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  • PostgreSQL 9.1 on Ubuntu Lucid fails to start - how to debug?

    - by Tom Fakes
    I'm using Vagrant with Chef Solo to setup a Lucid 64 box. I'm using a Chef recipe to install PostgreSQL 9.1 from Martin Pitt's backports. The install goes ok until the point where the database is started with /etc/init.d/postgresql start There's a log pause and the command fails. If I run pg_ctl manually, the database starts! The entire contents of my postgresql-9.1-main log file is: 2012-05-07 11:01:18 PDT LOG: database system was shut down at 2012-05-07 11:01:16 PDT 2012-05-07 11:01:18 PDT LOG: database system is ready to accept connections 2012-05-07 11:01:18 PDT LOG: autovacuum launcher started 2012-05-07 11:01:18 PDT LOG: incomplete startup packet 2012-05-07 11:01:26 PDT LOG: received fast shutdown request 2012-05-07 11:01:26 PDT LOG: aborting any active transactions 2012-05-07 11:01:26 PDT LOG: autovacuum launcher shutting down 2012-05-07 11:01:26 PDT LOG: shutting down 2012-05-07 11:01:26 PDT LOG: database system is shut down I've tried to change the postgresql config file to get more info into the logfile, but that hasn't worked at all. How do I debug this to find out what is failing so I can fix it?

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  • L'impression sous iOS via AirPrint dans Mac OS X et Windows, par Florent Morin

    L'impression sans fil via AirPrint est disponible depuis iOS 4.2. Pour le moment, il n'est possible d'imprimer officiellement que sur quelques imprimantes HP compatibles. Cependant, en suivant notre tutoriel, vous allez découvrir comment activer cette fonctionnalité sur Windows et sur Mac OS X. La suite est par ici : http://kaelisoft.developpez.com/tuto...-via-airprint/ Et vous, utilisez-vous AirPrint ? Qu'attendez-vous de cette nouvell...

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  • PowerShell a constant in a changing world

    - by Rob Addis
    I've been programming for about 20 years now some of my friends have been at it for over 30. I have read many, many manuals and yes it's not my favourite past time. So 10 years ago I made a promise to myself to try and only learn about products which have long life times. I immediately gave up programming GUIs and concentrated on back end development as I decided that these products (Oracle, MQ Series, SQL Server, BizTalk and later WCF, WF) have longer life times and smaller incremental changes than front end products.10 years ago I had no idea how good a decision that would turn out to be. There have been so many different Microsoft products for the front end in that time; multiple versions of Windows Forms, FrontPage, Html, Javascript, ASP.net, Silverlight, SharePoint, WPF and now hopefully a stayer Metro.I remember being at a Microsoft conference in 2006 when Martin Fowler told a crowd of developers (I'm paraphrasing) "If you don't like change then you're in the wrong business!". Well I've been in the business for 20 years and yes I'm a little resistant to change. I like my investment in reading manuals and getting certified to be time well spent!Over the last 2 years I have been writing A LOT of PowerShell script, I think there is a good chance this product will still be around and be used for new development in 10 years, learning it is a good investment.

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  • Sécurité des mobiles pros : BlackBerry met la concurrence KO d'après Trend Micro, Boeing sort son Android ultra-sécurisé

    Sécurité des mobiles professionnels : BlackBerry met la concurrence KO D'après Trend Micro, Boeing sort son Android ultra-sécurisé Quelles que soient les turbulences qu'il traverse, Research In Motion, le constructeur derrière BlackBerry, garde une réputation exceptionnelle dans la sécurité mobile. La semaine dernière, le canadien présentait par exemple une nouvelle fonctionnalité pour sa tablette PlayBook. Celle-ci intègre désormais des « caténaires », sorte d'espaces protégés inspirés des partitions disques, pour faire cohabiter sur un même appareil des contenus privés (non chiffrés et libres) et professionnels (chiffrés et gérer de manière centralisée par un administrateur).

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  • Compiler Mono sous Fedora, par Romain Puyfoulhoux

    Citation: Mono est une implémentation libre du framework .Net, disponible pour Linux, Windows et Mac OS X. Cet article explique comment compiler Mono ainsi que l'IDE MonoDevelop à partir des sources. Cette méthode est en effet bien souvent nécessaire si l'on veut installer la dernière version du framework ou de l'IDE. c'est par ici n'hésitez pas à laisser vos remarques et commentaires dans ce thread...

