import com.sun.xml.internal.ws.developer.MemberSubmissionEndpointReference; //导入依赖的package包/类
private static JAXBContext getEPRJaxbContext() {
    // EPRs have package and private fields, so we need privilege escalation.
    // this access only fixed, known set of classes, so doing that
    // shouldn't introduce security vulnerability.
    return AccessController.doPrivileged(new PrivilegedAction<JAXBContext>() {
        public JAXBContext run() {
            try {
                return JAXBContext.newInstance(MemberSubmissionEndpointReference.class, W3CEndpointReference.class);
            } catch (JAXBException e) {
                throw new WebServiceException("Error creating JAXBContext for W3CEndpointReference. ", e);
            }
        }
    });
}