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Java 对象的@XmlValue字段中必须有一些值

java jaxb

Java 对象的@XmlValue字段中必须有一些值,java,jaxb,Java,Jaxb,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(

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;
}
当我试图马歇尔这个对象：

@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： 对象的@XmlValue字段中必须有一些值

为什么会出现这个错误

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

以下内容解释了出现异常的原因：

Java模型 下面是模型的简化版本，演示了问题：

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;
    }

}
XML表示 让我们检查对象模型中可能出现的不同XML表示

#1-
inHouseMail
属性为
null
在XML表示中，
inHouseMail
字段应为
null
my，而不包括结果XML中的该元素
#2-
inHouseMail
属性已设置，并且
UdtTextType
具有一个值 由于设置了
inHouseMail
字段，我们得到了
inHouseMail
元素，并且由于填充了它的
值
字段，因此也输出了该元素


你好，世界
#3-
inHouseMail
属性已设置，并且
UdtTextType
具有空字符串值 由于设置了
inHouseMail
字段，我们得到了
inHouseMail
元素，并且由于其
值
字段填充为空
字符串
，作为空元素输出
#4-
inHouseMail
属性已设置，并且
UdtTextType
具有
null
值 问题是这个XML应该是什么样子。它不能是像#3这样的空元素，因为JAXB（和XML）不将null表示为空元素。它也不能表示为缺少的
InHouseMail
元素，因为这将与场景1冲突。因此会引发以下异常：

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
谢谢你，布莱斯，我改了名字。这是堆栈：
code
com.sun.xml.internal.bind.api.AccessorException:Object的@XmlValue字段中必须有一些值：fr.company.jaxb。UdtTextType@17f2dd8]位于fr.company.Service.launchXML（Service.java:303）处，位于fr.company.Service.launchZIP（Service.java:370）处，位于fr.company.MainTest.testGenerationZip（MainTest.java:17）在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57））
code
我认为这是因为我在adrescompletetype中有一些为null的@xmlement。我该怎么做才能使JAXB不考虑它们呢？好吧，现在我更明白了。我添加了一些测试来检查UdtTextType是否有空值，并且是否有效。非常感谢。 
UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue("Hello World");

AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);

UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue("");

AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);

UdtTextType udtTextType = new UdtTextType();
udtTextType.setValue(null);

AdreseCompleteType adreseCompleteType = new AdreseCompleteType();
adreseCompleteType.setInHouseMail(udtTextType);

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