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• Tomcat startup logs - SEVERE: Error filterStart how to get a stack trace?

  - by Benju

  When I start Tomcat I get the following error: Jun 10, 2010 5:17:25 PM org.apache.catalina.core.StandardContext start SEVERE: Error filterStart Jun 10, 2010 5:17:25 PM org.apache.catalina.core.StandardContext start SEVERE: Context [/mywebapplication] startup failed due to previous errors It seems odd that the logs for Tomcat would not include a stack trace. Does somebody have a suggestion for how to increase the logging in Tomcat to get stack traces for errors like this?

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• How to install ported Linux software on a Mac? (MacPorts, Fink, anything better?)

  - by Ben Alpert

  On my Mac OS X machine, how would you recommend I install various software that's been ported from Linux? I don't install such software very frequently, but I've been using MacPorts and it always seems quite slow, presumably because it has to compile the packages on-the-fly. I'd much prefer a package management system that has binary packages, saving me the need to compile things every time I want to download something new. I think Fink has binaries for some of the packages, but I usually see MacPorts recommended as the system to use. Which do you think works better and why? (Or is there another system that I haven't heard of?)

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• What do I need to do to get IE8 to accept a self signed certificate?

  - by Jay

  We use self signed certificates on our intranet. What do I need to do to get IE8 to accept them without showing an error message to the user? What we did for IE7 apparently isn't working. EDIT: IE7 wouldn't show any errors if I put the certificate into trusted root certification authorities. IE8 seems to show errors even with the certificate there.

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• Would javascript and similar scripting languages benefit from being strongly typed?

  - by cwap

  Just had my mind going today. I spent some time in IE debug mode, browsing the web as usual, and oh boy do I see many errors :) Most of these errors are because some value are of a different type than expected (at least as far as I interpret the error messages). What are the reasons JavaScript and similar scripting languages aren't strongly typed? Is it just to make the languages "easier" to understand and more accessable, or is the lack of a "compile-time" the real problem?

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• Effective Data Validation

  - by John Conde

  What's an effective way to handle data validation, say, from a form submission? Originally I had a bunch of if statements that checked each value and collected invalid values in an array for later retrieval (and listing). // Store errors here $errors = array(); // Hypothetical check if a string is alphanumeric if (!preg_match('/^[a-z\d]+$/i', $fieldvalue)) { $errors[$fieldname] = 'Please only use letters and numbers for your street address'; } // etc... What I did next was create a class that handles various data validation scenarios and store the results in an internal array. After data validation was complete I would check to see if any errors occurred and handle accordingly: class Validation { private $errorList = array(); public function isAlphaNumeric($string, $field, $msg = '') { if (!preg_match('/^[a-z\d]+$/i', $string)) { $this->errorList[$field] = $msg; } } // more methods here public function creditCard($cardNumber, $field, $msg = '') { // Validate credit card number } // more methods here public function hasErrors() { return count($this->errorList); } } /* Client code */ $validate = new Validation(); $validate->isAlphaNumeric($fieldvalue1, $fieldname1, 'Please only use letters and numbers for your street address'); $validate->creditCard($fieldvalue2, $fieldname2, 'Please enter a valid credit card number'); if ($validate->hasErrors()) { // Handle as appropriate } Naturally it didn't take long before this class became bloated with the virtually unlimited types of data to be validated. What I'm doing now is using decorators to separate the different types of data into their own classes and call them only when needed leaving generic validations (i.e. isAlphaNumeric()) in the base class: class Validation { private $errorList = array(); public function isAlphaNumeric($string, $field, $msg = '') { if (!preg_match('/^[a-z\d]+$/i', $string)) { $this->errorList[$field] = $msg; } } // more generic methods here public function setError($field, $msg = '') { $this->errorList[$field] = $msg; } public function hasErrors() { return count($this->errorList); } } class ValidationCreditCard { protected $validate; public function __construct(Validation $validate) { $this->validate = $validate; } public function creditCard($cardNumber, $field, $msg = '') { // Do validation // ... // if there is an error $this->validate->setError($field, $msg); } // more methods here } /* Client code */ $validate = new Validation(); $validate->isAlphaNumeric($fieldvalue, $fieldname, 'Please only use letters and numbers for your street address'); $validateCC = new ValidationCreditCard($validate); $validateCC->creditCard($fieldvalue2, $fieldname2, 'Please enter a valid credit card number'); if ($validate->hasErrors()) { // Handle as appropriate } Am I on the right track? Or did I just complicate data validation more then I needed to?