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  • Comment rechercher une valeur dans une table qui contient des paliers, par Claude Leloup

    Rechercher dans une table une valeur qui ne s'y trouve pas nécessairement et choisir selon les circonstances : la valeur immédiatement supérieure (ou éventuellement égale) ou la valeur immédiatement inférieure. Access offre plusieurs voies pour atteindre ce but. Dans ce tutoriel, nous utiliserons uniquement des fonctions intégrées sans recourir à du code VBA. Nous aborderons l'utilisation des fonctions intégrées au moyen de quelques exemples pour illustrer la recherche d'une date, d'une heure, d'un texte ou d'une valeur numérique dans une table.

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  • Microsoft Visual Studio 2010 avec MSDN est désormais disponible chez SOS developers

    Mise à jour du 29/04/10 Visual Studio 2010 et .NET 4 disponibles en français Documentation comprise Il y a deux semaines, Visual Studio 2010 sortait officiellement. Officiellement. Mais en anglais. Mais aujourd'hui les choses changent puisque le célèbre IDE de Microsoft (documentation comprise) est disponible dans plusieurs autres langues, dont le français. Plus d'informations sur Visual Studio 2010 et .NET 4 en français.

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  • In the Aggregate: How Will We Maintain Legacy Systems? [closed]

    - by Jim G.
    NEW YORK - With a blast that made skyscrapers tremble, an 83-year-old steam pipe sent a powerful message that the miles of tubes, wires and iron beneath New York and other U.S. cities are getting older and could become dangerously unstable. July 2007 Story About a Burst Steam Pipe in Manhattan We've heard about software rot and technical debt. And we've heard from the likes of: "Uncle Bob" Martin - Who warned us about "the consequences of making a mess". Michael C. Feathers - Who gave us guidance for 'Working Effectively With Legacy Code'. So certainly the software engineering community is aware of these issues. But I feel like our aggregate society does not appreciate how these issues can plague working systems and applications. As Steve McConnell notes: ...Unlike financial debt, technical debt is much less visible, and so people have an easier time ignoring it. If this is true, and I believe that it is, then I fear that governments and businesses may defer regular maintenance and fortification against hackers until it is too late. [Much like NYC and the steam pipes.] My Question: Is there a way that we can avoid the software equivalent of NYC and the steam pipes?

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  • Microsoft Visual Studio 2010 avec MSDN est désormais disponible chez STR (Ultra Plat Dell 13" Offert

    Mise à jour du 29/04/10 Visual Studio 2010 et .NET 4 disponibles en français Documentation comprise Il y a deux semaines, Visual Studio 2010 sortait officiellement. Officiellement. Mais en anglais. Mais aujourd'hui les choses changent puisque le célèbre IDE de Microsoft (documentation comprise) est disponible dans plusieurs autres langues, dont le français. Plus d'informations sur Visual Studio 2010 et .NET 4 en français.

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  • Is it possible to auto-arrange the active Unity launcher icons?

    - by tijybba
    I am using Ubuntu 12.04 x64 bit as default DE. I was guessing it is possible to Auto Arrange the Current-Active applications in Unity Launcher panel to align in Lastly-Opened or Firstly-Opened in ascending or descending order, irrespective of their locked positions in the Unity Launcher panel. Just to get rid of Scrolling down the launcher panel every time to search active application thereby depriving the need of Alt-Tab shortcut. I mean Alt-Tab alternative in more smarter way, though I also use Alt-Tab for the task Management purpose.

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  • Comment programmer le robot humanoïde Nao en .Net ? Extrait d'une session sur le sujet donnée aux TechDays 2011

    Comment programmer le robot humanoïde Nao en .Net ? Extrait d'une session sur le sujet donnée aux TechDays 2011 La semaine dernière, à l'occasion des TechDays et pour présenter son Developer Program, l'équipe d'Aldebaran Robotics a donné une conférence sur la manière de programmer son petit robot Nao via .Net, ce qui se révèle somme toute assez simple. Extrait, avec des actions basiques comme dire "Bonjour" ou tourner la tête :

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  • Új dimenzió middleware (Java) virtualizáció területén

    - by peter.nagy
    Korábban már írtam róla, de most megtörtént a hivatalos bejelentés. Tehát elérheto lesz a JRockit Virtual Edition ami várhatóan új mértéket teremt middleware területen. Továbbá megjelent a Virtual Assembly Builder mely a rohamosan terjedo virtualizációs környezetben használt konfiguráció menedzsmentjét támogatja hatékonyan. A termék elso nyilvános webcast-jára pedig itt tessék regisztrálni.

