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• How to handle all exceptions in a web java project

  - by Nick Donovan

  I am doing an web java project about an hotel reservation. I am using, sql, hibernate, java server pages. I want to know how can I redirect an incoming exception to an error.jsp file . There are a lot of java code , and a lot of jsp file. So I want to rederict every exception that I haven't handle to an error page, is there any way to do it ? An exception can come from everywhere and I can't know and handle them all ( for example an user can write to much data in an textfield, and it will generate me an sql exception for data to long) Thank you, sorry for my english.

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• Best practices for using Amazon SQS - Polling the queue

  - by alex

  I'm designing a service for sending out emails for our eCommerce site (order confirmations, alerts etc...) The plan is to have a "SendEmail" method, that generates a chunk of XML representing the email to be sent, and sticks it on an Amazon SQS queue. My web app(s) and other applications will use this to "send" emails. I then require a way of checking the queue, and physically sending out the email messages. (I know how I'm going to be dispatching emails) I'm curious as to what the best way to "poll" the queue would be? Should I create a windows service, and use something like Quartz.net to schedule it to check the queue every x number of minutes for example? Is there a better way of doing this?

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• Jsonp request using jquery to fetch bing web results

  - by Blankman

  using this as a guide: http://msdn.microsoft.com/en-us/library/dd250846.aspx can someone help me with the jquery call? Do I actually pass in the javascript code for the callback, or just the name of the function? BingSearch = function($bingUrl, $bingAppID, $keyword, $callBack) { $bingUrl = $bingUrl + "?JsonType=callback&JsonCallback=" + $callBack + "&Appid=" + $bingAppID + "&query=" + encodeURI($keyword) + "&sources=web"; $.ajax({ dataType: 'jsonp', jsonp: $callBack, url: $bingUrl, success: function(data) { alert('success'); $callBack(data); }, error: function(XMLHttpRequest, textStatus, errorThrown) { alert("error: " + textStatus); } }); };

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• Is using os.path.abspath to validate an untrusted filename's location secure?

  - by mcmt

  I don't think I'm missing anything. Then again I'm kind of a newbie. def GET(self, filename): name = urllib.unquote(filename) full = path.abspath(path.join(STATIC_PATH, filename)) #Make sure request is not tricksy and tries to get out of #the directory, e.g. filename = "../.ssh/id_rsa". GET OUTTA HERE assert full[:len(STATIC_PATH)] == STATIC_PATH, "bad path" return open(full).read() Edit: I realize this will return the wrong HTTP error code if the file doesn't exist (at least under web.py). I will fix this.

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• Stub web calls in Scala

  - by Dennis Laumen

  I'm currently writing a wrapper of the Spotify Metadata API to learn Scala. Everything's fine and dandy but I'd like to unit test the code. To properly do this I'll need to stub the Spotify API and get consistent return values (stuff like popularity of tracks changes very frequently). Does anybody know how to stub web calls in Scala, the JVM in general or by using some external tool I could hook up into my Maven setup? PS I'm basically looking for something like Ruby's FakeWeb... Thanks in advance!

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• Need help with video streaming with web-embedded Windows Media Player Component

  - by Ron

  Hello, I need to be able to play a .wmv video in a Windows Media Player component on a web page starting at a particular specified point in the video right away. I can embed the component and play the video. The problem is that even if I specify the location with The PARAM “currentPosition”, the video starts to play from the beginning. This appears to be because the requested position in the video has not been loaded yet. If I wait until the video has been loaded to the requested position and refresh the page, it will then play from the requested position. It seems that the video must start loading from the requested position in order to start right away. If this is the correct way, how would I go about doing it? If it is not, what is the proper way to do it? It can obviously be done, because YouTube’s players work like this. Thank you,

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• Automatic logout in python web app

  - by Ali

  I have a web application in python wherein the user submits their email and password. These values are compared to values stored in a mysql database. If successful, the script generates a session id, stores it next to the email in the database and sets a cookie with the session id, with allows the user to interact with other parts of the sight. When the user clicks logout, the script erases the session id from the database and deletes the cookie. The cookie expires after 5 hours. My concern is that if the user doesnt log out, and the cookie expires, the script will force him to login, but if he has copied the session id from before, it can still be validated. How do i automatically delete the session id from the mysql database after 5 hours?

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• How to decide which colors to use that look most similar across most screens/monitors?

