Centralized Error And Exception Handling
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it better to throw Exceptions to centralized error handlers? up vote 3 down vote favorite I've got a decently complex little game going on in Java (solitaire, essentially like the Windows version), but I have yet to do very much error handling. Almost all of the methods across my classes will end up either getting called by an initial constructor (eventually main()), a paintComponent() method, http error codes or a mouse event. So, my question is, is it bad practice to just use "throws Exception" on all of my lower-level methods, and only do a try/catch at my top-level methods to catch ALL the errors at once? (e.g. 3 try/catches - one for the painting, one for mouse events, one for the main method). I realize this prevents me from easily dealing with errors on-the-spot, but I don't really plan on doing that anyways. My error handling is going to consist of writing to a log, telling the user, and killing the program. Keeping this in mind, is there anything bad with doing my error handling this way? java error-handling share|improve this question asked Apr 16 '12 at 18:04 user891876 133112 1 No. That seems like an okay way to handle errors. –Hassan Apr 16 '12 at 18:09 Related to stackoverflow.com/questions/5284699/… –fgb Apr 16 '12 at 19:13 add a comment| 5 Answers 5 active oldest votes up vote 1 down vote accepted It depends on how you want to approach the situation. If you just want to catch any possible exception and you don't mind about the handler code, you
production issues can ruin your dinner and weekend plans. They can even affect your reputation if not resolved quickly. Having a clear policy on how to manage exceptions will save you time diagnosing, reproducing, and correcting issues. Here are 6 tips to improve your exception handling. Download the Source Code Download Java exception tracker 1. Use a single, system-wide exception class Instead of creating separate classes for each exception type, create just one. http://stackoverflow.com/questions/10179266/java-error-handling-is-it-better-to-throw-exceptions-to-centralized-error-hand And make it extend RuntimeException. This will reduce your class count and remove the need to declare exceptions you aren't going to handle anyway. I know what you're thinking: How will I tell exceptions apart if they're all the same type? And how will I track type-specific properties? Read on! 2. Use enums for error https://northconcepts.com/blog/2013/01/18/6-tips-to-improve-your-exception-handling/ codes Most of us were trained to put the cause of an exception into its message. This is fine when reviewing log files (ugh), but it does have drawbacks: Messages can't be translated (unless you're Google). Messages can't be easily mapped to user-friendly text. Messages can't be inspected programmatically. Putting info in the message also leaves the wording up to each developer, which can lead to different phrases for the same failure. A better approach is to use enums to indicate the exception's type. Create one enum for each category of errors (payments, authentication, etc.). Make the enums implement an ErrorCode interface and reference it as a field in the exception. When throwing exceptions, simply pass in the appropriate enum. Java throw new SystemException(PaymentCode.CREDIT_CARD_EXPIRED); 1 throw new SystemException(PaymentCode.CREDIT_CARD_EXPIRED); Now when you need to test for a specific case, just compare the exception's code with the enum. Java } catch (SystemException e) { if (e.getErrorCode() == PaymentCode.CREDIT_CARD_EXPIRED) { ... } } 12345 } catch (SystemExcept
About Blog Sign In Free Trial Production Practices Joyent Node.js Production Practices Design Error Handling Design EventEmitter Streams Control Flow Coding Style Linting Logging Client Server Specific https://www.joyent.com/node-js/production/design/errors Software Error Handling Deploy Cluster Domains Deploying New Versions Service Management Dependency Management Debug Debugging Performance Issues Debug a Running Process (DTrace) Postmortem Postmortem Debugging with mdb Logging MDB Modules Share: Error Handling in Node.js Error handling is a pain, and it's easy to get by for a long time in Node.js without dealing with many error in errors correctly. But building robust Node.js apps requires dealing properly with errors, and it's not hard to learn how. If you're really impatient, skip down to the "Summary" section for a tl;dr. This document will answer several questions that programmers new to Node.js often ask: In functions that I write, when should I throw an error, error in exception and when should I emit it with a callback, event emitter, or something else? What should my functions assume about their arguments? Should I check that they're the correct types? Should I check more specific constraints, like that an argument is non-null, is non-negative, looks like an IP address, or the like? How should I deal with arguments that don't match what the function expects? Should I throw an exception or emit an error to the callback? How can I programmatically distinguish between different kinds of errors (e.g., a "Bad Request" error vs. a "Service Unavailable" error)? How can I provide enough detail with my errors so that callers can know what to do about them? How should I handle unexpected errors? Should I use try/catch, domains, or something else? This document is divided into several parts that build on one another: Background: what you're expected to know already. Operational errors vs. programmer errors: introduction to two fundamentally different kinds of errors Patterns for writing functions: general