Installing Dependencies

• On CentOS 7.6/openEuler 20.03:

  1	yum install java-1.8.0-openjdk-* tcl git gcc gcc-c++ make cmake libtool autoconf automake -y

• On CentOS 8.1:

  yum install -y java-1.8.0* tcl git wget gcc gcc-c++ make cmake libtool autoconf automake python2 python2-devel java-11-openjdk-devel

1. View the Java installation directory.

   find /usr/lib/jvm/  -name java

   Or

   find / -name java

   Or

   which java

   • On CentOS 7.6:

     ls /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.aarch64/bin/java

   • On openEuler 20.03:

     ls /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-7.oe1.aarch64/bin/java

2. Configure the environment variables: JAVA_HOME, JRE_HOME, CLASSPATH, and PATH.
   1. Open the profile file.

      vim /etc/profile

   2. Press i to enter the insert mode and add the content of the corresponding OS to the profile file.
      • On CentOS:

        export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.aarch64
        export JRE_HOME=$JAVA_HOME/jre
        export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
        export PATH=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.aarch64/bin:$PATH

      • On openEuler:

        export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-7.oe1.aarch64
        export JRE_HOME=$JAVA_HOME/jre
        export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
        export PATH=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-7.oe1.aarch64/bin:$PATH

   3. Press Esc, type :wq!, and press Enter to save the file and exit.
3. Make the environment variables take effect.

   source /etc/profile

4. View the environment variables.

   echo $JAVA_HOME

   echo $JRE_HOME

   echo $CLASSPATH

   echo $PATH

java -version