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Gunjan Shukla
Gunjan Shukla

How to Build and Deploy Cloud-Native Apps with Open Liberty


How to Download Open Liberty




Are you looking for a lightweight open framework for building fast and efficient cloud-native Java microservices? If so, you might want to check out Open Liberty, an open source project that provides a flexible and modular server runtime for Java developers. In this article, we will show you how to download Open Liberty and get started with developing, deploying, and monitoring your microservices in any cloud environment.




download open liberty


Download File: https://www.google.com/url?q=https%3A%2F%2Ft.co%2FkJvDRkDitL&sa=D&sntz=1&usg=AOvVaw0P_gQ93oeb736qb96lwTmg



What is Open Liberty?




Open Liberty is an open framework for the Java ecosystem that allows developing microservices using features of the Eclipse MicroProfile and Jakarta EE platforms. It is a flexible, fast, and lightweight Java runtime that seems promising for cloud-native microservices development. The framework allows you to configure only the features your app needs, resulting in a smaller memory footprint during startup. Also, it is deployable on any cloud platform using containers like Docker and Kubernetes. It supports rapid development by live reloading of the code for quick iteration. It also offers zero migration, meaning that you can focus on what's important, not the APIs changing under you.


Why use Open Liberty?




There are many reasons why Open Liberty is an ideal choice for developing and deploying microservices. Here are some of them:


  • It is open source and community-driven, so you can benefit from the latest innovations and best practices.



  • It is compatible with the latest standards and APIs, such as Jakarta EE 9 and MicroProfile 5.



  • It is modular and flexible, so you can add or remove features as needed.



  • It is fast and lightweight, so you can start up quickly and use less resources.



  • It is cloud-native and container-friendly, so you can deploy and scale easily on any cloud.



  • It is developer-friendly and productive, so you can code faster and test easier.



Prerequisites




To download and use Open Liberty, you need to have the following prerequisites:


  • A Java Development Kit (JDK) version 8 or higher.



  • A build tool such as Maven or Gradle.



  • A code editor or IDE such as Eclipse or Visual Studio Code.



  • A Docker engine if you want to use Docker containers.



  • A Kubernetes cluster if you want to use Kubernetes orchestration.



Get Started with Open Liberty




There are three ways to get started with Open Liberty: create a starter application, add to an existing application, or download package.


Create a starter application




The easiest way to create a starter application for developing cloud-native Java applications on Open Liberty that use Jakarta EE and MicroProfile APIs is to use the . This tool allows you to select the development tools that you prefer to use, such as Maven or Gradle, Java SE version, Jakarta EE and MicroProfile versions, and the features that you want to include in your application. Then, you can download a zip file that contains the starter project, which you can import into your code editor or IDE and start coding.


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Add to an existing application




If you already have an existing Java application that you want to run on Open Liberty, you can add the Open Liberty Maven Plugin or Gradle Plugin to your project's build file. These plugins allow you to easily build, test, and deploy your application on Open Liberty. They also provide a dev mode that enables hot reload and deployment, unit testing, integration testing, and debugging.


Download package




If you want to download the Open Liberty runtime package directly, you can go to the page and choose the package that suits your needs. There are different types of packages available, such as:


  • Open Liberty Runtime: This is the core runtime package that contains the Open Liberty server and the default features.



  • All GA Features: This is an extended runtime package that contains all the features that are generally available for production use.



  • Java EE 8 Web Profile: This is a runtime package that contains only the features required for the Java EE 8 Web Profile specification.



  • Java EE 8 Full Platform: This is a runtime package that contains all the features required for the Java EE 8 Full Platform specification.



After downloading the package, you can unzip it and start using the Open Liberty server.


Develop Cloud-Native Java Microservices with Open Liberty




Once you have downloaded Open Liberty and created or added your application, you can start developing cloud-native Java microservices using the features of Jakarta EE and MicroProfile. Here are some tips on how to use these features effectively:


Use features




Open Liberty features are modular components that provide specific functionality for your application. For example, there are features for web applications, RESTful services, security, persistence, messaging, fault tolerance, health checks, metrics, and more. You can enable or disable features by adding or removing them from your server.xml configuration file. For example, if you want to use CDI, JAX-RS, JSON-P, and JSON-B in your application, you can add the following feature to your server.xml:



cdi-2.0


jaxrs-2.1


jsonp-1.1


jsonb-1.0


You can also use convenience features that group together related features for easier configuration. For example, if you want to use all the features required for the Jakarta EE 8 Web Profile specification, you can add the following feature to your server.xml:



webProfile-8.0


Use convenience features




Open Liberty also provides convenience features that simplify the development and testing of your application. For example, there are convenience features for:


  • Servlet: This feature enables servlet support and automatically adds features such as CDI, JSP, EL, and JSF.



  • JDBC: This feature enables JDBC support and automatically adds features such as connection pooling and transaction management.



  • JPA: This feature enables JPA support and automatically adds features such as persistence providers and bean validation.



  • Jakarta RESTful Web Services: This feature enables JAX-RS support and automatically adds features such as JSON-P and JSON-B.



  • Jakarta Contexts and Dependency Injection: This feature enables CDI support and automatically adds features such as interceptors and decorators.



  • Jakarta Authorization: This feature enables authorization support and automatically adds features such as security annotations and role mapping.



  • Jakarta Authentication: This feature enables authentication support and automatically adds features such as security annotations and identity stores.



  • Jakarta Batch: This feature enables batch processing support and automatically adds features such as job operators and listeners.



  • Jakarta Bean Validation: This feature enables bean validation support and automatically adds features such as validation providers and constraints.



  • Jakarta Enterprise Beans: This feature enables EJB support and automatically adds features such as timers and remote interfaces.



Jakarta Expression Language: This feature enables EL support and automatically adds features such as lambda expressions and collec


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