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Express Throw Error

Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like express router error handling you, helping each other. Join them; it only takes a minute: Sign up Error handling VBA : when no errors? up vote 2 down vote favorite I'm trying to catch some errors with VBA, i found this

Express Error Object

tutorial and i wanted to catch the errors using the GoTo method like in the following example : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' myHandler: MsgBox "EROOR !" End Sub The problem is that even if there is no error, the myHandler section is always executed ! I found this discussion but the proposed answer doesn't solve the problem ! I tried to add an Exit Sub statement as express error handling best practices explained : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") Exit Sub ' ' Some Code ' myHandler: MsgBox "EROOR !" End Sub In that case it exits the method even without error. I also tried : Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' myHandler: MsgBox "EROOR !" Exit Sub End Sub But still the same problem, the myHandler is executed even without errors ! Can anyone help please ? excel vba error-handling share|improve this question asked Apr 13 '12 at 12:58 Mehdi 72241333 add a comment| 4 Answers 4 active oldest votes up vote 8 down vote accepted Just put Exit sub in. Sub mySub On Error GoTo myHandler: Workbooks.Open("myWorkbook") ' ' Some Code ' Exit sub myHandler: MsgBox "EROOR !" err.clear End Sub share|improve this answer answered Apr 13 '12 at 13:01 Fionnuala 77.1k665110 1 Can you add the line On Error Goto 0? So OP understands that it's a good practice resetting error redirects... Upvoted :) –Marco Apr 13 '12 at 13:02 @Marco Do you mean err.Clear? This is VBA. –Fionnuala Apr 13 '12 at 13:05 1 @Remou: maybe I'm wrong, but I remember I used (many years ago) On Error Goto 0 to make code behave without error checking. And I remember it was a good practice to use this instruction to

a long time now, I've been brute-force ugly with my error handling in my ExpressJS apps. Basically, just throw the exception after it bubbles back up to the route handler. This

Express Error Handling Example

works. If you don't mind the app completely blowing chunks at this

Express Error Handler Not Called

point and dumping itself entirely. Of course, you could put a global error handler in your code to node js error handling catch this unhandled exception, and *not* exit the app. But this is probably a bad idea, too. Once an exception is thrown (and not handled by the code that was http://stackoverflow.com/questions/10141292/error-handling-vba-when-no-errors being called, in the first place), the NodeJS environment is basically in an unknown and potentially bad state. Handle It Properly Unhandled exceptions should not be allowed to crash and exit the app. Therefore, you really want to handle this exception in your callback, properly. It's a simple change, but using "return next(err);" instead of "throw err;" allows asynchronous code to https://derickbailey.com/2014/09/06/proper-error-handling-in-expressjs-route-handlers/ raise an exception and still have it caught by the error handling pipeline in your app. Instead of putting the app into an unknown state where everything is potential dead or dangerous, calling "next(err)" tells the Express and Connect frameworks to pass the error along until an error handling middleware of function can properly take care of it. Error Handler Middleware If you weren't aware of it, every ExpressJS app comes with an error handler (or two - one for development work, one for non-development work… "production" … by default) in the default app.js file that is generated by the express command line: This code properly handles an error that was sent up the line using the "return next(err);" style of handling. Instead of putting the app in to an exception state by throwing the error, it is properly handled by the middleware, allowing you to write your own custom code, error logging and rendered view in response to the error ocurring. More On Error Handling There are potentially a lot more advantages to doing things this way, ce

Support Quickstart Video Playbooks Intro to Playbooks Playbook Roles and Include Statements Variables Jinja2 filters Jinja2 tests http://docs.ansible.com/playbooks_error_handling.html Conditionals Loops Blocks Strategies Best Practices Playbooks: Special Topics Become (Privilege Escalation) Accelerated Mode Asynchronous Actions and Polling Check Mode ("Dry Run") Playbook Debugger Delegation, Rolling Updates, and Local Actions Setting the Environment (and Working With Proxies) Error Handling In Playbooks Advanced Syntax express error Using Lookups Prompts Tags Vault Start and Step Directives Glossary About Modules Introduction Core Modules Extras Modules Common Return Values Internal use Module Index All Modules Cloud Modules Clustering Modules Commands Modules Database Modules Files Modules Identity Modules Inventory Modules Messaging Modules Monitoring Modules express error handling Network Modules Notification Modules Packaging Modules Remote Management Modules Source Control Modules Storage Modules System Modules Univention Modules Utilities Modules Web Infrastructure Modules Windows Modules Detailed Guides Amazon Web Services Guide Getting Started with Azure Rackspace Cloud Guide Google Cloud Platform Guide CloudStack Cloud Guide Using Vagrant and Ansible Continuous Delivery and Rolling Upgrades Getting Started with Docker Developer Information Ansible Developer Guide Ansible Tower Community Information & Contributing Ansible Users For Current and Prospective Developers Other Topics Community Code of Conduct Contributors License Agreement Ansible Galaxy The Website The ansible-galaxy command line tool Testing Strategies Integrating Testing With Ansible Playbooks The Right Level of Testing Check Mode As A Drift Test Modules That Are Useful for Testing Testing Lifecycle Integrating Testing With Rolling Updates Achieving Continuous Deployment Conclusion Frequent

 

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