JDK-4401222 : JPopupMenu.setVisible(true) throws NullPointerException in headless mode
  • Type: Bug
  • Component: client-libs
  • Sub-Component: javax.swing
  • Affected Version: 1.4.0
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: linux,solaris_7,solaris_8
  • CPU: x86,sparc
  • Submitted: 2001-01-02
  • Updated: 2001-07-12
  • Resolved: 2001-06-22
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1.4.0 beta2Fixed
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With this code	javax.swing.JPopupMenu lw = new javax.swing.JPopupMenu();

I get the following:

  !!  FAIL: javax.swing.JPopupMenu: do_setVisible_2 status=fail with exception=java.lang.NullPointerException
        at javax.swing.JPopupMenu.getPopup(JPopupMenu.java:733)
        at javax.swing.JPopupMenu.setVisible(JPopupMenu.java:683)
        at javax_swing_JPopupMenu.do_setVisible_2(javax_swing_JPopupMenu.java:78)
        at javax_swing_JPopupMenu.run(javax_swing_JPopupMenu.java:3510)
        at java.lang.Thread.run(Thread.java:579)

Nowhere is Component.setVisible nor JPopupMenu.setVisible documented
to throw any exceptions.

Solaris 8 (sparc), JDK 1.4 build 46

--- begin - test.java-----

import javax.swing.JPopupMenu;

public class test {
	public static void main(String[] args) {
		JPopupMenu menu = new JPopupMenu();
--- end - test.java ----

Execute in headless mode:

% java -Djava.awt.headless=true test
mark.davidson@Eng 2001-01-19

CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: merlin-beta2 FIXED IN: merlin-beta2 INTEGRATED IN: merlin-beta2 VERIFIED IN: merlin-beta2

SUGGESTED FIX Name: pzR10082 Date: 05/17/2001 The solution could be just to add a check for null to the JPopupMenu.setVisible() method. Other Swing components seem not to have this problem: JPopupMenu just has a very special setVisible() method. *** /tmp/geta1237 Thu May 17 16:09:09 2001 --- JPopupMenu.java Thu May 17 15:41:27 2001 *************** *** 747,753 **** desiredLocationY); popupFactory.setPopupType(PopupFactory.LIGHT_WEIGHT_POPUP); ! newPopup.show(); return newPopup; } --- 747,755 ---- desiredLocationY); popupFactory.setPopupType(PopupFactory.LIGHT_WEIGHT_POPUP); ! if (newPopup != null) { ! newPopup.show(); ! } return newPopup; } ###@###.### 2001-05-17 ======================================================================

EVALUATION I'm able to reproduce this on 1.4.b48. mark.davidson@Eng 2001-01-19 As an initial fix, I've implemented checks for GraphicsEnvironment.isHeadless() in along the execution path. That only suceeds in pushing the encountered exception to other parts of the API (like in SwingUtilities.convertScreenLocationToParent()). The meta question to ask is: does it make sense to call JPopupMenu.setVisible(true) in a headless environment? If so then what should happen? mark.davidson@Eng 2001-03-19 Name: pzR10082 Date: 05/17/2001 It's hard to say what the submitted code is intended for, however, there should be no NPE thrown anyway. ###@###.### 2001-05-17 ======================================================================