  - by Lyon

  Hi, I'm baffled. I'm trying to find suitable colors for a logo that would look similar across most monitors/screens. I know it's near impossible, but how does one end up with the color palette that new Google logo and Facebook "blue" uses for example? I've a monitor that has been calibrated, and a few laptop screens that have default settings. Yet both the Google logo and facebook's look similar (although they aren't using colors restricted to the web safe 216 palette. Any ideas? thoughts? Thanks

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• continuous integration web service

  - by Josh Moore

  I am in a position where I could become a team leader of a team distributed over two countries. This team would be the tech. team for a start up company that we plan to bootstrap on limited funds. So I am trying to find out ways to minimize upfront expenses. Right now we are planning to use Java and will have a lot of junit tests. I am planing on using github for VCS and lighthouse for a bug tracker. In addition I want to add a continuous integration server but I do not know of any continuous integration servers that are offered as a web service. Does anybody know if there are continuous integration servers available in a software as a service model? P.S. if anybody knows were I can get these three services at one location that would be great to know to.

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• Deriving PathInfo class in web routes?

  - by drozzy

  I am reading the web-routes tutorial in Happstack, and I have no idea what this is doing: $(derivePathInfo ''Sitemap) class PathInfo a where toPathSegments :: a -> [String] fromPathSegments :: URLParser a The doc simply says: we use template-haskell to derive an instance of PathInfo for the Sitemap type. but where does it "store" it? I thought haskell had no state, and is PathInfo our own thing, or is it part of happstack? If someone could explain this, for dummies? Thanks.

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• Regular expression to validate name in .NET multilingual web application

  - by BT

  Hi, how can i write a regular expression to validate name field in a multilingual web application, i want to validate the name field for non-English languages e.g. Spanish or German, and we need to make sure that no one enter digits or special characters. I'm using .NET. I believe we can't use expression as below for non-English language. ^[a-zA-Z]{1,20}$ Any help will be highly appreciated! Solution: I'm using this regular expression ^\p{L}[\p{L}\p{Pd}\x27]*\p{L}$ , and the below MSISDN article was very helpful: MSDN - Regular Expression Also below tool is very helpful, in validating your regular expression: Regex Builder

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• Javascript function, on web page close

  - by AXheladini

  Hello there, I have an problem that i can not solve. The problem is this way: When i close my page on some browser i want an message box to appear and to ask me if I really want to close the page or not. logically: click on x (close tab on web browser) and than the box appears with two buttons yes and now, if i click yes the page will be closed if i click no the page will not close. I know there must be some javascript or ajax code but i can not configure it by my self.

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• What is the best way to store site configuration data?

  - by DaveDev

  I have a question about storing site configuration data. We have a platform for web applications. The idea is that different clients can have their data hosted and displayed on their own site which sits on top of this platform. Each site has a configuration which determines which panels relevant to the client appear on which pages. The system was originally designed to keep all the configuration data for each site in a database. When the site is loaded all the configuration data is loaded into a SiteConfiguration object, and the clients panels are generated based on the content of this object. This works, but I find it very difficult to work with to apply change requests or add new sites because there is so much data to sift through and it's difficult maintain a mental model of the site and its configuration. Recently I've been tasked with developing a subset of some of the sites to be generated as PDF documents for printing. I decided to take a different approach to how I would define the configuration in that instead of storing configuration data in the database, I wrote XML files to contain the data. I find it much easier to work with because instead of reading meaningless rows of data which are related to other meaningless rows of data, I have meaningful documents with semantic, readable information with the relationships defined by visually understandable element nesting. So now with these 2 approaches to storing site configuration data, I'd like to get the opinions of people more experienced in dealing with this issue on dealing with these two approaches. What is the best way of storing site configuration data? Is there a better way than the two ways I outlined here? note: StackOverflow is telling me the question appears to be subjective and is likely to be closed. I'm not trying to be subjective. I'd like to know how best to approach this issue next time and if people with industry experience on this could provide some input.

