It seems that microba is not maintained any more: tdbear/microba@9a67c14. microba also recommends https://github.com/LGoodDatePicker/LGoodDatePicker for date switching (and also available on maven central (in contrast to microba)).

Since there seems to be an issue with the memory leak and microba (see #2166 (comment)), it seems that it is a good idea to switch to that library.

Alternative: Reimplement the tab in JavaFX. This could be significantly more effort than "just" replacing the library.