Question 26890 in CentOS Question posted in
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Force to use specific version of JAVA in centos

There are 2 instances of java version on my VM and I want to force to use java "java-1.8.0-openjdk" using shell script.

# sudo alternatives --config java

There are 2 programs which provide 'java'.
  Selection    Command
-----------------------------------------------
*  1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-2.el8_5.x86_64/jre/bin/java)
 + 2           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.13.0.8-4.el8_5.x86_64/bin/java)

I tried below :

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-2.el8_5.x86_64/
export JAVA_HOME
export PATH=$PATH:$JAVA_HOME
java -version

o/p: openjdk version "11.0.13" 2021-10-19 LTS

Help here would be really appreciated.

Tags:

2

Answers


  1. 0

    Suggesting to try again with this:

    JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-2.el8_5.x86_64/
export JAVA_HOME
export PATH=$PATH:$JAVA_HOME/bin
java -version

    The difference in the the 3rd line. Added /bin to path.

    If not working try (thanks to comment from @Jeff Schallerr):

    JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.312.b07-2.el8_5.x86_64/
export JAVA_HOME
export PATH=$PATH:$JAVA_HOME/jre/bin
java -version

    In your question you specify a very specific Java version. The java version are automatically updated when there is a Linux update.

    Fixing your Java version is bad practice.

    In folder /usr/lib/jvm there are a soft links to current JVM.
    Probably /usr/lib/jvm/jre-1.8.0

    Suggesting to inspect the Java version installed in your system:

    ls -l /usr/lib/jvm

    In order to set JAVA_HOME to the current Java version.

    JAVA_HOME=/usr/lib/jvm/jre-1.8.0
export JAVA_HOME
export PATH=$JAVA_HOME/bin:$PATH
which java
java -version
$JAVA_HOME/bin/java -version

    Now change the order to the PATH and test again:

    JAVA_HOME=/usr/lib/jvm/jre-1.8.0
export JAVA_HOME
export PATH=$PATH:$JAVA_HOME/bin
which java
java -version
$JAVA_HOME/bin/java -version

    There is difference in PATH. Hope you can appreciate the PATH mechanism.

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  2. 0

    First check whether your bashrc java path is override by another shell script’s java path in somewhere. Print the $PATH and verify java 11 path is not included in there. If java 11 path also included in $PATH before java 8 it is override in shell script in somewhere.

    echo $PATH

    Check whether $JAVA_HOME variable in .bash_profile, /home/.profile, etc/.profile shell scripts. (Or else grep ‘java-11-openjdk-11.0.13.0.8-4.el8_5.x86_64/bin/java’ and find the shell scripts where the $JAVA_HOME configured by java 11 and it found remove those)

    Then reboot the machine and try sudo alternatives --config java again

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