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• Amazon AWS S3 to Force Download Mp3 File instead of Stream It

  - by Calua

  Hi everybody, I'm using Amazon AWS S3 to put the mp3 file then allow our site visitor to download the mp3 from Amazon AWS. I use S3Fox to manage the file, everything seems working fine until recently we got many complaints from visitor that the mp3 was streamed via the browser instead of displaying browser save dialog. I try for some mp3 and notice that for some mp3, the save dialog box is appear, and for some others they're streamed via browser. What can I do to force that the Mp3 file will be downloaded instead of streamed via web browser.... Any help would be much appreciated. Thanks

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• Using gmail as SMTP server in Java web app is slow

  - by Annie

  Hi, I was wondering if anyone might be able to explain to me why it's taking nearly 30 seconds each time my Java web app sends an email using Gmail's SMTP server? See the following timestamps: 13/04/2010-22:24:27:281 DEBUG test.service.impl.SynchronousEmailService - Before sending mail. 13/04/2010-22:24:52:625 DEBUG test.service.impl.SynchronousEmailService - After sending mail. I'm using spring's JavaMailSender class with the following settings: email.host=smtp.gmail.com [email protected] email.password=mypassword email.port=465 mail.smtp.auth.required=true Note that the mail is getting sent and I'm receiving it fine, there's just this delay which is resulting in a slow experience for the application user. If you know how I can diagnose the problem myself that would be good too :)

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• Generating Dynamic web pages without server side scripting

  - by Microkernel

  Hi guys, I am trying to control a media device which has lot of multimedia content that it can play using another device(remote control device) like an ipad connected to the LAN. (UPnP) I want the media device to be able to send the content listing to the remote device so that it will be rendered as a webpage on the remote controller. And actions on the webpages needs to be sent to the the device as commands to execute (like play, pause, next etc). The media device is an embedded device, hence can't have any server side scripting, all has to be done on the client side. I want the page rendered to be HTML5. So, is it possible to generate dynamic HTML5 pages using just client side scripting? Thanks a lot. I am an embedded systems developer hence clueless about the web designing stuff.

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• Discussion on SEO best-practices for site development involving php...

  - by Bradley Herman

  Recently in our work, I've started getting some experience with SEO (finally). It's something I've put off for a long time because I've always maintained that SEO is a buzz-word b.s. pseudo-science and more about providing quality, relevant content (assuming proper header tags and the basics are covered). However, sometimes a client doesn't have stellar content yet still demands SEO and high rankings. While it's not how I design sites 100% of the time (as design dictates structure), I typically create a basic template from the design my boss gives me, then I optimize it, and then strip the top and bottom and move those to header.php and footer.php, using the following to bring in the header and footer based on AJAX versus HTML requests: <?php if($_SERVER['HTTP_X_REQUESTED_WITH']==''){ include('includes/header.php'); }?> #content here <?php if($_SERVER['HTTP_X_REQUESTED_WITH']==''){ include('includes/footer.php'); }?> Then, I use jQuery to intercept page requests and I use AJAX to fill in, for example, a #copy div with the new content. This avoids unnecessarily loading all the header and footer info everytime, but still allows users without Java to access pages without any problems. (also to think about, depending on size of content, do the extra http requests added using this method render it more of a server strain versus a single, larger file?) I don't have a really solid understanding of the meta keywords and their SEO significance, but as I recall reading, the keywords, title, and description on a page should match up to the pages content--ie. each page should have slightly different keywords/description while retaining some common ground. What I'm getting at here is trying to foster a discussion on whether my approach is flawed to begin with, if there are things I can do (within reason) that keep the site structure simple but allow for better SEO practices, or if my SEO understandings are wrong. This isn't a question, per say, but hopefully a constructive discussion here that more than just I can learn from. I appreciate any responses and hope to hear from you. Thanks!

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• Detecting regional settings (List Separator) from web

  - by Toms Mikoss

  After having the unpleasant surprise that Comma Seperated Value (CSV) files are not necessarily comma-separated, I'm trying to find out if there is any way to detect what the regional settings list separator value is on the client machine from http request. Scenario is as follows: A user can download some data in CSV format from web site (RoR, if it matters). That CSV file is generated on the fly, sent to the user, and most of the time double-clicked and opened in MS Excel on Windows machine at the destination. Now, if the user has ',' set as the list separator, the data is properly arranged in columns, but if any other separator (';' is widely used here) is set, it all just gets thrown into a single column. So, is there any way to detect what separator is used on the client machine, and generate the file accordingly? I have a sinking feeling that it is not, but I'd like to be sure before I pass the 'can't be done, sorry' line to the customer :)

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• Are there such things as Email Hooks?

