error-handling

问题 I have the following schema with required validations: var mongoose = require("mongoose"); var validator = require("validator"); var userSchema = new mongoose.Schema( { email: { type: String, required: [true, "Email is a required field"], trim: true, lowercase: true, unique: true, validate(value) { if (!validator.isEmail(value)) { throw new Error("Please enter a valid E-mail!"); } }, }, password: { type: String, required: [true, "Password is a required field"], validate(value) { if (

问题 I have a problem with my new bluetooth HC-05 module. In AT-mode it works perfectly with all commands that I need... exept INQ. I have tried to send whole bunch of other commands beforehand: AT+INIT OK AT+ORGL OK AT+ROLE=1 OK AT+CLASS=0 OK They all are working just fine. I tried to change IAC and INQM settings as well... but the answer from module is always the same: AT+INQ ERROR:(1F) I read related topic here and tried to push the button at HC-05, as it recommended there, but -- no result

问题 here is the fatal error: Fatal error: Constant expression contains invalid operations I get a fatal error in this code: <?php class InfoClass { private $user_agent = $_SERVER['HTTP_USER_AGENT']; // error is on this line public static function getOS() { global $user_agent; $os_platform = "Unknown OS Platform"; ... } i am using php 7. why is this error showing? thanks 回答1: Do This Instead <?php class InfoClass { private $user_agent; public function __construct(){ $this->user_agent = $_SERVER[

问题 I've seen 3 different ways of throwing an error in JavaScript: throw 'message'; throw Error('message'); throw new Error('message'); What is the difference between them? Note: I am aware of similar questions (1,2,3, etc). None of them cover all three cases. 回答1: throw is an expression which halts the function and generates an exception. Whatever directly follows throw is passed along in the exception. Think of it as a function with syntax sugar, so instead of writing throw('message') you write

问题 Let's say my node.js app is running. If there is an error (I mean ALL errors. Not just the web error. If it goes to Err out, it counts) , how can I call a function to send an email to me? Basically, before I want it to write to err.out, I want an email sent to me. I'm using node.js and express. Edit: I know how to send an email. The question I want to know is how to intercept the error . You know how when there's an error, it logs to out.log ? Well, right now, I'm tail -f out.log, monitoring

问题 Here's an example of using Tokio to run a function that returns a future: use futures::sync::oneshot; use futures::Future; use std::thread; use std::time::Duration; use tokio; #[derive(Debug)] struct MyError { error_code: i32, } impl From<oneshot::Canceled> for MyError { fn from(_: oneshot::Canceled) -> MyError { MyError { error_code: 1 } } } fn deferred_task() -> impl Future<Item = i32, Error = MyError> { let (sx, rx) = oneshot::channel(); thread::spawn(move || { thread::sleep(Duration::from

问题 I saw in some code that in OpenCL library, there is a class named cl::Error by which the error and type of error in OpenCL code can be catched. But when I added in my code, like this #include <CL/cl.hpp> #include <fstream> #include <iostream> #include <cassert> #include <exception> #define __CL_ENABLE_EXCEPTIONS int main() { std::vector<cl::Platform> platforms; cl::Platform::get(&platforms); assert(platforms.size() > 0); auto myPlatform = platforms.front(); std::cout << "Using platform: " <<

问题 I have a simple Spring MVC application in which I want to handle all the unmapped urls using @ControllerAdvice . Here is the controller: @ControllerAdvice public class ExceptionHandlerController { @ResponseStatus(HttpStatus.NOT_FOUND) @ExceptionHandler(NoHandlerFoundException.class) public String handle404() { return "exceptions/404page"; } } Still, every time get Whitelabel Error Page. I tried using RuntimeException.class , HttpStatus.BAD_REQUEST and extending the class with

问题 Im trying to catch any exception that is raised in any servicer so I can make sure that I only propagate known exceptions and not unexpected ones like ValueError, TypeError etc. I'd like to be able to catch any raised error, and format them or convert them to other errors to better control the info that is exposed. I don't want to have to enclose every servicer method with try/except. I've tried with an interceptor, but im not able to catch the errors there. Is there a way of specifying an

问题 When I specify 404 as a http result code, UseStatusCodePagesWithReExecute is working like expected. When I specify 403 as a http result code, UseStatusCodePagesWithReExecute is not working like expected. Somehow it works like I have specified UseStatusCodePagesWithRedirects . I need the behaviour of UseStatusCodePagesWithReExecute for all status codes in range of 400-600, including 403. The configuration code: public IServiceProvider ConfigureServices(IServiceCollection services) { //...