Windows' User Account Control (UAC) popped up like a judgmental parent. "Do you want to allow this app to make changes?"

The terminal output: Nebula Inventory System v1.0 — Ready.

######################################## 100%

Yes. The JRE was alive. But then he typed javac -version .

Alex opened a fresh Command Prompt. He typed java -version . The terminal replied:

He ran the program: java Main