java - JOptionPane#showMessageDialog causes an application freeze -


i need show information message user , use following code purpose:

joptionpane.showmessagedialog(null, "message", "result", joptionpane.information_message);

but program loops or don't know on string of code. no matter insead of "message" still got app frozen. didn't done string of code changed ide eclipse , imports might have changed. checked , see import in class joption: import javax.swing.joptionpane;.

what may wrong or how check wrong?

try changing 

joptionpane.showmessagedialog(null, "message", "result", joptionpane.information_message);

to 

joptionpane.showmessagedialog(this, "message", "result", joptionpane.information_message);

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