Declaration of beans in applicationContext.xml
hibernate, java, javabeans, jsf-2, spring
Solution
In applicationContext.xml do we need to specify all the classes from the application?
No. Declaring model classes like your `net.test.model.Employees` is pointless unless you need a prototype to work with, something like initializing its values, but you can do this directly in the class and just instantiate it.
So if I have multiple entity, service and dao classes do I need to mention all those classes in applicationContext.xml?
As I explained before, entity classes no. Services and DAOs are ok because most of the time you need DAOs injected to the Services (and that's the point of DI). But of course, if you create 3 DAOs and you want them to be injected in your 3 Services, then mention them in your Spring XML Bean Definition file (what you call `applicationContext.xml`).
But one thing, you may want to use package scanning autodetection and annotation based config to avoid writing everything in your Bean Definition File.
Problem
I have a question regarding declaration of classes in applicationContext.xml In applicationContext.xml do we need to specify all the classes from the application? E.g. In my small web application I have a Entity class, Service class and DAO class. So currently it is defined as ``` <!-- Beans Declaration --> <bean id="Employees" class="net.test.model.Employees" /> <!-- User Service Declaration --> <bean id=" EmployeeService" class="net.test.employees.service.EmployeeService"> <property name="employeesDAO" ref="EmployeeDAOImpl" /> </bean> <!-- User DAO Declaration --> <bean id="EmployeeDAO" class="net.test.employee.dao.EmployeeDAOImpl"> <property name="sessionFactory" ref="SessionFactory" /> </bean> ``` So if I have multiple entity, service and dao classes do I need to mention all those classes in `applicationContext.xml`? Any insight into this is highly appreciable. Regards Update 1 ManagedBean ``` @ManagedBean(name="empMB") @Named @Scope("request") public class EmployeesManagedBean implements Serializable { ``` and I have Inject annotation ``` @Inject EmployeesService employeesService; ``` In EmployeesService I have annotations like ``` @Named public class EmployeesService implements IEmployeesService { @Inject EmployeesDAO employeesDAO; @Override public List<Employees> getEmployees() { return getEmployeesDAO().getEmployees(); } ``` and finally in applicationContext.xml I have ``` <context:component-scan base-package="net.test" /> ``` Now the problem is when I run my application I am getting ``` java.lang.NullPointerException at net.test.managed.bean.EmployeesManagedBean.getEmpList(EmployeesManagedBean.java:53) ``` What am I doing wrongly to get nullpointer exception?