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  • Two Phase Commit with MongoDB

    - by mattcodes
    Heres what Im thinking. Do you see any issues with this workaround to emulate 2 phase commit when using something like MongoDB where each operation is atomic and there is no support for transactions outside of that? transaction_scope: read message from servicebus - UpdateCustomerAddress get customer aggregate from docdb, replay events where commited =1 call customer.updateAddress validates creates customer address updated event apply event event store as uncommitted events do optimistic concurrency update against docdb pushing uncommitted events (single op to ensure consistency) publish event to service bus update docdb set events just published to commited = 1 (again one 1 op - at least in mongodb) transaction_complete

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  • Create an NSManagedObject Without Saving?

    - by Josh Kahane
    I need to make an NSManagedObject without saving it, how can I do this? I have tried insetting one without a context but the app crashes. I have tried the following: GuestInfo *guest; guest = (GuestInfo *)[NSEntityDescription insertNewObjectForEntityForName:@"GuestInfo" inManagedObjectContext:nil]; This causes the crash with the following error message: 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'GuestInfo'' This causes the Hope you can help, thanks.

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  • Cannot evaluate expression error in ONE project for years

    - by pukipuki
    Just tired to see this error every time for years only in ONE project: "Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized" Almost every property or field displays this message. From vs2005+.net2.0 to vs2008+.net3.5 now. Does anybody know how to fix it?

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  • How can I configure WCF to use x509 certificates over the internet?

    - by Ben Laan
    I need to use an x509 certificate to get secure message level authentication from a rich client via the internet to a secure WCF Web Service. Specifically, I am looking for a working step-by-step guide to setup, configuration, coding, and deployment, including creating a 'dev' certificate, installing it, and obtaining a 'real' certificate for production.

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  • What is the most elegant way to implement a business rule relating to a child collection in LINQ?

    - by AaronSieb
    I have two tables in my database: Wiki WikiId ... WikiUser WikiUserId (PK) WikiId UserId IsOwner ... These tables have a one (Wiki) to Many (WikiUser) relationship. How would I implement the following business rule in my LINQ entity classes: "A Wiki must have exactly one owner?" I've tried updating the tables as follows: Wiki WikiId (PK) OwnerId (FK to WikiUser) ... WikiUser WikiUserId (PK) WikiId UserId ... This enforces the constraint, but if I remove the owner's WikiUser record from the Wiki's WikiUser collection, I recieve an ugly SqlException. This seems like it would be difficult to catch and handle in the UI. Is there a way to perform this check before the SqlException is generated? A better way to structure my database? A way to catch and translate the SqlException to something more useful? Edit: I would prefer to keep the validation rules within the LINQ entity classes if possible. Edit 2: Some more details about my specific situation. In my application, the user should be able to remove users from the Wiki. They should be able to remove any user, except the user who is currently flagged as the "owner" of the Wiki (a Wiki must have exactly one owner at all times). In my control logic, I'd like to use something like this: wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); And have any broken rules transferred to the UI layer. What I DON'T want to have to do is this: if(wikiUser.WikiUserId != wiki.OwnerId) { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } else { //Handle errors. } I also don't particularly want to move the code to my repository (because there is nothing to indicate not to use the native Remove functions), so I also DON'T want code like this: mRepository.RemoveWikiUser(wiki, wikiUser) mRepository.Save(); This WOULD be acceptable: try { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } catch(ValidationException ve) { //Display ve.Message } But this catches too many errors: try { wiki.WikiUsers.Remove(wikiUser); mRepository.Save(); } catch(SqlException se) { //Display se.Message } I would also PREFER NOT to explicitly call a business rule check (although it may become necessary): wiki.WIkiUsers.Remove(wikiUser); if(wiki.CheckRules()) { mRepository.Save(); } else { //Display broken rules }

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  • on facebook, how do i authenticate an application, using JavaScript?

    - by GilShalit
    I can only find samples using php or curl. I want to do something like https://graph.facebook.com/<app_id>/accounts/test-users? installed=true&permissions=read_stream and the response is: { "error": { "type": "OAuthException", "message": "An access token is required to request this resource." } } as well is should... so how do i get the access token in JavaScript (using the JavaScript SDK obviously). thanks!

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  • PHP utf encoding problem

    - by shyam
    How can I encode strings on UTF-16BE format in PHP? For "Demo Message!!!" the encoded string should be '00440065006D006F0020004D00650073007300610067006'. Also, I need to encode Arabic characters to this format.

