awesome-kubernetes/docs/java_frameworks.md

Java and Java Programming Models. Open Source Microservices Frameworks

• Java
  • How to migrate Java workloads to containers
  • Existing Java Implementations
  • Use Java 11
  • Java Collections Interview Questions
• Java Programming Models (Frameworks)
• Jakarta EE
• Eclipse MicroProfile
  • Server Vendors providing MicroProfile runtimes
• Spring
  • SpringBoot
    • SpringBoot with Docker
    • SpringBoot Tools
      • Demos
    • Spring Cloud
      • Spring Cloud Kubernetes
      • Spring Cloud Config and Spring Cloud Config Server
      • Secure Secrets with Spring Cloud Vault and alternatives
• Quarkus
• Kogito cloud-native business automation framework
• Thorntail (aka WildFly Swarm)
• Spring Boot VS MicroProfile
• Quarkus vs Spring Boot
• More Java Frameworks or Libraries
• Java Testing Frameworks

Java

• reddit.com/r/java
• medium.com/@javachampions : Java is still free
• Oracle Java 11 and OpenJDK
• developers.redhat.com: The future of Java and OpenJDK updates without Oracle support
• redhat.com: The history and future of OpenJDK
• javarevisited.blogspot.com: The 2020 Java Developer RoadMap 🌟
• marcobehler.com: Java Versions and Features 🌟
• advancedweb.hu: A categorized list of all Java and JVM features since JDK 8 to 14
• JDK 15: The new features in Java 15 Just-arrived update to standard Java features text blocks, hidden classes, the Z Garbage Collector, and previews of pattern matching and records.
• GitHub Welcomes the OpenJDK Project!
• advancedweb.hu: A categorized list of all Java and JVM features since JDK 8 to 16
• javaconceptoftheday.com: Java 9 Interface Private Methods
• javatechonline.com: Making Java easy to learn - Microservices In Java 🌟 The top five languages that are using Microservices are Java, Python, C++, Ruby and Golang. Although this data is based on the number of companies using it. Again Microservices in Java is leading the table.
• java-success.com: 01: Q07 – Q12 Java Micro & Web services Interview Q&As
• javatechonline.com: Making Java easy to learn - OOPs Design Principles
• javatechonline.com: Making Java easy to learn - Spring Boot Annotations With Examples

How to migrate Java workloads to containers

• enterprisersproject.com: How to migrate Java workloads to containers: 3 considerations As IT teams weigh what to containerize and migrate to a cloud environment, they need to evaluate many Java workloads. Experts explain three key factors

Existing Java Implementations

• Oracle Java
• Oracle OpenJDK
• IBM JDK (based on Eclipse OpenJ9)
• Red Hat OpenJDK
• AdoptOpenJDk (based on Eclipse OpenJ9)

Use Java 11

• It’s time! Migrating to Java 11 🌟
• Oracle's Java 11 trap - Use OpenJDK instead! 🌟
• AdoptOpenJDK 11 Is the New Default 🌟
• All You Need To Know For Migrating To Java 11

Java Collections Interview Questions

• 50+ Java Collections Interview Questions for Beginners and Experienced Programmers

Java Programming Models (Frameworks)

• Best Java Frameworks Solutions The best Java Frameworks vendors are Apache Spark, Spring Boot, Oracle Application Development Framework (Oracle ADF), Jakarta EE, and Open Liberty. Apache is the top solution according to IT Central Station reviews and rankings. One reviewer writes: "Fast performance and has an easy initial setup", and another reviewer writes: "Easy to use and is capable of processing large amounts of data". The 2nd best product is Spring Boot. A user writes: "Very smooth implementation; excellent features for monitoring and tracking network calls ", and another reviewer writes: "Makes it difficult to support a specific functionality in a user-friendly manner, but simplifies application deployment".
• Open Source Microservices Frameworks (frameworks for microservices development):
  • Spring
  • MicroProfile

Java Programming Model	Technology	Cloud Native (microservices)	Platform
Java EE Java EE at a Glance	Frontend + Backend Java EE Monoliths	No	Java EE Middleware Servers (WAS, WebLogic, JBoss EAP, etc)
Jakarta EE (Java EE renamed)	Frontend + Backend	Yes	OpenShift, Kubernetes, etc
MicroProfile	Backend (RESTful)	Yes	OpenShift, Kubernetes, etc
SpringBoot (Spring)	Backend (RESTful)	Yes	OpenShift, Kubernetes, etc
Spring Cloud (Spring)	Backend (RESTful)	Yes	OpenShift, Kubernetes, etc
Quarkus	Backend (RESTful)	Yes	OpenShift, Kubernetes, etc
Thorntail	Backend (RESTful)	Yes	OpenShift, Kubernetes, etc
etc

