Can't hit breakpoints for user generated actions when debugging jython code with PyDev in Eclipse - eclipse

Question

I'm implementing a GUI application in Jython, using Eclipse and PyDev plugin.
The problem is that I have a hard time using the builtin debugger. When I start a debug session it just stops. Of course this should be expected as the program just creates a JFrame and then it's finished.
So any breakpoints I put for different events .e.g. pressing a button, will never happen as the debug session is already terminated.
What should I do ? I'm growing tired of using prints for all my debugging.
For instance, when I tried debugging this small Java example. I have no problem to hit
the breakpoint I had set in the windowClosing-method
import java.awt.event.*;
import javax.swing.*;
public class Test1 {
public static void main(String s[]) {
JFrame frame = new JFrame("JFrame Source Demo");
// Add a window listner for close button
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setVisible(true);
}
}
And then I tried this somewhat more or less similiar example in jython
from javax.swing import JFrame;
import java.awt.event.WindowListener as WindowListener
class Test1 (JFrame, WindowListener):
def __init__(self):
super(JFrame, self).__init__('Some name goes here', defaultCloseOperation = JFrame.EXIT_ON_CLOSE, size = (800, 800))
self.addWindowListener(self)
self.setVisible(True)
def windowClosing(self, windowEvent):
print 'window closing'
pass # want to hit this breakpoint
someFrame = Test1()
pass #breakpoint here maybe
If I tried to run the jython example in the debugger and it just terminates. Ok then I added a breakpoint after I created someFrame and a breakpoint in the windowClosing method. Still no luck, It doesn't get hit when I close the window but I see it executed as I see the printout.
Can anyone tell me what I'm doing wrong ? I'm sure I forgot something very simple.

Answer 1

Put a breakpoint in the first line of your main method that initiates the application.
If you want to debug certain actions like pressing a button add an action listener to a button and inside the handling method add the breakpoint. For example:
JButton button = new JButton("OK");
button.addActionListener(new ActionListener()
{
#Override
public void action(ActionEvent e)
{
System.out.println("button OK has been pressed"; // add breakpoint here
// call to some code that handles the event
}
});

Answer 2

I had the same problem
btnCompilar = new JButton("Compilar");
btnCompilar.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
compile(); //can't hit breakpoint here
}
});
I couldn't hit breakpoints inside actionPerformed, so I just made a method and used breakpoints in it.
void compile(){
//can hit breakpoint here
}