System.out.print(">") not work

[quantrpeter]

Hi
System.out.print(">") not work, event i added System.out.flush(). The ">" never appear on screen. I am not sure Scanner::nextLine() affect it. Below is my code:

	private void run() {
		System.out.println("started");
		Scanner in = new Scanner(System.in);
		String command;
		System.out.print(">");
		while (!(command = in.nextLine()).equals("q")) {
		}
	}

thanks
Peter

[quantrpeter]

this is a stupid fix, but at least it works

[sruebner]

I'm having the same problem. I wanted to write an interactive command line program, but this is so annoying. Even if I manually flush System.out, it does not work until I send a newline character. When I build the project and execute it from the JAR-file, everything works as expected.

Would be nice to at least get some feedback.

[ShadowXBoss696]

Same problem here .... Even replaced System.out with AnsiConsole.out ( from Jansi )...
But nothing seems to work ...

Also, I have another problem i.e., after the System.out.print('>> ') call followed by System.console().readLine(), no typed charecters gets displayed until I press enter .... After that the typed charecters followed by printed string ( '>> ') gets printed to the display ....

Please provide some feedback ...

[YoungFrog]

I had the same problem. A workaround for me was to use an older version of maven (3.3.9).
I think this is https://issues.apache.org/jira/browse/MNG-6239
IIUC the fix is to use jansi 2.0.1 and apache/maven#401 is already merged, so we're only waiting for a release.

Anyway I don't think this is related to exec-maven-plugin at all

[quantrpeter]

@YoungFrog really sad

[Atrament666]

Same problem here, after some trials and errors I found that the problem seems to be in the 'exec:exec' goal because when using exec:java goal it works like a charm.

Simple example to test it on:

public static void main(String[] args) {
        System.out.print("Enter your name: ");
        Scanner sc = new Scanner(System.in);
        String name = sc.nextLine();
        System.out.println("Your name is: " + name);
}

When run on command line with exec:exec goal, the prompt 'Enter your name' doesn't show up, until you enter something and only then it appears together with the message 'Your name is ...' The output looks like this (my name is Atrament):

Atrament
Enter your name: Your name is: Atrament

When using the goal exec:java, the prompt shows up and the output looks like expected:

Enter your name: Atrament
Your name is: Atrament

[FlorianCassayre]

Very unfortunate, I was testing this plugin with some interactive bash scripts and the prompts simply don't show up:

read -p "Enter something: "

Prints a blank line.