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getting an error "Exception in thread "AWT-EventQueue-0" java.lang.NullPointerExcept"  RSS feed

 
abhijeet shrivastava
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Posts: 10
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Hi ranchers,

I am getting an error while executing a swing application.on the click of a button,I am capturing the inputs passed by an user and passing them to my another programme,but i am getting the following error

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException.

code for actionperformed method is as follows.

public void actionPerformed(ActionEvent e)
{
if ("submit".equals(e.getActionCommand()))
{
variables = new HashMap(); // declared the swing class.
variables.put("ServiceURL",url.getText());
variables.put("Value",ssn.getText());
variables.put("CallingAppRole",prtcpnt_id.getText());
variables.put("Life Event Code",life_evnt_cd.getText());
variables.put("Envoirnment",envoirnment.getSelectedItem());
WSTestHarness testHarness = new WSTestHarness();
testHarness.setgui_swing(variables);
testHarness.executeTestSession();
}
}





Thanks in advance.

Regards,
Abhijeet Shrivastava
 
Ilja Preuss
author
Sheriff
Posts: 14112
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Take a look at the full stack trace. It should tell you in which line the NPE occurs, which should make it rather obvious which variable is null.
 
It is sorta covered in the JavaRanch Style Guide.
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