Question

I have written a Java program that should open another program (which is a .jar file). If I use this code in the main class of my program, all works correctly:

File logFile = new File("./ePaymentUpdater.jar");
Desktop.getDesktop().open(logFile.getCanonicalFile());
//or
Runtime.getRuntime().exec("java -jar ePaymentUpdater.jar");

But if I paste the same code in the event in response to the user clicking a button, it doesn’t work as it should:
The program seems to run, because it creates a folder like it should be (this code is in the main class of the called program), but it doesn’t show the jFrame it should

It seems that i cannot open a frame from inside the frame of another program…

This is my main class:

package prove_idiote;
import java.awt.Desktop;
import java.io.File;
import javax.swing.JOptionPane;

public class Main {

    public static void main(String[] args) {  

//        try {
//            Runtime.getRuntime().exec("java -jar ePaymentUpdater.jar");
//        } catch (Exception e) {            
//            System.out.println(e);
//        }

        Tester tester = new Tester();
        tester.setVisible(true);       
    }   
}

And this is my button event:

private void ExecuteActionPerformed(java.awt.event.ActionEvent evt) {                                         
    try {

        JOptionPane.showMessageDialog(null, "before" ,"ATTENZIONE!",JOptionPane.WARNING_MESSAGE);

        Runtime.getRuntime().exec("java -jar ePaymentUpdater.jar");

        JOptionPane.showMessageDialog(null, "after" ,"ATTENZIONE!",JOptionPane.WARNING_MESSAGE);

    } catch (Exception e) {            
        System.out.println(e);
    }
} 

Answer 1

I finally found the problem (and the solution)
There were some missing libraries in the called .jar (i’ve put the two jars in the same folder, so they shared the same libs, but one of them was using a lib that was missing)

Thnaks for the hints