Linux finds and installs jdk, configures JAVA_HOME

Introduction:

        Find java in linux and configure JAVA_HOME

Table of contents

1. Find java:

Second, configure JAVA_HOME:

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1. Find java:

which java

 output:

/usr/bin/java

 find usr 

ls -lr /usr/bin/java

 output: 

/usr/bin/java -> /etc/alternatives/java

 find etc 

ls -lrt /etc/alternatives/java

 output: 

/etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.372.b07-1.el7_9.x86_64/jre/bin/java

installation manual:

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.372.b07-1.el7_9.x86_64

Second, configure JAVA_HOME:

1. Open the file that configures the environment variables:

vi /etc/profile

2. Add the following configuration:

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.372.b07-1.el7_9.x86_64
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

3. Esc - :wq save and exit

4. Refresh the configuration to take effect:

source  /etc/profile

5. Print address test

echo $JAVA_HOME