Jakarta EE

• developers.redhat.com: Jakarta EE 8: The new era of Java EE explained
• developers.redhat.com: Making Java programs cloud-ready, Part 1: An incremental approach using Jakarta EE and MicroProfile
• developers.redhat.com: Making Java programs cloud-ready, Part 2: Upgrade the legacy Java application to Jakarta EE

Eclipse MicroProfile

• Eclipse MicroProfile Project The Eclipse MicroProfile project is aimed at optimizing Enterprise Java for the microservices architecture.
  • Many innovative "microservice" Enterprise Java environments and frameworks already exist in the Java ecosystem. These projects are creating new features and capabilities to address microservice architectures -- leveraging both Java EE and non-Java EE technologies.
  • The goal of the Eclipse MicroProfile project is to iterate and innovate in short cycles to propose new common APIs and functionality, get community approval, release, and repeat. Eventually, the outputs of this project could be submitted to the Eclipse Jakarta EE, JCP, OpenJDK or any relevant standards body.
• MicroProfile.io Optimizing Enterprise Java for a Microservices Architecture
• developers.redhat.com: Eclipse MicroProfile for Spring Boot developers
• Eclipse MicroProfile: 5 Things You Need to Know 🌟
• developers.redhat.com: Develop Eclipse MicroProfile applications on Red Hat JBoss Enterprise Application Platform Expansion Pack 1.0 with Red Hat CodeReady Workspaces
• infoq.com: Virtual Panel: The MicroProfile Influence on Microservices Frameworks

Server Vendors providing MicroProfile runtimes

• WebSphere Liberty from IBM
• TomEE from Tomitribe
• Payara
• RedHat’s WildFly Swarm
• KumuluzEE

Spring

• Spring
• Spring Framework Architecture 🌟
• javatutorial.net: Introduction to Spring Web Framework
• javarevisited.blogspot.com: 10 JdbcTemplate Examples in Spring Framework
• medium.com: Top 10 Courses to Learn Microservices in Java and Spring Framework
• dzone: How to Create Microservices Using Spring 🌟 Let’s consider the use case of BookMyHotel Web Application, developed by a company known as MyInternetSolutions.
• spring.io: A Java 17 and Jakarta EE 9 baseline for Spring Framework 6

SpringBoot

• SpringBoot
• dzone: All About Spring Boot (Tutorials and Articles)
• jaxenter.com: CI/CD for Spring Boot Microservices: Part 1
• jaxenter.com: CI/CD for Spring Boot Microservices: Part 2. Extending CI/CD: Kubernetes Continuous Deployment for Microservices
• dzone: Deploying Spring Boot App to JBoss Wildfly
• Spring Boot: ¿war o jar? Ambos
• javatutorial.net: Spring vs. Java EE
• medium.com: Spring Cloud kubernetes for hybrid microservices architecture
• 10 Free Spring Boot Courses and Tutorials for Java Developers
• Spring Boot Istio library: Spring Boot library for integration with Istio

• Spring Boot native images. The path towards Spring Boot native applications
• piotrminkowski.com: Best practices for microservices on kubernetes 🌟
• piotrminkowski.com: Spring Boot Autoscaling on kubernetes 🌟
• spring.io: What's new in Spring Boot 2.4 🌟
  • Changes to Application properties/yaml
• arnoldgalovics.com: Java and Spring Boot multiline log support for Fluentd (EFK stack)
• developers.redhat.com: Spring Boot on Quarkus: Magic or madness?
• codecentric's Spring Boot Admin UI 🌟 Admin UI for administration of spring boot applications
• piotrminkowski.com: Spring Boot Tips, Tricks and Techniques
• javatechonline.com: How To Work With Apache Kafka In Spring Boot?

