If you already installed latest version of java such as 12 and you check the version of java, it still points to java 12 and not 11. However you can switch between different installed JDKs by setting JAVA_HOME environment variable and having the $JAVA_HOME\/bin in $PATH environment variable. <\/p>\n\n\n\n
You can also use a command line tool called jEnv<\/a><\/strong> to switch between different version of jdks. <\/p>\n\n\n\n What’s jEnv ? To install jEnv on mac using brew use following command:<\/p>\n\n\n\n Referring to Caveats section in above installation logs for jEnv, you will see something like following notes:<\/p>\n\n\n\n First you need to install git<\/strong> on your Linux\/Unix\/OS X machine. Click here<\/a> for more information on Working with<\/a> git cli<\/a><\/strong> tool<\/a>.<\/p><\/blockquote>\n\n\n\n If you have git cli<\/strong> command installed, clone jEnd github repository using following following command into ~\/.jenv<\/strong> folder<\/p>\n\n\n\n If you are using bash or zsh you need to go and add following lines into their profile ~\/.bash_profile or ~\/.zshrc accordingly<\/p>\n\n\n\n Exit the ssh session or logout the user session you are in and login again or you can simply reboot your OS.<\/p><\/blockquote>\n\n\n\n If everything is good, you should be able to see jenv<\/strong> version and cli help by running just jenv<\/strong> command like this:<\/p>\n\n\n\n Here is where you can find installed jdks in you Mojave macOS<\/p>\n\n\n\n And here are some example where you can find the installed JDK on your Linux machine. Following paths are in my Fedora 30<\/p>\n\n\n\n Using find<\/strong> command you can search for installed openjdk<\/strong> for example like this.<\/p>\n\n\n\n You should find it somewhere inside \/usr<\/strong> not \/etc or \/var folders. Also make sure you don’t want JRE you are looking for JDK path. In this example, here is the location, look it up in above find result.<\/p>\n\n\n\n Using jenv add<\/strong> you can add jdk path to jenv environment<\/p>\n\n\n\n Using jenv versions<\/strong> you can see the list of java versions installed on our mac<\/p>\n\n\n\n You can set your jdk globally<\/strong> using following command. <\/p>\n\n\n\n Make sure you open another shell after executing above command and check the version of java<\/p>\n\n\n\n Or you can set jdk for the current folder you are in using following command<\/p>\n\n\n\n If you check java -version when you are inside java01<\/strong> that you set jdk using jenv local<\/strong>, you will see the java version is 1.8<\/p>\n\n\n\n And if you somewhere else it will be still version 11<\/p>\n\n\n\n However you can specify the java version for specific shell window you opened. That means if you go to another window or close the shell that you set jdk version using jenv shell<\/strong>, it will go back and show the jdk gobal version<\/p>\n\n\n\n Here is the command to set shell instance version<\/p>\n\n\n\n And the version will be 12<\/p>\n\n\n\n If you already installed latest version of java such as 12 and you check the version of java, it still points to java 12 and not 11. However you can switch between different installed JDKs by setting JAVA_HOME environment variable and having the $JAVA_HOME\/bin in $PATH environment variable. You can also use a command line […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":609,"menu_order":6,"comment_status":"open","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-681","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/pages\/681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/comments?post=681"}],"version-history":[{"count":11,"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/pages\/681\/revisions"}],"predecessor-version":[{"id":791,"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/pages\/681\/revisions\/791"}],"up":[{"embeddable":true,"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/pages\/609"}],"wp:attachment":[{"href":"http:\/\/kabiliravi.com\/index.php\/wp-json\/wp\/v2\/media?parent=681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
jEnv is a command line tool to help you forget how to set the JAVA_HOME environment variable<\/p>https:\/\/www.jenv.be\/<\/a><\/cite><\/blockquote>\n\n\n\nMac OS X via Homebrew<\/a><\/h2>\n\n\n\n
$ brew install jenv\nUpdated 2 taps (homebrew\/cask and caskroom\/cask).\n No changes to formulae.\n==> Downloading https:\/\/github.com\/jenv\/jenv\/archive\/0.5.2.tar.gz\n==> Downloading from https:\/\/codeload.github.com\/jenv\/jenv\/tar.gz\/0.5.2\n ################################################################## 100.0%\n==> Caveats\n To activate jenv, add the following to your ~\/.zshrc:\n export PATH=\"$HOME\/.jenv\/bin:$PATH\"\n eval \"$(jenv init -)\"\n==> Summary\n ? \/usr\/local\/Cellar\/jenv\/0.5.2: 80 files, 70KB, built in 2 seconds<\/pre>\n\n\n\n
