Dependency Injection for Java Developers

Install and set up the Java Development Kit 8 by downloading the appropriate Windows, Mac OSX, or Linux installer, accepting the license, and following platform-specific guidance.

Install NetBeans IDE 8.2 from netbeans.org and download the bundled package for Java enterprise development. Follow the Windows install, ensure Java is installed, and import sample code for setup.

Explore how Apache Maven streamlines dependency management for Java projects, and learn how to install and configure Maven across Windows and Linux using pre-built binaries.

Explore git, a distributed control system, and learn its productive workflow with guidance for installing on Windows, macOS, and Linux.

Explore the theoretical overview of the Java platform and Java EE, its evolution, and who is responsible for it, while dispelling myths about dependency injection and inviting developer contribution.

Explore Java EE as a collection of abstract specifications and interfaces that standardize solutions for enterprise software challenges, including data persistence via the entity manager interface.

Explore open standards and standardized specifications that define Java EE, and learn how abstract specs become concrete implementations that run your application across platforms.

Explore how Java EE defines a complete set of standards with concrete reference implementations like GlassFish, and how application servers implement APIs such as Hibernate and RESTful web services.

Identify why every gesture must come with a reference implementation, illustrated by the umbrella and its collection.

Explore how Java EE is defined as an open standard via the Java Community Process, with specifications and reference implementations that go through transparent voting and expert review.

Java EE is framed as an open, standardized platform governed by the Java community process, where individuals join the JCP, vote, and provide feedback to shape Java standards.

Explore what Java EE is as an umbrella platform with a reference implementation in the form of gas, and learn to submit feedback and issues on the DCP website.

Understand the finalized Java platform and the next major Java EE release, expected between May and the end of 2017, and its availability.

Register for the first project by joining the GCP associate member on the website hippie dot org, sign forms electronically, and begin the project workflow.

Explore what dependency injection is, why Java developers should use it, and how it relates to control, as the course introduces the technique and sets the stage for future chapters.

Use dependency injection to implement inversion of control by letting a container supply dependencies. The kitchen versus restaurant analogy shows how the container hands services to your application.

Understand how dependency injection, a specific form of inversion of control, externalizes the management of application dependencies to a centralized container or framework.

Explore what dependency injection is, an inversion of control where a container manages application dependencies, enabling declarative requests for needed components and the framework to instantiate and inject them.

Explore the four CDI features—lifecycle, context events, interceptors, and producers—that simplify dependency management for Java developers and enable scalable, adaptable applications with easy component substitution.

Explore lifecycle contexts in dependency injection by binding components to sessions or views, ensuring they survive user interactions and get garbage collected when their context ends.

Explore typesafe dependency injection and its type-based lookups, enabling easy refactoring and reconfiguring of Java applications while maintaining dependency clarity.

CDI provides interceptors and decorators to handle cross-cutting concerns; interceptors run logic before and after method calls and proceed to the original method, while decorators implement business logic.

Learn how CDI events enable decoupled components through declarative observers, where an observer method is invoked automatically when an event occurs and can receive event data.

Explore how the service provider interface enables event-based integration and CDI extensions, with examples like CGI extensions and Apache-inspired ideas that connect applications using CDI.

Introduce the lifecycle context and events within a context-independent framework called leaves for Java developers exploring dependency injection. Connect theory to practical setup and software needed to run the course.

this lecture outlines prerequisite software for Java dependency injection, including downloading the Oracle platform, choosing a supported OS, and installing an IDE such as IntelliJ IDEA and GlassFish application server.

Explore how each concept in this course branches into project-specific examples, making topics like events, requests, and scopes easy to follow for Java developers.

Engage actively in this practical course on dependency injection for Java developers, clone the project, study the code samples, and ask questions in forums to deepen understanding of context.

Explore how context and dependency injection (CDI) binds Java EE components, with CDI enabled by default to empower the Java platform and EJB integration.

Declare that your application depends on the Java EE API to enable CDI by default, then use context and dependency injection on the Java platform.

Learn how CDI bean discovery scans your application at startup to identify beans for dependency injection, including modes such as all, annotated, and none, and the role of scope annotations.

Explore CDI bean discovery modes in Java development, including how CDI scans archives for beans using annotations and how default discovery affects which beans are managed.

The CDI container is the central black-box factory that manages object creation, injection, and lifecycle, validating rules at startup to prevent runtime errors.

Set up a Java 7 project and declare a CDI dependency with provided scope. Learn to work with CDI managed beans and a reference implementation inside a container.

Explore beans and contextual instances in dependency injection, showing how a plain old Java object annotated as a bean becomes a managed, context-driven component with injection.

