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I'm creating a dialog. In Netbeans I check the box always on top. I couldn't compile. (Netbeans is running under 1.5 my application is compiled with 1.4.2.) Then I got a lot of error messages. This checkbox create code that isn't compatible to older versions. Do I have to run Netbeans with 1.4? Or what is the solution for this problem?
If you need to run on 1.4.2 and know that setAlwaysOnTop is only in 1.5 then don't set it! ;) To be sure you can run NB on 1.4.2 - then you'll be offered with 1.4.2 properties only.
On our side, we could try to check the target platform of the project the form is placed in and possibly filter out specific known Swing properties that are not available on the target platform (supposing the IDE runs on newer version).
We will try to solve this issue in some future release.
The palette is already filtered according to the project platform - so component classes that are not available are not offered (even they are registered in palette content). For the rest we need to check the properties and constants used as property values or layout constraints. See also issue 99826. I can see two options how this could look like: either don't show the properties/values in property sheet at all, or show a warning when a non-existing property/value is used. The latter is easier to implement and less restrictive.