slackbuilds_ponce/development/jdk12

jdk12 (Java Platform Standard Edition Development Kit)

The Java Platform Standard Edition Development Kit (JDK) includes
both the runtime environment (Java virtual machine, the Java platform
classes and supporting files) and development tools (compilers,
debuggers, tool libraries and other tools).  The JDK is a development
environment for building applications, applets and components that
can be deployed with the Java Platform Standard Edition Runtime
Environment.

More details: https://developer.oracle.com/java/

WARNING: These older versions of the JRE and JDK are provided to help
developers debug issues in older systems. They are not updated with the
latest security patches and are not recommended for use in production.

This SlackBuild will repackage official Oracle JDK archive.  You must
accept the Oracle Technology Network License Agreement for Oracle Java
SE to download this software

https://www.oracle.com/java/technologies/javase/jdk12-archive-downloads.html

After installation you will need to log out from the system and log in
back for environment variables get updated.