How do I autowire a field when running Spring4JUnitRunner test? - spring

Question

I'm using Spring 3.1.0.RELEASE. I'm having trouble autowiring a private variable from a Spring4JUnitRunner class. My JUnit class is ...
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration({ "file:src/main/webapp/WEB-INF/dispatcher-servlet.xml" })
public class RegistrationControllerTest {
#Autowired
private ApplicationContext applicationContext;
private MockHttpServletRequest request;
private MockHttpServletResponse response;
private HandlerAdapter handlerAdapter;
private RegistrationController controller;
#Before
public void setUp() {
request = new MockHttpServletRequest();
response = new MockHttpServletResponse();
handlerAdapter = applicationContext.getBean(HandlerAdapter.class);
// I could get the controller from the context here
controller = new RegistrationController();
final RegistrationValidation registrationValidation = new RegistrationValidation();
controller.setRegistrationValidation(registrationValidation);
}
Not sure if its relevant, but here's my dispathcer-servlet.xml file ...
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<!-- Enable annotation driven controllers, validation etc... -->
<mvc:annotation-driven />
<context:component-scan base-package="com.myco.eventmaven" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/views/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="/messages" />
</bean>
</beans>
Here is my controller. The "usersDao" field is null during my test, causing NullPointerExceptions (works fine when I run it as a normal webapp in JBoss) ...
#Controller
#RequestMapping("/registrationform.jsp")
public class RegistrationController {
private static Logger LOG = Logger.getLogger(RegistrationController.class);
#Autowired
private RegistrationValidation registrationValidation;
#Autowired
private UsersDao usersDao;
public void setRegistrationValidation(
RegistrationValidation registrationValidation) {
this.registrationValidation = registrationValidation;
}
// Display the form on the get request
#RequestMapping(method = RequestMethod.GET)
public String showRegistration(Map model) {
LOG.debug("called GET method.");
final Registration registration = new Registration();
model.put("registration", registration);
return "user/registrationform";
}
// Process the form.
#RequestMapping(method = RequestMethod.POST)
public String processRegistration(Registration registration, BindingResult result) throws NoSuchAlgorithmException, UnsupportedEncodingException {
String nextPage = "user/registrationform";
// set custom Validation by user
registrationValidation.validate(registration, result);
if (result.hasErrors()) {
return nextPage;
} else {
// Save the user to the database.
if (usersDao.saveUser(registration)) {
nextPage = "user/registrationsuccess";
} // if
} // if
return nextPage;
}
The class of the member field, usersDao, is annotated with the #Component annotation ...
#Component("usersDao")
public class UsersDaoImpl implements UsersDao {
What additional configuration do I need to add to properly autowire the dao object in my JUnit class? Thanks, -

Answer 1

You're getting the null because you're instantiating RegistrationController yourself, instead of getting the bean from Spring. You almost figured that out for yourself:
// I could get the controller from the context here
controller = new RegistrationController();
You could, and you should. Remove those two lines, and use the following on the field declartion:
#Autowired
private RegistrationController controller;