Learn CDI field injection in Java from the Dependency Injection for Java Developers course, and see how a container injects into a class field within a context.

master CDI constructor injection by analyzing injection points, including private and public constructors, and use the container to perform startup initialization in a class.

Explore CDI injection points, focusing on method injection where a method’s parameters are injection points wired by the CDI container, and review the three CDI injection points.

This lecture covers CDI managed beans, distinguishes concrete and abstract classes, and requires a default or injection-point constructor with at least one injection point in a container-managed lifecycle.

Explore how a bean type encompasses its superclasses and interfaces, and how the injection point resolves the correct bean among types. Learn about conflicts and injections by property or method.

Explore how CDI manages beans, including session beans and EJB-style injection, with stateless and singleton scopes and application-wide access via injection points.

Explore CDI lifecycle callbacks and PostConstruct, enabling initialization after injection and before use. See how a PostConstruct method runs once a bean is fully created to prepare data and state.

Explore CDI lifecycle callbacks with PreDestroy, which allows you to release resources and perform cleanup just before a container destroys a bean, helping prevent memory leaks.

Examine interceptor lifecycle callbacks in dependency injection, detailing how interceptors access the evocation context and how the container controls initialization and destruction of lifecycle methods.

Review how dependency injection works by default with CDI, explore default discovery modes, and examine beans and lifecycle callbacks that power Java applications.

Explore how to read the Java EE API documentation to locate injection points in CDI, and how access modifiers affect injectable constructors, methods, and fields.

Learn how CDI qualifiers disambiguate dependency injection by tagging interface implementations, resolve runtime ambiguity, and ensure the correct bean is injected when multiple candidates exist.

Discover how CDI qualifiers resolve ambiguity in dependency injection by using interface implementations, session beans, and annotation qualifiers to inject the correct bean.

Explore CDI qualifiers through the API documentation to identify qualified types, restrict which types are used with qualifiers, and pinpoint specific events on a service to avoid ambiguity.

Explore how CDI qualifiers with value resolve ambiguity among injection points by selecting specific beans, demonstrated through service and soldier examples and qualified injections.

Explore how stereotypes centralize repetitive CDI annotations by defining a stereotype interface and applying it to injections, qualifiers, and scopes to simplify Java dependency injection.

Explore the CDI built-in qualifier @Named and how to name and access beans in Java applications, using named annotations to inject specific beans by name.

Explore the CDI built-in qualifier @Default and how it defines the default context for injection when no explicit qualifier is declared at injection points.

Explore the CDI built-in qualifier @Any and how qualifiers affect injection points, including cases where qualification occurs even if not explicitly declared.

Explore CDI contexts as lifecycles managed by the container. Learn the five CDI contexts and how they shape application context lifespans and garbage collection.

Explore how CDI session scope preserves bean instances for the entire server session, from the first request to the session end, and how it persists across requests within that session.

Examine CDI contexts and the request scope to understand how dependency injection behaves for Java developers.

Explore CDI contexts and the dependent scope, showing how a context's scope is inherited when injected, effectively creating a pseudo scope within its injection context.

Explore the CDI conversation scope as a mechanism for implementing long-running client-server conversations across multiple requests, distinct from session scope, that begin and end at a defined point.

Examine CDI application scope, a long-lived context created at startup, destroyed at shutdown, and shared across the entire application for the full lifecycle.

Explore CDI contexts and the stateless EJB scope, including the three scopes, where a stateless EJB is created per request, does not retain state, and is destroyed after each invocation.

Explore CDI contexts for stateful EJBs, showing how a stateful EJB keeps state across invocations, enabling memory of past actions as the container manages it.

Explore CDI producers in Java: create producer methods that supply a list of strings (dishes) at runtime, inject them into components, and understand container linking and simple scope behavior.

Explore CDI producers and the dependent scope, see how injection points determine runtime behavior, and learn how compile-time knowledge and dynamic naming empower flexible object creation.

Review dependency injection concepts for Java developers, covering qualifiers and stereotypes, context, request scope, producers, and object composition with managed instances.

Learn how CDI interceptors implement cross-cutting concerns (logging and security audits) by intercepting method calls, using an invocation context to proceed or deny the invocation.

Learn how CDI interceptors weave cross-cutting logic in Java by using around invoke, invocation context, and proceed to control method execution with minimal compile-time coupling.

Explore the CDI interceptors API to intercept business method invocations with around advice, retrieve the invocation context, and manage parameters, exceptions, and control the proceed flow.

Explore how CDI events in Java enable decoupled components to synchronize data in real time using a payload and an event interface, with methods that define the event.

Learn how CDI events enable firing payloads via a runtime-provided event interface, using generics to observe and route data like login and location across the app.

