Think like a compiler.: 9.0 Practice Project using Spring Annotations

PROJECT TO WORK FOR PRACTICE (DOWNLOAD)

1. IoC Section

@Component annotation

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Movie.java
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package com.demo.spring;

public interface Movie {
public String getMovie();
}

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Bollywood.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

@Component("bollywood")

public class Bollywood implements Movie {

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

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Hollywood.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

@Component("hollywood")

public class Hollywood implements Movie {

@Override

public String getMovie() {

return "Hollywood is famous for its creativity.";

}

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Tollywood.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

@Component("tollywood")

public class Tollywood implements Movie {

@Override

public String getMovie() {

return "Tollywood is famous for storyline";

}

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Entertainment.java
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package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Entertainment {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

System.out.println("Bollywood : "+obj.getMovie());

Movie obj1=context.getBean("hollywood",Movie.class);

System.out.println("Hollywood : "+obj1.getMovie());

Movie obj2=context.getBean("tollywood",Movie.class);

System.out.println("Tollywood : "+obj2.getMovie());

context.close();

}

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applicationContext.xml
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<?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: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/context

http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="com.demo.spring"></context:component-scan>

</beans>

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OUTPUT
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Feb 26, 2018 5:21:22 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:21:22 IST 2018]; root of context hierarchy

Feb 26, 2018 5:21:22 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Bollywood : Bollywood id famous for acting and songs

Hollywood : Hollywood is famous for its creativity.

Tollywood : Tollywood is famous for storyline

Feb 26, 2018 5:21:22 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:21:22 IST 2018]; root of context hierarchy

@Autowired annotation

Constructor injection

package com.demo.spring;

public interface Movie {

public String getMovie();

public String getCategory();

}

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("bollywood")

public class Bollywood implements Movie {

private Category cat;

//constructor-injection

@Autowired

public Bollywood(Category getcat){

cat=getcat;

}

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

@Override

public String getCategory() {

return cat.getCategory();

}

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("hollywood")

public class Hollywood implements Movie {

private Category cat;

//constructor injection

@Autowired

public Hollywood(Category thecat){

cat=thecat;

}

@Override

public String getMovie() {

return "Hollywood is famous for its creativity.";

}

@Override

public String getCategory() {

return cat.getCategory();

}

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Tollywwod.java
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package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("tollywood")

public class Tollywood implements Movie {

private Category cat;

//constructor injection

@Autowired

public Tollywood(Category thecat){

cat=thecat;

}

@Override

public String getMovie() {

return "Tollywood is famous for storyline";

}

@Override

public String getCategory() {

return cat.getCategory();

}

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Category.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

public interface Category {

public String getCategory();

}

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Comedy.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

@Component

public class Comedy implements Category {

@Override

public String getCategory() {

return "Commedy is for fun";

}

<?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: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/context

http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="com.demo.spring"></context:component-scan>

</beans>

package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Entertainment {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

System.out.println("Bollywood : "+obj.getMovie());

System.out.println("Bollywood category : "+obj.getCategory());

Movie obj1=context.getBean("hollywood",Movie.class);

System.out.println("Hollywood : "+obj1.getMovie());

System.out.println("Hollywood category : "+obj1.getCategory());

Movie obj2=context.getBean("tollywood",Movie.class);

System.out.println("Tollywood : "+obj2.getMovie());

System.out.println("Tollywood category : "+obj2.getCategory());

context.close();

}

Feb 26, 2018 5:38:04 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:38:04 IST 2018]; root of context hierarchy

Feb 26, 2018 5:38:04 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Bollywood : Bollywood id famous for acting and songs

Bollywood category : Commedy is for fun

Hollywood : Hollywood is famous for its creativity.

Hollywood category : Commedy is for fun

Tollywood : Tollywood is famous for storyline

Tollywood category : Commedy is for fun

Feb 26, 2018 5:38:04 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:38:04 IST 2018]; root of context hierarchy

@Autowired annotation

Setter injection

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("bollywood")

public class Bollywood implements Movie {

private Category cat;

//constructor-injection

@Autowired

public Bollywood(Category getcat){

cat=getcat;

}

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

//Setter injection

@Autowired

public void setCat(Category cat) {

this.cat = cat;

}

@Override

public String getCategory() {

return cat.getCategory();

}

package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Entertainment {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

System.out.println("Bollywood : "+obj.getMovie());

System.out.println("Bollywood category (setter): "+obj.getCategory());

