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SOLVED, report query was like "Select customers.id AS customer_id, . . ." and the query in NetBeans project was "Select * FROM customers".
THANKS mate for the help!!!:cool:

I have already checked the db name and column names.When i finished the report design i saw it in preview and it was working fine and also exported a pdf with the data stored in database.


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Hello,
I have created a report using Jasper Report Designer BUT when i import it in my project i have an error "JRException unkown column name", i have checked the connection with the database and...