![]() Please do not seek technical support through the Bug Database or our development teams. You can send feedback to the Java SE documentation team. To directly submit a bug or request a feature, fill out this form: The JDK Bug Database web site lets you search for and examine existing bug reports, submit your own bug reports, and tell us which bug fixes matter most to you. Some compatibility-breaking changes were required to close potential security holes or to fix implementation or design bugs. Most failures to do so are considered bugs, except for a small number of cases where compatibility was deliberately broken, as described on our compatibility web page. ![]() Although some incompatible changes were necessary, most software should migrate to the current version with no changes. Every effort has been made to support programs written for previous versions of the Java platform. See the JDK 15 Migration Guide for a list of known compatibility issues. Please check the on-line release notes for the latest information as they will be updated as needed. See the Release Notes for additional information pertaining to this release. This documentation provides brief descriptions of the API with an emphasis on specifications, not on code examples Release Notes For API documentation, refer to the The Java Platform, Standard Edition API Specification. To obtain the documentation bundle visit the Java SE download page. The Java SE documentation is also available in a download bundle which you can install on your machine. The on-line Java Platform, Standard Edition (Java SE) Documentation contains API specifications, feature descriptions, developer guides, reference pages for JDK tools and utilities, and links to related information. Installation instructions are located on the Java SE documentation site. The JDK includes tools useful for developing, testing, and monitoring programs written in the Java programming language and running on the Java platform. The JDK is a development environment for building applications and components using the Java programming language. ![]() Thank you for downloading this release of the Java Platform, Standard Edition Development Kit (JDK). Unlimited Strength Java Cryptography Extension.This section will instruct you on how to set the JAVA_HOME and PATH environment variables to help ensure that your Java applications will run without issue. If you have chosen to install the full OpenJDK development kit, check the version of the compiler as well: javac -versionĪs of the time of this publication, this command should return: javac 11.0.7 OpenJDK 64-Bit Server VM (build 11.0.7+10-post-Ubuntu-3ubuntu1, mixed mode, sharing) OpenJDK Runtime Environment (build 11.0.7+10-post-Ubuntu-3ubuntu1) This is generally slower than running applications that have already been compiled into Java bytecode, and may not be suitable for frequent application execution.Ĭheck the version of the JRE to verify that it has been properly installed: java -versionĪs of the time of this publication, this command should return: openjdk version "11.0.7" While you can run Java applications directly with the JRE, your applications will be compiled every time they are executed. Install the OpenJDK 11 development kit, which includes OpenJRE 11: sudo apt-get install openjdk-11-jdkĪlternatively, if you simply want to run Java applications that you have already downloaded, you can choose to only install OpenJRE 11: sudo apt-get install openjdk-11-jre This guide will use sudo commands wherever possible, which should be run by a limited, non-root user on your Linode.Įnsure your system is up-to-date: sudo apt-get update & sudo apt-get upgrade Before You Beginįamiliarize yourself with our Getting Started guide and complete the steps for connecting to your Linode with SSH and setting your Linode’s hostname and timezone.Ĭomplete the sections of our guide on Securing Your Server to create a standard user account, harden SSH access and remove unnecessary network services. For this reason, OpenJDK 11 is the recommended version for developing production applications. While there are many available versions of OpenJDK, version 11 is the latest Long-Term-Support (LTS) release as of the time of this guide’s publication. OpenJDK and Java SE are equivalent JDKs that include a Java runtime environment (JRE) and tools for developing and compiling Java applications. OpenJDK is the free and open-source implementation of the Oracle Java Standard Edition (Java SE) Development Kit. This guide will show you how to install the Open Java Development Kit (OpenJDK) 11 on Ubuntu 20.04. Software written in Java can be compiled and run on any system, making Java a versatile platform that can be used to create anything from software to basic web applications. Java is one of the world’s most popular programming languages.
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