PSQLException: this ResultSet is closed

Question

i\'ve occours this strange error for the first time in my life, and i don\'t know what does it means. I\'ve a class that retrieve information from a table on a postgresql da

Answer 1

This is the problem:

stmt.close();
conn.close();

You're closing the connection to the database. You can't do that until you've read the data - otherwise how is the ResultSet going to read it? Maybe it will have read some data in to start with, but it's not meant to be a disconnected object.

In particular, from the docuemntation for ResultSet.close:

Note: A ResultSet object is automatically closed by the Statement object that generated it when that Statement object is closed, re-executed, or is used to retrieve the next result from a sequence of multiple results.