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Introduction


If you are a Java developer or a user of Java applications, you probably know that you need a Java Development Kit (JDK) to compile, run, and debug your code. A JDK consists of a Java Runtime Environment (JRE), which contains the Java Virtual Machine (JVM) and the core libraries, and a set of development tools, such as a compiler, a debugger, a documentation generator, and more.


But which JDK should you use? There are many implementations of the Java Platform, Standard Edition (Java SE) specification, which defines the features and functionality of the Java language and platform. One of them is OpenJDK, a free and open source implementation that is also the official reference implementation since Java SE 7.


In this article, you will learn more about what OpenJDK is, what are its benefits and differences compared to Oracle JDK, the commercial product from Oracle, and how to download and install it on your operating system. You will also find some common issues and solutions for OpenJDK users.

 
What is OpenJDK?


OpenJDK stands for Open Java Development Kit. It is a project that was started in 2006 by Sun Microsystems, the original creator of Java, to release the source code of the JDK under an open source license. The project is now sponsored by Oracle Corporation, which acquired Sun in 2010, and supported by other companies and organizations, such as IBM, Red Hat, Apple, SAP, Microsoft, Amazon, and others.


OpenJDK aims to provide an open and inclusive way to define the future of the Java platform. It follows a collaborative development model where anyone can contribute code, bug fixes, tests, documentation, or ideas. It also hosts several sub-projects that focus on specific aspects or features of Java SE, such as HotSpot (the JVM), Graal (the compiler), Nashorn (the JavaScript engine), JShell (the interactive shell), or JMC (the monitoring console).


OpenJDK is compatible with the Java SE specification and passes the Java Technology Certification Kit (TCK), which is a suite of tests that verifies the compliance of an implementation with the standard. It also provides regular updates and security patches for its supported versions.

 
Benefits of using OpenJDK


There are several reasons why you might want to choose OpenJDK over other JDKs. Some of them are:





Open source innovation
: By using OpenJDK, you can benefit from the collective efforts and expertise of a large and diverse community of developers who work together to improve the quality and performance of the Java platform. You can also participate in the development process by contributing your own code or feedback.



Cost savings
: Unlike Oracle JDK, which requires a commercial license for production use since Java SE 11, OpenJDK is completely free to use for any purpose. You don't have to pay any fees or royalties to Oracle or any other vendor for using OpenJDK.



Multiplatform support
: OpenJDK is available for various operating systems, such as Windows, Linux, macOS, Solaris, and others. You can also find different distributions of OpenJDK that are tailored for specific platforms or needs, such as AdoptOpenJDK, Amazon Corretto, Azul Zulu, Red Hat OpenJDK, or Oracle OpenJDK.



Long-term support
: OpenJDK provides long-term support (LTS) versions that receive security and stability updates for several years. The current LTS version is Java SE 11, which will be supported until 2026. The next LTS version will be Java SE 17, which will be released in September 2021 and supported until 2029.



 
Differences between OpenJDK and Oracle JDK


Although OpenJDK and Oracle JDK are both based on the same source code and comply with the Java SE specification, there are some differences between them t

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Introduction


Java is one of the most popular and widely used programming languages in the world. It allows developers to create applications that can run on different platforms and devices, from desktops and servers to mobile phones and embedded systems. However, to run Java applications, you need a Java Development Kit (JDK) and a Java Runtime Environment (JRE).


A JDK is a software development environment that contains the tools and libraries needed to compile, debug, and run Java applications. A JRE is a software package that contains the components needed to execute Java applications, such as the Java Virtual Machine (JVM) and the core class libraries. A JDK includes a JRE, but a JRE does not include a JDK.


There are many implementations of the JDK and JRE available in the market, but the most widely used ones are Oracle JDK and OpenJDK. Oracle JDK is the official implementation of the Java SE platform by Oracle Corporation, which acquired Sun Microsystems, the original creator of Java, in 2010. OpenJDK is an open source implementation of the Java SE platform that is sponsored and led by Oracle, but also involves other contributors from the Java community.


Red Hat build of OpenJDK is a free and open source distribution of OpenJDK that is supported by Red Hat, one of the leading providers of enterprise open source solutions. Red Hat build of OpenJDK is available for Red Hat Enterprise Linux (RHEL), Windows, and other Linux environments as a JRE and a complete JDK. It is also shipped as a JDK and JRE in many containers in the Red Hat Container Catalog.


