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.

If you get the “not recognized as an internal or external command” error, it’s possible that the command isn’t in one of the directories included in the PATH environment variable.

sbt new doesn't work on Windows: '"!_JAVACMD!"' is not recognized as an internal or external command #5188 ...