执行服务对象时，@ Controller抛出NullPointerException

<beans xmlns=\"http://www.springframework.org/schema/beans\"
xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" 
xmlns:context=\"http://www.springframework.org/schema/context\"
xsi:schemaLocation=\"
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd\">

<context:component-scan base-package=\"com.test.paymentinterface.ui\" />
<bean id=\"mainService\" class=\"com.test.paymentinterface.service.MainService\" />

<bean
    class=\"org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping\" />

<bean
    class=\"org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter\" />

package com.thehutgroup.paymentinterface.ui;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.thehutgroup.paymentinterface.service.MainService;

@Controller
public class MainController {

private MainService mainService;

@Autowired
public void setMainService(MainService mainService) {
    this.mainService = mainService;
}

@RequestMapping(value = \"/\", method = RequestMethod.GET)
public ResponseEntity<String> healthcheck() {
    HttpHeaders headers = new HttpHeaders();
    headers.add(\"Content-Type\", \"text/plain\");
    return new ResponseEntity<String>(mainService.demoServiceResponse(), headers, HttpStatus.OK);
  }
}

package com.thehutgroup.paymentinterface.service;
public class MainService {
public String demoServiceResponse(){
    return \"Main Service has returned demo Service Response\";
}
}

mainService.demoServiceResponse()

return new ResponseEntity<String>(mainService.demoServiceResponse(), headers, HttpStatus.OK);

java.lang.NullPointerException
    at com.thehutgroup.paymentinterface.ui.MainController.healthcheck(MainController.java:32)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Thread.java:619)