Question

I am using SpringSource suit 2.9.2 and a newbie in Spring MVC world. I am trying to get an hold over object of Application Context using the following code: –

ApplicationContext context = new ClassPathXmlApplicationContext("root-context.xml");
UsersDaoImpl usersDao = context.getBean("usersDaoImpl", UsersDaoImpl.class);
Users user = usersDao.getUsers(name);
return user;

And its returning me FileNotFoundException exception. I tried different paths as well for ex. spring/root-context.xml etc. but nothing seems to work. Here is a stack trace: –

java.io.FileNotFoundException: class path resource [root-context.xml] cannot be opened because it does not exist
    org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:158)
    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:328)
    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
    org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
    org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
    org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
    org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
    org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    com.varundroid.demos.HomeController.testingDatabase(HomeController.java:65)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Any help would be really appreciated.

Thanks.

Answer 1

The main question here is why do you need to create new application context in web application instead of using the existing ones.

As far as I can see from your setup, you should have ContextLoaderListener and DispatcherServlet declared in your web.xml. If so, you need to access context loaded by these classes rather than to create a new one.

If you want to access ApplicationContext inside a Spring bean, you can use ApplicationContextAware or autowiring. If you want to do it outside of Spring bean (for example, in Servlet or Filter), you can use WebApplicationContextUtils.

UPDATE:

You don’t need to access ApplicationContext in this case. If you want to inject one Spring bean (DAO) into another one (controller), you can use autowiring:

@Autowired
private UserDao userDao;

Also note that if UserDaoImpl is a class that implements UserDao interface it would be better to use interface when declaring dependency.