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• Cerification for Rails?

  - by Salil

  I have passed SCJP 1.5 for JAVA 3 years back it hepls me to clear BASICS of the JAVA and OOPS. I would like to know if there is any certification exam conducted for the Ruby or Ruby on Rails.providing url details will be more helpful.

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• Blank white desktop icons on new Windows 7 install

  - by SiegeX

  I just did a fresh install of Windows 7 professional on my father's Toshiba Satellite laptop and everything went smoothly except for the fact that certain desktop shortcuts appear as a blank white page. I've tried: going in and changing the icon to many different things reloading the icon cache by deleting the IconCache.db file uninstalling his Free AVG as he heard the virus scanner might be preventing it (it wasn't and he put it back.) The one thing these icons have in common is that they are shortcuts to some very old DOS executables. One of them is Word Star 2000 to give you an idea. Does anybody have any other suggestions besides what we've tried?

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• Nhibernate: One-To-Many mapping problem - Cannot cascade delete without inverse. Set NULL error

  - by KnaveT

  Hi, I have the current scenario whereby an Article has only 1 Outcome each. Each Article may or may not have an Outcome. In theory, this is a one-to-one mapping, but since NHibernate does not really support one-to-one, I used a One-To-Many to substitute. My Primary Key on the child table is actually the ArticleID (FK). So I have the following setup: Classes public class Article { public virtual Int32 ID { get;set;} private ICollection<ArticleOutcome> _Outcomes {get;set;} public virtual ArticleOutcome Outcome { get { if( this._Outcomes !=null && this._Outcomes.Count > 0 ) return this._Outcomes.First(); return null; } set { if( value == null ) { if( this._Outcomes !=null && this._Outcomes.Count > 0 ) this._Outcomes.Clear(); } else { if( this._Outcomes == null ) this._Outcomes = new HashSet<ArticleOutcome>(); else if ( this._Outcomes.Count >= 1 ) this._Outcomes.Clear(); this._Outcomes.Add( value ); } } } } public class ArticleOutcome { public virtual Int32 ID { get;set; } public virtual Article ParentArticle { get;set;} } Mappings public class ArticleMap : ClassMap<Article> { public ArticleMap() { this.Id( x=> x.ID ).GeneratedBy.Identity(); this.HasMany<ArticleOutcome>( Reveal.Property<Article>("_Outcomes") ) .AsSet().KeyColumn("ArticleID") .Cascade.AllDeleteOrphan() //Cascade.All() doesn't work too. .LazyLoad() .Fetch.Select(); } } public class ArticleOutcomeMap : ClassMap<ArticleOutcome> { public ArticleOutcomeMap(){ this.Id( x=> x.ID, "ArticleID").GeneratedBy.Foreign("ParentArticle"); this.HasOne( x=> x.ParentArticle ).Constrained (); //This do not work also. //this.References( x=> x.ParentArticle, "ArticleID" ).Not.Nullable(); } } Now my problem is this: It works when I do an insert/update of the Outcome. e.g. var article = new Article(); article.Outcome = new ArticleOutcome { xxx = "something" }; session.Save( article ); However, I encounter SQL errors when attempting to delete via the Article itself. var article = session.Get( 123 ); session.Delete( article ); //throws SQL error. The error is something to the like of Cannot insert NULL into ArticleID in ArticleOutcome table. The deletion works if I place Inverse() to the Article's HasMany() mapping, but insertion will fail. Does anyone have a solution for this? Or do I really have to add a surrogate key to the ArticleOutcome table?

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• CentOS only detecting 50% of ram

  - by Devator

  I have 16GB ram in my machine. Before, free -m outputted the normal 16 GB ram, however now (after a reboot) it only detects 8 GB ram. Is one ram module damaged? grep -i memory /var/log/dmesg outputs Memory: 15621184k/16017200k available (2535k kernel code, 387120k reserved, 1748k data, 196k init). (Which looks like 16 GB to me). Free -m outputs: total used free shared buffers cached Mem: 7484 7415 68 0 6104 524 -/+ buffers/cache: 786 6697 Swap: 2055 0 2054 Anything I might be missing? Thanks in advance.

