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The Alt+Tab key sequence on Windows is the common power-user method of switching between application windows. I use this frequently, especially when running with an IDE like NetBeans; you run the application from within the IDE and Alt+tab back and forth to check what the app is doing compared to what the code is telling it to do. Alt+Tab basically works on Netbeans, but typically the "Alt" key modifier is left active in Netbeans. This means when you come back to NetBeans and try to do anything (like type some code) the IDE will interpret the keys you enter as Alt commands. (You can see that the Alt key is still active when the "File" menu is selected, even though you have not selected it; hitting "Alt" alone in the IDE will do this same selection). This is at the very least an annoyance, as the keys you enter go largely ignored until you realize the problem and hit Esc or click in the window to make the Alt state go away. But depending on what keys you type, you may get some very undesirable result when some Alt command occurs that you did not expect or want. Also, this is very non-native behavior; no other Windows native app has the problem of continuing to track the Alt key state even when that app is inactive.
Unfortunately this is known JDK bug, nothing we can do on Netbeans side. See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6458497 Appearance of this bug relates to the time and the way how Alt+Tab is pressed. When you press it slowly and first the Alt, then the Tab, release Tab, release Alt, error is more reproductible.
wontfix
*** Issue 91822 has been marked as a duplicate of this issue. ***
It isn't clear from the BugParade report when this issue began. Was it always there or is it something new to Java6?
I believe it was there for 1.4.x, the fixed in 1.5.0_02 and regressed again in 1.6. From bugparade it seems that issue is fixed again in 1.6.0 update 1.
*** Issue 92814 has been marked as a duplicate of this issue. ***
*** Issue 120242 has been marked as a duplicate of this issue. ***
*** Issue 122063 has been marked as a duplicate of this issue. ***
*** Issue 123592 has been marked as a duplicate of this issue. ***
*** Issue 124084 has been marked as a duplicate of this issue. ***
*** Issue 128269 has been marked as a duplicate of this issue. ***
*** Issue 133068 has been marked as a duplicate of this issue. ***
*** Issue 139983 has been marked as a duplicate of this issue. ***
*** Issue 144561 has been marked as a duplicate of this issue. ***
*** Issue 147532 has been marked as a duplicate of this issue. ***
*** Issue 147901 has been marked as a duplicate of this issue. ***
*** Issue 121605 has been marked as a duplicate of this issue. ***
*** Issue 151179 has been marked as a duplicate of this issue. ***
*** Issue 153142 has been marked as a duplicate of this issue. ***
Something strange with Bugzilla search, this bug was not appearing in search by queries 'alt tab', 'alt-tab' and 'alt+tab'.
*** Issue 157496 has been marked as a duplicate of this issue. ***
*** Bug 176606 has been marked as a duplicate of this bug. ***
*** Bug 212137 has been marked as a duplicate of this bug. ***