Select the JDK on a per-application basis by setting JAVA_HOME.

Switch java and javac binaries system wide via alternatives.

There are two ways to select the Java version you want: OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) OpenJDK Runtime Environment (build 1.8.0_181-b13) That’s why you get this output when running java -version on a fresh RHEL 8 install: At this point in time, JDK 8 is the main JDK on RHEL 8. In the previous step, we installed JDK 8 and JDK 11 in parallel. $ sudo yum install java-1.8.0-openjdk-devel java-11-openjdk-devel maven If you already know that RHEL packages are OpenJDK builds, yum list available might be useful too:įor the purpose of this article, we are going to install JDK 8 and JDK 11 in parallel, and also install maven: The -devel packages will pull in -headless packages as a dependency. For the purpose of this article, we’re interested in the development kits, so we’ll install the -devel sub-packages instead. This command tells us that packages java-1.8.0-openjdk-headless and java-11-openjdk-headless both provide the java binary. In order to figure out which RPM packages to install, we can ask the packaging system which ones provide the java binary:

Let's consider we have a freshly commissioned Red Hat Enterprise Linux 8 machine and we'd like to use it for running Java applications. If you prefer to watch a short 4 minute demo video, here it is: Yes, with JDK 11 you can directly run Java source files. $ /usr/lib/jvm/java-11-openjdk/bin/java HelloWorld.java

Then run Java “Hello World” as follows: $ cat > HelloWorld.java HelloWorld.java < download jdk kit 11

$ sudo yum install java-1.8.0-openjdk-devel To install JDK 8, use: (If you didn't select Make this user administrator during install see this article to enable sudo on RHEL) Through this article, you’ll learn how to install and run simple Java applications on RHEL 8, how to switch between two parallel installed major JDK versions via alternatives and how to select one of the two JDKs on a per-application basis. JDK 8 and JDK 11 refer to Red Hat builds of OpenJDK 8 and OpenJDK 11 respectively. In this article, I’ll refer to Java 8 as JDK (Java Development Kit) 8 since we are focusing on the development aspect of using Java. With Red Hat Enterprise Linux (RHEL) 8, two major versions of Java will be supported: Java 8 and Java 11.

Download jdk kit 11