如何在 Debian 10 Buster 上安装 Oracle jdk 15

Question

I'm trying to install Oracle's JDK 15 on vanilla Debian Buster 10 headless server. I downloaded the Oracle's Linux x64 Debian Package, but the installation somehow fails without any apparent errors:

sudo dpkg -i ./jdk-15.0.2_linux-x64_bin.deb


(Reading database ... 59385 files and directories currently installed.)
Preparing to unpack ./jdk-15.0.2_linux-x64_bin.deb ...
Unpacking jdk-15.0.2 (15.0.2-1) over (15.0.2-1) ...
Setting up jdk-15.0.2 (15.0.2-1) ... 

it seems ok, but then:

java --version

gives me:

command not found

Answer 1

An easy way be adding java and javac to update-alternatives :

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-15.0.2/bin/java 100
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-15.0.2/bin/javac 100

Next you will be able to use java and javac commands.

If you have a multiples java , javac versions, use the following command to switch between them:

sudo update-alternatives --config java
sudo update-alternatives --config javac