PreparedStatement's .executeUpdate() method hangs, does not give an exception, or timeouts

Question

I'm using a PreparedStatement to Insert a row into my remote database. I'm getting an issue where after I finish preparing my PreparedStatement, and use its .executeUpdate() method, I do not get anything returned. No exception, value, or error of any sort. My database is working perfectly fine as I can still make queries to it.

I've logged statements in my code to see where the issue is:

as soon as I call int i = statement.executeUpdate(); I never get anything returned. The exception

catch (SQLException e) {
    System.out.println("Error: " + e);
    return null;
}

is also never called.

I have also tried using a timeout for the PreparedStatement of 10 seconds

statement.setQueryTimeout(10);

but unfortunately does not display any timeout errors. Any idea why this is happening?

---

String query = "INSERT INTO appointments(Title, Description, Location, Type, Start, End, " +
                "Created_By, Last_Updated_By, Customer_ID, User_ID, Contact_ID) " +
                "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);";
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            connection = DriverManager.getConnection(Constants.CONNECTION_URL);

            statement = connection.prepareStatement(query, Statement.RETURN_GENERATED_KEYS);

            System.out.println("Called here");
            //Have tried setting a timeout as well, but it doesn't do anything
            statement.setQueryTimeout(10);

            statement.setString(1, appointment.getTitle());
            statement.setString(2, appointment.getDescription());
            statement.setString(3, appointment.getLocation());
            statement.setString(4, appointment.getType());
            statement.setString(5, appointment.getStartDateAndTime());
            statement.setString(6, appointment.getEndDateAndTime());
            statement.setString(7, LoginManager.getUsername());
            statement.setString(8, LoginManager.getUsername());
            statement.setInt(9, appointment.getCustomer().getCustomerId());
            statement.setInt(10, LoginManager.getUserId());
            statement.setInt(11, appointment.getContact().getContactId());
            
            //This Println is never called for some reason.
            System.out.println("Called here two.");

            int i = statement.executeUpdate();
         
            //Never finishes beyond this point
            //Exception is never called
            System.out.println("ExecuteUpdate results: " + i);

            if (i > 0) {
                //success
                resultSet = statement.getGeneratedKeys();
                System.out.println("Success: " + resultSet.getInt(1));
                if (resultSet.next()) {
                    appointment.setAppointmentId(resultSet.getInt(1));
                }
                return appointment;
            } else {
                return null;
            }
        } catch (SQLException e) {
            System.out.println("Error: " + e);
            return null;
        } finally {
            closeConnection(connection, statement, resultSet);
        }
    }

public static void closeConnection(Connection connection, Statement statement, ResultSet resultSet) {
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (statement != null) {
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }