Contact us anytime to know more — Amit A., Founder & COO CISIN
Java EE apps are hosted by application servers such as IBM WebSphere, Oracle GlassFish, or Red Hat WildFly that may run in either the cloud or within corporate data centers.
While servers host Java EE applications themselves, clients could include IoT devices, smartphones or RESTful web services with REST APIs as RESTful services, standard web applications with WebSocket connections, or microservices hosted inside Docker containers - depending on client devices being connected by Java EE clients to each application server.
Java Enterprise Edition (also referred to as JEE) is an umbrella term that encompasses several specialized Java specifications and technologies, notably those from both Standard Edition (SE) and Enterprise Editions of the platform.
What Is Java EE?
In its essence, EE stands for Java Enterprise Edition, an upgraded version of SE (Standard Edition). These upgrades add support for enterprise requirements; we will discuss their necessity more later in our next segment.
We will go deeper into understanding EE and why its development should occur.
As part of today's complex and distributed e-business environment, it is critical that enterprise applications reach the market as swiftly as possible.
Your project team cannot afford to waste time with system-level services like remote connectivity or naming; you should instead employ portable and reusable components in your design work.
J2EE addresses this need through its standards-based framework that offers well-documented support to develop and run distributed, multitier applications with componentized architectures using Java technology.
J2EE takes care of many low-level aspects such as remote connectivity/naming/persistent storage/security/transaction management so developers can concentrate solely on business logic development.
The J2EE Platform consists of the following:
- J2EE platforms and components are defined by an established standard set.
- This blueprint describes in great detail both its platform and how best practices should be employed when developing J2EE applications.
- Many companies provide a reference implementation of J2EE as an industry benchmark and contain fully developed sample applications as part of this implementation.
- Compatibility tests to ensure J2EE commercial implementations conform with its specification. Architectural Java EE architecture goals.
- J2EE provides APIs that make using industry best practices and popular design patterns simple and effective.
Java EE Architecture Goals
Java EE provides APIs that make it easy to use industry-recognized best practices and popular design patterns. One of the more difficult challenges enterprise developers must confront when managing web-based clients is managing requests from web clients.
Java EE's Servlet API and JavaServer Pages API make this easier by providing methods for quickly finding out what a person typed into an online form's textbox or saving cookies onto browsers.
How to store and retrieve data from databases is another common task, which Java EE offers an API called Java Persistence API to facilitate.
JPA makes mapping program code into information stored within rows and tables in databases easier, while the Enterprise JavaBeans specification (EJB), used for creating web services and highly scalable logic components, simplifies their creation. These APIs have been extensively tested, are relatively user-friendly for Java developers, and may help address some of the more challenging parts of enterprise development.
Java EE Core Technologies
Java EE Core Technologies With the release of Java EE 8, the number of APIs may increase to over 30, potentially reaching 50 altogether.
These core technology files are generally divided into four categories.
- HTTP Client Technology: Java EE provides a Java API for WebSocket Programming, an API to process JSON, JSF, Servlet, and JSP Standard Tag Library.
- Database Access And Resource Technologies: Java EE provides JavaMail for interacting with back-end and external systems. It also includes a Java Message Service API, a Java Transaction API, and a Java Transaction API to enforce two-phase commits.
- RESTful Web Services: The Java APIs are available for RESTful Web Services, XML Web Services, XML Messaging, and XML Registries.
- Java EE Container Management And Security: Software developers can use the Java Authorization Contract for Containers and the Java Authentication Service Provider Interface for Containers to implement Java EE custom security defenses.
Why Do We Need Java EE?
Java EE incorporates advanced Java specs to meet certain needs; here are three of them which demonstrate why real-time deployment requires it:
The Power Of API Support
Java EE continues to adapt, discovering new ways of improving API support and programming models of its latest applications as well as responding to requests from the developer community worldwide.
Reduce Development Time
Java EE's primary aim was to streamline development time. Starting in Version 5, developers no longer need to use Deployment Descriptors XML documents instead, entering information directly in Java source files with annotations for runtime configuration and deployment through its Server.
Reduce Application Complexity
Developers today recognize the need for transactional, distributed applications that increase server safety and reliability.
Java EE provides enterprise applications designed and produced in ways that reduce complexity by being developed more rapidly with limited resources and in less complex manners.
Performance Of System Applications
Java EE makes enterprise Java Application Development faster or simpler for Java programmers by offering them access to an extensive API set that reduces development times while simplifying applications and increasing application performance.
It has one goal in mind: giving developers what they need in terms of API functionality for rapid app creation and performance enhancements in mobile development.
Continue to gain insights into how Java EE is implemented in real-time. Let's go over various specifications pertaining to its deployment in real-time environments.
Java EE vs. Java SE
These APIs represent only a selection of components available within Java EE that developers may choose from; applications created using it may use any and all APIs offered by Java Standard Edition as part of its core API set and standard Development Kit.
