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• Can Java ServerSocket and Sockets using ObjectIOStreams lose packets?

  - by Joel Garboden

  I'm using a ServerSocket on my server and Sockets that use ObjectIOStreams to send serializable objects over the network connection. I'm developing an essentially more financial version of monopoly and thus packets being sent and confirmed as sent/received is required. Do I need to implement my own packet loss watcher or is that already taken care of with (Server)Sockets? I'm primarily asking about losing packets during network blips or whatnot, not full connection error. E.g. siblings move a lead plate between my router and computer's wi-fi adapter. http://code.google.com/p/inequity/source/browse/#svn/trunk/src/network Code can be found under network-ClientController and network-Server

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• 500 error for long url iis7

  - by Chris Porter

  I was getting 404 errors for some long URLs on a website I'm developing. After a bit of digging I discovered that this occurs when the length of certain aspects of the URL exceed configurable limits in IIS7. In this case the maxQueryString attribute of the requestLimits property needed to be increased in the web.config <system.webServer> <security> <requestFiltering> <requestLimits maxQueryString="4096" maxAllowedContentLength="4096" maxUrl="8192" > </requestLimits> </requestFiltering> </security> This fixed the problem instantly on my development server but on the remote server I now get: 500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed. And that's all the information it gives me.

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• Authenticating a Server with Digital Signatures

  - by TomS

  I understand how Non-repudiation and Integrity are achieved with Digital Signatures, but it's the Authentication that I don't grasp yet. I'm developing a Client-Server application in C#, that should be capable of Authentication with Digital Certificates and Digital Signatures. I know how to check the validity and integrity of a Signature (with SignedCms.CheckSignature()), but how does this authenticates any of the parts involved? For example: The client asks the Server for a Digital Signature, The client receives the signature and validates it, If the validation succeeds, continue. The client could be a victim of a man-in-the middle attack and receive a valid signature in step 2. The validation would succeed, but the client wouldn't be talking to the right server. What am I missing?

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• Techniques to avoid DeadlineExceededException in GAE/J?

  - by Tahir Akram

  I am developing an Twitter4J web application in Google App Engine/Java. I need to show two lists. One is Twitter friends and other is followers. With photo and screen name. It is working fine for people who have 20-30 followers and friends. But it gave me DeadlineExceededException when I try a user who has 150+ followers and friends. GAE throws this exception if web request take time more than 30 seconds. So what techniques I can adopt to avoid this exception. Should I generate two AJAX calls for each of my list. After page loads. So that every call will have its own 30 secs limit? Or what else you think? I am gone make it. Please help.

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• Access to module denied from within GAE dev server

  - by Tomas Kohl

  I am developing an app for GAE. Having installed the "feedparser" module with setuptools, I tried importing it (with "import feedparser") statement. However, the module does not load and when I look at the dev_appserver.py debug log on screen, I see the following: Access to module file denied: /usr/local/lib/python2.6/dist-packages/feedparser-4.1-py2.6.egg/feedparser.py So GAE dev server cannot access the module but I can't figure out why. The path is correct and the file is accessible. I am fairly new to Python/Django/GAE - what am I missing?

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• Jquery click behaviour

  - by VP

  I'm developing a menu. This menu, will change the background image when you click on a link, as almost all menus does. if i click in one link from the menu, this link backgroun will change the color. My jquery script is: $(function() { $('#menu ul li').click(function() { $('#menu ul li').removeClass("current_page_item"); $(this).addClass("current_page_item"); //return false; }); }); today, with the "return false" commented, when i click on the link under "#menu ul li" it changes the background open the new page and the background is reseted. For sure, if i uncomment the return false, the background works fine but then i cannot open any link. So its looks like after that i open a new page, it reset the classes. How can i make it persistent?

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• What design considerations should one take to receive text and multiple attachments via web?