  - by viatropos

  After hearing about git commit hooks, I was thinking maybe there are such things as email hooks... Is it possible for me to build a program that says "hey, you just received an email, now run this ruby script"? Something like a GMail Web Hook. Is there anything out there like that? I mean I could build a cron thing that checked my email all the time, but maybe there's a more formal way. Looking for an online email system to do this with, not say my Mac Mail.

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• Is a Service Bus a good option to communicate with multiple external servers?

  - by PFreitas

  We are developing an application that communicates, via web services or TCP/IP sockets, with multiple servers (up to 50 different external companies). Basically, the exchanged messages are the same (XML), but depending on the inputs of our application we should call 1 or more external servers. The benefits we would expect of introducing a Service Bus in the architecture would be: 1- Remove the need to manage all point-to-point configurations (all the 50 endpoints); 2- Simplify the communication layer of our application by having only one server to talk to; Is a Service Bus a good architectural option for this scenario? What is the best (simplest) Service Bus for this kind of communication? I read a few MSDN articles on Azure Service Bus Relay, but it didn’t seem to fit our needs. Am I wrong? Thanks for your help.

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• Auto-versioning of static content with JBoss

  - by Bears will eat you

  As per the Q&A here, I'd like to implement a similar auto-versioning system for a web app running in JBoss 5. Is there anything already out there to do this sort of thing, or will I need to write something myself? To be clear: I am not using PHP. Not knowing much about PHP, I'm not sure what the Tomcat/JBoss analogs of PHP's .htaccess, etc. are. If I do have to write my own auto-versioning, where would I start? The principle is clear to me - rewriting the URL using the file's timestamp, but I don't know much about URL rewriting with JBoss/Tomcat.

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• What is the best tool to achieve this API design?

  - by Jose Fernandez

  Our web app offers a service that allows a "Publisher" to create a website (we give them a CMS system) that is ready to provide this service to "Members" (think Shopify). We have some possible clients that wish to become "Publishers" but they already have existing websites (vbulletin, word press blog, etc) with their own user base. We wish to develop an API that would allow these "Publishers" to keep using their own websites, and embed our services into them. Our main business requirement is that once "Members" are logged into the "Publishers" existing system, they should be able to also access our website without having to log-in again OR have to create another account there. The process should be seamless to the "Member" and "Publishers" should not have to sync their user base with our system. We also want to use an existing API authentication/authorization system instead of creating our own (OAuth, OpenID, etc) What would be the best way to use OAuth to achieve this sigle-sign on design? If OAuth is not the best tool, is there any other one out there that fits our requirements?

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• Advice on embedding video content via CMS - what format?

  - by ted776

  Hi, if I set up the facility for people to embed video content on their site via their CMS (using TinyMCE editor), is there any reliable cross platform video format that should be used? From what I can find online, the only reliable way to embed and stream video is using FLV. Other formats seem to have caveats, e.g codecs required or quicktime updates required. Ideally I'd like to avoid this type of situation. If it is the case that FLV is the preferred option, then that involves asking people to encode their video content to FLV before uploading, so there is an extra step required here (unless I can set up the encoding in the back end, but this might take a while to process depending on the size of the video). Does anyone have any additional advice on this? The types of video i'd imagine people will be working with is raw camera footage, so i need to figure out the easiest and most reliable way of getting the footage on to a web page.

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• Create SOAP message from WSDL using axiom

  - by code-gijoe

  Hi, I'm a starting a project which consist in sending a request to a web-service (which is already available) and parsing the response. I have the WSDL and URL endpoints. Does anyone have a startup tutorial on how to build something from there? I would like to use Axis2 + Axiom to send the service request and receive and process the response. I'm using eclipse as dev env. I've been search for a tut on how to do this but with no success. Any suggestion would be greatly appreciated!

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• Combining a web application with another (larger).

  - by Kevin Brown

  I'm writing a web app, initially meant to be stand-alone--it's essentially a survey with user-management/authentication built on Codeigniter. The company I'm doing this for wants to merge it with their main system so that it acts like a feature, or a sub-app of their website. What is the best thing for me to do? I think I could do one of two things: Finish my application, as I had planned to initially, and let them handle the merging.It would probably save me a headache. Stop where I am in development, and migrate my authentication system to theirs, migrate the payment system to use theirs, and then finish the app. In your opinion, or experience, what is the best thing to do?

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