Let us create beans inside a JavaConfig's context definition class:

1. Inside the ch02-jcsrcmainjava directory, create a package: org.packt.starter.ioc.model. Implement the same Employee and Department model classes as in the previous recipe, Managing the beans in a XML-based container recipe. Open BeanConfig context definition class and inject these newly created Employee and Department beans in the container:

@Configuration 
public class BeanConfig { 
    
      @Bean(name="empRec1") 
      public Employee getEmpRecord1(){ 
         Employee empRec1 = new Employee(); 
         return empRec1; 
      } 
 
      @Bean(name="dept1") 
      public Department getDept1(){ 
         Department dept1 = new Department(); 
         return dept1; 
      } 
} 

2. To pass actual values and object references to the beans, we programmatically use the setters as one of the approaches for dependency injection. Add the following modifications to BeanConfig:

@Bean(name="empRec2") 
public Employee getEmpRecord2(){ 
    Employee empRec2 = new Employee(); 
    empRec2.setFirstName("Juan"); 
    empRec2.setLastName("Luna"); 
    empRec2.setAge(50); 
    empRec2.setBirthdate(new Date(45,9,30)); 
    empRec2.setPosition("historian"); 
    empRec2.setSalary(100000.00); 
    empRec2.setDept(getDept2()); 
    return empRec2; 
} 
 
@Bean(name="dept2") 
public Department getDept2(){ 
    Department dept2 = new Department(); 
    dept2.setDeptNo(13456); 
    dept2.setDeptName("History Department"); 
    return dept2; 
} 

3. Another approach is to use the overloaded constructor for the dependency injection. Add the following modifications to BeanConfig:

@Bean(name="empRec3") 
public Employee getEmpRecord3(Department dept2){ 
   Employee empRec1 = new Employee("Jose","Rizal", 
 new Date(50,5, 19), 101, 90000.00, "scriber", getDept3()); 
   return empRec1; 
} 
 
@Bean(name="dept3") 
public Department getDept3(){ 
   Department dept3 = new Department(56748, 
"Communication Department"); 
   return dept3; 
} 

4. Inside the package org.packt.starter.ioc.model.test in src estjava, create a TestBeans class that will instantiate the ApplicationContext container using org.springframework.context.annotation.AnnotationConfigApplicationContext and will fetch all the beans using the familiar method getBean():

public class TestBeans { 
   public static void main(String[] args) { 
       AnnotationConfigApplicationContext context = 
                 new AnnotationConfigApplicationContext(); 
       context.register(BeanConfig.class); 
      
       System.out.println("--Result by 
       Setter based Dependency Injection--"); 
       context.refresh(); 
       Employee empRec1 = (Employee) 
                     context.getBean("empRec1"); 
       //refer to sources 
       context.registerShutdownHook(); 
    }   
}