[NETBEANS-4617] stdout not flushed to console until new line

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 12.0
• Fix Version/s: 12.2
• Component/s: projects - Gradle
• Labels: pull-request-available

Environment

Windows 10

• Assignee: Laszlo Kishalmi
• Reporter: Operaxis
• Created: 23/Jul/20 00:35
• Updated: 15/Feb/21 21:21
• Resolved: 10/Sep/20 00:09

Description

Similar (if not completely same) with: https://github.com/JetBrains/intellij-community/commit/707cf1427f66beb24faa5b8193217e52a8bb85d1 issue. In IntelliJ IDEA case, a fix has been published for version 2020.1. Can be used as reference.

Basically, printf() and print() does not work until a newline, not even System.out.flush() will work. This only happens on Gradle projects, and when running through the IDE (does not happen to Maven/Ant). This does not happen to println() because it prints new line.

Quite a breaking stuff, impossible to accept user input on the same line through the console.

As an example to demonstrate the issue:

public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        System.out.print("Please enter ABC: ");
        in.next();
        System.out.printf("DEF: ");
        in.next();
        System.out.println("GHI: ");
        in.next();
    }

Output:

JAVA_HOME="C:\Program Files\AdoptOpenJDK\jdk-14.0.1.7-hotspot"
cd C:\repo\test-cli; ./gradlew --configure-on-demand -PrunClassName=Transaction.Transaction -x check runSingle
Configuration on demand is an incubating feature.
> Task :compileJava UP-TO-DATE
> Task :processResources NO-SOURCE
> Task :classes UP-TO-DATE> Task :runSingle
ABC
DEF
Please enter ABC: DEF: GHI: 
GHI

BUILD SUCCESSFUL in 17s
2 actionable tasks: 1 executed, 1 up-to-date

A fix would be very appreciated, thank you.

 

Issue Links

• is related to: NETBEANS-4453 Output window doesn't display System.out.print lines until newline is sent.
• links to: GitHub Pull Request #2671
• mentioned in: Page Loading...