==> Caveats\n To activate jenv, add the following to your ~\/.zshrc:\n export PATH=\"$HOME\/.jenv\/bin:$PATH\"\n eval \"$(jenv init -)\"<\/pre>\n\n\n\n
Linux\/Unix\/OS X Installation by source code<\/h2>\n\n\n\n
$ git clone https:\/\/github.com\/gcuisinier\/jenv.git ~\/.jenv<\/pre>\n\n\n\n
Post jEnv Configurations<\/h2>\n\n\n\n
Bash<\/h4>\n\n\n\n
$ echo 'export PATH=\"$HOME\/.jenv\/bin:$PATH\"' >> ~\/.bash_profile \n$ echo 'eval \"$(jenv init -)\"' >> ~\/.bash_profile <\/pre>\n\n\n\n
Zsh<\/h4>\n\n\n\n
$ echo 'export PATH=\"$HOME\/.jenv\/bin:$PATH\"' >> ~\/.zshrc \n$ echo 'eval \"$(jenv init -)\"' >> ~\/.zshrc<\/pre>\n\n\n\n
Validating the Installation<\/h2>\n\n\n\n
$ jenv\n jenv 0.5.2-4-gd8ffd5b\n Usage: jenv \n []\n Some useful jenv commands are:\n commands List all available jenv commands\n local Set or show the local application-specific Java version\n global Set or show the global Java version\n shell Set or show the shell-specific Java version\n rehash Rehash jenv shims (run this after installing executables)\n version Show the current Java version and its origin\n versions List all Java versions available to jenv\n which Display the full path to an executable\n whence List all Java versions that contain the given executable\n add Add JDK into jenv. A alias name will be generated by parsing \"java -version\"\n See `jenv help \n' for information on a specific command.\n For full documentation, see: https:\/\/github.com\/hikage\/jenv#readme<\/pre>\n\n\n\n
Adding JDK path to jEnv<\/h2>\n\n\n\n
$ ls \/Library\/Java\/JavaVirtualMachines\/\njdk1.8.0_181.jdk jdk1.8.0_192.jdk openjdk-11.0.2.jdk openjdk-12.0.1.jdk<\/pre>\n\n\n\n
$ find \/ -name 'openjdk<\/em>'\n \/var\/lib\/alternatives\/jre_12_openjdk\n \/var\/lib\/alternatives\/jre_openjdk\n \/etc\/java\/java-12-openjdk\n \/etc\/java\/java-12-openjdk\/java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64\n \/etc\/alternatives\/jre_12_openjdk\n \/etc\/alternatives\/jre_openjdk\n \/usr\/lib\/jvm\/java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64\n \/usr\/lib\/jvm\/jre-12-openjdk\n \/usr\/lib\/jvm\/jre-openjdk\n \/usr\/lib\/jvm\/jre-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64\n \/usr\/share\/man\/man1\/pack200-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/java-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/keytool-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/jjs-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/rmid-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/unpack200-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/man\/man1\/rmiregistry-java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64.1.gz\n \/usr\/share\/icons\/hicolor\/32x32\/apps\/java-12-openjdk.png\n \/usr\/share\/icons\/hicolor\/48x48\/apps\/java-12-openjdk.png\n \/usr\/share\/icons\/hicolor\/16x16\/apps\/java-12-openjdk.png\n \/usr\/share\/icons\/hicolor\/24x24\/apps\/java-12-openjdk.png<\/pre>\n\n\n\n
\/usr\/lib\/jvm\/java-12-openjdk-12.0.1.12-1.rolling.fc30.x86_64<\/pre>\n\n\n\n
$ jenv add \/Library\/Java\/JavaVirtualMachines\/openjdk-12.0.1.jdk\/Contents\/Home\n$ jenv add \/Library\/Java\/JavaVirtualMachines\/openjdk-11.0.2.jdk\/Contents\/Home\n$ jenv add \/Library\/Java\/JavaVirtualMachines\/jdk1.8.0_192.jdk\/Contents\/Home<\/pre>\n\n\n\n
$ jenv versions\n system (set by \/Users\/youruser\/.jenv\/version)\n 1.8\n 1.8.0.192\n 11.0\n 11.0.2\n 12.0\n 12.0.1\n openjdk64-11.0.2\n openjdk64-12.0.1\n oracle64-1.8.0.192 <\/pre>\n\n\n\n
Configure global version<\/h4>\n\n\n\n
$ jenv global 11.0<\/pre>\n\n\n\n
$ java -version\nopenjdk version \"11.0.2\" 2019-01-15\nOpenJDK Runtime Environment 18.9 (build 11.0.2+9)\nOpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)<\/pre>\n\n\n\n
Configure local version (per directory)<\/h4>\n\n\n\n
~\/java01$ jenv local 1.8<\/pre>\n\n\n\n
~\/java01$ java -version\njava version \"1.8.0_192\"\nJava(TM) SE Runtime Environment (build 1.8.0_192-b12)\nJava HotSpot(TM) 64-Bit Server VM (build 25.192-b12, mixed mode)<\/pre>\n\n\n\n
~$ java -version openjdk version \"11.0.2\" 2019-01-15\nOpenJDK Runtime Environment 18.9 (build 11.0.2+9)\nOpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)<\/pre>\n\n\n\n
Configure shell instance version<\/h4>\n\n\n\n
$ jenv shell openjdk64-12.0.1<\/pre>\n\n\n\n
$ java -version\nopenjdk version \"12.0.1\" 2019-04-16\nOpenJDK Runtime Environment (build 12.0.1+12)\nOpenJDK 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)<\/pre>\n","protected":false},"excerpt":{"rendered":"