Swing Components in Default Processing Window_py5

py5
18

While we’re on the subject of EDT for Swing components, do you have any insight as to why this doesn’t run? Silently fails; no error messages in Thonny. There is no py5.

import jpype
import jpype.imports

jpype.startJVM()
import java
import javax
from javax.swing import *

def buildWnd():
    print("Got to here.")
    frame = JFrame("Hello World Swing")
    print("Never gets to here.")
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
    frame.setBounds(100,100,400,400)
    frame.setVisible(True)
    print("Done.")
    
SwingUtilities.invokeLater(buildWnd)

Addendum:
I think it has to have two threads: a main one and EDT for Swing (but I still don’t see a window):

import jpype
import jpype.imports

jpype.startJVM()

import javax
from javax.swing import *

def buildWnd():
    print("buildWnd called.")
    
def setup():
    print("Got to here.")
    frame = javax.swing.JFrame("Swing Demo")
    frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE)
    frame.setBounds(100,100,400,400)
    frame.setVisible(True)
    print("frame =",frame)
    print("Done.")
    
    javax.swing.SwingUtilities.invokeLater(buildWnd)

if __name__ == '__main__':
    setup()

Console output:

Got to here.
buildWnd called.
frame = javax.swing.JFrame[frame0,100,100,400x400,layout=java.awt.BorderLayout,title=Swing Demo,resizable,normal,defaultCloseOperation=EXIT_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,28,400x372,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
Done.

New Console Output: EDT called later after indenting SwingUtilities call

Got to here.
frame = javax.swing.JFrame[frame0,100,100,400x400,layout=java.awt.BorderLayout,title=Swing Demo,resizable,normal,defaultCloseOperation=EXIT_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,28,400x372,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
Done.
>>> buildWnd called.

Addendum 2:
AppHelper is your friend. This runs on a Mac in Thonny editor. @GoToLoop Can you run this on your Windows system?

import jpype
import jpype.imports

jpype.startJVM()

import java
import javax
from javax.swing import *
from PyObjCTools import AppHelper

def buildWnd():
    print("buildWnd called.")
    print("frame in buildWnd =",frame)
    btn = javax.swing.JButton("Button")
    btn.setBounds(30,60,100,24)
    frame.add(btn)
    frame.setVisible(True)
    print("btn =",btn)
    print("EDT =",javax.swing.SwingUtilities.isEventDispatchThread())
    print("Done in buildWnd.")
    
def main():
    global frame

    frame = javax.swing.JFrame("Swing EDT")
    frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE)
    frame.setBounds(100,100,400,400)
    frame.setLayout(None)

    javax.swing.SwingUtilities.invokeLater(buildWnd)
    AppHelper.runEventLoop()

main()

Output:

helper
helper810×806 17.3 KB

Console output:

buildWnd called.
frame in buildWnd = 2024-06-05 21:42:40.868 Python[40240:1751568] WARNING: Secure coding is not enabled for restorable state! Enable secure coding by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState: and returning YES.
javax.swing.JFrame[frame0,100,100,400x400,invalid,hidden,layout=java.awt.BorderLayout,title=Swing EDT,resizable,normal,defaultCloseOperation=EXIT_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,0,0x0,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
btn = javax.swing.JButton[,30,60,100x24,alignmentX=0.0,alignmentY=0.5,border=com.apple.laf.AquaButtonBorder$Dynamic@457e5465,flags=288,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=0,left=2,bottom=0,right=2],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=Button,defaultCapable=true]
EDT = True
Done in buildWnd.