Installing the Dependencies

Download and install the dependencies.

       
            yum install java-1.8.0-openjdk-* vim  -y

Configure Java.

View the Java installation directory.

find /usr/lib/jvm/ -name java

Alternatively,

find / -name java

Alternatively,

which java

CentOS:

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

openEuler:

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

Configure the environment variables: JAVA_HOME, JRE_HOME, CLASSPATH, and PATH.

Open the profile file.
```
vim /etc/profile
```

Add the content of the corresponding system to the profile file.

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

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

Press Esc, type :wq!, and press Enter to save the file and exit.

Make the environment variables take effect.
```
source /etc/profile
```

View the environment variables.

echo $JAVA_HOME
echo $JRE_HOME
echo $CLASSPATH
echo $PATH

CentOS:

openEuler:

View the Java version.
```
java -version
```
- CentOS:
- openEuler:

Parent topic: Configuring the Compilation Environment