在IDREF属性中找到JAXB获取对象"",但此对象没有ID

Question

以下是使用SCORM for imsmanifest,xml文件的测试用例.这个XML已经使用了大约5年或更长时间,并且作为标准我不想改变它,除非需要让它工作.

你可以在这里找到xsd文件

错误发生在<organizations default="CYBER4.ORG">和之间<organization identifier="CYBER4.ORG">

在我的项目中,这是pom.xml我的jaxb版本的条目

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.2.11</version>
</dependency>

生成我运行的Java代码(这是xjcUbuntu 14.04 的安装)

$ xjc -version
xjc 2.2.4-2
$ xjc -verbose -p org.cyber4.scorm2004.xml.manifest.imscp imscp_v1p2.xsd

输出生成(除其他外)

public class OrganizationsType {

    @XmlAttribute(name = "default")
    @XmlIDREF
    @XmlSchemaType(name = "IDREF")
    protected Object _default;

}

和

public class OrganizationType {

    @XmlAttribute(name = "identifier", required = true)
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    @XmlID
    @XmlSchemaType(name = "ID")
    protected String identifier;

}

这是测试代码

package org.cyber4.scorm2004.build;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

import org.cyber4.scorm2004.xml.manifest.imscp.ManifestMetadataType;
import org.cyber4.scorm2004.xml.manifest.imscp.ManifestType;
import org.cyber4.scorm2004.xml.manifest.imscp.ObjectFactory;
import org.cyber4.scorm2004.xml.manifest.imscp.OrganizationType;
import org.cyber4.scorm2004.xml.manifest.imscp.OrganizationsType;
import org.cyber4.scorm2004.xml.manifest.imscp.ResourcesType;

//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;

public class TestSCORMBuilder {

    public static void main(String args[]) {

        try {

            ObjectFactory objectFactory = new ObjectFactory(); 

            /*
             *  <metadata />
             */
            ManifestMetadataType metadataType = objectFactory.createManifestMetadataType();

            /*
             *  <organizations default="CYBER4.ORG">
             *      <organization identifier="CYBER4.ORG" /> 
             *  </organizations>
             */

            // https://java.net/jira/browse/JAXB-872
            OrganizationsType organizationsType = objectFactory.createOrganizationsType();
            organizationsType.setDefault("CYBER4.ORG");

            OrganizationType organizationType = objectFactory.createOrganizationType();
            organizationType.setIdentifier("CYBER4.ORG");

            organizationsType.getOrganization().add(organizationType);

            /*
             * <resources />
             */
            ResourcesType resourcesType = objectFactory.createResourcesType();

            /*
             * <manifest>
             * <metadata/ >
             *  <organizations default="CYBER4.ORG">
             *      <organization identifier="CYBER4.ORG" /> 
             *  </organizations>
             * <resources />
             * <manifest>
             */

            ManifestType manifestType = objectFactory.createManifestType();

            manifestType.setMetadata(metadataType);
            manifestType.setOrganizations(organizationsType);
            manifestType.setResources(resourcesType);

            JAXBContext context = JAXBContext.newInstance("org.cyber4.scorm2004.xml.manifest.imscp");

            Marshaller marshaller = context.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.setProperty(Marshaller.JAXB_SCHEMA_LOCATION,
                    "http://www.imsglobal.org/xsd/imscp_v1p1 imscp_v1p1.xsd");

            marshaller.marshal(objectFactory.createManifest(manifestType), System.out);

        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

}

当我运行代码时,我收到此错误

javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.internal.SAXException2: Object "CYBER4.ORG" is found in an IDREF property but this object doesnt have an ID.]
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:311)
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:236)
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:95)
    at org.cyber4.scorm2004.build.TestSCORMBuilder.main(TestSCORMBuilder.java:73)
Caused by: com.sun.istack.internal.SAXException2: Object "CYBER4.ORG" is found in an IDREF property but this object doesnt have an ID.
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:237)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.errorMissingId(XMLSerializer.java:1045)
    at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$IDREFTransducedAccessorImpl.print(TransducedAccessor.java:275)
    at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$IDREFTransducedAccessorImpl.print(TransducedAccessor.java:254)
    at com.sun.xml.internal.bind.v2.runtime.property.AttributeProperty.serializeAttributes(AttributeProperty.java:86)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeAttributes(ClassBeanInfoImpl.java:360)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:678)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:143)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:343)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:685)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:143)
    at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:145)
    at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:115)
    at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:317)
    at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:324)
    at com.sun.xml.internal.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:60)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:483)
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:308)
    ... 3 more

如果我评论第37行

organizationsType.setDefault("CYBER4.ORG");

它生成这个XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<manifest xmlns="http://www.imsglobal.org/xsd/imscp_v1p1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.imsglobal.org/xsd/imscp_v1p1 imscp_v1p1.xsd">
    <metadata/>
    <organizations>
        <organization identifier="CYBER4.ORG"/>
    </organizations>
    <resources/>
</manifest>

但它错过了

 default="CYBER4.ORG"

在<organizations>这是需要imsmanifest.xml有效.

这看起来像这个bug,但我想确定我没有错过任何东西.

Answer 1

default 不应包含要引用的对象的id,而是包含与要引用的对象具有相同id的对象.

尝试替换:

organizationsType.setDefault("CYBER4.ORG");    

用:

OrganizationType o = new OrganizationType()   
o.setIdentifier("CYBER4.ORG");    
organizationsType.setDefault(o);    

如果organizationType已经设置,您也可以尝试:

organizationsType.setDefault(organizationType);