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• What is the difference between these 2 XML LINQ Queries?

  - by Jon

  I have the 2 following LINQ queries and I haven't quite got my head around LINQ so what is the difference between the 2 approaches below? Is there a circumstance where one approach is better than another? ChequeDocument.Descendants("ERRORS").Where(x=>(string)x.Attribute("D") == "").Count(); (from x in ChequeDocument.Descendants("ERRORS") where (string)x.Attribute("D") == "" select x).Count())

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• PHP error handling : my code is not optimized

  - by Tristan

  Hello, I must warn you, this code will heart your eyes, so please don't judge me, i'm trying to improve the way I handle errors all my tests are like this : if ($something < 27) { $error_IP= '<div class="error_message">something bad</div> '; }else{ $erreur_IP=''; } and here's the ugliest thing : if( !isset($_POST) || ($erreur_captcha !='') || ($erreur_email !='') || ($erreur_hebergeurVide != '') || ($erreur_paysVide != '') || ($erreur_slotVide != '') || ($erreur_rconVide != '') || ($erreur_tick != '') + a lot more :d ) What do you suggest to me to optimize my errors handling ? Thank you

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• ASP.NET logging Events in DB

  - by Greens

  Hi , Was wondering if ASP.NET's System.web.Management can be used for logging events like userLogin, Passwordchanges,access to some resources or should we use the system.Web.Management for logging of errors and healthmonitoring Is there any way that I can do the logging of events without re-inventing the whole thing. I know ELMAH is used for Errors can it be used for logging events too?.

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• Set a ModelState to an ActionResult in ASP.Net MVC

  - by Marco

  Hi, In a View, I've created a <form> that posts some data to another Controller, which is different from that one that redirected me to the View. In this second controller, i perform some data validations and then, if errors are found, I need to redirect the user again to the source View but with the edited ModelState (so that i can show the validation errors). Any tips?

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• How to install software packages on a Mac? (MacPorts, Fink, anything better?)

  - by Ben Alpert

  On my Mac OS X machine, how would you recommend I install command line software and other packages? I've been using MacPorts and it always seems quite slow, presumably because it has to compile the packages on-the-fly. I'd much prefer a package management system that has binary packages, saving me the need to compile things every time I want to download something new. I think Fink has binaries for some of the packages, but I usually see MacPorts recommended as the system to use. Which do you think works better and why? (Or is there another system that I haven't heard of?)

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• How can I configure apigee to fail stale if the backend is unavialble?

  - by Anurag Kapur

  We have an API proxy configured with cache ttl of 2mins. Is it possible to configure apigee to serve stale cached content if the backend goes down so that our end users don't see errors? We would rather have our end users get copies of stale cached content (even after the configured ttl of 2mins expires) instead of errors when the backend goes down. Would appreciate if someone could point me to the relevant documentation if this is possible.

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• using ref to view error

  - by Avram

  Hello. I working now on firm that using ref in every function. The reason, is to catch errors. There example : //return true if the read is success //otherwise writing to the error ,the problem bool ReadFile(ref string error) Question: How do you catching errors? Using ref,exceptions or other way?

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• How to use ccache selectively?

  - by Anonymous

  I have to compile multiple versions of an app written in C++ and I think to use ccache for speeding up the process. ccache howtos have examples which suggest to create symlinks named gcc, g++ etc and make sure they appear in PATH before the original gcc binaries, so ccache is used instead. So far so good, but I'd like to use ccache only when compiling this particular app, not always. Of course, I can write a shell script that will try to create these symlinks every time I want to compile the app and will delete them when the app is compiled. But this looks like filesystem abuse to me. Are there better ways to use ccache selectively, not always? For compilation of a single source code file, I could just manually call ccache instead of gcc and be done, but I have to deal with a complex app that uses an automated build system for multiple source code files.