Java EE should not be seen as competing directly against its foundational API set; instead, it extends it with enhanced components built from its foundational set of APIs to form something altogether new: an entirely standardized framework built upon that base API set is more appropriate compared with its counterpart.
Java EE builds upon the foundation laid by Java SE. All Java EE apps run on a java virtual machine supporting the APIs from this edition of Java.
In this post, we'll examine what distinguishes the Standard Edition and Enterprise Edition of this programming language.
Java SE:
- Java SE provides basic functionality, such as defining classes and objects.
- Java SE Standard Specification.
- Java SE includes features such as class libraries and deployment environments.
- Java SE is used for both desktop and mobile applications.
- Java SE is the most popular choice for beginners.
- Java SE is not authenticated.
Java EE:
- Java EE is a Java Application that is aimed at the corporate and high-end market.
- Java EE is a specification that supports Web Applications and Servlets.
- Java EE is a structured application that has layers for clients, businesses, and enterprises.
- Java EE is the main programming tool we use for web development.
- Java EE is the most popular choice for experts.
- Java EE supports authentication.
Developing And Deploying Java EE Applications
The Java server-side development process involves the following:
- Java EE Core technologies: Writing code to use them.
- Compiling the code into bytecode.
- Packing the bytecode, and any resources associated with it, into an Enterprise Archive file (EAR).
- Deploying the EAR on an Application Server.
The JDK includes both a Java compiler and text editor; there's also an extensive ecosystem of integrated development environments (IDEs) available that can assist developers in quickly creating Java EE apps.
Eclipse and Oracle NetBeans IDEs are two popular open-source IDEs for Java EE development, both featuring source code formatting, project organization, and syntax checking functions, as well as extensive plug-in communities that enable users to add extra functionalities into each IDE.
Java EE applications often rely on plug-ins to be constructed, deployed, and continuously integrated. These plug-ins may include those created with Maven Build projects, Gradle deployment software tools, or continuous integration technologies such as Jenkins or Hudson.
Java EE vs. Spring Framework
In December 1999, J2EE became the inaugural standard for enterprise Java development. In this attempt at setting an initial baseline for server-side support, it provided less than 12 APIs which focused mainly on front-end components like Servlets and JSPs, while back-end EJBs provided backbone services for these apps.
J2EE 1.3 was released in September 2001 with incremental enhancements, such as adding the JSF framework. Later in November 2003, J2EE's 1.4 release featured the HTML framework JSF which brought even further benefits.
Developers were critical of Sun Microsystem's J2EE enterprise software approach as too heavy, complex, and academic for everyday applications.
To provide an alternative to J2EE EJBs that had long plagued the J2EE framework, Rod Johnson created Spring Framework as an independent project outside Sun Microsystems; Sun was solely responsible for J2EE framework development at that time.
Spring Framework was initially created as an agile platform for Java enterprise software development. Developers quickly took to adopting its simple approach to application creation.
Java EE 5 With Lightweight EJB Development
Java EE 5 features lightweight EJB development. In May 2006, the change from J2EE to Java EE was implemented alongside the implementation of EJB 3.0 as part of that transition process.
Java EE 5 was announced upon reaching version 5 of JDK; due to this coincidental timing, it became known by this name and included JPA/JAX WS support as part of its offerings.
Read More: Java Application Development: The Strategic Choice For High End Web Apps
Java EE 6 With RESTful Web Services
Java EE 6 introduced RESTful Web Services through its December 2009 release with REST API For RESTful Web Services.
Java EE 6 introduced a feature known as Web Profile, which allowed vendors to build servers that only provided partial Java EE functionality - making distribution simpler across devices with limited computing capacity.
Java EE 6 Web Profile, for instance, required only basic Servlet/JSP support without APIs such as JavaMail or the Java Authentication Service Provider Interface for Containers.
This new approach allowed for its widespread implementation across embedded software and IoT devices.
Java EE 7 & WebSockets
JEE7 was released in June 2013 as an answer to HTML5's popularity and browser support requirements for JEE platforms.
Java APIs were also introduced that simplified WebSocket and JSON Processing, making it simpler for information to be sent back from client devices into server databases in JSON format.
Java EE 8, Cloud Computing, And Containers
The Java Community Process (JCP), which has scheduled its release for late 2017, stated that its Java EE v7 release would feature support for HTML5, and HTTP 2.0 standards, as well as improved simplification, managed bean integration, and infrastructure running applications on cloud platforms.
Java EE 8 will bring with it many exciting new APIs, such as JCache and JSON Binding API. Model-View-Controller will become a web development framework. In addition, several existing APIs, like WebSocket API and JSF, will be updated; JPA (Batch Applications API), Batch Applications API, and the JSON Binding APIs will also receive improvements.
