install java runime edition jre or jdk on debian

install java runtime edition(jre) or java standart edition(java se) on debian

install java sdk or java runtime. Its so easy.

Java SE jdk.

1. Go to https://www.oracle.com/java/technologies/javase-downloads.html. And then download latest release LTE. For this time its 11.0.9. You need Oracle account for this. We download tar.gz archive with binaries. Why? Because this instruction will be work on all linux distributives.
2. Unarchive archive. For example to /src or /home/src 

tar zxvf jdk-11.0.9_linux-x64_bin.tar.gz

3. check java version:

java -version

For me its 🙂 :

bash: java: command not found

4. Create folder for jdk archive. I’m choose /opt/java

sudo mkdir -p /opt/java ; cd /opt/java

sudo mv /src/jdk-11.0.9 /opt/java

cd jdk-11.0.9

5. Install java development kit

sudo update-alternatives install /usr/bin/java java /opt/java/jdk-11.0.9/bin/java 100
sudo update-alternatives --config java

update-alternatives --install /usr/bin/jar jar /opt/java/jdk11.0.9/bin/jar 100
update-alternatives --config jar

update-alternatives --install /usr/bin/javac javac /opt/java/jdk11.0.9/bin/javac 100
update-alternatives --config javac

java -version
java version "11.0.9" 2020-10-20 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.9+7-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.9+7-LTS, mixed mode)

export JAVA_HOME=/opt/java/jdk11.0.9
export JRE_HOME=/opt/java/jdk11.0.9/jre
export PATH=$PATH:/opt/java/jdk11.0.9:/opt/java/jdk11.0.9/jre/bin

Install JRE

1. Download latest JRE version. Now its  1.8.0.271
2. move and unarchive

   tar zxvf jre-8u271-linux-x64.tar.gz
   mv /src/jre1.8.0_271 /opt/java

3. install java

sudo update-alternatives --install /usr/bin/java java /opt/java/jre1.8.0_271/bin/java 102
sudo update-alternatives --config java

sudo update-alternatives --install /usr/bin/javaws java /opt/java/jre1.8.0_271/bin/javaws 102
sudo update-alternatives --config javaws

4. check java – version

java -version
java version "1.8.0_271"
Java(TM) SE Runtime Environment (build 1.8.0_271-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.271-b09, mixed mode)