I’ll briefly make the case for migrating your code base to Java 11, then guide you through the steps to install Oracle JDK 11 using the Ubuntu command line.

JAVA_HOME vs PATH Variable Along with the configuration of JAVA_HOME, it is also useful to simultaneously update the operating system's PATH variable. With the PATH, the Java installation's \bin ...

If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.