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.
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