我有以下代码
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "udt_TextType", propOrder = { "value" })
@XmlSeeAlso({ RoadTypeCodeTypeType.class })
public class UdtTextType {
@XmlValue
@XmlJavaTypeAdapter(NormalizedStringAdapter.class)
@XmlSchemaType(name = "normalizedString")
protected String value;
/**
* Gets the value of the value property.
*
* @return possible object is {@link String }
*
*/
public String getValue() {
return value;
}
/**
* Sets the value of the value property.
*
* @param value
* allowed object is {@link String }
*
*/
public void setValue(String value) {
this.value = value;
}
当我试图编组这个对象时：
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "AdresseCompleteType", propOrder = { "inHouseMail", "buildingName", "buildingNumber", "blockName", "roadType",
"streetName", "postcode", "cityName", "lineFive" })
public class AdresseCompleteType {
@XmlElement(name = "InHouseMail")
protected UdtTextType inHouseMail;
@XmlElement(name = "BuildingName")
protected UdtTextType buildingName;
@XmlElement(name = "BuildingNumber")
protected UdtTextType buildingNumber;
...
我有以下错误： 对象必须在其@XmlValue字段中具有一些值
为什么我会收到此错误？
com.sun.xml.internal.bind.api.AccessorException: Object must have some value in its @XmlValue field: fr.company.jaxb.UdtTextType@17f2dd8] at
fr.company.Service.launchXML(Service.java:303) at
fr.company.Service.launchZIP(Service.java:370) at
fr.company.MainTest.testGenerationZip(MainTest.java:17) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57))
谢谢！
答案 0 :(得分：2)
以下说明了您获得例外的原因：
以下是展示问题的模型的简化版本：
<强> UdtTextType
此类有一个用@XmlValue注释的字段：
import javax.xml.bind.annotation.*;
@XmlAccessorType(XmlAccessType.FIELD)
public class UdtTextType {
@XmlValue
protected String value;
public void setValue(String value) {
this.value = value;
}
}
AdreseCompleteType
需要注意的重要一点是，inHouseMail字段是一种具有@XmlValue映射的类型。
import javax.xml.bind.annotation.*;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class AdreseCompleteType {
@XmlElement(name = "InHouseMail")
protected UdtTextType inHouseMail;
public void setInHouseMail(UdtTextType inHouseMail) {
this.inHouseMail = inHouseMail;
}
}
让我们检查可能从对象模型中产生的不同XML表示。
inHouseMail属性为null AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(null);
在XML表示中，inHouseMail字段应该为null我不包括生成的XML中的那个元素。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<adreseCompleteType/>
inHouseMail属性已设置且UdtTextType具有值UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue("Hello World");
AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);
由于设置了inHouseMail字段，我们会得到InHouseMail元素，因为填充的value字段也会输出。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<adreseCompleteType>
<InHouseMail>Hello World</InHouseMail>
</adreseCompleteType>
inHouseMail属性已设置且UdtTextType具有空字符串值UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue("");
AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);
由于inHouseMail字段已设置，我们会获得InHouseMail元素，因为其value字段将填充为空String，并将其作为空元素输出。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<adreseCompleteType>
<InHouseMail></InHouseMail>
</adreseCompleteType>
inHouseMail已设置属性且UdtTextType的值为null UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue(null);
AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);
问题是这个XML应该是什么样的。它不能是＃3之类的空元素，因为JAXB（和XML）不将null表示为空元素。它也不能表示为缺少InHouseMail元素，因为它会与场景＃1冲突。因此抛出以下异常：
Exception in thread "main" javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.internal.SAXException2: Object must have some value in its @XmlValue field: forum28411016.UdtTextType@f7ca0f5
com.sun.xml.internal.bind.api.AccessorException: Object must have some value in its @XmlValue field: forum28411016.UdtTextType@f7ca0f5]
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 forum28411016.Demo.main(Demo.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: com.sun.istack.internal.SAXException2: Object must have some value in its @XmlValue field: forum28411016.UdtTextType@f7ca0f5
com.sun.xml.internal.bind.api.AccessorException: Object must have some value in its @XmlValue field: forum28411016.UdtTextType@f7ca0f5
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:235)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:250)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:347)
at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:582)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:325)
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)
... 8 more
Caused by: com.sun.xml.internal.bind.api.AccessorException: Object must have some value in its @XmlValue field: forum28411016.UdtTextType@f7ca0f5
at com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl$TransducerImpl.writeLeafElement(RuntimeClassInfoImpl.java:395)
at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.writeLeafElement(TransducedAccessor.java:239)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementLeafProperty.serializeBody(SingleElementLeafProperty.java:114)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:343)
... 12 more