web.xml
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>spring-mvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
my spring-mvc-servlet.xml
<context:component-scan base-package="org.app.controller" />
<mvc:resources mapping="/resources/**" location="/WEB-INF/resources/" />
<mvc:annotation-driven />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
my controller: Just for illustration
@Controller
public class HomeController {
LoginService loginService;
@RequestMapping(value = "/", method = RequestMethod.GET)
public String login(Model model) {
loginService.checkLoginDetails(new LoginDetails("Svn", 1));
return "login";
}
AppplicationContext.xml
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- <context:annotation-config /> -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/test"></property>
<property name="username" value="root"></property>
<property name="password" value=""></property>
</bean>
<bean class="org.app.controller.HomeController" autowire="byName"></bean>
<bean id="loginDAO" class="org.app.DAOImpl.LoginDAOImpl" autowire="byName"></bean>
<bean id="loginService" class="org.app.DAOServiceImpl.LoginServiceImpl" autowire="byName"></bean>
<bean id="employeeDAO" class="org.app.DAOImpl.EmployeeDAOImpl" autowire="byName"></bean>
<bean id="employeeService" class="org.app.DAOServiceImpl.EmployeeDAOServiceImpl" autowire="byName"></bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="annotatedClasses">
<list>
<value>org.app.entity.Employee</value>
<value>org.app.entity.LoginDetails</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.hbm2ddl.auto">create</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<!-- <context:component-scan base-package="org.infy"> <context:exclude-filter
expression="org.springframework.stereotype.Controller" type="annotation"
/> </context:component-scan> -->
<tx:annotation-driven />
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>
LoginServiceImpl
public class LoginServiceImpl implements LoginService{
LoginDAO loginDAO;
@Override
@Transactional
public boolean checkLoginDetails(LoginDetails loginDetails) {
return loginDAO.checkLoginDetails(loginDetails);
}
}
Problem: My LoginDAO is null. Spring is not able to instantiate it's object using auto-wiring when done without annotation, however, works fine when I use it with annotation along with appropriate changes in ApplicationContext.xml.
My LoginService bean is getting instantiated by the component scan of dispatcher servlet context. Now when instantiating LoginServiceImpl spring should look into RootApplication context for other bean definitions however it doesn't. I don't understand why does this happen when using @autowire with or enabling the component scan. it works fine then why not without annotation.
I'm also not sure what I'm trying to do. I was playing with Spring MVC and got stuck on this.
