Spring Web service - attaching header to SOAP req

SoapUtils.java

import org.springframework.ws.client.core.WebServiceMessageCallback;
import org.springframework.ws.soap.SoapHeader;
import org.springframework.ws.soap.SoapMessage;

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

import static com.mwronski.log.Tracer.tracer;

public final class SoapUtils {

    /**
     * Create JAXB context
     *
     * @param objects objects that should be defined in scope of ctx
     * @return new instance
     * @throws JAXBException when ctx couldn't be created
     */
    private static JAXBContext jaxbCtx(Object... objects) throws JAXBException {
        Class[] classes = new Class[objects.length];
        for (int i = 0; i < objects.length; i++) {
            classes[i] = objects[i].getClass();
        }
        return JAXBContext.newInstance(classes);
    }

    /**
     * Attach headers to out-going SOAP request
     *
     * @param headers headers to be attached
     * @return new instance of callback that will attach headers
     */
    public static WebServiceMessageCallback withHeaders(Object... headers) {
        return (wsMsg) -> {
            SoapHeader soapHeader = ((SoapMessage) wsMsg).getSoapHeader();
            try {
                JAXBContext context = jaxbCtx(headers);
                Marshaller marshaller = context.createMarshaller();
                for (Object header : headers) {
                    marshaller.marshal(header, soapHeader.getResult());
                }
            } catch (JAXBException e) {
                tracer(SoapUtils.class).error("Couldn't attach headers", e);
            }
        };
    }

    private SoapUtils() {
        //no instances
    }

}