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On UNIX many users has symbolic links to external machines. For example "ln -s /net/zzz/export/sample /export/local_folder/sample" command creates symbolic link to external "zzz" machine. In Eclipse or Nautilus I see small sign and I can differ folder and symbolic link. In NetBeans in Favorites tab all folders has same icon. P.S. "rm /export/local_folder/sample" command deletes symbolic link "rm -r /export/local_folder/sample" command deletes all files in "sample" folder on remote machine NetBeans uses second way, but I think I will delete local files only.
There is currently no API in FileSystems that would tell us a FileObject is just a symlink.
but this is not specific to favorites. IMHO should be fixed in DataSystems (applies also to the Files view).