /**
     * Create an instance of {@link ErrorResponse }
     * 
     */
    public ErrorResponse createErrorResponse() {
        return new ErrorResponse();
    }

    /**
     * Create an instance of {@link OCITable }
     * 
     */
    public OCITable createOCITable() {
        return new OCITable();
    }

    /**
     * Create an instance of {@link JAXBElement }{@code <}{@link OCIMessage }{@code >}}
     * 
     */
    @XmlElementDecl(namespace = "C", name = "BroadsoftDocument")
    public JAXBElement<OCIMessage> createBroadsoftDocument(OCIMessage value) {
        return new JAXBElement<OCIMessage>(_BroadsoftDocument_QNAME, OCIMessage.class, null, value);
    }

}

Answer 1

看起来像映射错误:响应 XML 文档包含 sessionId 元素，并且未为其准备 AuthenticationResponse 类型的映射。如果您发布类(class)(包括映射注释)，我们可以为您提供更多帮助。