How to define a Spring bean using annotation instead of XML? - spring

Question

I have defined in a xml config file:
<bean id="bootstrap" class="com.package.Bootstrap"></bean>
this works fine.
The bootsrap class :
public class Bootstrap {
#PostConstruct
public void onServerStart() {
System.out.println("PRINTSSSSSSSSSSSSSSSSSSS");
}
}
The method gets fired.
But how can I get rid of the xml part, and annotate bootstrap to be a bean instead?
I have
<mvc:annotation-driven />
<context:annotation-config />
and
<context:component-scan base-package="com.package" />
But I was wondering what the annotation used should be that replaces:
<bean id="bootstrap" class="com.package.Bootstrap"></bean>
I could not find anything about this online and in the spring docs :(

Answer 1

There's documentation regarding this; you'll want a stereotype annotation like #Component.
Stereotype bean annotations

Answer 2

this is a simple example that I have just made:
Main.java
package the.test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
public class Main {
public static void main(String[] args) {
AbstractApplicationContext aac = new AnnotationConfigApplicationContext(Person.class, Phones.class);
Person person = aac.getBean(Person.class);
System.out.println(person.getPhones().getPhoneOne());
System.out.println(person.getPhones().getPhoneTwo());
System.out.println(person.getSurname());
System.out.println(person.getName());
System.out.println(person.getAge());
aac.close();
}
}
Person.java
package the.test;
import javax.annotation.Resource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
#Configuration
//you may use #ComponentScan("the.test") here and omit declaring
//"Phone.class" in the main method
public class Person {
private int age;
private String name;
private String surname;
private Phones phones;
public int getAge() {
return age;
}
#Value("33")
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
#Value("John")
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
#Value("Due")
public void setSurname(String surname) {
this.surname = surname;
}
public Phones getPhones() {
return phones;
}
#Resource
public void setPhones(Phones phones) {
this.phones = phones;
}
}
Phones.java
package the.test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
#Configuration
public class Phones {
private String PhoneOne;
private String PhoneTwo;
public String getPhoneOne() {
return PhoneOne;
}
#Value("987654321")
public void setPhoneOne(String phoneOne) {
PhoneOne = phoneOne;
}
public String getPhoneTwo() {
return PhoneTwo;
}
#Value("123456")
public void setPhoneTwo(String phoneTwo) {
PhoneTwo = phoneTwo;
}
}
this is completely based on Spring Annotation and is made on spring framework 4.2.5
hope it helps.