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• Dell Latitude e6520 gaming capabilities?

  - by user1072185

  I am purchasing a very reduced Dell Latitude e6520 from a friend and was wondering what kinds of games I could play on it and what resolutions. I'm not buying it for gaming purposes, but I am curious. The specs are as follows: Intel® Core™ i7-2720QM (2.20GHz, 6M cache) with Turbo BoostTechnology 2.0 nVidia® NVS™ 4200M 512MB DDR3 Discrete Graphics for Quad Core upon further research, the CPU requires this graphic card. 4.0GB, DDR3-1333MHz SDRAM 500GB 7200rpm Hard Drive I may upgrade to 8GB memory, depending if I am bogged down, what do you guys think?

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• Which OAuth library do you find works best for Objective-C/iPhone?

  - by Brennan

  I have been looking to switch to OAuth for my Twitter integration code and now that there is a deadline in less than 7 weeks (see countdown link) it is even more important to make the jump to OAuth. I have been doing Basic Authentication which is extremely easy. Unfortunately OAuth does not appear to be something that I would whip together in a couple of hours. http://www.countdowntooauth.com/ So I am looking to use a library. I have put together the following list. MPOAuth MGTwitterEngine OAuthConsumer I see that MPOAuth has some great features with a good deal of testing code in place but there is one big problem. It does not work. The sample iPhone project that is supposed to authenticate with Twitter causes an error which others have identified and logged as a bug. http://code.google.com/p/mpoauthconnection/issues/detail?id=29 The last code change was March 11 and this bug was filed on March 30. It has been over a month and this critical bug has not been fixed yet. So I have moved on to MGTwitterEngine. I pulled down the source code and loaded it up in Xcode. Immediately I find that there are a few dependencies and the README file does not have a clear list of steps to fetch those dependencies and integrate them with the project so that it builds successfully. I see this as a sign that the project is not mature enough for prime time. I see also that the project references 2 libraries for JSON when one should be enough. One is TouchJSON which has worked well for me so I am again discouraged from relying on this project for my applications. I did find that MGTwitterEngine makes use of OAuthConsumer which is one of many OAuth projects hosted by an OAuth project on Google Code. http://code.google.com/p/oauth/ http://code.google.com/p/oauthconsumer/wiki/UsingOAuthConsumer It looks like OAuthConsumer is a good choice at first glance. It is hosted with other OAuth libraries and has some nice documentation with it. I pulled down the code and it builds without errors but it does have many warnings. And when I run the new Build and Analyze feature in Xcode 3.2 I see 50 analyzer results. Many are marked as potential memory leaks which would likely lead to instability in any app which uses this library. It seems there is no clear winner and I have to go with something before the big Twitter OAuth deadline. Any suggestions?

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• Multithreading improvements in .NET 4

  - by Artiom Chilaru

  I have heard that the .NET 4 team has added new classes in the framework that make working with threads better and easier. Basically the question is what are the new ways to run multithreaded tasks added in .NET 4 and what are they designed to be used for? UPD: Just to make it clear, I'm not looking for a single way of running parallel tasks in .NET 4, I want to find out which are the new ones added, and if possible what situation would each of them be best suited for..

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• VBScript Out of String space