In this article, we will explain how to download and install Red Hat build of OpenJDK, what are the benefits and differences of using it compared to Oracle JDK, and what are some common issues that you might encounter. By the end of this article, you will have a better understanding of OpenJDK Red Hat and how to use it for your Java development needs.

 
Downloading OpenJDK Red Hat


To download OpenJDK Red Hat, you need to visit the 
Red Hat Developer website
 and register for a free account. Once you have logged in, you can access the 
download page
 for OpenJDK Red Hat.


On the download page, you can choose from three versions of OpenJDK Red Hat: 8u, 11u, and 17u. These versions correspond to the major releases of Java SE: 8, 11, and 17. Each version has different features and support policies, so you should choose the one that suits your requirements best.


For each version, you can download either a ZIP or an MSI file for Windows, or a TAR.XZ file for Linux. You can also download a ZIP file containing the source code for each version. Additionally, you can download container images for OpenJDK Red Hat from the 
Red Hat Ecosystem Catalog
.


The following table shows the latest release dates and file sizes for each version of OpenJDK Red Hat:


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Introduction


Java is one of the most popular and widely used programming languages in the world. It allows developers to create applications that can run on different platforms and devices, from desktops and servers to mobile phones and embedded systems. However, to run Java applications, you need a Java Development Kit (JDK) and a Java Runtime Environment (JRE).


A JDK is a software development environment that contains the tools and libraries needed to compile, debug, and run Java applications. A JRE is a software package that contains the components needed to execute Java applications, such as the Java Virtual Machine (JVM) and the core class libraries. A JDK includes a JRE, but a JRE does not include a JDK.


There are many implementations of the JDK and JRE available in the market, but the most widely used ones are Oracle JDK and OpenJDK. Oracle JDK is the official implementation of the Java SE platform by Oracle Corporation, which acquired Sun Microsystems, the original creator of Java, in 2010. OpenJDK is an open source implementation of the Java SE platform that is sponsored and led by Oracle, but also involves other contributors from the Java community.


Red Hat build of OpenJDK is a free and open source distribution of OpenJDK that is supported by Red Hat, one of the leading providers of enterprise open source solutions. Red Hat build of OpenJDK is available for Red Hat Enterprise Linux (RHEL), Windows, and other Linux environments as a JRE and a complete JDK. It is also shipped as a JDK and JRE in many containers in the Red Hat Container Catalog.


In this article, we will explain how to download and install Red Hat build of OpenJDK, what are the benefits and differences of using it compared to Oracle JDK, and what are some common issues that you might encounter. By the end of this article, you will have a better understanding of OpenJDK Red Hat and how to use it for your Java development needs.

 
Downloading OpenJDK Red Hat


To download OpenJDK Red Hat, you need to visit the 
Red Hat Developer website
 and register for a free account. Once you have logged in, you can access the 
download page
 for OpenJDK Red Hat.


On the download page, you can choose from three versions of OpenJDK Red Hat: 8u, 11u, and 17u. These versions correspond to the major releases of Java SE: 8, 11, and 17. Each version has different features and support policies, so you should choose the one that suits your requirements best.


For each version, you can download either a ZIP or an MSI file for Windows, or a TAR.XZ file for Linux. You can also download a ZIP file containing the source code for each version. Additionally, you can download container images for OpenJDK Red Hat from the 
Red Hat Ecosystem Catalog
.


The following table shows the latest release dates and file sizes for each version of OpenJDK Red Hat:


How to download openjdk red hat build of java

Download openjdk red hat developer studio

Download openjdk red hat enterprise linux installation

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How to Download and Install OpenJDK on Red Hat Linux and Windows Systems

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How to Download OpenJDK 12 for Your Operating System


OpenJDK is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). It is the official reference implementation of Java SE since version 7. OpenJDK is widely used by developers and enterprises around the world for developing and running Java applications.


OpenJDK 12 is the latest release of OpenJDK as of March 2019. It contains many new features and enhancements, such as switch expressions, raw string literals, dynamic class-file constants, default CDS archives, low-pause-time garbage collector, microbenchmark suite, and more. You can find the full list of changes in the 
release notes
.


In this article, we will show you how to download and install OpenJDK 12 for different operating systems, such as Windows, Linux, and MacOS. We will also show you how to verify the installation and check the version of OpenJDK 12 on your system.