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  • Connection for control user as defined in your configuration failed. xampp

    - by Zann
    when i tried to uninstall xampp and reinstall xampp.I received below error message when i go phpmyadmin Need help and guide to solve it .thanks Error MySQL said: Documentation 1045 - Access denied for user 'root'@'localhost' (using password: NO) Connection for controluser as defined in your configuration failed. phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server.

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  • Jython saying "No visible constructors for class"

    - by clutch
    I have a jython servlet as part of a large application running in tomcat5. I tested a few Spring Framework classes and create the objects in the Jython servlet. When I try to create objects of classes in the application I catch an Exception message "No visible constructors for class". These java classes do have a public constructor class, such as: public SchoolImpl() { } I create the object in python: from com.dc.sports.entity import SchoolImpl ... school = SchoolImpl() What am I doing wrong?

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  • Exception Handling in google app engine

    - by Rahul99
    i am raising exception using if UserId == '' and Password == '': raise Exception.MyException , "wrong userId or password" but i want print the error message on same page class MyException(Exception): def __init__(self,msg): Exception.__init__(self,msg)

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  • Sending email using Java, connecting to a gmail host hangs

    - by Tot
    I would like to send emails via Java code. I added in my library the following .JARs: log4j.jar, smtp.jar, mailapi.jar,ctivation.jar. And my Java class looks like this: import java.util.Properties; import javax.mail.*; import javax.mail.internet.*; public class SendEmail { public static void main(String [] args) { String to = "[email protected]"; String from = "[email protected]"; String host = "smtp.gmail.com"; Properties properties = System.getProperties(); properties.setProperty("mail.smtp.host", host); properties.setProperty("mail.smtp.starttls.enable", "true"); properties.setProperty("mail.smtp.auth", "true"); SmtpAuthenticator authentication = new SmtpAuthenticator(); javax.mail.Message msg = new MimeMessage(Session .getInstance(properties, authentication)); try { msg.setFrom(new InternetAddress(from)); msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to)); msg.setSubject("Subject"); msg.setText("Working fine..!"); System.out.println("fine1 !!"); Transport transport = Session.getDefaultInstance( properties , null).getTransport("smtp"); System.out.println("fine2 !!"); transport.connect("smtp.gmail.com" , 465 , "username", "password"); System.out.println("fine3 !!"); Transport.send(msg); System.out.println("fine!!"); } catch(Exception exc) { System.out.println(exc); } } } My SmtpAuthenticator class: import javax.mail.Authenticator; import javax.mail.PasswordAuthentication; public class SmtpAuthenticator extends Authenticator { public SmtpAuthenticator() { super(); } @Override public PasswordAuthentication getPasswordAuthentication() { String username = "user"; String password = "password"; if ((username != null) && (username.length() > 0) && (password != null) && (password.length() > 0)) { return new PasswordAuthentication(username, password); } return null; } } When i run my Java application class it prints: fine1 !! fine2 !! And it hangs. How can I get rid of this problem?

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  • Adding reference to Office library failing: type or namespace name Word not found

    - by Dave
    I'm trying to use the sample code here: I went to "Add Reference" dialog and added "Microsoft Word 12 library", but it doesn't appear in the Solution Explorer. I also added: using Microsoft.Office; I get the following error message when trying to declare a "Word" object. Error 1: The type or namespace name 'Word' could not be found (are you missing a using directive or an assembly reference?) Any suggestions on how to properly reference the Word library?

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  • What is Erlang's concurrency model actually ?

    - by arun_suresh
    I was reading a paper recently Why Events are Bad. The paper is a comparative study of Event based and thread based highly concurrent servers and finally concludes stating that Threads are better than events in that scenario. I find that I am not able to classify what sort of concurrency model erlang exposes. Erlang provides Light Weight Processes, but those processes are suspended most of the time until it has received some event/message of some sort. /Arun

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  • Is there anyone here familiar with this zend debugger error found in apache's error log?

    - by wamp
    [Zend Debugger] Cannot receive start command ... [Zend Debugger] Cannot send message I googled and found there are others also having this problem (here and this one on serverfault), but unluckily no fix yet. PHP 5.2.8 (cli) (built: Dec 8 2008 19:31:23) Copyright (c) 1997-2008 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies Is there an official fix for this yet?