  - by ramesh.nagul

  I am developing a web application to accept a bunch of text and attachments (1 or more) via email, web and other methods. I am planning to build a single interface, mostly a web service to accept this content. What design considerations should I make? I am building the app using ASP.NET MVC 2. Should the attachments be saved to disk or in the database? Should the unified single interface be a web service? Pros and cons to using web services to upload files

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• Custom Grails Environments?

  - by tinny

  I have been developing several Grails applications over the past couple of years. I am increasingly finding that the three grails environments (dev, test, prod) aren't enough to satisfy my needs. The more "enterprisey" your application gets, the more environments you tend to have. I tend to use 6 environments for my development cycle... DEVA //My dev DEVB //Team mates dev CI_TEST //CI like Hudson QA_TEST //Testing team environment UAT_TEST //Customers testing environment PROD //Production Im wondering if there is a way to define custom Grails environments? I dont think there is, but the feature could be handy. The way I am getting around this right now is by externalising the config to a properties file. Id imagine that this is a pretty common requirement, so how have you been dealing with your environments?

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• debug javascript in release mode with yui compressions

  - by mickyjtwin

  In our build scripts, we are using YUI compressor to minify/compress javascript and css files. As this combines the js into one file, it needs to be referenced in the Master Layout script, e.g. First question is what is best way to use both, so that if we are developing (in debug mode) it will reference each js file individually? Second question, is once on production, would there be any steps/solution to debugging the javascript on the production server, i.e. conditionallly load the javascript files based on setting a "debug=true" setting in either js or .net?

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• design time usercontrols - I can't see anything!

  - by taglius

  newbie question, please forgive... I'm developing a Wpf UserControl that will eventually be bound to a business object. The usercontrol is little more than a series of laid out TextBlocks, and perhaps (later) an image or two. As I'm laying out the usercontrol, I can put dummy text into all the TextBlocks so I can see what the usercontrol will look like, but as soon as I change the text property to contain the Binding information: <TextBlock Margin="0,12.8,42,0" Name="lblLastName" FontSize="8" Height="19" VerticalAlignment="Top" Text="{Binding Mode=OneWay, Path=LastName}"/> Then I can no longer see the textbox, or any "placeholder" text. This makes it very difficult to adjust the location and sizes of all the controls on the UserControl. In WinFormas programming, you could set binding information independently of the Text property, so you could at least see the Placeholder text during design time development. It's going to be pretty hard to visually arrange a bunch of invisible TextBlocks! What's the standard solution for this?

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• Saving generated .wav file to server with PHP

  - by bionicOnion

  I am developing a website where users can compose their own music, and the site will generate a .wav file for their creation. This is working correctly (inasmuch as I can play it on the page). However, I would like to save this file to the server to be listened to/downloaded at a later time, and the saved version of the file can no longer be opened and played by the HTML audio tag. What, if anything, must I put into the file besides the file besides the raw data? Instead of setting the src attribute of the audio tag to the location of the file, will I actually need to open it and generate a URI?

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• Google chrome extension: local storage

  - by Rohan

  Hi there I'm developing an extension for Google Chrome, and have run into some trouble.I created an options.html page and added it to the manifest.json file.The page shows properly. I saved the options, and then went back to the page on which the extension is supposed to run. Unfortunately, the Local storage for the options was returning a 'null' instead of the option. If I set the local storage option directly from the extension's JS script, it works fine but not if it was set from the options page. Any idea how i can access the options.html local storage values from my Javascript file in the extension? thanks!