 
How to Download OpenJDK 12 for Windows


There are two ways to download OpenJDK 12 for Windows: using ZIP or MSI packages, or using Windows Package Manager.

 
Using ZIP or MSI Packages


You can download ZIP or MSI packages from 
OpenJDK website
. The ZIP package contains a compressed folder with all the files needed to run OpenJDK 12. The MSI package is an installer that will automatically set up OpenJDK 12 on your system.


To use the ZIP package, follow these steps:




Download the .zip file from 
OpenJDK website
.


Extract the .zip file to a folder of your choice.


Set the JAVA_HOME environment variable to point to that folder.


Add the bin subfolder of that folder to your PATH environment variable.




To use the MSI package, follow these steps:




Download the .msi file from 
OpenJDK website
.


Double-click on the .msi file and follow the instructions on the screen.


The installer will automatically set up OpenJDK 12 on your system and update your PATH and JAVA_HOME environment variables.



 
Using Windows Package Manager


If you have Windows Package Manager installed on your system, you can use it to download and install OpenJDK 12 from your Windows Terminal. Windows Package Manager is a command-line tool that allows you to manage software packages on Windows.


To use Windows Package Manager, follow these steps:




Open Windows Terminal.


Type winget install openjdk --version=12.0.2 and press Enter.


The tool will automatically download and install OpenJDK 12 on your system.



 
How to Download OpenJDK 12 for Linux


There are two ways to download OpenJDK 12 for Linux: using TAR.GZ packages, or using DEB or RPM packages.


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OpenJDK 6: A Free and Open-Source Implementation of Java SE 6
 | | Introduction: What is OpenJDK 6 and why is it important? | 
If you are looking for a free and open-source alternative to Oracle JDK 6, you might want to consider OpenJDK 6. OpenJDK 6 is an implementation of the Java SE 6 specification that values stability, compatibility, and security. It is the result of an effort that Sun Microsystems started in 2006 and continued by Oracle after acquiring Sun in 2010. It is also the official reference implementation of Java SE since version 7.
 | | H2: Features of OpenJDK 6 | 
Features of OpenJDK 6
 | | H3: Compatibility with Java SE 6 specification | 
Compatibility with Java SE 6 specification
 | | How OpenJDK 6 follows the Java SE 6 specification and passes the Java Technology Compatibility Kit (TCK) tests | 
One of the main features of OpenJDK 6 is that it follows the Java SE 6 specification as closely as possible. This means that it supports all the features and APIs that are defined in the specification, such as generics, annotations, enums, varargs, autoboxing, concurrency utilities, scripting support, Swing look-and-feel improvements, JDBC 4.0, XML processing enhancements, web services support, and more. It also passes the Java Technology Compatibility Kit (TCK) tests, which are a set of tests that verify the compliance of a Java implementation with the specification.
 | | H3: Stability and security updates | 
Stability and security updates
 | | How OpenJDK 6 provides bug fixes and security patches for older versions of Java | 
Another feature of OpenJDK 6 is that it provides bug fixes and security patches for older versions of Java that are no longer supported by Oracle. For example, Oracle stopped providing public updates for Oracle JDK 6 in April 2013, but OpenJDK 6 continued to receive updates until February 2023. This means that if you are using an application that requires Java SE 6 or earlier, you can still benefit from the stability and security improvements that OpenJDK 6 offers.
 | | H3: Open-source development and community involvement | 
Open-source development and community involvement
 | | How OpenJDK 6 is developed under an open-source license and welcomes contributions from developers | 
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OpenJDK 6: How to get the open-source Java SE 6 implementation

In this episode, Michael Redlich, lead editor of the Java topic at InfoQ, sat down with podcast co-host Daniel Bryant and discussed the recent publication of the InfoQ Java Trends Report. Topics covered included the release of Java 21, the adoption of Java virtual threads, the evolution of the Jakarta EE and Spring projects, and the development of community and ecosystems projects.

Read a transcript of this interview: https://bit.ly/3Reieyy

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InfoQ Podcast

Transcript

InfoQ Java Trends Report 2023 - Discussing Insights with Mike Redlich

Работа программиста немыслима без взаимодействия с памятью. Мы с легкостью создаем переменные и манипулируем ссылками на различные объекты в куче. И далеко не всегда задумываемся о том, какие задачи приходится решать разработчикам языков и рантаймов, чтобы выделение и освобождение памяти происходило быстро и эффективно. Чтобы разобраться в теме, мы позвали в гости Алексея Шипилёва из Red Hat, который уже более 10 лет занимается вопросами производительности Java. В настоящее время Алексей разрабатывает реализацию сборщика мусора в OpenJDK, и с темой менеджмента памяти он знаком не понаслышке. 
Выпуск получился достаточно хардкорным и крайне насыщенным. А еще мы разрушили миф о том, что ARC не имеет никакого отношения к GC.

