java - MOXy JAXB javax.xml.bind.PropertyException

Question

我按照这个例子:http://wiki.eclipse.org/EclipseLink/Examples/MOXy/JSON_Twitter

现在我有这个类:

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.stream.StreamSource;

import org.eclipse.persistence.jaxb.MarshallerProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Foo.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        unmarshaller.setProperty("eclipselink.media-type", "application/json");
        unmarshaller.setProperty("eclipselink.json.include-root", false);
        StreamSource source = new StreamSource("http://test.url/path/to/resource");
        JAXBElement<Foo> jaxbElement = unmarshaller.unmarshal(source, Foo.class);

        System.out.println(jaxbElement.getValue().getFoo());

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
        marshaller.setProperty("eclipselink.json.include-root", false);
        marshaller.marshal(jaxbElement, System.out);
    }
}

我有jaxb.properties:

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

如果我运行这段代码，我会得到:

Exception in thread "main" javax.xml.bind.PropertyException: name: eclipselink.media-type value: application/json
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.setProperty(AbstractUnmarshallerImpl.java:352)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.setProperty(UnmarshallerImpl.java:450)
    at com.example.JavaSEClient.main(JavaSEClient.java:19)

我该如何解决这个问题？

我搜索了 SO 和谷歌，这些答案不起作用:

PropertyException when setting Marshaller property with eclipselink.media-type value: application/json JAXB javax.xml.bind.PropertyException

Answer 1

您需要确保您的 jaxb.properties 文件与您用来引导 JAXBContext 的域类在同一个包中，并且 EclipseLink MOXy 已打开你的类(class)路径。

• http://blog.bdoughan.com/search/label/jaxb.properties

如果您使用的是 Maven，则 jaxb.properties 文件应位于以下位置，假设 Foo 在名为 com.example.Foo 的包中:

• src/main/resources/com/example/foo/jaxb.properties
• src/main/java/com/example/foo/Foo.class

有关完整示例，请参阅:

• https://github.com/bdoughan/blog20110819