在OSGI Bundle中创建JAXBContext的问题

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

public class MyJAXBContext {
    private JAXBContext jaxbContext;

    public MyJAXBContext() {
        try {
            jaxbContext = JAXBContext.newInstance("com.example.package");
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

    public JAXBContext getJAXBContext() {
        return jaxbContext;
    }
}

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class MyJAXBContext {
    private JAXBContext jaxbContext;

    public MyJAXBContext() {
        try {
            jaxbContext = JAXBContext.newInstance("com.example.package");
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }

    public void marshal(Object object, OutputStream outputStream) throws JAXBException {
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.marshal(object, outputStream);
    }

    public Object unmarshal(InputStream inputStream) throws JAXBException {
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        return unmarshaller.unmarshal(inputStream);
    }
}