{"id":1788,"date":"2023-02-15T12:30:00","date_gmt":"2023-02-15T18:30:00","guid":{"rendered":"https:\/\/www.linuxcloudvps.com\/blog\/?p=1788"},"modified":"2023-08-29T08:54:09","modified_gmt":"2023-08-29T13:54:09","slug":"how-to-install-and-manage-multiple-java-versions-on-linux","status":"publish","type":"post","link":"https:\/\/www.linuxcloudvps.com\/blog\/how-to-install-and-manage-multiple-java-versions-on-linux\/","title":{"rendered":"How to Install and Manage Multiple Java Versions on Linux"},"content":{"rendered":"\n<p>In this tutorial, we are going to show you how to install and manage multiple Java versions on a Linux server.<\/p>\n\n\n\n<p>Java is an object-oriented web programming language used in thousands of applications worldwide and has a huge community of developers and regular users. Java is divided into two types OpenJDK and Oracle JDK. OpenJDK is a free and open-source implementation of the Java SE Platform Edition. Oracle JDK is the closed-source version of Java developed by Oracle. This tutorial will use the latest Ubuntu 22.04 OS, but you can choose any Linux distro. Java is compatible with all <a href=\"https:\/\/www.linuxcloudvps.com\/\" title=\"\">Linux distros<\/a>.<\/p>\n\n\n\n<p>Installing multiple versions of Java and switching between them is a straightforward process. Let&#8217;s get things done!<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A server with Ubuntu 22.04 as OS<\/li>\n\n\n\n<li>User privileges: root or non-root user with sudo privileges<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1. Update the System<\/h2>\n\n\n\n<p>Before we start with the installation of Java, we must update the system packages to their latest versions.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt-get update -y &amp;&amp; sudo apt-get upgrade -y<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2. Install OpenJDK Java 17<\/h2>\n\n\n\n<p>The Java OpenJDK version 17 is, by default, included in the Ubuntu 22.04 repo. To install it you can execute the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt-get install openjdk-17-jdk openjdk-17-jre<\/pre>\n\n\n\n<p>Once installed, execute the following command to check the Java version:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java -version<\/pre>\n\n\n\n<p>You will receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# java -version\nopenjdk version \"17.0.5\" 2022-10-18\nOpenJDK Runtime Environment (build 17.0.5+8-Ubuntu-2ubuntu122.04)\nOpenJDK 64-Bit Server VM (build 17.0.5+8-Ubuntu-2ubuntu122.04, mixed mode, sharing)\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3. Install OpenJDK Java 18<\/h2>\n\n\n\n<p>The Java OpenJDK version 18 is already included in the Ubuntu 22.04 repo. So we install it, we need to execute the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt-get install -y openjdk-18-jdk<\/pre>\n\n\n\n<p>Once installed, execute the following command to check the Java version:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java -version<\/pre>\n\n\n\n<p>You will receive the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# java -version\nopenjdk version \"18.0.2-ea\" 2022-07-19\nOpenJDK Runtime Environment (build 18.0.2-ea+9-Ubuntu-222.04)\nOpenJDK 64-Bit Server VM (build 18.0.2-ea+9-Ubuntu-222.04, mixed mode, sharing)<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4. Install Oracle JDK Java 17<\/h2>\n\n\n\n<p>We will install the second type of Java, Oracle version 17. To do that, first install some dependencies:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt-get install gnupg2 software-properties-common&lt;\/pre<\/pre>\n\n\n\n<p>Next, add the Java repo with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">add-apt-repository ppa:linuxuprising\/java<\/pre>\n\n\n\n<p>Once the repo is added to install Java Oracle 17, execute the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo apt-get install oracle-java17-installer -y<\/pre>\n\n\n\n<p>Now, the Java Oracle version is installed, and you can check it with the <strong>java -version<\/strong> command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# java -version\njava version \"17.0.1\" 2021-10-19 LTS\nJava(TM) SE Runtime Environment (build 17.0.1+12-LTS-39)\nJava HotSpot(TM) 64-Bit Server VM (build 17.0.1+12-LTS-39, mixed mode, sharing)\n<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5. Switch between different Java versions<\/h2>\n\n\n\n<p>Currently, there are three different versions installed on our server. To easily manage and switch between them, you need to execute the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">update-alternatives --config java<\/pre>\n\n\n\n<p>You will get the following output:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# update-alternatives --config java\nThere are 3 choices for the alternative java (providing \/usr\/bin\/java).