  - by MalsiaPro

  I got the following code to capture information for files on a specified drive, I ran the script againts a 600 GB hard drive on one of our servers and after a while I get the error Out of String space; "Join". Line 34, Char 2 For this code, file script.vbs: Option Explicit Dim objFS, objFld Dim objArgs Dim strFolder, strDestFile, blnRecursiveSearch ''Dim strLines Dim strCsv ''Dim i '' i = 0 ' 'Get the commandline parameters ' Set objArgs = WScript.Arguments ' strFolder = objArgs(0) ' strDestFile = objArgs(1) ' blnRecursiveSearch = objArgs(2) '######################################## 'SPECIFY THE DRIVE YOU WANT TO SCAN BELOW '######################################## strFolder = "C:\" strDestFile = "C:\InformationOutput.csv" blnRecursiveSearch = True 'Create the FileSystemObject Set objFS=CreateObject("Scripting.FileSystemObject") 'Get the directory you are working in Set objFld = objFS.GetFolder(strFolder) 'Open the csv file Set strCsv = objFS.CreateTextFile(strDestFile, True) '' 'Write the csv file '' Set strCsv = objFS.CreateTextFile(strDestFile, True) strCsv.WriteLine "File Path,File Size,Date Created,Date Last Modified,Date Last Accessed" '' strCsv.Write Join(strLines, vbCrLf) 'Now get the file details GetFileDetails objFld, blnRecursiveSearch '' 'Close and cleanup objects '' strCsv.Close '' 'Write the csv file '' Set strCsv = objFS.CreateTextFile(strDestFile, True) '' For i = 0 to UBound(strLines) '' strCsv.WriteLine strLines(i) '' Next 'Close and cleanup objects strCsv.Close Set strCsv = Nothing Set objFld = Nothing Set strFolder = Nothing Set objArgs = Nothing '---------------------------SCAN SPECIFIED LOCATION------------------------------- Private Sub GetFileDetails(fold, blnRecursive) Dim fld, fil dim strLine(4) on error resume next If InStr(fold.Path, "System Volume Information") < 1 Then If blnRecursive Then 'Work through all the folders and subfolders For Each fld In fold.SubFolders GetFileDetails fld, True If err.number <> 0 then LogError err.Description & vbcrlf & "Folder - " & fold.Path err.Clear End If Next End If 'Now work on the files For Each fil in fold.Files strLine(0) = fil.Path strLine(1) = fil.Size strLine(2) = fil.DateCreated strLine(3) = fil.DateLastModified strLine(4) = fil.DateLastAccessed strCsv.WriteLine Join(strLine, ",") if err.number <> 0 then LogError err.Description & vbcrlf & "Folder - " & fold.Path & vbcrlf & "File - " & fil.Name err.Clear End If Next End If end sub Private sub LogError(strError) dim strErr 'Write the csv file Set strErr = objFS.CreateTextFile("C:\test\err.log", false) strErr.WriteLine strError strErr.Close Set strErr = nothing End Sub RunMe.cmd wscript.exe "C:\temp\script\script.vbs" How can I avoid getting this error? The server drives are quite a bit <???? and I would imagine that the CSV file would be at least 40 MB. Edit by Guffa: I commented out some lines in the code, using double ticks ('') so you can see where.

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• Vaadin and Spring MVC Integration

  - by dakull

  I'm thinking about the possibility of using Spring MVC with Vaadin Framework. Are there any documented ways of making them play nicely together ? Also is it a good idea to use them together ? relating to performance; I'm going to run the app on a dedicated server. To make my question a bit more clear, how can i return a modelandview from a Spring MVC Controller that wll render using Vaadin and can access all the model data.

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• iPhone Development: Use of MKReverseGeocoder

  - by Mustafa

  Does anyone know if MKReverseGeocoder can be used in commercial apps/paid apps? The Google Maps Terms of Service are not very clear on that (to me). http://code.google.com/apis/maps/iphone/terms.html

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• Incredibly high latency for Ubuntu guest on Hyper-V

  - by Mark Henderson

  I've got several Ubuntu 10.04 virtual machines running as Hyper-V guests on Windows Server 2008 R2 SP1 and they're all perfectly fine. Today I installed my first Ubuntu 11.10 virtual machine and I'm seeing rediculous pings: These servers are all connected via gigabit to a local LAN, with almost no network traffic at all1, with a legacy network adapter in Hyper-V. I'm a bit of an Ubuntu n00b so I don't really know where to go from here. Any ideas? free -m reports: total used free shared buffers cached Mem: 485 470 15 0 63 299 -/+ buffers/cache: 107 378 Swap: 507 20 487 This is within a few mb of our other Ubuntu servers that are on 10.04. I removed the Legacy NIC and installed a Synthetic one in Hyper-V and this did improve the numbers, in that they're around 10-30ms now, but I would still be expecting <1ms response times. 1As a comparison, I have another Ubuntu 10.04 guest on Hyper-V almost 1,000km away that has a ping of 33ms

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• How to determine a windows executables DLL dependencies programatically?

