wget<\/code>:<\/p>\nwget https:\/\/download.oracle.com\/java\/19\/latest\/jdk-19_linux-x64_bin.deb<\/code><\/pre>\nOnce your .deb<\/code> package is downloaded, install it using apt<\/code>:<\/p>\nsudo apt install .\/jdk-19_linux-x64_bin.deb<\/code><\/pre>\nOnce installed, use the following commands to set these new packages for update-alternatives<\/code>:<\/p>\nsudo update-alternatives --install \/usr\/bin\/java java \/usr\/lib\/jvm\/jdk-19\/bin\/java 100\nsudo update-alternatives --install \/usr\/bin\/javac javac \/usr\/lib\/jvm\/jdk-19\/bin\/javac 100<\/code><\/pre>\nManaging Java Alternatives<\/h1>\n
If you've installed one or more Java versions, then you can use the update-alternatives<\/code> command to set the default version for your system.<\/p>\nTo select your default Java installation, run the following command:<\/p>\n
sudo update-alternatives --config java<\/code><\/pre>\nYou'll receive a list of the Java versions you currently have installed on your system:<\/p>\n
There are 2 choices for the alternative java (providing \/usr\/bin\/java).\n\n Selection Path Priority Status\n------------------------------------------------------------\n* 0 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/java 1111 auto mode\n 1 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/java 1111 manual mode\n 2 \/usr\/lib\/jvm\/jdk-19\/bin\/java 100 manual mode\n\nPress <enter> to keep the current choice[*], or type selection number: <\/code><\/pre>\nPress Enter<\/code> to leave the current option, or type the number of the Java version you want to set.<\/p>\nFor example, type in 2<\/code> and press Enter<\/code> to set the OracleJDK version.<\/p>\nYou can also use update-alternatives<\/code> to configure the default version of your Java compiler:<\/p>\nsudo update-alternatives --config javac<\/code><\/pre>\nYou should receive an output similar to the following:<\/p>\n
There are 2 choices for the alternative javac (providing \/usr\/bin\/javac).\n\n Selection Path Priority Status\n------------------------------------------------------------\n* 0 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/javac 1111 auto mode\n 1 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/javac 1111 manual mode\n 2 \/usr\/lib\/jvm\/jdk-19\/bin\/javac 100 manual mode<\/code><\/pre>\nAgain, choose 2<\/code> to use the OracleJDK compiler as your default compiler and press Enter<\/code>.<\/p>\nTo verify that Java was installed, check out its version:<\/p>\n
java -version<\/code><\/pre>\nYou should receive an output similar to the following:<\/p>\n
java version "19.0.1" 2022-10-18\nJava(TM) SE Runtime Environment (build 19.0.1+10-21)\nJava HotSpot(TM) 64-Bit Server VM (build 19.0.1+10-21, mixed mode, sharing)<\/code><\/pre>\nTo verify that the Java compiler was installed, check out its version:<\/p>\n
javac -version<\/code><\/pre>\nYou should receive an output similar to the following:<\/p>\n
javac 19.0.1<\/code><\/pre>\nConfiguring the Java Home Directory Environment Variable<\/h1>\n
Now that you've installed Java on your Ubuntu server, you need to to set up the $JAVA_HOME<\/code> environment variable, which is a variable used by many Java packages and software programs written in Java to determine where Java is installed.<\/p>\nFirst run the update-alternatives<\/code> to get the path of your current Java installation:<\/p>\nsudo update-alternatives --config java<\/code><\/pre>\nThis will list paths of your different Java installations, which will be similar to the following:<\/p>\n
0 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/java 1111 auto mode\n 1 \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/java 1111 manual mode\n 2 \/usr\/lib\/jvm\/jdk-19\/bin\/java 100 manual mode<\/code><\/pre>\nHere, OpenJDK is located at \/usr\/lib\/jvm\/java-11-openjdk-amd64\/bin\/java<\/code> and OracleJDK is located at \/usr\/lib\/jvm\/jdk-19\/bin\/java<\/code>.<\/p>\nChoose and copy a path depending on your requirements, then open the \/etc\/environment<\/code> file:<\/p>\nsudo nano \/etc\/environment<\/code><\/pre>\nAdd your path at the end of this file and assign it to a variable called JAVA_HOME<\/code>, excluding the \/bin\/java<\/code> portion, like so:<\/p>\nJAVA_HOME="\/usr\/lib\/jvm\/java-11-openjdk-amd64"<\/code><\/pre>\nSave and close \/etc\/environment<\/code>.<\/p>\nReload \/ect\/environment<\/code>:<\/p>\nsource \/etc\/environment<\/code><\/pre>\nNow check out the value of your Java Home variable:<\/p>\n
echo $JAVA_HOME<\/code><\/pre>\nThis should print the path you've set:<\/p>\n
\/usr\/lib\/jvm\/java-11-openjdk-amd64<\/code><\/pre>\nCongrats<\/h2>\n
You have now learned how to install Java on your Ubuntu system using two methods, one where you install the OpenJDK version available in your Ubuntu repositories, and one where you install the official OracleJDK. You've also learned how to install both versions and alternate between them as your requirements change.<\/p>\n","protected":false},"excerpt":{"rendered":"
Java is a high-level, object-oriented programming language. The JVM or Java\u2019s virtual machine, is a virtual machine that enables a computer to run Java and programs that are written in a language that can be compiled to Java bytecode such as Scala and Kotlin programs. Java and JVM are required for many DevOps tools such …<\/p>\n","protected":false},"author":19,"featured_media":7915,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[18,30],"tags":[186,187,185],"class_list":["post-7434","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","category-tutorials","tag-java","tag-jvm","tag-ubuntu"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/posts\/7434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/comments?post=7434"}],"version-history":[{"count":6,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/posts\/7434\/revisions"}],"predecessor-version":[{"id":13017,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/posts\/7434\/revisions\/13017"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/media\/7915"}],"wp:attachment":[{"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/media?parent=7434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/categories?post=7434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ssdnodes.com\/wp-json\/wp\/v2\/tags?post=7434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}