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2. Spring Core 3. Spring IoC Container

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The Spring Container The container will: create the objects wire them together configure them manage their complete lifecycle from creation till destruction. These objects are called Spring Beans

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Dependency Injection The Spring container uses dependency injection (DI) to manage the components In a complex Java application classes should be as independent as possible to increase the possibility to reuse these classes and to test them independently Dependency Injection helps in connecting these classes together and same time keeping them independent.

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DI Implementation

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Container’s Metadata The container gets its instructions on what objects to instantiate, configure, and assemble by reading configuration metadata provided: by XML Java annotations Java code

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How Spring Works

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Spring Bean Definition The objects that form the backbone of your application and that are managed by the Spring IoC container are called beans The bean definition contains the information called configuration metadata which is needed for the container to know: How to create a bean Bean's lifecycle details Bean's dependencies

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XML Metadata

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Spring Bean Definition Each bean definition can contain a set of the following properties: Class Name Scope constructor-arg Properties autowiring mode lazy-initialization mode initialization method destruction method

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Bean Definition Attributes Class attribute is mandatory and specify the bean class to be used to create the bean Name attribute specifies the bean identifier uniquely. In XML-based configuration metadata, you use the id and/or name attributes to specify the bean identifier(s) Properties is used to inject the dependencies

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Spring Tool Suite Installation Open Eclipse -> Help -> Eclipse Marketplace… Find = STS -> click Find button -> select STS for Eclipse Luna -> Install button -> Confirm -> I accept -> Finish Restart Eclipse

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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Example 1. Create Spring Project File -> New -> Other.. -> Spring -> Spring project -> Next Project name = P211BeanDefinition, Templates = Simple Spring Utility Project -> Next Package = com.bionic.edu -> Finish

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Example 1. Create Spring Project Remove from com.bionic.edu package (src/main/java) template files Service.java and ExampleService.java Remove from com.bionic.edu package (src/test/java) template files ExampleConfigurationTests.java and ExampleServiceTests.java

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Example 1. Logging Dependencies

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Add Dependencies to the pom.xml File Open pom.xml -> Dependencies tab -> select junit: 3.8.1[test] -> Properties -> change version to 4.7 -> Ok Press Add button -> GroupId = org.slf4j, ArifactId = slf4j-api, Vesion = 1.7.5 -> Ok Press Add button -> GroupId = org.apache. logging.log4j, ArtifactId = log4j-api, Version = 2.0.2 -> Ok And so on… Then -> Save

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Further pom.xml Tuning Select log4j (1.2.14) dependency and click Remove button Go to pom.xml tag and change 1.5 Java version to 1.8 both in and tags of maven-compiler-plugin artefact Change Spring version to 4.1.1.RELEASE in tag Save pom.xml file

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Maven clean&install actions Right click on the project’s name -> Maven -> Update project -> Ok Right click on the project’s name -> Run As… -> Maven clean Right click on the project’s name -> Run As… -> Maven install

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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Example 1. log4j2.xml in resources

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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E1. GreetingService Interface package com.bionic.edu; public interface GreetingService { void sendGreeting(); }

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E1. HelloWorldService Class package com.bionic.edu; public class HelloWorldService implements GreetingService { public void sendGreeting() { System.out.println("Hello, world!"); } }

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E1. HelloKittyService Class package com.bionic.edu; public class HelloKittyService implements GreetingService { public void sendGreeting(){ System.out.println("Hello, Kitty!"); } }

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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Bean Definition The element tells Spring to create an object for you. The id attribute gives the bean a name by which it’ll be referred to in the Spring container. When the Spring container loads its beans, it’ll instantiate the bean using the default constructor.

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Example 1. Bean Definition

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Example 1. Configuration File Right click on src/main/resources -> New -> File Fill File name with configuration file Id (beans.xml) -> Finish Create configuration file context (see next slide) -> Save

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Example 1. Configuration File

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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Application Context You can load the Spring application context using the following code: ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); GreetingService service = (GreetingService)ctx.getBean("helloWorldService"); service.sendGreeting();

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Example 1. Application Class package com.bionic.edu; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Application { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); GreetingService service = (GreetingService)ctx.getBean("helloWorldService"); service.sendGreeting(); } }

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Example 1. Hello World in Spring Create Spring project Tune project for logging Create project classes (POJOs) Create Spring metadata Create application context Run application

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Example 1. Run application. You will get Hello, world! See P211BeanDefinition project for the full text

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Injecting through Constructors A class can be constructed in two different ways: Using the default constructor Using a constructor that takes an argument(s) If no are given in a bean definition, the default constructor is used. A with a value attribute leads to the other constructor will be used instead.

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Example 2. HelloWorldService package com.bionic.edu; public class HelloWorldService implements GreetingService { public String message; public HelloWorldService(){ message = ""; } public HelloWorldService(String message){ this.message = message; } public void sendGreeting() { System.out.println("Hello, world! " + message); } }

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Example 2. Bean Definition

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Example 2. Run application. You will get Hello, world! I am Victor. See P212ConstructorInjection project for the full text

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Injecting Object References You should use ref attribute in a for passing references to other beans

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Example 3. Application Class public class Application { GreetingService greeting = null; public Application(){} public Application(GreetingService greeting){ this.greeting = greeting; } public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); Application application = (Application)ctx.getBean("application"); application.start(); } public void start(){ if (greeting != null) greeting.sendGreeting(); } }

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Example 3. Bean Definition

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Example 3 Output Hello, world! I am Victor.