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• ASP.NET MVC: Triggering an action before posting to Paypal payment gateway

  - by ajbeaven

  I'm in the middle of developing an e-commerce site that is using Paypal as it's payment gateway. All I want to do is run some code before the user heads off to Paypal to pay for their order, but I have no idea how to do it. The user should click a submit button, changes are made (in this case, the status of the order), and then the user is redirected to the payment gateway. Eg: [AcceptVerbs(HttpVerbs.Post)] public ActionResult GoToPaypal(FormCollection collection) { //change order status //send user to paypal where they pay for their order } So my question is how do you do application stuff and then redirect to paypal's payment gateway? Example HTML and C# would be lovely :)

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• Creating database desktop application with data manipulation in Netbeans using Java Persistence

  - by Lulu

  It's my first time to use Persistence in developing a Java program because I usually connect via JDBC. I read that for large amounts of data, it is best to use persistence. I tried playing with the CRUD example of Netbeans. It's not very helpful thought because it only connects to the DB and allows addition and deletion of records. I need something that will allow me to manipulate the data like if the value from column C1 of table T1 is such, it will retrieve data from table t2. In short, I need to apply conditions before knowing what to retrieve exactly. The example in CRUD example already has a specific table to retrieve and only acts like a database manager. How is it possible to retrieve a specific item first then from this, will determine the next steps to be done. I'm also using embedded JavaDB/Derby as my database (also my first time to use because I usually use remote mysql)

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• where to get a wordpress theme review

  - by Ayrton

  Hi I'm currently developing some Wordpress templates and I wanted to get a review by a (semi)professional. I already know quite a bit about Wordpress,CSS, & JS but I was always a lone wolf without any guidance that's why I was wondering where I could find someone (trustworthy) to do something like this and how much he should charge me. It's pure about the code (the PHP, JS & the CSS) I would like to have a review on about (nothing design related). A link to the Wordpress theme I'm talking about: http://demo.wpmonk.com/flowhub Yours truthfully ps: I know you can't give a review on the php on the clientside (however I could mail the source)

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• camera preview on androd - strange lines on 1.5 version of sdk

  - by Marko

  Hi all, I am developing the camera module for an android application. In main application when user clicks on 'take picture' button, new view with SurfaceView control is opened and camera preview is shown. When users click on dpad center, camera takes picture and save it to the disc. Pretty simple and straightforward. Everything works fine on my device - HTC Tattoo, minsdkversion 1.6 ...but when I tested application on HTC Hero minsdkversion 1.5, when camera preview is shown,some strange lines occur. Anyone has idea what is going on? p.s. altough preview is crashed, taking of pictures works fine here is the picture: Thanx Marko

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• AVD Screen orientation not changing with CTRL+F11 or CTRL+F12

  - by Brad Hein

  I run my app in the AVD emulator using eclipse but I'm unable to change the screen orientation in the AVD (Android 2.0 platform on the emulator). When I press CONTROL+F11 or CONTROL+F12 on the keyboard, nothing happens. No messages are generated in the adb debuglog/logcat either when I press either hotkey. According to http://developer.android.com/guide/developing/tools/emulator.html these are the correct hotkeys to switch the emulator's screen orientation. I tried it with my app, and with the messaging app. The hotkey has no affect in any case. I'm running Fedora 12, Gnome. I checked my Keyboard Shortcuts in the System - Preferences menu, nothing's attached to either hotkey. Same problem, 3 different PCs (all running Fedora Gnome).

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• Drupal / ubercart remote node addition

  - by combatwombat

  I am developing my first large Ubercart site, which needs to have a daily product database update from an existing xBase (DBF format). The conversion from DBF to MySQL/PHP is handled on the same server as the Drupal installation, using some custom scripting I have done, and works well. However, the next step is to get my script to talk to Drupal and update the product nodes with pricing/stock level/etc. Googling hasn't resulted in any good hits, at least in PHP terms. So how do I go about this? Can I just use a POST to a particular page in Drupal, ie RESTful, or do I have to use some more arcane xmlrpc method?

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• checking crc32 of a file

  - by agent154

  This is not really a "how to" question. Is there a "standard" file structure that applications use to store the checksums of files in a folder? I'm developing a tool to check various things like crc32, md5, sha1, sha256, etc... I'd like to have my program store the various hashes in files in the folder of what I'm checking. I know that there is a file commonly used called 'md5sums' or 'sha1sums'. But what about CRC? I haven't noticed any around. And if there is, what's the structure of it? Thanks.

