import com.sun.xml.internal.ws.util.ServiceConfigurationError; //导入依赖的package包/类
public static Iterator<BindingContextFactory> serviceIterator() {
    final ServiceFinder<BindingContextFactory> sf = ServiceFinder
            .find(BindingContextFactory.class);
    final Iterator<BindingContextFactory> ibcf = sf.iterator();

    return new Iterator<BindingContextFactory>() {
        private BindingContextFactory bcf;

        public boolean hasNext() {
            while (true) {
                try {
                    if (ibcf.hasNext()) {
                        bcf = ibcf.next();
                        return true;
                    } else
                        return false;
                } catch (ServiceConfigurationError e) {
                    LOGGER.warning("skipping factory: ServiceConfigurationError: "
                            + e.getMessage());
                } catch (NoClassDefFoundError ncdfe) {
                    LOGGER.fine("skipping factory: NoClassDefFoundError: "
                            + ncdfe.getMessage());
                }
            }
        }

        public BindingContextFactory next() {
            if (LOGGER.isLoggable(Level.FINER))
                LOGGER.finer("SPI found provider: " +
                        bcf.getClass().getName());
            return bcf;
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}