Java EE Specification
Java EE Specification There are multiple Java EE specifications, each offering reading and writing functionality as well as database management, transaction processing, and web page creation capabilities.
Here we present four versions of this technology:
Enterprise Specification
- Context Injection and Dependency Injection: The software container created to enable the injection of dependencies into Swing is included in the Java Enterprise Edition.
- Java Enterprise Java Bean: These APIs are executed by an object container to provide transactions, remote procedure calls, and concurrency controls.
- Java Persistence Interface: Persistence interfaces specify the object-relational mapping of relational database tables to Java classes.
- Java Transaction Interface: Transaction interfaces and annotations are used to create interaction between Java EE transaction support.
Web Specification
- Java Serverlet: JavaServlet specifies how HTTP requests can be managed synchronously and asynchronously.
- Web Socket: Java WebSocket protocol is a communication standard. Web socket API is a set of APIs that facilitate WebSocket connection.
- Java Server Faces: Java Server Faces is a service that helps in building GUIs out of server components.
- Unified Expression Language: Unified Expression Language was designed specifically to help web application developers.
Web Service Specifications
- RESTful web services: RESTful HTTP, an API Web service, helps to provide services with Representational State Transfer Schema.
- JSON Process: JSON processing is a set of specifications that manages information in JSON format.
- JSON binding: JSON binding is a set of specifications that are used to parse or bind a JSON into Java classes.
- XML binding: JSON binding allows binding XML to Java objects.
Other Specifications
- Validation: The Validation Package contains various interfaces, annotations, and declarative validation support provided by Bean Validation API.
- Batch Application: The Validation Package contains various interfaces, annotations, and declarative validation support provided by Bean Validation API.
- Java Ee Connectors: Java Ee Connector is a Java-based technology solution that connects Java servers with Enterprise Information Systems.
Java EE will now be able to understand the minimum requirements for our local system.
System Requirements
You will need the following hardware to install Java EE:
- JVM Standard Edition 6.
- Windows / Linux Operating System.
- 1 GB RAM.
- 250 GB of ROM Space.
- Java Web Development Kit.
We will learn about the Hardware Specification and then how to install Java EE in our local environment.
J2EE Application Stages
This section explains the stages of J2EE development as specified in the J2EE specifications. The stages of development are:
Component Development
- J2EE Application Client Creation.
- Web Component Creation.
- Enterprise JavaBean Creation.
- J2EE Application Assembly.
- J2EE Application deployment.
At least one component development stage is needed for a J2EE application. All J2EE applications need to be deployed and assembled, so the final two stages will always be required.
The below summarizes the stages of development for J2EE applications:
J2EE Client Creation:
- Writes client code, compiles classes.
- Creates the application-client.xml deployment descriptor.
- Creates a JAR archive containing Class and XML files.
Web Component Creation:
- Writes servlet and compiles class.
- Create JSP and HTML Pages.
- Creates the Web.xml Deployment Descriptor.
- Creates a Web Application Archive file (WAR) containing Class,.jsp, and.html files.
Enterprise JavaBean Creation:
- Write EJB and compile class.
- Create the ejb.jar.xml deployment descriptors and server-specific ones.
- Create a JAR archive containing Class and XML Files.
J2EE Application Assembly:
- Create the application.xml descriptor.
- Create an EAR file containing EJBs, Web components (WAR), XML files, and Web components.
J2EE App Deployment:
- Add the J2EE Application (EAR) to J2EE Server Environment.
- Edit the application.xml descriptor to include the local environment configuration.
- Deploying the J2EE application on the J2EE Server.
Each stage produces a deliverable which is then used in the following stage. The components developed in the component development stages are used to create the J2EE Application Assembly phase, which produces the J2EE Application EAR archive.
The J2EE application deployment stage is where the EAR archive will be deployed to the J2EE Server.
The deliverables of each stage can be done by different people or in different environments as long as they meet the J2EE Platform's requirements.
How Do We Set Up The Java EE Environment?
Follow the steps below to install the Java EE Environment on our Windows Operating System.
- Visit the Oracle Java website.
- Java SE Development Kit.
- Accept the License Terms.
- Download the JDK File.
- Run JDK with Administrator.
- Install Java Environment.
Conclusion:
Next up, you should be reading "Exception Handling," an essential pre-reading before beginning programming in Java.
It teaches how to manage errors and exceptions when working in real-time with J2EE applications similar to operating system services on your PC without worrying about low-level issues like disk access, memory management, video output, or networking issues only paying attention to specific requirements related to your applications vs. system details. J2EE Platform supports enterprise applications.
Use of the J2EE Platform can streamline development efforts, so your dedicated team can spend their time on app-related logic rather than system issues, leading to bug-free systems which meet users' requirements in terms of time and functionality for developing J2EE based Software Development with the help of CISIN developer team.
