[MNG-6239] Jansi messes up System.err and System.out

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.5.0
• Fix Version/s: 3.8.2, 4.0.0-alpha-2, 4.0.0
• Component/s: Core
• Environment: Java 1.8.0_131, Ubuntu 17.04
• Assignee: Martin Kanters
• Reporter: Simone Bordet
• Created: 07/Jun/17 11:02
• Updated: 20/Oct/22 08:11
• Resolved: 30/Jun/21 18:55

Description

I use the Maven Exec Plugin to run a class that asks for interactive input from the user. This was working in 3.3.9, but does not work in 3.5.0.

Anything printed on System.err or System.out without a newline is not printed immediately on the terminal window.

Example:

BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
System.err.printf("listen port: ");
String value = console.readLine().trim();

The example above would not print listen port: on the terminal.

Attached you can find a project that reproduces this issue.
Unpack the project and then run:

$ mvn install && mvn exec:exec

The expected output of the reproducer would be:

err.println
out.println
err.printerr.printfout.printout.printf

instead I get:

err.println
out.println

Removing jansi-1.13.jar from $MAVEN/lib/ fixes the issue.

Issue Links

• depends upon: MNG-7079 Upgrade to jansi 2.2.0 and maven-shared-utils 3.3.4
• depends upon: MNG-7179 Upgrade Jansi to 2.3.3
• depends upon: MSHARED-962 Upgrade Jansi to 2.0.1
• is fixed by: MNG-7028 Upgrade Jansi to 2.+