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Example 3. Bean Definition

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Example 3 Output Hello, Kitty! See P213ConstructorInjection project for the full text

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Property Tags You can use tag to pass the values of different variables used at the time of object creation is similar to in many ways, except that instead of injecting values through a constructor argument, injects by calling a property’s setter method.

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Example 4. Simple Value Injection Add accessor to HelloWorldService class Change beans.xml as follows

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Example 4. Output Hello, world! I am Victor. See P214PropertySimple project for the full text

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Simple Value Injection isn’t limited to injecting String values The value attribute can also specify numeric (int, float, java.lang.Double, and so on) values as well as boolean values

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Example 5. Numeric Injection public class HelloWorldService implements GreetingService { public String message; public int repeat; // constructors, getters&setters public void sendGreeting() { for (int i = 0; i < repeat; i++){ System.out.println("Hello, world! " + message); } }}

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Example 5. beans.xml

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Example 5. Output Hello, world! I am Victor. Hello, world! I am Victor. Hello, world! I am Victor. See P215NumericInjection project for the full text

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Object Injection The real value of DI is found in wiring an application’s collaborating objects together so that they don’t have to wire themselves together Use ref attribute of tag for this purpose

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Example 5. Reference Injection Add getter&setter for greeting field of Application class Change beans.xml as follows

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Example 5. Output Hello, Kitty!

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Example 5. Bean.xml Changes

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Example 5. Output Hello, world! I am Victor. See P216PropertyRef project for the full text

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Auto Wiring In large applications, the number of beans will increase and the corresponding XML written to configure the numerous beans will become very large Spring provides a feature called 'Auto-Wiring' that minimizes the XML to be written provided that certain assumptions are made about the nomenclature of beans and properties Spring provides auto-wiring based on both XML and Annotations

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Auto-Wiring based on Annotations Use the tag in spring-context.xml Use the @Inject annotation to qualify either the member or a corresponding method (usually the setter method) which takes the injected type as argument

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The @Inject annotation The @Inject annotation can be used to qualify: a member any method (including setter method) which takes the injected type as argument

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Autodiscovery By default, looks for classes that are annotated as: @Component - indicates that the class is a Spring component @Controller - indicates that the class defines a Spring MVC controller @Repository - the class defines a data repository @Service - the class defines a service Any custom annotation that is itself annotated with @Component

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@Component vs @Named @Named and @Component annotations are used enabling a class to be auto detected as the bean definition for spring’s application context @Named is part of the Java specification JSR-330. It is more recommended since this annotation is not tied to Spring APIs. @Component is part of the Spring’s annotations library.

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Example 6. Annotations Create Spring project with name P221FirstInject Tune pom.xml file Tune beans.xnm file Create application classes Run application

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Example 6. pom.xml Add the following dependency to the project’s pom.xml file: javax.inject javax.inject 1

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Example 6. beans.xml Create the following beans.xml file:

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Example 6. HelloWorldService package com.bionic.edu; import javax.inject.Named; @Named public class HelloWorldService implements GreetingService { public String message; public int repeat; . . . . . . . . . . . . . . . . public void sendGreeting() { for (int i = 0; i < repeat; i++){ System.out.println("Hello, world! " + message); } } }

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Example 6. Application Class @Named public class Application { @Inject GreetingService greeting = null; . . . . . . . . . . . . . . . . public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); Application application = (Application)ctx.getBean("application"); application.start(); } public void start(){ if (greeting != null) greeting.sendGreeting(); }}

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Example 6. Output Hello, world! See P221FirstInject project for the full text

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Example 7. Autowiring by Name Annotate HelloKittyService class with @Named: package com.bionic.edu; import javax.inject.Named; @Named public class HelloKittyService implements GreetingService { public void sendGreeting(){ System.out.println("Hello, Kitty!"); } }

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Example 7. Output Running the application leads to an exception Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'application': Injection of autowired dependencies failed; . . . . . . . . . No unique bean of type [com.bionic.edu.GreetingService] is defined: expected single matching bean but found 2: [helloKittyService, helloWorldService]

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The @Named Annotation If multiple bean types are available for injection, then Spring will be unable to make a decision on which bean to inject and will throw an Exception In such cases, we can use the @Named(name="..") annotation and give the name of the bean that we want Spring to inject.

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Example 7. @Named Annotation @Named public class Application { @Inject @Named("helloWorldService") GreetingService greeting = null; . . . . . . . . . . . . . . . . public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); Application application = (Application)ctx.getBean("application"); application.start(); } . . . . . . . . . . . . . . . .

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Example 7. Output Hello, world!

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Example 7. @Named Annotation @Named public class Application { @Inject @Named("helloKittyService") GreetingService greeting = null; . . . . . . . . . . . . . . . . public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); Application application = (Application)ctx.getBean("application"); application.start(); } . . . . . . . . . . . . . . . .