Spring mvc RestTemplate postForObject doesn't send parameter to REST API - spring

Question

I have a REST API. I'm making a client.
I configured spring security to authentication by my rest service.
My REST API controller
#RequestMapping(value = "/login", method = RequestMethod.POST, headers="content-type=application/json")
public #ResponseBody
UserDetails loginUser(WebRequest request)
throws LoginOrPasswordException {
logger.info("login user");
logger.info(request);
String username = request.getParameter("username");
logger.info(username);
UserDetails uDetails = userRepository.login(username);
System.out.println(uDetails.getPassword());
return uDetails;
}
Application context of API
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.zayats." />
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
</list>
</property>
</bean>
<!-- Http Json MessageConverter -->
<bean id="jsonConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes" value="application/json" />
</bean>
<import resource="jdbc-config.xml" />
Next is client method with restTemplate
HashMap<String, String> params = new HashMap<String, String>();
params.put("username", username);
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<?> httpEntity = new HttpEntity<Object>(params, requestHeaders);
logger.info("Create map and doing request.");
UserDetails matchingUser = restTemplate.postForObject(
"http://localhost:8080/ApiFamilyShoplist/user/login", httpEntity,
UserDetails.class);
Rest Template config
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<property name="messageConverters">
<list>
<bean id="jsonConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes" value="application/json" />
</bean>
</list>
</property>
</bean>
When I call my API with postForObject in controller of API doesn't receive any parameters.
Please, give me some advice how to make it to send data to API.
Thanks.

Answer 1

You need to have another parameter in your method to accept the string parameter and annotate it with #RequestBody (inside the method signature):
#ResponseBody
#Consumes("text/plain")
public UserDetails loginUser(WebRequest request, #RequestBody String userName)
Also, if you're passing a string, I suggest to add a simple http string converter to the converters of the rest template and annotate the server method with #Consumes(text/plain). This way you'll get it as a simple string.