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  • Facebook Like box and Like buttons return Error

    - by spartan
    I'm integrating FB social plugins - Like box and Like buttons (as iframes) - on a web page, but they don't work. When I click on Like in "Like box", I get "Error" text with link, which displays a message dialog "The page at https://www.facebook.com/provocateur.eu could not be reached.". JSON response is: for (;;);{"__ar":1,"payload":{"requires_login":false,"success":false,"already_connected":false,"is_admin":false,"show_error":true,"error_info":{"brief":"Website Inaccessible","full":"The page at https:\/\/www.facebook.com\/provocateur.eu could not be reached.","errorUri":"\/connect\/connect_to_node_error.php?title=Website+Inaccessible&body=The+page+at+https\u00253A\u00252F\u00252Fwww.facebook.com\u00252Fprovocateur.eu+could+not+be+reached.&hash=AQARp73z7huT0Eiu"}}} When I click on the Like button, the JSON response is: for (;;);{"__ar":1,"payload":{"requires_login":false,"success":false,"already_connected":false,"is_admin":false,"show_error":true,"error_info":{"brief":"An error occurred.","full":"There was an error liking the page. If you are the page owner, please try running your page through the linter on the Facebook devsite (https:\/\/developers.facebook.com\/tools\/lint\/) and fixing any errors.","errorUri":"\/connect\/connect_to_node_error.php?title=An+error+occurred.&body=There+was+an+error+liking+the+page.+If+you+are+the+page+owner\u00252C+please+try+running+your+page+through+the+linter+on+the+Facebook+devsite+\u002528https\u00253A\u00252F\u00252Fdevelopers.facebook.com\u00252Ftools\u00252Flint\u00252F\u002529+and+fixing+any+errors.&hash=AQAFI_8ieMUGPPxS"}}} This is the "Like box" iframe code: <iframe frameborder="0" scrolling="no" style="border:none; overflow:hidden; width:240px; height:70px;" src="//www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Fprovocateur.eu&width=240&height=70&colorscheme=dark&show_faces=false&border_color&stream=false&header=true&appId=283499041689204"></iframe> and this is the "Like button" iframe code: <iframe frameborder="0" scrolling="no" style="border:none; overflow:hidden; width:203px; height:21px;" src="//www.facebook.com/plugins/like.php?href&amp;send=false&amp;layout=button_count&amp;width=203&amp;show_faces=false&amp;action=like&amp;colorscheme=light&amp;font=arial&amp;height=21&amp;appId=283499041689204"></iframe> The behaviour is the same for admin and non-admin visitors and for any browser. I created application with the same name as FB page with appId 283499041689204. Web page is XHTML transitional valid, and it contains no errors according FB debugger/linter. Formely there was age restriction (17+), but I removed it and for the moment it is accessible for anyone (13+). URL of web page: http://provocateur.eu/ URL of FB page: in the first error message Any help appriciated. Thanks in advance.

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  • Messaging problems

    - by Luke
    I am creating a messaging system but the problem I face is that when users try and enter certain characters like ' into the message, the database doesnt want to allow it. Any idea what this is?

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  • MessageBroker.getMessageBroker(null) getting null pointer Exception

    - by Shital
    I am creating Dynamic Destinations MessageBroker broker = MessageBroker.getMessageBroker(null); MessageService service = (MessageService) broker.getService("message-service"); MessageDestination destination = (MessageDestination) service.createDestination("Group1"); if (service.isStarted()) { destination.start(); } But I am getting Null Pointer Exception MessageBroker broker = MessageBroker.getMessageBroker(null); Can Anyone Help Me

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  • Curl CONNECTION OPTIONS

    - by cinek1lol
    HI I'd like to know how to check out the speed of a file being uploaded in real time using the curl library in c++. This is what I have written: curl_easy_getinfo(curl,CURLINFO_SPEED_UPLOAD,&c); But the manual says that it shows average speed, but even this doesn't seem to work with me, because I can only see a 0. There is one more thing: How to set an upload limit that works, because if I write this: curl_easy_setopt(curl, CURLOPT_MAX_SEND_SPEED_LARGE, 100); I get an error 502 message plis help

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  • Auto generation of Web Service sample, help and documentation

    - by orjan
    We're using javax.jws.WebServices deployed in a Glassfish server, is there a way to auto generate documentation like the one ASMX services generates? ASMX services display methods in service ASMX services when running locally could be easily tested with a prebuilt form ASMX services provided a sample request and response XML message http://keithelder.net/blog/archive/2008/01/15/How-to-Get-Around-WCFs-Lack-of-a-Preview-Web.aspx In Glasshfish together with /test/TestApi?wsdl there's /test/TestApi?Tester but it doesn't work, I don't know if it can be used to provide similar features as above?

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  • Django: How can I protect against concurrent modification of data base entries

    - by Ber
    If there a way to protect against concurrent modifications of the same data base entry by two or more users? It would be acceptable to show an error message to the user performing the second commit/save operation, but data should not be silently overwritten. I think locking the entry is not an option, as a user might use the "Back" button or simply close his browser, leaving the lock for ever.

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