JAVA HOME and PATH are set but java -version still shows the old one

Question

I am using Linux Mint Cinnamon 14  I have set the  JAVA HOME and  PATH environment variables in    profile as follows   export JAVA HOME  home aqeel development jdk jdk1 6 0 35 export PATH  home aqeel development jdk jdk1 6 0 35 bin  PATH   I then did source    profile to make the proper changes   When I execute java -version command to check the active java version  it shows the default  already installed open-jdk  java version  How can I override the default open-jdk with the one I downloaded   UPDATE   which java says  usr bin java   JAVA HOME bin java -version says  Permission Denied   sudo  JAVA HOME bin java -version  asks for password  then  says Command not found  but cd  JAVA HOME bin  and ls shows that it is right directory

User · Answer

In Linux Mint 18 Cinnamon be sure to check  etc profile d jdk home sh I renamed this file to jdk home sh old and now my path does not keep getting overridden and I can call java -version and see Java 9 as expected  Even though I correctly selected Java 9 in update-aternatives --config java this jdk home sh file kept overriding the  PATH on boot-up

User · Answer

While it looks like your setup is correct  there are a few things to check    The output of env - specifically PATH  command -v java tells you what  Is there a java executable in  JAVA HOME bin and does it have the execute bit set  If not chmod a x java it    I trust you have source d your  profile after adding changing the JAVA HOME and PATH   Also  you can help yourself in future maintenance of your JDK installation by writing this instead   export JAVA HOME  home aqeel development jdk jdk1 6 0 35 export PATH  JAVA HOME bin  PATH   Then you only need to update one env variable when you setup the JDK installation   Finally  you may need to run hash -r to clear the Bash program cache  Other shells may need a similar command   Cheers

User · Answer

Updating the    profile or    bash profile does not work sometimes  I just deleted JDK 6 and sourced  bash profile    Try running this   sudo rm -rd jdk1 6 0    it may not let you delete without sudo   Then  modify add your JAVA HOME and PATH variables   source    bash profile  assuming you ve updated  JAVA HOME and  PATH

User · Answer

There is an easy way  just remove the symbolic link from   usr bin   It will work

User · Answer

If you want to use JDKs downloaded from Oracle s site  what worked for me  using Mint  is using update-alternatives    I downloaded the JDK and extracted it just anywhere  for example in  home aqeel development jdk jdk1 6 0 35 I ran   sudo update-alternatives --install  usr bin java java  home aqeel development jdk jdk1 6 0 35 bin java 1   Now you can execute sudo update-alternatives --config java and choose your java version  This doesn t set the JAVA HOME variable  which I wanted configured  so I just added it to my    bashrc  including an export JAVA HOME   home aqeel development jdk jdk1 6 0 35  statement   Now  I had two JDKs downloaded  let s say the second has been extracted to  home aqeel development jdk jdk-10 0 1    How can we change the JAVA HOME dynamically based on the current java being used   My solution is not very elegant  I m pretty sure there are better options out there  but anyway    To change the JAVA HOME dynamically based on the chosen java alternative  I added this snippet to the    bashrc   export JAVA HOME   update-alternatives --query java   grep Value    awk -F Value      print  2     awk -F  bin java    print  1       Finally  this is out of the scope  if you have to change the java version constantly  you might want to consider    Adding an alias to your    bash aliases   alias change-java  sudo update-alternatives --config java      You might have to create the file and maybe uncomment the section related to this in    bashrc

User · Answer

check available Java versions on your Linux system by using update-alternatives command      sudo update-alternatives --display java   Now that there are suitable candidates to change to  you can switch the default Java version among available Java JREs by running the following command      sudo update-alternatives --config java   When prompted  select the Java version you would like to use 1 or 2 or 3 or etc    Now you can verify the default Java version changed as follows      java -version

User · Answer

JAVA HOME bin java -version says  Permission Denied    If you cannot access or run code  it which be ignored if added to your path  You need to make it accessible and runnable or get a copy of your own   Do an   ls -ld  JAVA HOME  JAVA HOME bin  JAVA HOME bin java   to see why you cannot access or run this program

User · Answer

When it searches for java it looks from left to right in path entries which are separated by   so you need to add the path of latest jdk bin directory before  usr bin  so when it searches it ll find the latest one and stop searching further   i e  PATH  usr java jdk 1 8 bin  usr bin       and so on   then initialize user profile using command   source    bash profile  and check with   which java   you ll get the right one

User · Answer

Try this    export JAVA HOME put here your java home path type export PATH  JAVA HOME bin  PATH  ensure that  JAVA HOME is the first element in PATH  try java -version   Reason  there could be other PATH elements point to alternative java home  If you put first your preferred JAVA HOME  the system will use this one

User · Answer

update-java-alternatives   The java executable is not found with your JAVA HOME  it only depends on your PATH   update-java-alternatives is a good way to manage it for the entire system is through   update-java-alternatives -l   Sample output   java-7-oracle 1  usr lib jvm java-7-oracle java-8-oracle 2  usr lib jvm java-8-oracle   Choose one of the alternatives   sudo update-java-alternatives -s java-7-oracle   Like update-alternatives  it works through symlink management  The advantage is that is manages symlinks to all the Java utilities at once  javac  java  javap  etc   I am yet to see a JAVA HOME effect on the JDK  So far  I have only seen it used in third-party tools  e g  Maven

[java] JAVA_HOME and PATH are set but java -version still shows the old one

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