[jira] [Created] (MNG-6239) jansi messes up System.err and System.out

["Simone Bordet (JIRA)" <ji...@apache.org>]

Simone Bordet created MNG-6239:
----------------------------------

             Summary: jansi messes up System.err and System.out
                 Key: MNG-6239
                 URL: https://issues.apache.org/jira/browse/MNG-6239
             Project: Maven
          Issue Type: Bug
          Components: core
    Affects Versions: 3.5.0
         Environment: Java 1.8.0_131, Ubuntu 17.04
            Reporter: Simone Bordet
            Priority: Blocker
         Attachments: mvn-jansi.tgz

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:

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

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:

{noformat}
$ mvn install && mvn exec:exec
{noformat}

The expected output of the reproducer would be:

{noformat}
err.println
out.println
err.printerr.printfout.printout.printf
{noformat}

instead I get:

{noformat}
err.println
out.println
{noformat}

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



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