CXF JAXB 数据绑定问题 - java.io.Serializable 是一个接口，而 JAXB 无法处理接口答案

【问题标题】：CXF JAXB Databinding issue - java.io.Serializable is an interface, and JAXB can't handle interfacesCXF JAXB 数据绑定问题 - java.io.Serializable 是一个接口，而 JAXB 无法处理接口
【发布时间】：2012-05-29 21:26:45
【问题描述】：

我有以下代码

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class SamplePojo {
    private Serializable id;
    private String name;

    public Serializable getId() {
        return id;
    }
    public void setId(Serializable id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
    this.name = name;
    }
}

还有一个简单的网络服务接口，

@WebService
public interface SampleManagementService {
    @WebMethod
    @WebResult(name = "samplePojo")
    public SamplePojo update(@WebParam(name = "samplePojo") SamplePojo pojo) throws SampleException;
}

我正在使用 CXF-2.3.6 和 org.apache.cxf.tools.java2ws.JavaToWS 从 java 代码生成 WSDL。当我运行命令时

java2ws -verbose -o sample.wsdl -wsdl -frontend jaxws com.test.cxf.webservice.sample.SampleManagementService

我遇到了以下异常

cxfJavaToWSDL:
     [java] java2ws -verbose -o sample.wsdl -wsdl -frontend jaxws com.test.cxf.webservice.sample.SampleManagementService
     [java] java2ws - Apache CXF 2.3.6
     [java]
     [java] May 29, 2012 4:51:48 PM org.apache.cxf.service.factory.ReflectionServiceFactoryBean buildServiceFromClass
     [java] INFO: Creating Service {http://sample.webservice.cxf.test.com/}SampleManagementServiceService from class com.test.cxf.webservice.sample.SampleManagementService
     [java] Error: java.lang.RuntimeException: org.apache.cxf.service.factory.ServiceConstructionException
     [java]
     [java] java.lang.RuntimeException: org.apache.cxf.service.factory.ServiceConstructionException
     [java]     at org.apache.cxf.frontend.AbstractServiceFactory.createService(AbstractServiceFactory.java:80)
     [java]     at org.apache.cxf.tools.java2wsdl.processor.JavaToWSDLProcessor.process(JavaToWSDLProcessor.java:101)
     [java]     at org.apache.cxf.tools.java2ws.JavaToWSContainer.processWSDL(JavaToWSContainer.java:110)
     [java]     at org.apache.cxf.tools.java2ws.JavaToWSContainer.execute(JavaToWSContainer.java:75)
     [java]     at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:103)
     [java]     at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:58)
     [java]     at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:40)
     [java]     at org.apache.cxf.tools.java2ws.JavaToWS.run(JavaToWS.java:77)
     [java]     at org.apache.cxf.tools.java2ws.JavaToWS.main(JavaToWS.java:45)
     [java] Caused by: org.apache.cxf.service.factory.ServiceConstructionException
     [java]     at org.apache.cxf.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:341)
     [java]     at org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)
     [java]     at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:442)
     [java]     at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.buildServiceFromClass(JaxWsServiceFactoryBean.java:682)
     [java]     at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:505)
     [java]     at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:242)
     [java]     at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.create(JaxWsServiceFactoryBean.java:202)
     [java]     at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)
     [java]     at org.apache.cxf.frontend.AbstractServiceFactory.createService(AbstractServiceFactory.java:78)
     [java]     ... 8 more
     [java] Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 3 counts of IllegalAnnotationExceptions
     [java] Adapter com.test.cxf.webservice.sample.SerializableAdapter is not applicable to the field type java.io.Serializable.
     [java]     this problem is related to the following location:
     [java]             at @javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter(type=class javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter$DEFAULT, value=class com.test.cxf.webservice.sample.SerializableAdapter)
     [java]             at private java.io.Serializable com.test.cxf.webservice.sample.SamplePojo.id
     [java]             at com.test.cxf.webservice.sample.SamplePojo
     [java]             at private com.test.cxf.webservice.sample.SamplePojo com.test.cxf.webservice.sample.jaxws_asm.Update.samplePojo
     [java]             at com.test.cxf.webservice.sample.jaxws_asm.Update
     [java] java.io.Serializable is an interface, and JAXB can't handle interfaces.
     [java]     this problem is related to the following location:
     [java]             at java.io.Serializable
     [java]             at private java.io.Serializable com.test.cxf.webservice.sample.SamplePojo.id
     [java]             at com.test.cxf.webservice.sample.SamplePojo
     [java]             at private com.test.cxf.webservice.sample.SamplePojo com.test.cxf.webservice.sample.jaxws_asm.Update.samplePojo
     [java]             at com.test.cxf.webservice.sample.jaxws_asm.Update
     [java] java.io.Serializable does not have a no-arg default constructor.
     [java]     this problem is related to the following location:
     [java]             at java.io.Serializable
     [java]             at private java.io.Serializable com.test.cxf.webservice.sample.SamplePojo.id
     [java]             at com.test.cxf.webservice.sample.SamplePojo
     [java]             at private com.test.cxf.webservice.sample.SamplePojo com.test.cxf.webservice.sample.jaxws_asm.Update.samplePojo
     [java]             at com.test.cxf.webservice.sample.jaxws_asm.Update
     [java]
     [java]     at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:102)
     [java]     at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:472)
     [java]     at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
     [java]     at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1140)

