Java Distributions

About

Java distributions are packaged versions of the Java Development Kit (JDK) and/or Java Runtime Environment (JRE) provided by various vendors. These distributions include everything needed to develop, compile, and run Java applications.

Key Components of Java Distributions

Java Development Kit (JDK):

• Compiler (javac): Converts Java source code into bytecode.

• Java Virtual Machine (JVM): Executes Java bytecode on any device or operating system.

• Core Libraries: Essential Java libraries required for development.

• Utilities: Tools for documentation (javadoc), debugging (jdb), and other development tasks.

Java Runtime Environment (JRE):

• JVM: Runs Java applications.

• Core Libraries: Libraries necessary to run Java applications.

• Runtime Libraries: Additional libraries and components required for execution.

Popular Java Distributions:

Oracle JDK:

• Developed and maintained by Oracle.

• Includes commercial features and long-term support (LTS) options for enterprises.

• Free for development and testing; requires a subscription for production use.

OpenJDK:

• An open-source implementation of the JDK.

• Maintained by the Java community and led by Oracle.

• Often the basis for other distributions.

Amazon Corretto:

• A free, multiplatform, production-ready distribution of OpenJDK.

• Maintained by Amazon with long-term support.

AdoptOpenJDK (now Eclipse Adoptium):

• Provides prebuilt OpenJDK binaries.

• Community-driven and now under the Eclipse Foundation as Eclipse Adoptium.

Zulu by Azul Systems:

• Provides free, certified builds of OpenJDK.

• Offers enterprise support and additional commercial features.

Liberica JDK by BellSoft:

• Provides full and lightweight distributions of OpenJDK.

• Includes support for various platforms and long-term support options.

IBM Semeru Runtime:

• IBM's distribution of OpenJDK.

• Tailored for IBM's hardware and cloud environments, with enterprise support options.

Why Different Distributions?

• Support and Maintenance: Different vendors offer varying levels of support, bug fixes, and security updates.

• Licensing: Some distributions are completely free, while others require a subscription for commercial use.

• Performance and Features: Vendors may include optimizations and additional features suited for specific environments or use cases.

• Compliance and Certification: Ensures compatibility and reliability for enterprise applications.

Choosing a Distribution:

When selecting a Java distribution, consider the following factors:

• Support Needs: Do you need commercial support and long-term updates?

• Performance Requirements: Are there performance optimizations specific to your environment?

• Licensing Terms: Do you need a distribution with a free or commercial license?

• Compatibility: Ensure the distribution is compatible with your development and production environments.