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• iphone poll application to sync with myspace or facebook poll.

  - by Zach

  Hi, We are developing an iphone application, which requires us to add polling(survey) functionality in the app. We also have same poll in either MySpace or Facebook. We have to sync the polling data to our iphone application. How can we achieve this? We have found some third party polling service provider like Zoomerang, Poll Daddy polls, etc., but they don't have supporting API for iphone application or at least one we are not aware of. If anyone can shed light on this on how to proceed with this, it will be really very helpful. Thanks in advance. Zach.

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• Validate form fields from InfoPath custom code

  - by Alex Angas

  I'm developing an InfoPath form for Forms Services. It has these views: View 1 asks the user to input some basic initial data View 2 calls a web service based on data in View 1 and populates drop-downs accordingly At the bottom of View 1 I've added a Next > button to move to View 2. As part of clicking that button I would like the inputs in View 1 to be validated first. However, there don't appear to be any rules that validate a view or anything in the object model to execute validation rules. Is there code that can trigger a field's validation event?

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• How to debug a GWT application running on OSGi?

  - by Jaime Soriano

  I'm developing a web UI using GWT. While working only with the widgets I could debug from Eclipse using the Firefox extension, but now that I'm integrating the UI with other OSGi bundles I cannot use this solution. For deploying the GWT application I create the .war and convert it to an OSGi bundle using BND. Then I launch the OSGi container with all the bundles using Pax Runner and Pax Web and the application works correctly, but when something fails in the generated javascript code I don't have any decent output error or debugging facility. Is there any way to launch the GWT application in "debug mode" from OSGi? Any other idea that could help in this scenario?

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• Does MSDeploy support website and database upgrades?

  - by Samuel Jack

  I've just been reading about MSDeploy, the new website deployment tool from Microsoft. I'm developing an installer for a webapplication and a webservice to be used for our off-the-shelf product. I have a couple of questions that I couldn't find obvious answers to. Does MSDeploy have robust support for upgrading websites after the initial deployment? I can see MSDeploy has good support for the initial deployment of databases. But does it have support for upgrading schemas whilst preserving the current data? Links addressing these specific questions would be good.

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• Page Rendering occurs blank page because of Old Cookie

  - by user333177

  Hi! I am developing application using J2EE (JSF,RichFaces, Jetty/Glashfish). Sometimes when I click on some link I get nothing returned to the browser at all (blank page). But when i refresh the page all contents appears in page. After some trail and error i found that it is cookies problem: It happens bez some old cookie not deleted by browser so this problem occurs. We also change web.xml file: but it creates more problem it doesn't maintain the session in application. Please friends if you have any suggestion on this problem help us.

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• Can SqlAnywhere's UltraLiteJ DB tables be viewed in the Database Explorer of the Eclipse IDE

  - by Tobias

  Hi, I am developing a Blackberry app which should be able to access a DB. Here is my development environment and the tools I am using: Eclipse (Galileo) IDE with the Blackberry plugin installed. Blackberry OS 5.0 SQLAnywhere's DB 11 with UltraLiteJ (I am targeting Blackberrys running OS 4.1 and above) I have successfully executed a sample project for building a Blackberry application that uses the UltraLiteJ DB, following the tutorial in the UltraLiteJ documentation*. The tutorial creates, populates and retrieves data from the DB using java code. Now, I want to be able to access the tables and view data in them from the Eclipse IDE. Something similar to the FireFox plugin for SqlLite or say the Enterprise Manager for Sql Server 2005 which is a DB Explorer providing access to the StoredProcedures, Views, DB Diagrams etc. for a Database. Can someone please direct me as to how to tackle this problem? I hope the question is descriptive and clear. Much Obliged. *http://dcx.sybase.com/index.html#1101en/ulj_en11/uj-ch03.html

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