My midlet has just a TargetDetected method. what it does is:
wait for a tag
read ndef message
do some operation with this data also using data from phone recordstore
write back the updated data...

Thanks Michael for your clear answer.

Hi, I've been able to realize autolaunch by static registration in the Jad file.
I know that for autolaunching and reading the data of the ndef formatted tag, I need to implements NdefRecordListener...