\n\n  Selection    Path                                         Priority   Status\n------------------------------------------------------------\n  0            \/usr\/lib\/jvm\/java-18-openjdk-amd64\/bin\/java   1811      auto mode\n  1            \/usr\/lib\/jvm\/java-17-openjdk-amd64\/bin\/java   1711      manual mode\n  2            \/usr\/lib\/jvm\/java-17-oracle\/bin\/java          1091      manual mode\n* 3            \/usr\/lib\/jvm\/java-18-openjdk-amd64\/bin\/java   1811      manual mode\n\nPress  to keep the current choice[*], or type selection number:<\/pre>\n\n\n\n<p>You just need to type the number of the listed Java version and hit Enter. Let&#8217;s type <strong>1<\/strong> so we can use the <strong>Java OpenJDK 17<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Press  to keep the current choice[*], or type selection number: &lt;strong&gt;1&lt;\/strong&gt;\nupdate-alternatives: using \/usr\/lib\/jvm\/java-17-openjdk-amd64\/bin\/java to provide \/usr\/bin\/java (java) in manual mode\n<\/pre>\n\n\n\n<p>Now, you are using Java OpenJDK 17 as the default java on the system. You can check this with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java -version<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">The output will be the same as in Step 2. in this tutorial:<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# java -version\nopenjdk version \"17.0.5\" 2022-10-18\nOpenJDK Runtime Environment (build 17.0.5+8-Ubuntu-2ubuntu122.04)\nOpenJDK 64-Bit Server VM (build 17.0.5+8-Ubuntu-2ubuntu122.04, mixed mode, sharing)<\/pre>\n\n\n\n<p>You can execute again the command <strong>update-alternatives &#8211;config java<\/strong>, and you will see the active Jave version:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">root@host:~# update-alternatives --config java\nThere are 3 choices for the alternative java (providing \/usr\/bin\/java).\n\n  Selection    Path                                         Priority   Status\n------------------------------------------------------------\n  0            \/usr\/lib\/jvm\/java-18-openjdk-amd64\/bin\/java   1811      auto mode\n&lt;strong&gt;* 1            \/usr\/lib\/jvm\/java-17-openjdk-amd64\/bin\/java   1711      manual mode&lt;\/strong&gt;\n  2            \/usr\/lib\/jvm\/java-17-oracle\/bin\/java          1091      manual mode\n  3            \/usr\/lib\/jvm\/java-18-openjdk-amd64\/bin\/java   1811      manual mode\n\nPress  to keep the current choice[*], or type selection number:\n<\/pre>\n\n\n\n<p>Our aim with today&#8217;s article is to simplify the process of installing and managing multiple Java versions for you. <\/p>\n\n\n\n<p>Now it&#8217;s your turn to share your thoughts. <\/p>\n\n\n\n<p>Is there something you believe we missed or any steps that have left you puzzled and needing more information? What other topics or how-to guides would you like us to provide? <\/p>\n\n\n\n<p>Your opinion matters to us, so don&#8217;t hesitate to leave a comment below.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we are going to show you how to install and manage multiple Java versions on a Linux server. Java is an object-oriented web programming language used in thousands of applications worldwide and has a huge community of developers and regular users. Java is divided into two types OpenJDK and Oracle JDK. OpenJDK &#8230; <a title=\"How to Install and Manage Multiple Java Versions on Linux\" class=\"read-more\" href=\"https:\/\/www.linuxcloudvps.com\/blog\/how-to-install-and-manage-multiple-java-versions-on-linux\/\" aria-label=\"More on How to Install and Manage Multiple Java Versions on Linux\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":1789,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[260,13],"tags":[150,27,34],"class_list":["post-1788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-tutorials","tag-java","tag-linux","tag-linux-cloud-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Install and Manage Multiple Java Versions on Linux | LinuxCloudVPS Blog<\/title>\n<meta name=\"description\" content=\"In this tutorial, we are going to show you how to install and manage multiple Java versions on a Linux server. 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