JDK-6566905 : getFocusOwner() return Invisible component as focusowner
  • Type: Bug
  • Component: client-libs
  • Sub-Component: java.awt
  • Affected Version: 6
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: solaris_10
  • CPU: sparc
  • Submitted: 2007-06-07
  • Updated: 2011-05-18
  • Resolved: 2011-05-18
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JDK 7
7 b17Fixed
Related Reports
Relates :  
JDK-4726458 - Dialogs and Frames are never garbage collected
Description
I have a frame on which i have added some awt components. I have set one button to setFocusable(false), When i click the setFocusable(false)button the components on the frame gets removed one by one except setFocusable(false) button & a list & then later i am checking for the focus owner & focus window. 
On windows it gives Button1(first component) & next time when click the button i am getting frame as the focusowner & focus window. But on solaris , i am getting Button1 as the focus owner & next time when i click i am getting choice as the focus owner( second component ) & frame as focus window.  Where choice is removed. So the removed component can't be a focus owner. 

I tried an another scenario(Scenario #2) instead of removing all the components(see comment in actionperformed() ) , i just removed first two components & left last two components one focusable(list) & one nonfocusable component(button). But Still the problem can be seen. i,e i expect focus to be on list , but i can see the above described results.

I tried with an another scenario(Scenario #3), When the frame is visible , press tab so that second component may receieve the focus & when i press the nonfocusable button. the list receives the focus as expected.

Step to reproduce for Scenario1:
--------------------------------
1) Run the attached program.
2) Click on "Button2". Observe that components gets removed & see the console that "choice is the focus owner & its opposite component is "button1". If you see the same then the bug is reproduced.

Step to reproduce for Scenario2:
--------------------------------
Note:- Comment the line in actionPerformed line ( i have given the comment in the testcase).
1) Run the attached program.
2) Click on "Button2" . Observe that List dn't have focus. If you see the same then the bug is reproduced.

Step to reproduce for Scenario 3:
--------------------------------
Note:- Comment the line in actionPerformed line ( i have given the comment in the testcase).
1) Run the attached program.
2) Press "Tab" .  Now choice gain the focus.
2) Click on "Button2" . Observe that List have focus.  This is the correct behaviour.

I tested this in jdk1.5.0  to jdk 1.7.0.
Comments
EVALUATION Event after correcting the test we still may have the same problem and it has been fixed by the fix for 4726458.
25-06-2007
SUGGESTED FIX see 4726458
25-06-2007
EVALUATION the test itself also contain a problem. it checks current focus owner just after it was removed. But focus transfer is asynchonous thus you need to wait for events to check focus state. E.g. user can register property change listener on current keyboard focus manager.
07-06-2007
EVALUATION well, this is a known problem of our focus code, it allows non-visible componentn become a focus owner (if it was visible when requestFocus() was called). This is because the only place where we check visibility of possible focus owner is requestFocus() I think we have a number of bugs cause dby the same problem.
07-06-2007