![]() Join us if you’re a developer, software engineer, web designer, front-end designer, UX designer, computer scientist, architect, tester, product manager, project manager or team lead. The problem solvers who create careers with code. The java runtime and java compilers don't use JAVA_HOME.LinkedIn YouTube Facebook Twitter Products It's very non-intuitive, I've never seen a concise set of documentation on it, and I prefer to use brute force and ignore it.Īlternatives is actually what determines which Java compiler and runtime you'd get if you just typed "java" in at a shell prompt and hadn't set a specific PATH or used a fully-qualified execution pathname ( e.g., /usr/bin/java or /usr/java/latest/bin/java or something like /usr/java/jdk_1.23_00/bin/java. What alternatives does is permit multiple service providers to install on a system in ways that would otherwise conflict and allow selecting a specific alternative (hence the name) on a per-user basis. This image is maintained by Red Hat and updated regularly. This base image is freely redistributable, but Red Hat only supports Red Hat technologies through subscriptions for Red Hat products. Red Hat implemented a rather nasty system called "alternatives" which was originally designed for Ubuntu I think. The Universal Base Image is designed and engineered to be the base layer for all of your containerized applications, middleware and utilities. Although I prefer the RPM, since that way, Java also shows up in the system's installed applications (rpm) database and can be verified and repaired by the RPM tools, if necessary. So for the most part, you get about the same results downloading the ZIP and unzipping it to a /usr/java directory (which you can create if you need to), or in downloading the RPM and installing it. All this package does is copy the standard JRE or JDK fileset that is provided in the ZIP distros to the /usr/java directory and make some file aliases so that the Java files also appear to be in Linux-standard locations. When you install Java on a Red Hat/CentOS/Fedora or similar system, Oracle provides a RedHat Package Manager (RPM) file. So that you can set environment variables in one shell process and have them be inherited by child shells that it spawns (for example, to run a shell script). That, in fact is why the "export" statement exists. And note that unless the environment is shared, that setting will NOT change the JAVA_HOME values for any other shell process. In actuality, anyone can set/change JAVA_HOME any time they want and whatever the last setting was is the value that will be used until something changes it again. Depending on how your system is set up, it may be set from a central script (usually in a file somewhere under /etc), or from something like your login script (I (mis)use. The instructions below assume that you are using Configuring the JAVA environment ), alsa-lib-1.2.4, cpio-2.13, Cups-2.3.3, UnZip-6.0, Which-2.21, Xorg Libraries, and Zip-3. ![]() The implementation is licensed under the GPL-2.0-only with a linking exception. Download Size: 6.9 MB OpenJDK Dependencies Required Dependencies An existing binary ( Java-15.0.2 or an earlier built version of this package. It is the result of an effort Sun Microsystems began in 2006. It's a convention that many (but not all) Java application products use to determine which JDK or JRE to run under. OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). JAVA_HOME is neither an OS environment variable or even a Java environment variable. That set can be hard to track, since among other things, it depends on which shell you're running under (bash, zsh, ash, csh, and so forth). When a new shell is created via logon, the logon process itself invokes a number of system-wide and user-local scripts that can all add variables to the environment. That set will either be a complete set of its own or one inherited from a parent shell. Every shell instance in Linux has a set of environment variables.
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