🚀 go-pugleaf

At runtime (java.exe) , executing the line:

  jButton1.setIcon(new ImageIcon(srvReports.MarcoVis.class.getResource("exit.gif")));

this exception occurs:  

java.lang.NullPointerException
        at javax.swing.ImageIcon.<init>(ImageIcon.java:106)
        at srvReports.Frame1.jbInit(Frame1.java:143)
        at srvReports.Frame1.<init>(Frame1.java:40)
        at srvReports.SrvRpt.<init>(SrvRpt.java:21)
        at srvReports.Aplicacion.<init>(Aplicacion.java:8)
        at srvReports.Aplicacion.main(Aplicacion.java:16)

This image ("exit.gif") is already added to the project (srvReports), and it is distributed in the jar file.
"Exit.gif" is located in the project folder too.

I have another application that sets the image icon in the same way, but it doesn't fail.

What can I do to solve it?

    Carlos Bravo.