  - by Kelly

  Anybody know how to determine what DLL's a binary depends on using programmatic methods? To be clear, I am not trying to determine the DLL dependencies of the running exec, but of any arbitrary exec (that may be missing a required DLL). I'm looking for a solution to implement in a C/C++ application. This is something that needs to be done by my application at runtime and can't be done by a third party app (like depends). Thanks. -Kelly

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• NPOI License (opensource fear)

  - by nCdy

  I was noticed that using Open source is dangerous, because some Open Source could be allowed only for Open Source projects. So my project is "For sell" and I'm scared using it... Can someone tell me : Can I use NPOI in my commerce project ? And maybe someone can clear my fears of using open source libraries and open source at all... Thank you.

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• How do I use an internal SSD as a scratch disk for FCP X?

  - by andrewb

  I'm contemplating setting up my MacBook Air as a video editing machine. If I do this, I'll upgrade to a 256 GB SSD, and I should be able to keep around 100 GB or more free for video editing. The video files would of course be stored externally, but save purchasing some expensive Thunderbolt RAID device (which I suppose is gradually becoming more of an option), it will be slow for read/writes. How can I have a set up where I take advantage of my SSD's speed for a scratch disk/cache for FCP X, but still have the TB(s) of storage of externals? I don't want to have to be moving files constantly back and forth, this is about saving time not wasting it.

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• kvm memory changes via virsh not propagating to vm

  - by kevintmckay

  Hi I just started using kvm on rhel6 and after creating a vm I tried to increase the memory but the changes I amde in the xml file do not propogate to vm, even after bouncing vm and restarting libvert? [root@kvm01 qemu]# virsh dominfo dev-kvm01 Id: 2 Name: dev-kvm01 UUID: 9b2bf581-2807-3116-b176-60e9c0559943 OS Type: hvm State: running CPU(s): 2 CPU time: 1975.3s Max memory: 7864320 kB Used memory: 7864320 kB Persistent: yes Autostart: disable Security model: selinux Security DOI: 0 Security label: system_u:system_r:svirt_t:s0:c47,c760 (enforcing) [iknowmed@dev-kvm01 ~]$ free total used free shared buffers cached Mem: 3632284 3614508 17776 0 3980 3491676 -/+ buffers/cache: 118852 3513432 Swap: 5668856 0 5668856

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• Difference between skin and CSS in Flex

  - by shruti

  Hi, I am new in Flex. Was just wondering what is the difference between skin and CSS?? Why it is better to use skin over CSS in Flex. Could anybody please clear my doubt. Thanks!!!

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• ZFS SAS/SATA controller recommendations

  - by ewwhite

  I've been working with OpenSolaris and ZFS for 6 months, primarily on a Sun Fire x4540 and standard Dell and HP hardware. One downside to standard Perc and HP Smart Array controllers is that they do not have a true "passthrough" JBOD mode to present individual disks to ZFS. One can configure multiple RAID 0 arrays and get them working in ZFS, but it impacts hotswap capabilities (thus requiring a reboot upon disk failure/replacement). I'm curious as to what SAS/SATA controllers are recommended for home-brewed ZFS storage solutions. In addition, what effect does battery-backed write cache (BBWC) have in ZFS storage?

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• Apache gives empty reply

  - by Jorge Bernal

  It happens randomly, and only on moodle installations. Apache don't add a line in the logs when this happens, and I don't know where to look. koke@escher:~/Code/eboxhq/moodle[master]$ curl -I http://training.ebox-technologies.com/login/signup.php?course=WNA001 curl: (52) Empty reply from server koke@escher:~/Code/eboxhq/moodle[master]$ curl -I http://training.ebox-technologies.com/login/signup.php?course=WNA001 HTTP/1.1 200 OK The apache conf is quite straightforward and works perfectly in the other vhosts <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /srv/apache/training.ebox-technologies.com/htdocs ServerName training.eboxhq.com ErrorLog /var/log/apache2/training.ebox-technologies.com-error.log CustomLog /var/log/apache2/training.ebox-technologies.com-access.log combined <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$"> ExpiresActive On ExpiresDefault "access plus 1 week" Header add Cache-Control public </FilesMatch> </VirtualHost> Using apache 2.2.9 php 5.2.6 and moodle 1.9.5+ (Build: 20090722) Any ideas welcome :)

