java - Swing GUI Builder Intellij IDEA -

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i can't seem run form on intellij gui builder 

exception in thread "main" java.awt.illegalcomponentstateexception: contentpane cannot set null.

i assume code initialize views auto generated. right have jpanel , somehow not auto-initialized thought it's visible on designer.

it's gradle project , i've chosen run generated main function.

what have working?

public class myform {      private jpanel jpanel;      public static void main(string[] args) {         jframe frame = new jframe("myform");         frame.setcontentpane(new myform().jpanel);         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.pack();         frame.setvisible(true);     } }

by default, intellij idea ui designer works generating bytecode, unfortunately not supported gradle builds. can change generate source code in settings | editor | gui designer.


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