SpringBoot with Docker

• spring.io: spring boot with docker
• spring.io: Creating Docker images with Spring Boot 2.3.0.M1
• learnk8s.io: Developing and deploying Spring Boot microservices on Kubernetes
• youtube: Creating Docker Images With Spring Boot
• dev.to: The Simple Guide To Dockerizing Spring Boot

SpringBoot Tools

High-level abstractions/tools to run SpringBoot application on kubernetes without having to write 10,000 lines YAML. Tools that can automate the generation of Kubernetes manifests, so you concentrate only on building your business logic. Dekorate even supports annotations spring-like @KubernetesApplication(name="my-app") in your code, that generates your deployment manifest yml:

• odo CLI tool
• Dekorate Java library, has a Spring Boot support
• JKube Maven plugin
• Skaffold --generate-manifests
• Spring Cloud Kubernetes
• testcontainers-spring-boot 🌟 Container auto-configurations for spring-boot based integration tests. If you use Testcontainers with Spring Boot Hoja balanceándose en el viento you may be interested in the Playtika_Ltd Testcontainers library that provides auto-configurations for springboot based integration tests. It contains modules e.g. for kafka rabbitmq mongodb

Demos

• Salaboy/From Monolith to K8s Workshop-style guide for rearchitecting a Java Monolith application to a Cloud Native architecture running in Kubernetes
• dyser/kubernetes-intro

Spring Cloud

• Spring Cloud

Spring Cloud Kubernetes

• github: Spring Cloud Kubernetes 🌟
• Spring Cloud Kubernetes for hybrid microservices architecture
• piotrminkowski.com: Microservices with spring cloud kubernetes

Spring Cloud Config and Spring Cloud Config Server

• Spring Cloud Config
• Spring Cloud Config Server: Git Backend
• developer.okta.com: Spring Cloud Config for Shared Microservice Configuration
• redhat.com: Spring Boot Microservices on Red Hat OpenShift Container Platform 3 - Software Stack - Externalized Configuration Spring Cloud Config provides server and client-side support for externalized configuration in a distributed system. With the Config Server you have a central place to manage external properties for applications across all environments.
• dzone: Spring Cloud Config Server on Kubernetes (Part 1)
• dzone: Spring Cloud Config Server on Kubernetes (Part 2) Time to bring your services to Kubernetes.
• piotrminkowski.com: Spring Microservices Security Best Practices 🌟

Secure Secrets with Spring Cloud Vault and alternatives

• cloud.spring.io: Spring Cloud Vault 🌟
• developer.okta.com: Secure Secrets With Spring Cloud Config and Vault 🌟 Nowadays it is widely recommended to never store secret values in code. Therefore, this tutorial will demonstrate the following alternatives:
  • Using environment variables for Spring Boot secrets
  • Secrets encryption with Spring Cloud Config
  • Secrets management with HashiCorp’s Vault
  • Using Spring Cloud Vault

[](https://medium.com/javarevisited/10-free-spring-boot-tutorials-and-courses-for-java-developers-53dfe084587e)

Quarkus

• quarkus.io Quarkus is a Kubernetes-native Java stack that is crafted from best-of-breed Java libraries and standards, and tailored for containers and cloud deployments
• Quarkus Images This repository contains the container images used by Quarkus.
• quarkus.io: Quarkus for Spring Developers
• redhat.com: Red Hat drives future of Java with cloud-native, container-first Quarkus
• developers.redhat.com: Quarkus: A quick-start guide to the Kubernetes-native Java stack
• quarkus.io: Quarkus support in IDE's
• dzone: quarkus refcard
• dzone: Build a Java REST API With Quarkus
• developers.redhat.com: Autowire MicroProfile into Spring with Quarkus
• dmcommunity.org: Who will win? Spring Boot or Quarkus
• developers.redhat.com: How Quarkus brings imperative and reactive programming together
• developers.redhat.com: Migrating a Spring Boot microservices application to Quarkus
• Quarkus, a Kubernetes-native Java runtime, now fully supported by Red Hat
• The road to Quarkus GA: Completing the first supported Kubernetes-native Java stack
• containerjournal.com: Red Hat Adds Java Runtime for Kubernetes to Subscription Quarkus provides access to a library of more than 200 extensions, including tools such as RESTEasy, Hibernate and Eclipse MicroProfile, along with specific extensions fo Red Hat cloud services such as Red Hat AMQ Streams, Red Hat AMQ Broker and Red Hat Fuse.
• developers.redhat.com: Quarkus and Jakarta EE: Together, or not?
• youtube: CyberJUG-HH:Why is everybody talking about Quarkus? In this (Why is everybody talking about Quarkus?) Java User Group Hamburg (CyberJUG-HH) session I highlighted possible reasons for Quarkus' popularity, explained Quarkus' optimisation tricks, the differences between Jakarta EE / J2EE / Java EE application servers and Quarkus, discussed the role of MicroProfile and Jakarta EE, migrated a Java EE application to Quarkus, performed multiple deployments, decompiled some code, measured memory consumption and finally cross compiled the Java service to native code using GraalVM.
• developers.redhat.com: Build an API using Quarkus from the ground up 🌟
• developers.redhat.com: RESTEasy Reactive and more in Quarkus 2.0
• opensource.com: 3 reasons Quarkus 2.0 improves developer productivity on Linux 🌟 New features in Quarkus 2.0 make it easier to test code in the developer console.
• redhat.com: Four reasons to try Quarkus (pdf checklist) Quarkus is an open source, Kubernetes-native Java™ framework tailored for GraalVM and OpenJDK HotSpot. It offers a full-stack framework, using top Java libraries and standards. With Quarkus, Java can be a leading platform in Kubernetes and serverless environments, while offering developers a unified reactive and imperative programming model to address a wider range of distributed application architectures. Download this checklist to learn 4 reasons why developers should use Quarkus as a programming tool.
• developers.redhat.com: Deploy Quarkus everywhere with Red Hat Enterprise Linux (RHEL)
• infoq.com: Quarkus 2.0 Delivers Continuous Testing, CLI and Supports Minimal JDK 11
• Quarkus - Dev UI 🌟
• dzone: A Java developer's guide to Quarkus A new eBook demonstrates how developers can keep using the Java framework to build new serverless functions.
• developers.redhat.com: Why should I choose Quarkus over Spring for my microservices?
• Quarkus Tip: if you DON'T set a database URL, user, and password, QuarkusIO automatically starts your database using testcontainers if a Docker daemon is running. It is enabled in dev, test mode and applies to e.g. postgresql, mysql and mongodb.

