Question

I want to make a Java program that reads a Password from STDIN silently. I mean, without outputting any pressed chars to the terminal and keeping it hidden from commandline history and the operating system processlist ps.

Answer 1

The class java.io.Console may be useful:

System.console().readPassword();

This reads a sequence of chars from the console, without echoing anything.
Note that it only works when you launch your java application with a real console. Otherwise, System.console() returns null.