Movie obj1=context.getBean("hollywood",Movie.class);

System.out.println("Hollywood : "+obj1.getMovie());

System.out.println("Hollywood category : "+obj1.getCategory());

Movie obj2=context.getBean("tollywood",Movie.class);

System.out.println("Tollywood : "+obj2.getMovie());

System.out.println("Tollywood category : "+obj2.getCategory());

context.close();

}

Feb 26, 2018 5:44:59 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:44:59 IST 2018]; root of context hierarchy

Feb 26, 2018 5:44:59 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Bollywood : Bollywood id famous for acting and songs

Bollywood category (setter): Commedy is for fun

Hollywood : Hollywood is famous for its creativity.

Hollywood category : Commedy is for fun

Tollywood : Tollywood is famous for storyline

Tollywood category : Commedy is for fun

Feb 26, 2018 5:45:00 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:44:59 IST 2018]; root of context hierarchy

@Autowired annotation

method injection

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("hollywood")

public class Hollywood implements Movie {

private Category cat;

//constructor injection

/* @Autowired

public Hollywood(Category thecat){

cat=thecat;

}*/

@Autowired

public void doSomeCrazyStuff()

{

System.out.println("Hollywood : this is a random method");

}

@Override

public String getMovie() {

return "Hollywood is famous for its creativity.";

}

@Override

public String getCategory() {

return cat.getCategory();

}

package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Entertainment {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

System.out.println("Bollywood : "+obj.getMovie());

System.out.println("Bollywood category (setter): "+obj.getCategory());

Hollywood obj1=context.getBean("hollywood",Hollywood.class);

System.out.println("Hollywood : "+obj1.getMovie());

obj1.doSomeCrazyStuff();

Movie obj2=context.getBean("tollywood",Movie.class);

System.out.println("Tollywood : "+obj2.getMovie());

System.out.println("Tollywood category : "+obj2.getCategory());

context.close();

}

Feb 26, 2018 5:51:16 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:51:16 IST 2018]; root of context hierarchy

Feb 26, 2018 5:51:16 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Feb 26, 2018 5:51:17 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor lambda$buildAutowiringMetadata$2

WARNING: Autowired annotation should only be used on methods with parameters: public void com.demo.spring.Hollywood.doSomeCrazyStuff()

Hollywood : this is a random method

Bollywood : Bollywood id famous for acting and songs

Bollywood category (setter): Commedy is for fun

Hollywood : Hollywood is famous for its creativity.

Hollywood : this is a random method

Tollywood : Tollywood is famous for storyline

Tollywood category : Commedy is for fun

Feb 26, 2018 5:51:17 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:51:16 IST 2018]; root of context hierarchy

@Autowired annotation

field injection

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component("tollywood")

public class Tollywood implements Movie {

@Autowired

private Category cat;

/* //constructor injection

@Autowired

public Tollywood(Category thecat){

cat=thecat;

}*/

@Override

public String getMovie() {

return "Tollywood is famous for storyline";

}

@Override

public String getCategory() {

return cat.getCategory();

}

package com.demo.spring;

Feb 26, 2018 5:55:17 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:55:16 IST 2018]; root of context hierarchy

Feb 26, 2018 5:55:17 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Feb 26, 2018 5:55:17 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor lambda$buildAutowiringMetadata$2

WARNING: Autowired annotation should only be used on methods with parameters: public void com.demo.spring.Hollywood.doSomeCrazyStuff()

Hollywood : this is a random method

Bollywood : Bollywood id famous for acting and songs

Bollywood category (setter): Commedy is for fun

Hollywood : Hollywood is famous for its creativity.

Hollywood : this is a random method

Tollywood : Tollywood is famous for storyline

Tollywood category : Commedy is for fun

Feb 26, 2018 5:55:17 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:55:16 IST 2018]; root of context hierarchy

@Autowired is working because we have only one bean dependency qualifier as of now . Lets create one more

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Action.java
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package com.demo.spring;

import org.springframework.stereotype.Component;

@Component

public class Action implements Category {

@Override

public String getCategory() {

return "Action movies are breathtaking";

}

now we have two Comedy and Action. If you execute your program now then

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EXCEPTION
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Feb 26, 2018 5:58:31 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 17:58:31 IST 2018]; root of context hierarchy

Feb 26, 2018 5:58:31 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

Feb 26, 2018 5:58:32 PM org.springframework.context.support.AbstractApplicationContext refresh

WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bollywood': Unsatisfied dependency expressed through method 'setCat' parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.demo.spring.Category' available: expected single matching bean but found 2: action,comedy

Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bollywood': Unsatisfied dependency expressed through method 'setCat' parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.demo.spring.Category' available: expected single matching bean but found 2: action,comedy

to resolve this we will use @Qualifier(bean id)

note : bean id is the classname in smallletters

@Qualifier annotation

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Component;

@Component("bollywood")

public class Bollywood implements Movie {

private Category cat;

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

//Setter injection

@Autowired

@Qualifier("comedy")

public void setCat(Category cat) {

this.cat = cat;

}

@Override

public String getCategory() {

return cat.getCategory();

}

@Scope annotation(singleton/prototype)

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ScopeEntertainmentTesting.java
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package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ScopeEntertainmentTesting {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

Movie obj1=context.getBean("bollywood",Movie.class);

boolean result=(obj1==obj);

System.out.println(result);

System.out.println(obj);

System.out.println(obj1);

context.close();

}

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;

@Component("bollywood")

@Scope("singleton")

public class Bollywood implements Movie {

private Category cat;

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

//Setter injection

@Autowired

@Qualifier("comedy")

public void setCat(Category cat) {

this.cat = cat;

}

@Override

public String getCategory() {

return cat.getCategory();

}

Feb 26, 2018 6:44:50 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 18:44:50 IST 2018]; root of context hierarchy

Feb 26, 2018 6:44:50 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

true

com.demo.spring.Bollywood@4de5031f

Feb 26, 2018 6:44:51 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 18:44:50 IST 2018]; root of context hierarchy

package com.demo.spring;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;

@Component("bollywood")

@Scope("prototype")

public class Bollywood implements Movie {

private Category cat;

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

//Setter injection

@Autowired

@Qualifier("comedy")

public void setCat(Category cat) {

this.cat = cat;

}

@Override

public String getCategory() {

return cat.getCategory();

}

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OUTPUT

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Feb 26, 2018 6:45:25 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 18:45:25 IST 2018]; root of context hierarchy

Feb 26, 2018 6:45:25 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

false

com.demo.spring.Bollywood@4de5031f

com.demo.spring.Bollywood@67e2d983

Feb 26, 2018 6:45:25 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@41975e01: startup date [Mon Feb 26 18:45:25 IST 2018]; root of context hierarchy

@postConstruct and @preDestroy annotations

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ScopeEntertainmentTesting .java

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package com.demo.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ScopeEntertainmentTesting {

public static void main(String[] args) {

ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");

Movie obj=context.getBean("bollywood",Movie.class);

/* Movie obj1=context.getBean("bollywood",Movie.class);

boolean result=(obj1==obj);

System.out.println(result);

System.out.println(obj);

System.out.println(obj1);*/

System.out.println(obj.getMovie());

context.close();

}

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Bollywood.java

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package com.demo.spring;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;

import org.springframework.web.bind.annotation.PostMapping;

@Component("bollywood")

//@Scope("prototype")

public class Bollywood implements Movie {

private Category cat;

public Bollywood(){}

@PostConstruct

public void doStart(){

System.out.println("startup");

}

@PreDestroy

public void doFinish(){

System.out.println("Finish");

}

@Override

public String getMovie() {

return "Bollywood id famous for acting and songs";

}

//Setter injection

@Autowired

@Qualifier("comedy")

public void setCat(Category cat) {

this.cat = cat;

}

@Override

public String getCategory() {

return cat.getCategory();

}

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OUTPUT

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Feb 26, 2018 7:32:21 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7dc5e7b4: startup date [Mon Feb 26 19:32:21 IST 2018]; root of context hierarchy

Feb 26, 2018 7:32:21 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

startup

Bollywood id famous for acting and songs

Feb 26, 2018 7:32:21 PM org.springframework.context.support.AbstractApplicationContext doClose

INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@7dc5e7b4: startup date [Mon Feb 26 19:32:21 IST 2018]; root of context hierarchy

Finish

Monday, 26 February 2018

9.0 Practice Project using Spring Annotations

PROJECT TO WORK FOR PRACTICE (DOWNLOAD)

@Component annotation

@Autowired annotation

Constructor injection

@Autowired annotation

Setter injection

@Autowired annotation

method injection

@Autowired annotation

field injection

@Qualifier annotation

@Scope annotation(singleton/prototype)

@postConstruct and @preDestroy annotations

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