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• PHP Object as XML Document

  - by Sam McAfee

  What is the best way to take a given PHP object and serialize it as XML? I am looking at simple_xml and I have used it to parse XML into objects, but it isn't clear to me how it works the other way around.

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• Php application url

  - by Andrea Girardi

  Hi guys, I've a doubt. How can I configure my application to use www.mysite.com/myfolder instead of www.mysite.com/myfile.php? I need to a create a profile page for every user registered to my PHP application but it's not so clear how can I do that. I've seen it's possibile with page frame, but, if possible, I prefrer don't use it. Thanks for the suggestions! cheers, Andrea

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• Passing array by ref.

  - by atch

  Ref. to my last post and sellibitze's comment to that post on passing array by ref rather than by value, why is it that when I'm passing array by value compiler can deduce arguments but it won't do it if I pass it by value? @Paul So just to make it clear when I'm declaring fnc: void f(int a[]);//I'm passing a pointer but when I'm declaring: void f(int &a[]);//I'm passing a ref? Do I understand this correctly now?

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• Nominal Attributes in LibSVM

  - by Chris S

  When creating a libsvm training file, how do you differentiate between a nominal attribute verses a numeric attribute? I'm trying to encode certain nominal attributes as integers, but I want to ensure libsvm doesn't misinterpret them as numeric values. Unfortunately, libsvm's site seems to have very little documentation. Pentaho's docs seem to imply libsvm makes this distinction, but I'm still not clear how it's made.

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• PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

  - by Vlad

  We will be expanding the storage for a PostgreSQL server and one of the things we are considering is using SSDs (Intel 520 Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect improved performance, however we are concerned about longevity since our database usage pattern is quite write-heavy. We are also concerned about data corruption in case of power failure (due to SSDs write cache not flushing properly). We currently use RAID10 with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380 G6 server with P410 Smart Array Controller and BBWC. What makes more sense: upgrading the drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?

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• Setting up a Windows Server 2008 R2 DC + Fileserver : native or virtual?

  - by user126890

  I want to deploy a new DC + Fileserver using Windows Server 2008 R2 SP1 Standard Edition on a Dell PowerEdge R410 and iSCSI storage for a small business (~30 people). Should I install the system native on the server or use a virt layer? I don't have a budget for virtualization so i gotta go with something free... What's a better working routine, taking snapshots of vm's or taking backups (Acronis/CloneZilla) of systems? If I use a virt system, I need a GUI for some people in the business to reset the system to a earlier state in emergency situations. I wanted to install phpVirtualBox once but never finished, is it suitable in a productive environment? server specs: Intel Xeon E5620 CPU (2,40GHz, 4C, 12MB Cache) 8GB RAM Dual Rank LV RDIMMs 1333MHz 2x 1TB SATA 7,2K 3,5, RAID1

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• Issue varnish purge through CloudFlare to Varnish

  - by Michael

  I've been working on this for a while and can't seem to find any solution. I have varnish sitting in front of my nginx server, with CloudFlare sitting in front. When I issue a curl -X PURGE host CloudFlare picks it up and of course denies it with a 503 error. If I use direct.host to bypass CloudFlare it hits the Varnish server and it accepts the request but it does nothing since direct.host isn't used so there is nothing in the cache for that url. I am using WordPress and there is a WordPress Varnish Purge plugin, it says to add the following line to wp-config.php: define('VHP_VARNISH_IP','127.0.0.1') This is specifically to work with proxy servers and/or CloudFlare to make sure the request goes to the Varnish server rather than CloudFlare, but that doesn't seem to help. Anyone see this before and have any idea?

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