How to set Java environment path in Ubuntu

Question

I just installed JDK in Ubuntu with sudo apt-get install openjdk-6-jdk command  after the installation where s the Java bin directory located  And how can I set the environment path for that directory  I have little experience with Ubuntu  can anyone give some advice or suggest any good website for reference

User · Answer

All you have to do now is to set the    JAVA HOME    and    PATH    environment variables and then you are done  Enter the following commands to set your environment variables  Make sure that your environment variables point to a valid installation of JDK on your machine  For Ubuntu 18 04  the path is  usr lib jvm java-8-openjdk-amd64   export JAVA HOME  usr lib jvm java-8-openjdk-amd64   To check whether your JAVA HOME path has been successfully saved  enter the following command to check   echo  JAVA HOME

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Open file  etc environment with a text editor Add the line JAVA HOME   path to your java   Save and close then run source  etc environment

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It should put java in your path  probably in  usr bin java   The easiest way to find it is to open a term and type  which java

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You can install the default Ubuntu 17 10  java from apt   sudo apt install openjdk-8-jdk-headless    And it will set the PATH for you  if instead you need to install specific version of Java you can follow  this YouTube

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To set up system wide scope you need to use the    etc environment  file sudo gedit  etc environment   is the location where you can define any environment variable  It can be visible in the whole system scope  After variable is defined system need to be restarted   EXAMPLE     sudo gedit  etc environment   Add like following    PATH   usr local sbin  usr local bin  usr sbin  usr bin  sbin  bin  usr games  JAVA HOME   opt jdk1 6 0 45     Here is the site you can find more   http   peesquare com blogs environment-variable-setup-on-ubuntu

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To Set JAVA HOME   PATH for a single user  Login to your account and open  bash profile file    vi    bash profile   Set JAVA HOME as follows using syntax export JAVA HOME  lt path-to-java gt   If your path is set to  usr java jdk1 5 0 07 bin java  set it as follows   export JAVA HOME  usr java jdk1 5 0 07 bin java   Set PATH as follows   export PATH  PATH  usr java jdk1 5 0 07 bin   Feel free to replace  usr java jdk1 5 0 07 as per your setup  Save and close the file  Just logout and login back to see new changes  Alternatively  type the following command to activate the new path settings immediately     source    bash profile   OR         bash profile   Verify new settings     echo  JAVA HOME   echo  PATH   Tip  Use the following command to find out exact path to which java executable under UNIX   Linux     which java   Please note that the file    bashrc is similar  with the exception that    bash profile runs only for Bash login shells and  bashrc runs for every new Bash shell   To Set JAVA HOME   PATH for all user  You need to setup global config in  etc profile OR  etc bash bashrc file for all users     vi  etc profile   Next setup PATH   JAVA PATH variables as follows   export PATH  PATH  usr java jdk1 5 0 07 bin export PATH  PATH  usr java jdk1 5 0 07 bin   Save and close the file  Once again you need to type the following command to activate the path settings immediately     source  etc profile   OR       etc profile

User · Answer

open jdk once installed resides generally in your  usr lib java-6-openjdk As usual you would need to set the JAVA HOME  calsspath and Path In ubuntu 11 04 there is a environment file available in  etc where you need to set all the three paths   And then you would need to restart your system for the changes to take effect     Here is a site to help you around  http   aliolci blogspot com 2011 05 ubuntu-1104-set-new-environment html

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Java is typically installed in  usr java locate the version  you have and then do the following   Assuming you are using bash  if you are just starting off  i recommend bash over other shells  you can simply type in bash to start it   Edit your    bashrc file and add the paths as follows   for eg  vi    bashrc  insert following lines   export JAVA HOME  usr java  lt your version of java gt  export PATH   PATH    JAVA HOME  bin   after you save the changes  exit and restart your bash or just type in bash to start a new shell  Type in export to ensure paths are right   Type in java -version to ensure Java is accessible

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You need to set the  JAVA HOME variable  In my case while setting up Maven  I had to set it up to where JDK is installed   First find out where JAVA is installed     whereis java   java   usr bin java  usr share java  usr share man man1 java 1 gz  Now dig deeper-    ls -l  usr bin java   lrwxrwxrwx 1 root root 46 Aug 25  2018  etc alternatives java -   usr lib jvm java-8-openjdk-amd64 jre bin java Dig deeper     ls -l  usr lib jvm java-8-openjdk-amd64 jre bin java   -rwxr-xr-x 1 root root 6464 Mar 14 18 28  usr lib jvm java-8-openjdk-amd64 jre bin java  As it is not being referenced to any other directory  we ll use this   Open  etc environment using nano    sudo nano  etc environment   Append the following lines     JAVA HOME  usr lib jvm java-1 8 0-openjdk-amd64      export JAVA HOME   Reload PATH using       etc environment   Now      echo  JAVA HOME   Here is your output    usr lib jvm java-1 8 0-openjdk-amd64  Sources I referred to   https   askubuntu com a 175519  https   stackoverflow com a 23427862 6297483

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Ubuntu installs openjdk6 to  usr lib jvm java-6-openjdk path  So you will have the bin in  usr lib jvm java-6-openjdk bin  Usually the classpath is automatically set for the java  amp  related executables

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Create Open    bashrc file  vim    bashrc Add  JAVA HOME and PATH as refering to your JDK path export JAVA HOME  usr java  lt your version of java gt  export PATH   PATH    JAVA HOME  bin  Save file Now type java - version it should display what you set in  bashrc file  This will persisted over session as wel  Example