Imagine needing to spend less😉
Guess what minimum heap size you need to run a @QuarkusIO 2.0 *on JVM* to run a simple CRUD endpoint? (no toy: including @Hibernate , @resteasy, Jackson, JTA transactions, DB connection pool, caching, @vertx_project ,Netty, CDI via ArC, ...)

— Sanne (@SanneGrinovero) July 2, 2021

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Kogito cloud-native business automation framework

• redhat.com: Cloud-native business automation with Kogito
• kie.org Kogito is the next generation of business automation platforms focused on cloud-native development, deployment, and execution. Kogito is composed of the battle-tested projects of the KIE group: Drools, jBPM, and OptaPlanner.
  • kogito.kie.org
• dzone: Getting Started With Red Hat Business Automation Version 7.11 (i.e. Retail online web shop) This last week the new release of the Red Hat Business Automation products went live, spanning Red Hat Process Automation Manager and Red Hat Decision Manage...

Thorntail (aka WildFly Swarm)

• Red Hat Thorntail is a framework based on the popular WildFly Java application server to enable the creation of small, stand-alone microservice-based applications. Thorntail is capable of producing so-called just enough app-server to support each component of your system.

Spring Boot VS MicroProfile

• Dzone: Programming Styles Compared: Spring Framework vis-a-vis Eclipse MicroProfile 🌟🌟
• ibm.com: Java Microservices with MicroProfile – RESTful APIs and Dependency Injection. For microservices-based Java apps, knowing how to create REST APIs is an essential skill. Eclipse MicroProfile makes it easier Spring Boot or MicroProfile for Java microservices apps? Choose the path of least resistance. The Spring Boot and MicroProfile frameworks have many of the same goals (i.e., you can do everything in MicroProfile that you can do in Spring Boot). Both of them are built on top of the same core APIs; even though there are differences in some of the APIs, the work they do is similar.

Quarkus vs Spring Boot

• dzone: Microservices: Quarkus vs. Spring Boot In the era of containers (the ''Docker Age'') Java is still on top, but which is better? Spring Boot or Quarkus?

More Java Frameworks or Libraries

• JPA streamer 🌟 JPAstreamer is a library for expressing JPA/Hibernate queries as Java streams. It can be also integrated with Spring.
• logbook An extensible Java library for HTTP request and response logging

Java Testing Frameworks

• dzone: The Best Java Testing Frameworks to focus in 2021 Java Testing Frameworks provide standardized, extendable ways for programmers and developers to build any software application or web apps.
• jfrunit A JUnit extension for asserting JDK Flight Recorder events
  • morling.dev: Introducing JfrUnit 1.0.0.Alpha1

I'm observing @QuarkusIO for a long time. I think it's time to consider migration from Spring Boot into Quarkus especially if you develop on the Kubernetes-native platform. You may expect some tips in the near future - smth similar to #SpringBootTip series some months ago.

— Piotr Mińkowski (@piotr_minkowski) September 2, 2021

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