How to set JAVA HOME in Linux for all users

Question

I am new to Linux system and there seem to be too many Java folders    java -version gives me    java version  1 7 0 55  OpenJDK Runtime Environment  rhel-2 4 7 1 el6 5-x86 64 u55-b13  OpenJDK 64-Bit Server VM  build 24 51-b03  mixed mode    When I am trying to build a Maven project   I am getting error   Error  JAVA HOME is not defined correctly  We cannot execute  usr java jdk1 7 0 05 bin java   Could you please tell me which files I need to modify for root as well as not-root user and where exactly is java located

User · Answer

The answer is given previous posts is valid. But not one answer is complete with respect to:

Changing the /etc/profile is not recommended simply because of the reason (as stated in /etc/profile):

It's NOT a good idea to change this file unless you know what you are doing. It's much better to create a custom.sh shell script in /etc/profile.d/ to make custom changes to your environment, as this will prevent the need for merging in future updates.*

So as stated above create /etc/profile.d/custom.sh file for custom changes.
Now, to always keep updated with newer versions of Java being installed, never put the absolute path, instead use:

#if making jdk as java home

export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")

OR

#if making jre as java home

export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:/bin/java::")

And remember to have #! /bin/bash on the custom.sh file

User · Answer

This is a very simple script to solve the problem  export JAVA HOME BIN  which java  export JAVA HOME DIR  dirname  JAVA HOME BIN  export JAVA HOME  dirname  JAVA HOME DIR    And for testing   echo  JAVA HOME

User · Answer

Doing what Oracle does  as a former Sun Employee I can t get used to that one   ln -s latestJavaRelease  usr java default Where latestJavaRelease is the version that you want to use  then export JAVA HOME  usr java default

User · Answer

For all users  I would recommend placing the following line in  etc profile  export JAVA HOME   readlink -f  usr bin javac   sed  s  bin javac       This will update dynamically and works well with the alternatives system  Do note though that the update will only take place in a new login shell

User · Answer

In  etc profile   if you open that will you   ll get to know that IT IS no recommended to write on that file  Instead of that make a script of your commands suppose test sh go to  etc profile d folder and Put test sh there  Every time you instance reboot it   ll be automatically called by  etc profile

User · Answer

None of the other answers were  sticking  for me in RHEL 7  even setting JAVA HOME and PATH directly in  etc profile or    bash profile would not work  Each time I tried to check if JAVA HOME was set  it would come up blank     echo  JAVA HOME       lt -- no output    What I had to do was set up a script in  etc profile d jdk home sh      bin sh export JAVA HOME  opt ibm java-x86 64-60  export PATH  JAVA HOME bin  PATH   I initially neglected the first line  the    bin sh   and it won t work without it   Now it s working     echo  JAVA HOME  opt ibm java-x86 64-60

User · Answer

It s Very easy to set a path in Linux  Do as follows    Step-1 Open terminal and type  sudo gedit  bashrc  Step-2 It will ask you your password  After typing the password  it will open the bash file  Then go to end  and type below   step-3      export JAVA HOME   usr lib jvm java-8-openjdk-amd64      export PATH  PATH  JAVA HOME bin   step-4  Then save the file and exit from file  Above is for a single user  For all users  you have to follow below steps  Step-1 gedit  etc profile  Step-2  export JAVA HOME   usr lib jvm java-8-openjdk-amd64    Step-3 export PATH  PATH  JAVA HOME bin  Hope this helps  Thanks

User · Answer

find  usr lib jvm java-1 x x-openjdk vim  etc profile  Prepend sudo if logged in as not-privileged user  ie  sudo vim Press  i  to get in insert mode add   export JAVA HOME  path that you found   export PATH  JAVA HOME bin  PATH  logout and login again  reboot  or use source  etc profile to apply changes immediately in your current shell

User · Answer

On Linux I add this line to my    profile   export JAVA HOME   readlink -ze  usr bin javac   xargs -0 dirname -z   xargs -0 dirname