Поддержи лучший подкаст про мобильную разработку:
www.patreon.com/podlodka

Также ждем вас, ваши лайки, репосты и комменты в мессенджерах и соцсетях! 
Telegram-чат: https://t.me/podlodka  
Telegram-канал: https://t.me/podlodkanews
Страница в Facebook: www.facebook.com/podlodkacast/
Twitter-аккаунт: https://twitter.com/PodlodkaPodcast  

Содержание:
- 00:00:38 - Знакомство с гостем
- 00:02:19 - Что такое память в программировании
- 00:06:28 - Про computer science
- 00:07:17 - Управление сложностью процессов
- 00:09:54 - Высокоуровневые языки программирования
- 00:13:44 - Про ассемблер и пузырьковую сортировку
- 00:16:49 - Ручной менеджмент памяти
- 00:25:36 - Слабая гипотеза о поколениях
- 00:29:26 - Автоматический менеджмент памяти
- 00:32:09 - Reference counting
- 00:39:37 - Reference counting и циклические ссылки
- 00:48:00 - Трассирующие сборщики мусора
- 01:00:46 - Concurrent-коллекторы
- 01:06:26 - Как создатели языков выбирают менеджер памяти?
- 01:11:17 - Как выбрать GC
- 01:17:45 - Как правильно программировать, зная свой GC
- 01:22:32 - LRU-кэш и GC
- 01:27:59 - Про производительность и бизнес-логику
- 01:33:05 - Будни разработчика GC
- 01:41:35 - Как стать разработчиком GC
- 01:47:44 - Подведение черты
- 01:48:41 - Вопрос почти Стасу

Полезные ссылки:
- Talks: 
  https://shipilev.net/#shenandoah 
- The Garbage Collection Handbook: 
  http://gchandbook.org/
- Shenandoah GC: 
  https://wiki.openjdk.java.net/display/shenandoah/Main 
- ZGC: 
  http://openjdk.java.net/jeps/333 
- Epsilon GC: 
  http://openjdk.java.net/jeps/318 
- “JVM Anatomy Park: TLAB Allocation”: 
  https://shipilev.net/jvm-anatomy-park/4-tlab-allocation/ 
- “JVM Anatomy Park: GC Design And Pauses” 
  https://shipilev.net/jvm-anatomy-park/3-gc-design-and-pauses/ 
- “JVM Anatomy Park: Moving GC And Locality”
  https://shipilev.net/jvm-anatomy-park/11-moving-gc-locality/ 
- “Логика неизбежности”: 
  https://lex-kravetski.livejournal.com/301063.html
- “Dismissing Python Garbage Collection” 
  https://instagram-engineering.com/dismissing-python-garbage-collection-at-instagram-4dca40b29172 
- Swift: “App crash with memory corruption on property set”
  https://bugs.swift.org/browse/SR-8101
  https://twitter.com/virlof/status/1011303236395941890

Podlodka #74 – Управление памятью

Software engineers, architects and team leads have found inspiration to drive change and innovation in their team by listening to the weekly InfoQ Podcast. They have received essential information that helped them validate their software development map. We have achieved that by interviewing some of the top CTOs, engineers and technology directors from companies like Uber, Netflix and more. Over 1,200,000 downloads in the last 3 years.

Podlodka – это еженедельное аудио-шоу про IT и все, что с ним связано. Формат наших выпусков - это полное погружение в тему вместе с приглашенным гостем. В каждый выпуск мы зовём интересных и именитых профессионалов в разных областях.

Мы любим обсуждать архитектуру, делиться опытом промышленной разработки и спорить на горячие темы.

Подкаст Подлодка ведут четверо весёлых и опытных инженеров с примесями менеджеров:
- Егор Толстой (Kotlin Project Lead, JetBrains)
- Стас Цыганов (Product Manager, Kotlin team в JetBrains)
- Катя Петрова (Product Marketing Manager, Kotlin team в JetBrains)
- Женя Кателла (Staff Developer, Shopify)

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