jwm | Joe's Window Manager
kandi X-RAY | jwm Summary
kandi X-RAY | jwm Summary
JWM (Joe’s Window Manager).
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QUESTION
I have Exception:
...ANSWER
Answered 2019-Jul-14 at 14:26The exception is not thrown from a Spring controller, so it can't be caught by a ControllerAdvice
, which, as its name and its documentation indicates, advises controllers, not filters.
QUESTION
use std::io;
use std::fs::File;
use std::io::prelude::*;
fn main() {
let mut csv = File::open("Item.csv")?;
}
...ANSWER
Answered 2017-Sep-03 at 06:09What the error message is actually telling you is you're using the ?
operator inside of a function that returns ()
(this being the main
function). The ?
operator propagates errors upwards, but it can only do that if the function it's used in actually has a compatible return type that can represent that error.
Or in other words, you can only use it in a function that itself is returning a Result
(with a compatible error type). Your main
does not return a Result
, so you cannot use the ?
operator inside of it.
You may also be interested in RFC 1937, which would allow the use of ?
in main
(by allowing you to declare that main
returns a Result
).
QUESTION
The documentation tells us to load JDBC driver like so
...ANSWER
Answered 2017-Jan-07 at 09:38From official documentation:
The DriverManager methods getConnection and getDrivers have been enhanced to support the Java Standard Edition Service Provider mechanism. JDBC 4.0 Drivers must include the file META-INF/services/java.sql.Driver. This file contains the name of the JDBC drivers implementation of java.sql.Driver. For example, to load the my.sql.Driver class, the META-INF/services/java.sql.Driver file would contain the entry:
my.sql.Driver
Applications no longer need to explicitly load JDBC drivers using Class.forName(). Existing programs which currently load JDBC drivers using Class.forName() will continue to work without modification.
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