Jaxb：非法注释异常。

Question

我遇到了以下异常："1个IllegalAnnotationExceptions"

代码：

Image image = new Image("url");
StringWriter sw = new StringWriter();
JAXBContext jaxbContext = JAXBContext.newInstance(Image.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.marshal(image, sw);

类：

@XmlRootElement(name="ProductImage")
public class Image {

    private String url;

    public Image( String url) {   
        this.url = url;
    }

    @XmlElement(name = "ImageLocation")
    public String getUrl() {
        return this.url;
    }
}

我尝试在字段上设置@XmlElement注解，并在类上设置AccessorType Field，但是我仍然遇到了相同的异常。

---

我缺少默认构造函数。 public Image () { }

- PhantomM

---

你所遇到的异常有什么堆栈跟踪信息？ - bdoughan

Answer 1

请使用此类...

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlRootElement(name="ProductImage")
@XmlAccessorType(XmlAccessType.PROPERTY)
@XmlType(name = "ProductImage", propOrder = {
    "url"
})
public class Image {

    public Image(){}

    private String url;

    public Image( String url) {   
        this.url = url;
    }

    @XmlElement(name = "ImageLocation")
    public String getUrl() {
        return this.url;
    }
}

生成的XML为：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ProductImage>
    <ImageLocation>url</ImageLocation>
</ProductImage>

- Xstian