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• Is there a command to test an SQL query without executing it? ( MySQL or ANSI SQL )

  - by Petruza

  Is there anything like this: TEST DELETE FROM user WHERE somekey = 45; That can return any errors, for example that somekey doesn't exist, or some constraint violation or anything, and reporting how many rows would be affected, but not executing the query? I know you can easily turn any query in a select query that has no write or delete effect in any row, but that can lead to errors and it's not very practical if you want to test and debug many queries.

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• PHP difference between notice and warning

  - by Stegeman

  When writing code errors, warnings and notices can occur. I know the idea behind errors. I suppose a warning is there to inform you about something that can cause an error, but isn't a notice exaclty the same? I suppose a notice is not a message of something doing right ;). It's just a bit confusing to me. Can anybody tell the difference between those two and the way these messages should be treated.

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• how to insert PHP code snippet in javascript

  - by Piyush

  my code- <?php session_start(); $_SESSION['errors']="failed"; ?> <head> function myfunc() { alert(<?php echo $_SESSION['errors']; ?>); } </head> <body onload="myfunc();"> but alert msg is not popping up.

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• How to pipe the output of a command to file on Linux

  - by morpheous

  I am running a task on the CLI, which prompts me for a yes/no. After selecting a choice, a vast amount of info scrolls on the screen - including several errors. I want to pipe the output to a file so I can see the errors - but a simple '' is not working since the command expects a keyboar input. i am running on Ubuntu 9.1

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• Is there a way to add global error handler in a visual basic 6.0 application?

  - by ravi

  VB 6.0 does not have any global handler.To catch runtime errors,we need to add a handler in each method where we feel an error can occur.But, still some places might be left out.So,we end up getting runtime errors.Adding error handler in all the methods of an application,the only way?

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• I'm writing a game and would like a console, is it possible to dump javascript's console to a div in

  - by RobertWHurst

  I'm writing a game an I've got a console for developers to interact with javascript methods in the game. I have a problem though, I can figure out how to drop javascript errors to the console. is there anyway to write errors to a div or HTML element?

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• Vagrant sahara plugin - multiple snapshots

  - by BazZy

  How I can make more than one snapshot when in sahara sandbox mode? Or, can I see list of all commits I've ever made and rollback to any? Why do I need all this? I just want to setup initial VM. After that I want to compile number of packages from sources, and this takes pretty long time. So right now I thinking of this order: Setup initial ubuntu 12.04 vagrant box Snapshot this state Compile sources, install system wide rbenv (it make compilation also) Snapshot second state Start all my infrastructure experiments Rollback to any of my previous states or commit third state

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• Exception handling with simplexmlrpcserver - python.

  - by silverado

  Hello, Is there any way to handle connection errors with simplexmlrpcserver module? I want to catch any errors within my xmlrpc server to handle them in my own way instead of printing the traceback to stdout.

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• 404 page response.redirect vs server.transfer

  - by Amier

  when handling 404 errors in ASP.NET is it ok to set 404 errors to redirect to a page that sends the 404 response code to the browser or should server.transfer be used so the 404 header can be sent to the browser while the url remains the same?

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• paperclip plugin not support for I18n

  - by user354413

  I've added I18n support for error messages: Now you can define translations for the errors messages in e.g. your YAML locale file: en: paperclip: errors: attachment: size: "Invalid file size" content_type: "Unsupported content type" presence: "Cant' be blank" when I use validates_attachemnt_zie :avatar how to get error message?

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• ASP.NET MVC model state as text

  - by David Moorhouse

  Is there an easy way to get a summary string of the errors that have been added to a controller's modelstate? I'm looking to return this in an Ajax method and want the validation errors etc to be returned to the client (i.e. the view does not exist for this method call). Or do I have to loop through the modelstate and look at each object and extract the error text manually?

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• Best Practice for upgrading PHP On Production Systems

  - by Demic

  We Have two load balanced web servers running php 5.3. I've been asked by our dev team to upgrade php to 5.4 because they need certain functionality it will bring. The main issue is that 5.3 is the latest thats been built into the distros repository, so to upgrade using the package manager, Ill need to add another 3rd party repo. I dont have a problem with this per se, but Im concerned about using a package from a "non official" source. The other option is to compile php from source, but I guess this will prevent me from using the package manager to upgrade at any stage in the future? So I guess Im just looking for some guidance on which way to go. Compile from source or install from any old repo that purports to supply php 5.4? Or perhaps theres a third option I havent considered? Thanks in advance Demic

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