Spring RestTemplate post 500 internal server exceotion

I am getting below exception When I am hitting url.

org.springframework.web.client.HttpServerErrorException: 500 Internal Server Error
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)
    at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:537)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:493)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:459)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:408)
    at com.capitalone.dms.gumbo.web.service.impl.WCSRestClientImpl.execute(WCSRestClientImpl.java:42)
    at com.capitalone.dms.gumbo.web.service.impl.HomeServiceImpl.getCustomerResponse(HomeServiceImpl.java:65)
    at com.capitalone.dms.gumbo.web.controller.HomeController.getCustomerMessageResponse(HomeController.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.capitalone.epf.context.filters.EPFContextServletFilter.doFilter(EPFContextServletFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at com.capitalone.upf.openupf.security.authentication.valve.UpfRequestContextThreadLocalValve.invoke(UpfRequestContextThreadLocalValve.java:80)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

I am written below code Using spring with Rest Template

String url = "https://<url>";
        HttpHeaders header = new HttpHeaders();
        header.set("Api-Key", "RTM");
        header.set("Accept", "application/json;v=3");
        header.setContentType(MediaType.APPLICATION_JSON);
        Gson gson = new Gson();
        messageRequest = gson.toJson(messageNotification);
        HttpEntity<?> request = new HttpEntity<Object>(messageRequest, header);
        Map<String, String> urlVariables = new HashMap<String, String>();

        restTemplate.setRequestFactory(new MyBasicAuthentication());
        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, request, String.class,
                urlVariables);

For host verification I written below code

public class MyBasicAuthentication extends SimpleClientHttpRequestFactory {

        private static class MyHostnameVerifier implements HostnameVerifier {
            @Override
            public boolean verify(String urlHostName, SSLSession session) {
                return true;
            }
        }

        @Override
        protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {


            if (connection instanceof HttpsURLConnection) {
                ((HttpsURLConnection) connection).setHostnameVerifier(new MyHostnameVerifier());
            }
            super.prepareConnection(connection, httpMethod);
        }

Any one can please help me hoe to resolve this issue.