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  1. JDK
  2. JDK-8289573

[macos] Swing app fails when using -XstartOnFirstThread

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    • x86_64
    • os_x

      ADDITIONAL SYSTEM INFORMATION :
      OS X Monterey 12.4, 32 gig iMac i7, OpenJDK 18.0.1.1

      A DESCRIPTION OF THE PROBLEM :
      This seems to be a regression from bug #7128597. When building an app that uses AWT/Swing, if you use the -XstartOnFirstThread VM switch then it either locks or never shows a window. This fails either creating a Frame directly in a main or within an invokeLater.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Use this simple code (with or without the invokeLater, it doesn't make a difference, probably easier to check otherwise but I added this to test if that would be a fix):

      package com.mycompany.testproject;

      import java.awt.Dimension;
      import javax.swing.JFrame;
      import javax.swing.SwingUtilities;

      public class TestProject {

          public static void main(String[] args) {
              SwingUtilities.invokeLater(() -> {
              JFrame frame=new JFrame();
              frame.setMinimumSize(new Dimension(1000, 500));
              frame.setVisible(true);
              });
          }
      }

      Add VM option -XstartOnFirstThread


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      You should get a single frame.
      ACTUAL -
      Nothing happens. Removing the -XstartOnFirstThread gets you the expected results.

      ---------- BEGIN SOURCE ----------
      public class TestProject {

          public static void main(String[] args) {
              SwingUtilities.invokeLater(() -> {
              JFrame frame=new JFrame();
              frame.setMinimumSize(new Dimension(1000, 500));
              frame.setVisible(true);
              });
          }
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Removing -XstartOnFirstThread, but this isn't possible as libraries I'm using require it.

      FREQUENCY : always


            psadhukhan Prasanta Sadhukhan
            webbuggrp Webbug Group
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              Created:
              Updated:
              Resolved: