The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases.
This section discusses problems that you might encounter when using data transfer.
Problem: My drag gesture recognizer is not working properly with table/list/tree/text.
Do not use your own drag gesture recognizers with these components. Use setDragEnabled(true) and a TransferHandler.
Problem: I am unable to drop data onto my empty JTable.
You need to call setFillsViewportHeight(true) on the table. See
Empty Table Drop for more information.