Unable to assign autowired child bean to parent object in Spring Boot - spring

Question

XML Config:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<bean class="com.fossians.maven_courses.Say_Impl" id="id_Say_Impl" />
</beans>
Say_I
public interface Say_I
{
public void Say_I_m1();
}
Say_Impl
public class Say_Impl implements Say_I
{
public void Say_I_m1()
{
System.out.println("inside : public void Say_I_m1() \n");
}
}
Controller :
public class Controller_Test implements SpringApplicationContextInterface
{
#Autowired
private Say_Impl say_Impl;
//Below line not assigning, need to reassign into method
private Say_I say_I = (Say_I) say_Impl;
// private Say_I say_I = (Say_I) applicationContext.getBean("id_Say_Impl");
#RequestMapping(value = "/test10")
public String Test1()
{
say_I = say_Impl;
System.out.println("Say_Impl_auto : "+say_Impl);
System.out.println("Say_I : "+say_I);
say_I.Say_I_m1();
return " request value = test10 ";
}
}
public interface SpringApplicationContextInterface
{
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beanConfig.xml");
}
#SpringBootApplication
#ImportResource("classpath:beanConfig.xml")
public class Courses extends SpringBootServletInitializer
{
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application)
{
return application.sources(Courses.class);
}
}
The above code is part of a spring boot application.
This line of code inside "Controller_Test" class :
private Say_I say_I = (Say_I) say_Impl;
is not assigning Say_Impl object "say_Impl" reference into its parent object say_I. But if i am assigning it again into Test1() method then it is working.
But the below line of code is assigning the say_Impl reference into say_I object.
private Say_I say_I = (Say_I) applicationContext.getBean("id_Say_Impl");
Now my question is, when i am taking the say_impl object by autowiring why i need to reassign it into method? Is there any way to make it working without reassigning?
When i am taking the bean by application context then i need not to reassign, Why?

Answer 1

Very ugly code, legacy xml with spring boot WTF?
Try this
#Autowired
private Say_I say_I;
or better:
#SpringBootApplication
public class Courses {
public static void main(String[] args) {
SpringApplication.run(Courses.class, args);
}
#RestController
public class Controller_Test {
#Autowired
private Say_I say_I;
#RequestMapping(value = "/test10")
public String Test1() {
System.out.println("Say_I : " + say_I);
say_I.Say_I_m1();
return " request value = test10 ";
}
}
#Component
public class Say_I {
void Say_I_m1() {
System.out.println("inside : public void Say_I_m1() \n");
}
}
}