I’d like to have some small popup messages appear under text fields to indicate if inputted information is incorrect like on Spring/Eclipse RCP. How can this be achieved?
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IMO there are at least two ways to achieve that. You can use JGlassPane or JXLayer framework. The basic idea to draw your popup messages on the transparent layer “above” your text fields.
I used the JXLayer framework because I felt it gave me a greater flexibility in what I could do.