[Possible bug] Can not start jruby-swing applications since 9.4.9.0 - or rather, the window auto-closes almost instantly #8416
Description
So, the following is a standalone hello-world example in jruby-swing:
#!/usr/bin/ruby -w
# Encoding: UTF-8
# frozen_string_literal: true
# ============================================================================ #
# === HelloWorldExample
# ============================================================================ #
java_import javax.swing.JFrame
java_import javax.swing.JLabel
java_import javax.swing.JPanel
java_import java.awt.Font
class HelloWorldExample < JFrame # === HelloWorldExample
alias e puts
# ========================================================================== #
# === initialize
# ========================================================================== #
def initialize
run
end
# ========================================================================== #
# === run
# ========================================================================== #
def run
frame = JFrame.new("HelloWorldExample")
frame.setDefaultCloseOperation(JFrame::EXIT_ON_CLOSE)
panel = JPanel.new
label = JLabel.new("Hello World")
panel.add(label)
frame.add(panel)
frame.pack
frame.setSize(1400, 1000)
frame.setVisible(true)
end
end
HelloWorldExample.new
I am using:
jruby 9.4.8.0 (3.1.4) 2024-07-02 4d41e55a67 OpenJDK 64-Bit Server VM 17.0.7+7-jvmci-22.3-b18 on 17.0.7+7-jvmci-22.3-b18 +jit [x86_64-linux]
It works fine.
When I switch to
jruby 9.4.9.0 (3.1.4) 2024-11-04 547c6b150e OpenJDK 64-Bit Server VM 17.0.7+7-jvmci-22.3-b18 on 17.0.7+7-jvmci-22.3-b18 [x86_64-linux]
though, a window shows up, but then immediately closes, without any
further notification as to why it closed. Nothing is printed on the
terminal after that window closes.
I have not investigated this further (for now I'll revert to 9.4.8.0,
which is mostly the same anyway) but I believe that no matter the
underlying reason, it should not instantly auto-close without any notice.
After all jruby 9.4.8.0 shows a different behaviour, and I can interact with
the window that is displayed, whereas on jruby 9.4.9.0 I can not do
anything since it auto-closes at once - all with the same code shown above.