Explore how CDI events dispatch payloads to observers, use qualifiers to target specific events, and support multi-parameter observer methods for reactive applications.

Define conditional CDI events and observers that fire only under specific conditions, using qualifiers to control invocation and integrating events with transaction lifecycle points before, during, and after completion.

Explore CDI events and their API documentation by examining the event interface. Understand payload types, observers, and qualifiers like the default qualifier in type-safe injections.

Explore CDI events and API documentation by examining event types, qualifiers, and parameters in Java, highlighting how two events on the Java platform interact through public interfaces.

Run the code sample to demonstrate dependency injection contexts, showing how four school components are created with request, session, and application lifetimes and injected into the running app.

Explore how contexts behave under session scope and application scope in running code samples, showing how the same components differ across session and lifetime applications.

See a code sample running a producer in dependency injection, where a list is created and injected into a class via a container to produce random items.

Explore how qualifiers and annotations govern which components are selected in a running code sample, and observe qualifier usage, calls, and assignments.

This lecture shows how interceptors in Java dependency injection handle crosscutting concerns by intercepting method calls, locking data, and managing session and request lifecycles with post construct callbacks.

Developers explore a code sample to demonstrate event-driven behavior in dependency injection. The lecture shows firing and observing events, with decoupled beans enabling maintainable and testable applications.

Discover how CDI (contexts and dependency injection) binds the CDI API to the platform, and read code to understand its use, enabling portable, decoupled Java applications.

Trace how Oracle opened Java governance, moved to the Eclipse Foundation, and rebranded to Jakarta EE, enabling community-driven, interoperable Java ecosystem growth.

Jakarta EE shifts governance from the Java Community Process to the Eclipse Foundation's working group, enabling cloud-native Java through open collaboration, broad IP rights, and vendor neutrality.

subscribe to the jakarta community mailing list to read lively discussions about jakarta's future, access the web archive, and contribute to shaping jakarta's direction.

Discover Java EE 8 introduction, download the SDK, and learn how GlassFish serves as the reference implementation for Java EE in production use.

Hit the download button to obtain the GlassFish 5 reference implementation, accept the license, download the zip, extract it, and add it to NetBeans IDE to run the web profile.

Add glassfish 5 to the NetBeans IDE by downloading the glassfish zip, extracting it to a location, and configuring NetBeans to point to that glassfish directory, then finish the setup.

Upgrade your project by integrating the dependency declaration and artifacts for Java EE 8, enabling seamless use of the newly released features.

Discover CDI 2.0 primer, covering asynchronous events, event observers, and a major CDI API overhaul, with easy bootstrapping in Java SE without an application server.

Explains how synchronous events pause execution to simulate long-running tasks, showing event firing and logging within a Java dependency injection context.

Demonstrate synchronous event handling in a dependency injection context by firing events, observing handlers, simulating a six-second long task, and measuring execution time to illustrate blocking behavior.

Run a sample Java project to observe synchronous events in a dependency injection setup, using GlassFish and beans, and compare with the asynchronous events API.

Watch how running the sample code triggers a page event, measures the time on the server, and redeploys to repeat the synchronous operations in seconds.

Explore synchronous events and how code runs on a single thread, contrasted with asynchronous events on separate threads, including callbacks and long running tasks.

Explore the difference between synchronous and asynchronous events, showing how async events fire on a separate thread, return immediately, and use a completion stage to handle results.

Explore asynchronous events with a sync observer, where a long-running task runs on a different thread and the original thread resumes where it left off.

Demonstrate asynchronous events in Java by using an async observer and injected event interface to fire non-blocking events, showing immediate continuation even during a simulated long task.

Explore how Payara Micro provides a slim cloud-ready runtime that implements the eclipse micro profile specification and runs as a Java job, enabling embedding or standalone deployment for microservices.

Package your Java EE web application as a war and deploy it to Payara Micro via the command line, then verify the deployed app in the browser.

Learn Java EE testing with Arquillian and JUnit by configuring dependencies in the project, using a managed container, and running tests that exercise application components inside the container.

Explore the Arquillian website to learn about its testing framework, see how to set up tests, and identify regressions in CI/CD workflows.

Test Java applications with Arquillian by packaging components into a deployable archive, deploying to a real container, and validating injections, qualifiers, and unit behaviors.

Run and verify Java tests with Arquillian against an embedded container, using CDI with qualifiers to ensure correct injection, and observe test results to validate builds.

Demonstrates testing a Java dependency injection component with Arquillian, injecting components, using qualifiers, and validating a soldier greeting outcome.

Learn how to validate dependency injection in Java with Arquillian by running tests, deliberately failing them to verify injections, and interpreting results to ensure code behavior.