usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/home/seth/bin If you don't know what's in your PATH, take a look to find out: $ echo $PATH Instead, you choose a convenient place in your PATH. This is often called a "local" install because you're not installing Java to a "global" location. ![]() If you download a TAR file from either or Azul, you must install it manually. You can find downloads of OpenJDK at in the form of a tarball requiring manual installation, or you can download the Zulu Community edition from Azul in the form of a tarball or installable RPM or DEB packages. ![]() If you can't find a JRE or JDK in your repository, or the ones you find don't fit your needs, you can download open source Java packages from the internet. Search on OpenJDK and look for either the most recent JRE or JVM if you're a user and for the most recent JDK if you're a developer. There are probably many many Java-related packages in your repository. In this case, the default-jre package is appropriate for users, and the default-jdk is suitable for developers.įor example, to install the JRE on Debian: $ sudo apt install default-jre Here's a search for OpenJDK on Debian: $ sudo apt search openjdk | less If your distribution doesn't use the latest tag, it may use another keyword, such as default. Install Java on Fedora or similar with: $ sudo dnf install java-latest-openjdk Only if the application you're trying to run insists that you need a legacy version of Java should you look past the latest release. For example, on Fedora: $ sudo dnf search openjdk | \ Depending on what package manager you use, you might even consider using grep to filter the search results to include only the latest versions. Some distributions use the keyword latest to indicate the most recent version, which is usually what you need to run whatever application you're trying to run. Now that you know your choices, you can search for OpenJDK or IcedTea with your package manager and install the version you need. It's safest to develop on IcedTea or OpenJDK. If you opt for Oracle's version, be aware that there are proprietary plugins and fonts in the package, which could interfere with distributing your application. If you're a developer who needs to make the choice, then you should consider what components you need. ![]() Free online course: Developing cloud-native applications with microservices architectures.On Linux, you can have several different versions of Java installed all at once, and they won't interfere with one another. When an application tells you that you need Java 12, but your repository only has Java 8, it's fine to install whatever implementation of Java 12 you can find from a reliable source. If you feel overwhelmed by the choices, then the easy answer of which Java implementation you should install is whichever is easiest for you to install. The IcedTea project is essentially OpenJDK, but its goal is to make it easier for users to build and deploy OpenJDK when using fully free and open source tools. Oracle bundles proprietary components with its Java downloads, while the OpenJDK project is fully open source. Luckily, Java is an open source technology, so if you're not happy with the way Oracle maintains the project, you have other options. When Sun Microsystems was bought by Oracle, Java was a major part of the sale. What's the difference between OpenJDK, IcedTea, and OracleJDK? If you're a developer looking to program in Java, you need the JDK (which includes JRE libraries, which in turn includes a JVM).If you're a user looking to run a Java application, you only need the JRE (which includes a JVM).In terms of downloads, this translates to: The JDK includes the Java Runtime Environment (JRE). The Java Development Kit (JDK) is a development toolkit: you can think of it as a garage where tinkerers sit around making adjustments, repairs, and improvements. It's included in the Java Runtime Environment (JRE). The Java Virtual Machine (JVM) is a runtime component it's the "engine" that enables Java applications to launch and run on your computer. ![]() Java is broadly split into two downloadable categories. That means, before you can install anything, you have to decide which Java you want to install. Java is an open source language and specification, meaning that anyone can, in theory, create an implementation of it. The bad news is that Java is big, not so much in size as in scope. The good news is that you have many options, and this article covers them all. Because Java is such a popular backend for so many applications, it's good to understand the different ways you can install it. Sometimes you might find an application in an app store, or you might install it with a package manager like DNF on Fedora or Brew on Mac, and other times, you might download an executable or an installer from a website. No matter what operating system you're running, there are usually several ways to install an application.
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