我不明白为什么这个JAXB IllegalAnnotationException被抛出 [英] I can't understand why this JAXB IllegalAnnotationException is thrown

问题描述

这是我的XML文件：

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

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

我做了两个类来解析它（Fields.java和Field.java）：

I made 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
}

但是我得到这个例外。 p>

But I get this exception.

[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]

I不明白为什么这个异常升高。例外是：

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，认为有两件事情映射到同一个名称（字段和属性）。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）注释字段

OPTION #1 - Annotate the Field with @XmlAccessorType(XmlAccessType.FIELD)

如果要注释该字段，则应指定 @XmlAccessorType（XmlAccessType.FIELD）

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

Fields.java：

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;
    }

}

.java：

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

默认访问器类型为 XmlAccessType.PUBLIC 。这意味着默认情况下，JAXB实现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： / strong>

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;
    }

}

.java：

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

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

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