Spring – RestTemplate GET request throws 400 Bad Request

I am getting 400 Bad Request when I send a request to Rest Service from JUnit Test case. PFB my code. The error log is towards the end. Kindly help me in resolving the issue. I am not getting any error when I call the server as: restTemplate.getForObject(BASE_URL + "/remote?serviceName=simpleService&source=WEB", HelloWorld.class) by passing the parameters directly in the URL. But how to pass using the map, that is where issue is coming.

My Controller:

@Controller
@RequestMapping("/remote")

public class RESTController implements IController{

@RequestMapping(method = RequestMethod.GET, headers = "Accept=application/xml,  application/json")
public @ResponseBody HelloWorld getMessage(@RequestParam("serviceName") String serviceName, @RequestParam("source") String source) throws ApplicationException{
    System.out.println("got the request:");
    serviceLocator serviceLocator = new serviceLocator();
    HelloWorld helloWorld = new HelloWorld();
    helloWorld.setMessage(serviceLocator.getMessage(serviceName));
    return helloWorld;
}

My Config:

<context:annotation-config />

<context:component-scan base-package="com" />

<mvc:annotation-driven />

<bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter" />
            <bean
                class="org.springframework.http.converter.StringHttpMessageConverter" />
            <bean id="jsonViewResolver"
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper" ref="JacksonObjectMapper" />
                <property name="supportedMediaTypes">
                    <list>
                        <bean class="org.springframework.http.MediaType">
                            <constructor-arg value="application" />
                            <constructor-arg value="json" />
                            <constructor-arg
                                value="#{T(java.nio.charset.Charset).forName('UTF-8')}" />
                        </bean>
                    </list>
                </property>
            </bean>

        </list>
    </property>
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />

My Controller Test:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("applicationContextTest.xml")
public class RESTControllerTest {

private static final String BASE_URL = "http://localhost:8080/SimpleServiceWeb/rest";

@Autowired
private RestTemplate restTemplate;

@Test
public void getMessage() throws Exception { 

    String expected = "Hello Spring!";
    HttpHeaders httpHeaders = new HttpHeaders();
    httpHeaders.setAccept(Collections
            .singletonList(MediaType.APPLICATION_XML));     

    MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
    map.add("serviceName", "simpleService");
    map.add("source", "WEB");

    ObjectMapper mapper = new ObjectMapper();
    ObjectWriter normalWriter = mapper.writer();
    String jsonString = normalWriter.writeValueAsString(map);;
    HttpEntity<Object> requestEntity = new HttpEntity<Object>(httpHeaders);     

    HelloWorld helloWorld = restTemplate.exchange(BASE_URL + "/remote",
             HttpMethod.GET, requestEntity, HelloWorld.class, map) .getBody();

    assertThat(helloWorld.getMessage(), is(expected));
}

}

My Test Config:

.simple" />

<mvc:annotation-driven />

<bean id="springServiceLocator" class="com.servicelocator.simple.SpringServiceLocator">
    <property name="simpleService" ref="simpleService" />
</bean>

<bean id="simpleService" class="com.service.simple.SimpleService" />

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">

    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter" />
            <bean
                class="org.springframework.http.converter.StringHttpMessageConverter" />
            <bean id="jsonViewResolver"
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper" ref="JacksonObjectMapper" />
                <property name="supportedMediaTypes">
                    <list>
                        <bean class="org.springframework.http.MediaType">
                            <constructor-arg value="application" />
                            <constructor-arg value="json" />
                            <constructor-arg
                                value="#{T(java.nio.charset.Charset).forName('UTF-8')}" />
                        </bean>
                    </list>
                </property>
            </bean>

        </list>
    </property>
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />

<bean id="httpClient" class="org.apache.commons.httpclient.HttpClient">
    <constructor-arg ref="httpClientParams" />
</bean>

<bean id="httpClientParams" class="org.apache.commons.httpclient.params.HttpClientParams">

    <property name="connectionManagerClass"
        value="org.apache.commons.httpclient.MultiThreadedHttpConnectionManager" />
</bean>

<bean id="httpClientFactory"
    class="org.springframework.http.client.CommonsClientHttpRequestFactory">
    <constructor-arg ref="httpClient" />
</bean>

Error:

org.springframework.web.client.HttpClientErrorException: 400 Bad Request
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:75)
at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:486)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:443)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:409)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:384)
at test.com.servicefacade.simple.RESTControllerTest.getMessage(RESTControllerTest.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)