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Step1   sudo gedit    bash profile   Step2   JAVA HOME  home user tool jdk-8u201-linux-x64 jdk1 8 0 201 PATH  PATH  HOME bin  JAVA HOME bin export JAVA HOME export JRE HOME export PATH   Step3   source    bash profile

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Let me Simplify   first download JDK from Oracle Website   Link  2  Then Extract it   3  Create a folder  jvm  in  usr lib  i e  usr lib jvm  4  move the extracted folder from the jdk to  usr lib jvm     Note   use terminal   sudo   mv command i e  sudo mv     5  Create a  sh file at  etc profile d  eg   etc profile d myenvvar sh  6  In the  sh file type      export JAVA HOME  usr lib jvm jdk1 7 0      export PATH  PATH  JAVA HOME bin    Note   use terminal   gedit and sudo eg  sudo gedit myenvvar sh  7  Turn Off the Computer  after all these steps and Restart it  8 Open Terminal   and type      java -version   9  Check the output   then type     echo  JAVA HOME   10  Check the output and be happy

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Open terminal  Ctrl Alt t  Type   sudo gedit  bashrc   Enter password of ubuntu user Go to last line of the file Type below code in new line  export JAVA HOME enter java path here export PATH  JAVA HOME bin  PATH eg  export JAVA HOME  home pranav jdk1 8 0 131     export PATH  JAVA HOME bin  PATH  Save the file Type   source    bashrc   in terminal Done

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I have a Linux Lite 3 8  It bases on Ubuntu 16 04 LTS  and a path change in the following file  with root privileges  with restart has helped    etc profile d jdk sh

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How to install java packages   Install desired java version   versions using official ubuntu packages  which are managed using alternatives  sudo apt install -y openjdk-8-jdk or and other version   sudo apt install -y openjdk-11-jdk        Above answers are correct only when you have only one version for all software on your machine  and you can skip using update-alternatives  So one can quickly  hardcode it in  bashrc or some other place  export JAVA HOME  usr lib jvm java-1 8 0-openjdk-amd64 but it s not healthy  as later on you may change the version   Correct way to set JAVA HOME  and optionally JAVA SDK  JAVA JRE    The correct way  and mandatory when you have more than one   is to detect what update-alternative is pointing to  and always use update-alternatives to switch active version   Here are the suggestions for both  only specific unix account or for all accounts  machine level    1  for a specific unix account only   Use this if you don t have permissions to do it at machine level   cat  lt  lt  EOF   gt  gt    bashrc  export JAVA HOME   update-alternatives --query java   grep Value   cut -d    -f2   sed  s         jre        1 g   export JDK HOME   JAVA HOME  export JRE HOME   JDK HOME  jre   EOF   2  To do it at machine level  and for all bourne shells  you need 2 steps   2 a      cat  lt  lt  EOF    sudo tee  etc profile d java home env sh  gt  dev null  export JAVA HOME   update-alternatives --query java   grep Value   cut -d    -f2   sed  s         jre        1 g   export JDK HOME   JAVA HOME  export JRE HOME   JDK HOME  jre   EOF   As your shell might not be set as interactive by default  you may want to do this also  2 b       cat  lt  lt  EOF    sudo tee -a  etc bash bashrc  gt  dev null if   -d  etc profile d    then   for i in  etc profile d   sh  do     if   -r  i    then          i     fi   done   unset i fi EOF   PS  There should be no need to update the  PATH  as update-alternatives takes care of the link to  usr bin   More on  https   manpages ubuntu com manpages trusty man8 update-alternatives 8 html

User · Answer

Set java version from the list of installed  For see the list of the installed version run following command   update-java-alternatives --list   Then set your java version according to the following command   sudo update-java-alternatives --set  usr lib jvm java-1 8 0-openjdk-amd64

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if you have intalled only openJDK  the you should update your links  because you can have some OpenJDK intallation   sudo update-alternatives --config java   after this   gedit    bashrc   add the following line in the file  JAVA HOME  usr lib jvm YOUR JAVA VERSION  export PATH  PATH  JAVA HOME bin  export JAVA HOME  you can get you java version with  java -version

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Installation of Oracle Java    Donwload the tarball  tar file  from Oracle website unzip it by sudo tar -xvpzf fileName -C  installation folder name change the files permission and ownership add the following two lines in  etc profile   export JAVA HOME  home abu Java jdk1 8 0 45  export PATH  JAVA HOME bin  PATH   restart the machine and check by java -version and javac -version

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Update bashrc file to add JAVA HOME  sudo nano    bashrc Add JAVA HOME to bashrc file   export JAVA HOME  usr java  lt your version of java gt  export PATH   PATH    JAVA HOME  bin Ensure Java is accessible  java -version In Case of Manual installation of JDK  If you got an error as shown below   Error occurred during initialization of VM java lang NoClassDefFoundError  java lang Object  Execute the following command in your JAVA HOME lib directory   unpack200 -r -v -l    tools pack tools jar Execute the following commands in your JAVA HOME jre lib        bin unpack200 rt pack rt jar       bin unpack200 jsse pack jsse rar       bin unpack200 charsets pack charsets jar Ensure Java is accessible  java -version

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set  environment variables as follows  Edit the system Path file  etc profile  sudo gedit  etc profile   Add following lines in end  JAVA HOME  usr lib jvm jdk1 7 0 PATH  PATH  HOME bin  JAVA HOME bin export JAVA HOME export JRE HOME export PATH   Then Log out and Log in ubuntu for setting up the paths

[ubuntu] How to set Java environment path in Ubuntu

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