我尝试创建SerializableAdapter，但没有运气。谁能告诉我处理Serializable参数传递的正确方法是什么？

【问题讨论】：

标签： jaxb cxf

【解决方案1】：

那是行不通的。 Serializable 不能被 JAXB 处理，这是 CXF 在处理 Java 和 XML 之间的实际转换时使用的绑定引擎。

要修复，您必须决定是否需要 XML 中的 id 属性。如果你不这样做，只需用@XmlTransient 标记getter 就可以了。但是，如果您确实想要一个 id，那么您必须决定如何将它映射到一个字符串（如果该字段是一个具体的类而不是任何旧的类，这会简单得多任意可序列化的东西）。如果您与String 之间的转换效果很好，您只需将您的属性更改为字符串属性或制作假属性：

@XmlRootElement
@XmlAccessorType(XmlAccessType.NONE) // Note the change here too!
public class SamplePojo {
    private Serializable id;
    private String name;

    @XmlTransient
    public Serializable getId() {
        return id;
    }
    public void setId(Serializable id) {
        this.id = id;
    }

    @XmlElement(name = "id")
    public String getStringId() {
        return id.toString(); // Or whatever...
    }
    public void setStringId(String id) {
        this.id = IdFactory.getIdFromString(id); // Or whatever...
    }

    @XmlElement
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

【讨论】：

Donal，我尝试了您建议的方式，但我们的问题是 Serializable id 并不总是与 String 映射。它可以是 Long、Integer、String、Date 或任何自定义 Serializable 类型。我被困在这个问题上，到目前为止我没有任何解决方法。我将 id 修改为 java.lang.Object 但生成的模式返回值为 org.apache.xerces.dom.ElementNSImpl 类型，我真的不知道要转换为哪个对象。感谢您提供有关此问题的任何帮助。

【解决方案2】：

您可以为此用例使用XmlAdapter。您需要指定一个可映射的值类型（以下示例中的String），然后提供必要的转换逻辑：

SerializableAdapter

package forum10798310;

import java.io.Serializable; import javax.xml.bind.annotation.adapters.XmlAdapter;

public class SerializableAdapter extends XmlAdapter<String, Serializable>{

    @Override
    public Serializable unmarshal(String v) throws Exception {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String marshal(Serializable v) throws Exception {
        // TODO Auto-generated method stub
        return null;
    }

}

SamplePojo

@XmlJavaTypeAdapter 注解用于链接XmlAdapter。

package forum10798310;

import java.io.Serializable;

import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class SamplePojo {
    @XmlJavaTypeAdapter(SerializableAdapter.class)
    private Serializable id;
    private String name;

    public Serializable getId() {
        return id;
    }
    public void setId(Serializable id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
    this.name = name;
    }
}

【讨论】：

Blaise，你的答案在这种情况下不起作用，我仍然得到同样的例外。