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  • Le bogue des nombres à virgule flottante refait surface en Java, il plonge le compilateur et les programmes dans des boucles infinies

    Le bogue des nombres à virgule flottante refait surface en Java Et plonge le compilateur et les programmes dans des boucles infinies Mise à jour du 08/02/2011 Quelque temps après sa correction sur PHP, le bogue étrange des nombres à virgule flottante refait surface sur un langage tout aussi populaire : Java. Ce bogue provoquait sur PHP avant sa correction le crash du système par le passage d'un simple paramètre dans l'URL, pour peu que le script convertisse en nombres ou utilise ces variables dans des opérations arithmétiques (pour plus de détails, lire ci-devant) Sur Java, un bogue similaire plon...

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  • Is committing/checking in code everyday a good practice?

    - by ArtB
    I've been reading Martin Fowler's note on Continuous Integration and he lists as a must "Everyone Commits To the Mainline Every Day". I do not like to commit code unless the section I'm working on is complete and that in practice I commit my code every three days: one day to investigate/reproduce the task and make some preliminary changes, a second day to complete the changes, and a third day to write the tests and clean it up^ for submission. I would not feel comfortable submitting the code sooner. Now, I pull changes from the repository and integrate them locally usually twice a day, but I do not commit that often unless I can carve out a smaller piece of work. Question: is committing everyday such a good practice that I should change my workflow to accomodate it, or it is not that advisable? Edit: I guess I should have clarified that I meant "commit" in the CVS meaning of it (aka "push") since that is likely what Fowler would have meant in 2006 when he wrote this. ^ The order is more arbitrary and depends on the task, my point was to illustrate the time span and activities, not the exact sequence.

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  • Exporting from the GAC

    - by TATWORTH
    Recently I had need to export from the GAC - here are some useful resources:http://gacassemblyexporter.codeplex.com/SourceControl/list/changesetshttp://blogs.msdn.com/b/johnwpowell/archive/2009/01/14/how-to-copy-an-assembly-from-the-gac.aspxThere is an alternative method at http://aspdotnetcodebook.blogspot.co.uk/2008/09/get-copy-of-dll-in-gac-or-add-reference.html that involves de-installing what is part of the operating system - I would recommend this as a method of last resort.

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  • Le Nokia Lumia 800, digne successeur du Nokia 3310 ? Le smartphone passe trois mois au fond d'un lac et fonctionne toujours

    Le Nokia Lumia 800, digne successeur du Nokia 3310 ? Le smartphone passe trois mois au fond d'un lac et fonctionne toujoursLe Nokia 3310, reconnu pour sa grande robustesse et résistance au choc (ce qui avait d'ailleurs fait son succès), peut céder son siège au Nokia Lumia 800.Le smartpohone sous Windows Phone vient de démontrer qu'il est quasiment indestructible, même après trois mois et demi au fond d'un lac.Premier né du partenariat entre Nokia et Microsoft, le Lumia 800 avait été lancé en novembre...

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  • WordPress - Emergency Access Without Admin Accounts

    In some cases, when you need to do something in a WordPress website, but all you have is only access to WordPress database and FTP, and you cannot get the admin password from the database because it's decrypted. All changes you have to make via some low level MySQL queries, it's hard and easy mistaken. Joost de Valk has written a script for emergency access to WordPress dashboard by changing admin password or creating new user.

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  • General List of Common Programming Errors

    - by javamonkey79
    As one journey's from apprentice to journeyman to master I've noticed that one accumulates a list of best practices for things they've been bitten by. Personally, I write most of my stuff in java & SQL so my list tends to be slated towards them. I've accumulated the following: When doing list removal, always reverse iterate Avoid adding items to a list you are currently iterating on Watch out for NullPointerExceptions Now, I know there are language specific "common errors" links out there like this one. And I'm also aware of the pragmatic programmer tips, Martin Fowler's "code smells". Does anyone know of any good lists out there of things like I've listed above (re: list removal, adding items, etc). My guess is that there are some good QA folks out there that can probably throw me a bone here. I'm not looking for things the compiler can catch - I'm looking for common things that cause bugs. In the event that there isn't a list out there already then I welcome posting your own findings here. Thanks in advance!