User · Answer

Use SDKMAN sdkman io to switch btw  your sdk s   It sets the JAVA HOME for you

User · Answer

All operational steps finding java  parent dir  editing file      one solution  zFileProfile   etc profile  zJavaHomePath   readlink -ze   which java    xargs -0 dirname   xargs -0 dirname  echo  zJavaHomePath  echo  export JAVA HOME     zJavaHomePath      gt  gt   zFileProfile echo  export PATH   PATH   JAVA HOME bin   gt  gt   zFileProfile   Result     tail -2  zFileProfile export JAVA HOME   usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64  export PATH  PATH  JAVA HOME bin   Explanation   1  Let s break the full command into pieces    readlink -ze   which java    xargs -0 dirname   xargs -0 dirname    2  Find java path from java command      which java    usr bin java    3  Get relative path from symbolic path    readlink -ze  usr bin java   usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64 bin java    4  Get parent path of  usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64 bin java    readlink -ze  usr bin java   xargs -0 dirname   usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64 bin    5  Get parent path of  usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64 bin     readlink -ze  usr bin java   xargs -0 dirname   xargs -0 dirname   usr lib jvm java-11-openjdk-11 0 7 10-1 el8 1 x86 64

User · Answer

open kafka-run-class sh with sudo to write  you can find kafka-run-class sh in your kafka folder   kafka bin kafka-run-class sh  check for these lines    Modify the JAVA variable in the else part to point to the java executable in your java bin  like JAVA   JAVA HOME java

User · Answer

1   Using the short cut Ctlr   Alt   T to open terminal  2   Execute the below command   echo export JAVA HOME    readlink -f  usr bin javac   sed  s  bin javac        sudo tee  etc profile d jdk home sh  gt   dev null   3    Recommended  Restart your VM   computer  You can use source  etc source if don t want to restart computer  4   Using the short cut Ctlr   Alt   T to open terminal  5   Verified JAVA HOME installment with   echo  JAVA HOME     One-liner copy from flob  credit to them

User · Answer

Posting as answer  as I don t have the privilege to comment   Point to note  follow the accepted answer posted by  That Dave Guy    After setting the variables  make sure you set the appropriate permissions to the java directory where it s installed   chmod -R 755  usr java

User · Answer

I use the line   export JAVA HOME   readlink -f   dirname   readlink -f   which java            to my    profile so it uses the base of the default java directory at login time  This is for bash

User · Answer

You could use  etc profile or better a file like  etc profile d jdk home sh  export JAVA HOME  usr java jdk1 7 0 05    You have to remember that this file is only loaded with new login shells   So after bash -l or a new gnome-session and that it doesn t change with new Java versions

User · Answer

While we are up to setting JAVA HOME  let me share some benefits of setting JAVA HOME or any other environment variable   1  It s easy to upgrade JDK without affecting your application startup and config file which points to JAVA HOME  you just need to download new version and make sure your JAVA HOME points to new version of Java  This is best benefit of using environment variable or links   2  JAVA HOME variable is short and concise instead of full path to JDK installation directory   3  JAVA HOME variable is platform independence i e  if your startup script uses JAVA HOME then it can run on Windows and UNIX without any modification  you just need to set JAVA HOME on respective operating system   Read more  http   javarevisited blogspot com 2012 02 how-to-set-javahome-environment-in html ixzz4BWmaYIjH

User · Answer

Probably a good idea to source whatever profile you edit to save having to use a fresh login   either  source  etc  or    etc   Where  is whatever profile you edited

User · Answer

Step 1 - check the current java version by   echo  JAVA HOME   Step 2 - vim  etc profile  Step 3 - At the end of file you will find export JAVA HOME  we need to provide the new path here  make sure that it is not relative   Step 4 - Save and exit  wq  Step 5 -  source  etc profile    this would execute the change  Step 6 - Again do a echo  JAVA HOME - change would have been reflected

User · Answer

Copy the bin file path you installed  YOUR PATH   open terminal and edit environment file by typing following command   sudo nano  etc environment   In this file  add the following line  replacing YOUR PATH by the just copied path    JAVA HOME  YOUR PATH    That should be enough to set the environment variable  Now reload this file   source  etc environment   now test it by executing   echo  JAVA HOME

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