解析 XML 期间抛出 JAXB IllegalAnnotationException

2022-01-19 00:00:00 xml java jaxb

这是我的 XML 文件:

This is my XML file:

<fields>
    <field mappedField="Num">
    </field>
    
    <field mappedField="Type">      
    </field>    
</fields>

我创建了 2 个类来解析它(Fields.java 和 Field.java):

I created 2 classes to parse it (Fields.java and Field.java):

@XmlRootElement(name = "fields")
public class Fields {

    @XmlElement(name = "field")
    List<Field> fields = new ArrayList<Field>();
        //getter, setter
}

和

public class Field {

    @XmlAttribute(name = "mappedField")
    String mappedField;
    //getter,setter
}

但我得到了这个例外:

[INFO] com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
[INFO]  at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:66) ~[na:1.6.0_07]
[INFO]  at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:422) ~[na:1.6.0_07]
[INFO]  at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:270) ~[na:1.6.0_07]

我不明白为什么会出现这个异常.例外在这里:

I can't understand why this exception rises. Exception is here:

JAXBContext context = JAXBContext.newInstance(Fields.class);

我使用 JDK 1.6_0.0.7.谢谢.

I use JDK 1.6_0.0.7. Thanks.

推荐答案

异常是由于您的 JAXB (JSR-222) 实现认为有两个事物映射为同名(一个字段和一个属性).您的用例有几个选项:

The exception is due to your JAXB (JSR-222) implementation believing that there are two things mapped with the same name (a field and a property). There are a couple of options for your use case:

选项 #1 - 使用 @XmlAccessorType(XmlAccessType.FIELD)

如果你想对该字段进行注释，那么你应该指定 @XmlAccessorType(XmlAccessType.FIELD)

If you want to annotation the field then you should specify @XmlAccessorType(XmlAccessType.FIELD)

Fields.java:

package forum10795793;

import java.util.*;
import javax.xml.bind.annotation.*;

@XmlRootElement(name = "fields")
@XmlAccessorType(XmlAccessType.FIELD)
public class Fields {

    @XmlElement(name = "field")
    List<Field> fields = new ArrayList<Field>();

    public List<Field> getFields() {
        return fields;
    }

    public void setFields(List<Field> fields) {
        this.fields = fields;
    }

}

Field.java:

package forum10795793;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Field {

    @XmlAttribute(name = "mappedField")
    String mappedField;

    public String getMappedField() {
        return mappedField;
    }

    public void setMappedField(String mappedField) {
        this.mappedField = mappedField;
    }

}

选项 #2 - 注释属性

默认访问器类型是 XmlAccessType.PUBLIC.这意味着默认情况下，JAXB 实现会将公共字段和访问器映射到 XML.使用默认设置，您应该注释要覆盖默认映射行为的公共访问器.

The default accessor type is XmlAccessType.PUBLIC. This means that by default JAXB implementations will map public fields and accessors to XML. Using the default setting you should annotate the public accessors where you want to override the default mapping behaviour.

Fields.java:

package forum10795793;

import java.util.*;
import javax.xml.bind.annotation.*;

@XmlRootElement(name = "fields")
public class Fields {

    List<Field> fields = new ArrayList<Field>();

    @XmlElement(name = "field")
    public List<Field> getFields() {
        return fields;
    }

    public void setFields(List<Field> fields) {
        this.fields = fields;
    }

}

Field.java:

package forum10795793;

import javax.xml.bind.annotation.*;

public class Field {

    String mappedField;

    @XmlAttribute(name = "mappedField")
    public String getMappedField() {
        return mappedField;
    }

    public void setMappedField(String mappedField) {
        this.mappedField = mappedField;
    }

}

更多信息

  • http://blog.bdoughan.com/2011/06/using-jaxbs-xmlaccessortype-to.html

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