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  • Java EE 7 offrira un support étendu du PaaS, la plateforme confirme son virage vers le Cloud

    Java EE 7 offrira un support étendu du PaaS La plateforme confirme son virage vers le Cloud Mise à jour du 24/06/11, par Hinault Romaric On sait déjà que le prochain Java EE 7 sera très orienté Cloud. La technologie Java pour les applications d'entreprises, dont les spécifications traitent des sujets comme la persistance, le développement et le déploiement d'applications, sera adaptée pour supporter plusieurs modèles de Cloud. Selon les déclarations d'un employé d'Oracle, le prochain JAVA EE aura des capacités permettant une prise en charge du PaaS ((Platform-as-a-service), défini comme la couche intermédiaire en...

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  • Mixing JavaFX, HTML 5, and Bananas with the NetBeans Platform

    - by Geertjan
    The banana in the image below can be dragged. Whenever the banana is dropped, the current date is added to the viewer: What's interesting is that the banana, and the viewer that contains it, is defined in HTML 5, with the help of a JavaScript and CSS file. The HTML 5 file is embedded within the JavaFX browser, while the JavaFX browser is embedded within a NetBeans TopComponent class. The only really interesting thing is how drop events of the banana, which is defined within JavaScript, are communicated back into the Java class. Here's how, i.e., in the Java class, parse the HTML's DOM tree to locate the node of interest and then set a listener on it. (In this particular case, the event listener adds the current date to the InstanceContent which is in the Lookup.) Here's the crucial bit of code: WebView view = new WebView(); view.setMinSize(widthDouble, heightDouble); view.setPrefSize(widthDouble, heightDouble); final WebEngine webengine = view.getEngine(); URL url = getClass().getResource("home.html"); webengine.load(url.toExternalForm()); webengine.getLoadWorker().stateProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, State oldState, State newState) { if (newState == State.SUCCEEDED) { Document document = (Document) webengine.executeScript("document"); EventTarget banana = (EventTarget) document.getElementById("banana"); banana.addEventListener("click", new MyEventListener(), true); } } }); It seems very weird to me that I need to specify "click" as a string. I actually wanted the drop event, but couldn't figure out what the arbitrary string was for that. Which is exactly why strings suck in this context. Many thanks to Martin Kavuma from the Technical University of Eindhoven, who I met today and who inspired me to go down this interesting trail.

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  • How to get better at solving Dynamic programming problems

    - by newbie
    I recently came across this question: "You are given a boolean expression consisting of a string of the symbols 'true', 'false', 'and', 'or', and 'xor'. Count the number of ways to parenthesize the expression such that it will evaluate to true. For example, there is only 1 way to parenthesize 'true and false xor true' such that it evaluates to true." I knew it is a dynamic programming problem so i tried to come up with a solution on my own which is as follows. Suppose we have a expression as A.B.C.....D where '.' represents any of the operations and, or, xor and the capital letters represent true or false. Lets say the number of ways for this expression of size K to produce a true is N. when a new boolean value E is added to this expression there are 2 ways to parenthesize this new expression 1. ((A.B.C.....D).E) ie. with all possible parenthesizations of A.B.C.....D we add E at the end. 2. (A.B.C.(D.E)) ie. evaluate D.E first and then find the number of ways this expression of size K can produce true. suppose T[K] is the number of ways the expression with size K produces true then T[k]=val1+val2+val3 where val1,val2,val3 are calculated as follows. 1)when E is grouped with D. i)It does not change the value of D ii)it inverses the value of D in the first case val1=T[K]=N.( As this reduces to the initial A.B.C....D expression ). In the second case re-evaluate dp[K] with value of D reversed and that is val1. 2)when E is grouped with the whole expression. //val2 contains the number of 'true' E will produce with expressions which gave 'true' among all parenthesized instances of A.B.C.......D i) if true.E = true then val2 = N ii) if true.E = false then val2 = 0 //val3 contains the number of 'true' E will produce with expressions which gave 'false' among all parenthesized instances of A.B.C.......D iii) if false.E=true then val3=( 2^(K-2) - N ) = M ie. number of ways the expression with size K produces a false [ 2^(K-2) is the number of ways to parenthesize an expression of size K ]. iv) if false.E=false then val3 = 0 This is the basic idea i had in mind but when i checked for its solution http://people.csail.mit.edu/bdean/6.046/dp/dp_9.swf the approach there was completely different. Can someone tell me what am I doing wrong and how can i get better at solving DP so that I can come up with solutions like the one given above myself. Thanks in advance.

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