<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<getMinTaxableAmountRequest xmlns="http://gosloto.ru/xsd">
    <header>
        <requestID>1</requestID>
        <date>2016-10-06T00:00:00.000+03:00</date>
    </header>
</getMinTaxableAmountRequest>

<getMinTaxableAmountRequest xmlns="http://gosloto.ru/xsd">
    <header>
        <requestID>1</requestID>
        <date>2016-10-06T00:00:00.000+03:00</date>
    </header>
</getMinTaxableAmountRequest>

 @Test
    public void testGetMinTaxableAmountRequest() throws URISyntaxException, DatatypeConfigurationException, JAXBException  {
        GetMinTaxableAmountRequest amountRequest = new GetMinTaxableAmountRequest();
        
        TRequestHeader header = new TRequestHeader();
        header.setRequestID("1");
        
        LocalDate date = LocalDate.now();
        GregorianCalendar gcal = GregorianCalendar.from(date.atStartOfDay(ZoneId.systemDefault()));
        XMLGregorianCalendar xcal = DatatypeFactory.newInstance().newXMLGregorianCalendar(gcal);

        header.setDate(xcal);
        amountRequest.setHeader(header);
        
        Utils.marshaller(amountRequest, System.out); // Это через JAXBContext

//<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
//<getMinTaxableAmountRequest xmlns="http://gosloto.ru/xsd">
//    <header>
//        <requestID>1</requestID>
//        <date>2016-10-06T00:00:00.000+03:00</date>
//    </header>
//</getMinTaxableAmountRequest>
        
        
        RequestEntity<GetMinTaxableAmountRequest> requestEntity  = RequestEntity.post(new URI(ortaxUrl))
                .accept(MediaType.APPLICATION_XML)
                .contentType(MediaType.APPLICATION_XML)
                .body(amountRequest);
        
        
        log.info(requestEntity);
        
        ResponseEntity<GetMinTaxableAmountResponse> responseEntity = 
       
          restTemplate.exchange(requestEntity, GetMinTaxableAmountResponse.class);

        
        
        log.info(responseEntity);
        log.info(responseEntity.getBody());

    }

        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
        </dependency>
        

        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        Jaxb2RootElementHttpMessageConverter jaxbMessageConverter = new Jaxb2RootElementHttpMessageConverter();
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.APPLICATION_XML);
        jaxbMessageConverter.setSupportedMediaTypes(mediaTypes);
        messageConverters.add(jaxbMessageConverter);
        restTemplate.setMessageConverters(messageConverters);

ResponseEntity<String> result = restTemplate.exchange(requestEntity,  String.class);