JakartaEE- vendor neutral

Annotation + Java code = Managed component

JSF- MVC framework - component oriented

-Facelets for templating and composite components

-for developing server side UI in JavaEE

-Data, event binding to CDI visa EL

CDI- context dependency Injection similar to spring core- used for dependency injection

main annotations- @Named,( @Default, @Alternative) , @Inject, @Produces

=> It allows us to manage the lifecycle of stateful components via domain-specific lifecycle contexts and inject components (services) into client objects in a type-safe way.

=> CDI turns DI into a no-brainer process, boiled down to just decorating the service classes with a few simple annotations, and defining the corresponding injection points in the client classes.

• Basic Injection- @Inject, @Qualifier, @Stereotype, @Named, @Produces, @Disposes

=> First, we must place a “beans.xml” file in the “src/main/resources/META-INF/” folder. Even if this file doesn't contain any specific DI directives at all, it's required for getting CDI up and running:

use beans.xml with bean-discovery-mode= "all"

• managed bean- @Dependent

• to use these bean @Inject with constructor injection. it's also possible to inject a service by using the @Inject annotation in fields (field injection) and setters (setter injection)

@Inject == @Autowired

@Inject can be used to inject EJB beans or CDI managed beans or produced beans.

• Context management-@RequestScoped , @SessionScoped, @ApplicationScoped, @ViewScoped, @TransactionScoped , @FlowScoped

• Lightweight events -Events, @Observes

• Interceptors/Decorators- @Interceptor , @Decorator

• Improved testability - Arquillian

=> Weld is the reference implementation of CDI: Contexts and Dependency Injection for the Java EE Platform

web profile- servlet and EJB 3.2

https://www.baeldung.com/java-ee-cdi

we can very easily swap the run-time injection of implementations by simply switching the @Alternative annotations in the service classes.

CDI also allows us to perform service injection with the @Named annotation.

This method provides a more semantic way of injecting services, by binding a meaningful name to an implementation

@Named- provides name to a java component

@Produces - is like @Bean annotation of spring. We don't need to put like @Configuation on factory classes in which these objects are created.

CDI supports the use of custom qualifiers using @Qualifier for qualifying dependencies and solving ambiguous injection points.

cdi-portable-extension

https://www.baeldung.com/cdi-portable-extension

cdi-event-notification

https://www.baeldung.com/cdi-event-notification

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JAXB- for xml to pojo binding

• intelligent defaults and convention-over-configuration

Servlet- to communicate with HTTP

JMS 2 Websocket support JOSN uspport- json-p, json-b

JPA- @Transactional

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Resources:

Concepts: https://learning.oreilly.com/videos/modern-java-ee/9781491941621/9781491941621-video234850

detailed: https://learning.oreilly.com/videos/learning-java-ee/9781788831130/9781788831130-video1_2

with baeldung examples: https://learning.oreilly.com/videos/java-ee-8/9781788622189/9781788622189-video1_6