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java.sql.SqlnonTransientConnectionException:Could not crete conection to database server.Attempted reconnect 3 times.Giving up

java.lang.nullpointerException

thanks for your reply
jar execu file in dist folder work fine
i used launch4j to create exe file from jar file it works fine but i install diffrant machine i get error " can't connect db...

hi!
i am new in java and i create simple application login form and from launch4j i make exe file it works fine but when i i install diffrent computer i get error can't connect db server
thanks