[Tips of the day] Compile, install and improve the java version that comes with the system

        Hello, everyone, it’s time for the daily tip again. Today I want to introduce to you how to upgrade the ava version that comes with the system using source code installation!

First, we need to check what version of Java comes with our system. How to check it?

java -version

As you can see, my system java version is 1.8.0_372d!

So assuming we want to upgrade to java17 version, how to achieve it?

First check where java is installed?

which  java

Secondly delete the storage location of java!

Method 1: The deletion is not clean, but it is recommended.

rm -rf  /ur/bin/java

Method 2: rpm -ql java Use rpm -e to uninstall java

Secondly, upload the source code package

rz jdk-17_linux-x64_bin.tar.gz

Unzip, move

ls view

Configure the /etc/profile file to let your system recognize this jdk

export JAVA_HOME=/usr/local/java
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar

It’s not the most complete one, but it’s simplified and can be used!

source /etc/profile

Finally, check the java version!

java -version