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  • Java EE/GlassFish@Java2Days

    - by reza_rahman
    Java2Days 2012 was held in Sofia, Bulgaria on October 25-26. This was the third installment of the premier Java conference for the Balkan region, having three separate tracks for Java, the Cloud and Mobile. It attracted over a thousand enthusiastic, bright young developers and a number of world class speakers. There were no less than three full-house sessions on Java EE/GlassFish - one on Java EE 7, one on Domain-Driven Design using Java EE 6 and one on JSR 356/WebSocket. More details on Java EE/GlassFish@Java2Days, including slides and code examples, posted here.

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  • What is the most cross-browser/system compatible option for 3d graphics on a web page?

    - by LachlanB
    I would like to develop a bit of functionality for a web site that involves a bit of 3D - the user can move around objects, rotate them and texture them. So far I've looked into: WebGL (in particular three.js) and it looks great, but it's not supported in IE nor IOS. IOS supports the <canvas> tag, but only 2d. It looks like three.js has an unsupported hack to make a 3d thing use the 2d canvas instead without textures, but this looks like a hack. I also considered resorting to Flash which works on most browsers, but that won't work on IOS. What's my best option for doing 3d web graphics on the vast array of browsers and interfaces? At the moment I'm thinking WebGL for web (and ask people to use chrome or firefox, and take the hit on IE) and then maybe write a native app for IOS, but I am not sure if there are better alternatives available that I don't know of.

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  • Developing a search algorithm

    - by Richart Bremer
    I want to create a basic search engine, and I want you to give me some ideas how to filter out the best results for my visitors. I have three fields regarding a product the user can search in: Title Category Description I came up with these ideas and I ask you to either competently criticize them or add to them. If the search term occurs in all three fields it should be among the first results. If it is in two of the fields it is below the results of 1. Combine the amount of occurences and output a value in per cent. For instance if in all fields together the term clock appeared 50 times and in all fields together there are 200 words, then the per cent value is 50/200*100 = 25%. Another product entry amounts to say 20% so product one having 25% is listed before product two having 20%.

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  • Rotate an object given only by its points?

    - by d33tah
    I was recently writing a simple 3D maze FPP game. Once I was done fiddling with planes in OpenGL, I wanted to add support for importing Blender objects. The approach I used was triangulization of the object, then using Three.js to export the points to plaintext and then parsing the result JSON in my app. The example file can be seen here: https://github.com/d33tah/tinyfpp/blob/master/Data/Models/cross.txt The numbers represent x,y,z,u,v of a single vertex, which combined in three make a triangle. Then I rendered such an object triangle-by-triangle and played with it. I could move it back and forth and sideways, but I still have no idea how to rotate it by some axis. Let's say I'd like to rotate all the points by five degrees to the left, how would a code doing it look like?

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  • Multiple Passwords on One Account

    - by user110789
    I'd like to join three ideas into one interesting and sometimes useful feature. There was a question about using multiple passwords earlier this year, but it didn't receive much attention. I'd like to ask the question again after showing an interesting and new way to use the feature. The three original posts I found to be interestingly combined were: (1) Multiple passwords per user (2) http://blog.littleimpact.de/index.php/2009/09/14/automatic-encryption-of-home-directories-using-truecrypt-62-and-pam_exec/ (3) http://www.truecrypt.org/docs/hidden-volume Basically I'd like to login to my account with two passwords and depending on the password I use, I would get a different content in my home directory. In a way I would get a cryptographically hidden account into my system. So the question is, is it possible to allow multiple passwords to log on to Ubuntu/Linux for the same user?

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  • Why does service service_name status give different responses for different services?

    - by Code Ghar
    Running the "service service_name status" command gives three different types of output when three different service_names are used. I tried with atftpd, apache2, and isc-dhcp-server, as shown below. user@host:~$ service atftpd status Usage: /etc/init.d/atftpd {start|stop|restart|reload|force-reload} user@host:~$ service apache2 status Apache2 is running (pid 1103). user@host:~$ service isc-dhcp-server status isc-dhcp-server start/running, process 5696 Could this be because atftpd has not been converted to Upstart? The status for isc-dhcp-server shows "start/running" which indicates it has been converted to use Upstart. I would've thought apache2 would have been converted to Upstart already. If it has then why does it not display "start/running"?

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  • Better php framework for shared hosting

    - by ravz
    I need to develop an app for booking appointments. This is gonna be hosted in a shared server. So performance is the most important thing. I have used symfony2. I quite liked the framework. But seems to be heavy. Which framework would suit me considering my requirements? I have shortlisted three frameworks yii, symfony2 and ZF2. I am not asking which framework is better. All the three are good frameworks. I want to know which will suit my requirements. My first priority would be performance (I will be using AJAX wherever possible), second would be maintenance and development time and third community support. Or should I use my own handlers to separate views and logic and just use raw php?

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  • Architecture driven by users, or by actions/content?

    - by hugerth
    I have a question about designing MVC app architecture. Let's say our application has three main categories of views (items of type 1, items of type 2...). And we have three (or more in future) types of users - Admins, let's say Moderators and typical Users. And in the future there might be more of them. Admins have full access to app, Moderators can visit only 2/3 type of items, and Users can visit only basic type of items. Should I divide my controllers/views/whatever like this: Items "A", Items "B", Items "C", then make them 100% finished and at the end add access privileges? Pros: DRY option Cons Conditional expressions in views Or another options: Items "A" / Admin, Items "A" / Moderator / Items "B" Admin ...? Pros: Divided parts of application for specific user (is that pros?) Cons: A lot of repeated code I don't have great experience in planning such things so it would nice if you can give me some tips or links to learn something about it.

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  • What's the most unsound program you've had to maintain?

    - by Robert Rossney
    I periodically am called upon to do maintenance work on a system that was built by a real rocket surgeon. There's so much wrong with it that it's hard to know where to start. No, wait, I'll start at the beginning: in the early days of the project, the designer was told that the system would need to scale, and he'd read that a source of scalability problems was traffic between the application and database servers, so he made sure to minimize this traffic. How? By putting all of the application logic in SQL Server stored procedures. Seriously. The great bulk of the application functions by the HTML front end formulating XML messages. When the middle tier receives an XML message, it uses the document element's tag name as the name of the stored procedure it should call, and calls the SP, passing it the entire XML message as a parameter. It takes the XML message that the SP returns and returns it directly back to the front end. There is no other logic in the application tier. (There was some code in the middle tier to validate the incoming XML messages against a library of schemas. But I removed it, after ascertaining that 1) only a small handful of messages had corresponding schemas, 2) the messages didn't actually conform to these schemas, and 3) after validating the messages, if any errors were encountered, the method discarded them. "This fuse box is a real time-saver - it comes from the factory with pennies pre-installed!") I've seen software that does the wrong thing before. Lots of it. I've written quite a bit. But I've never seen anything like the steely-eyed determination to do the wrong thing, at every possible turn, that's embodied in the design and programming of this system. Well, at least he went with what he knew, right? Um. Apparently, what he knew was Access. And he didn't really understand Access. Or databases. Here's a common pattern in this code: SELECT @TestCodeID FROM TestCode WHERE TestCode = @TestCode SELECT @CountryID FROM Country WHERE CountryAbbr = @CountryAbbr SELECT Invoice.*, TestCode.*, Country.* FROM Invoice JOIN TestCode ON Invoice.TestCodeID = TestCode.ID JOIN Country ON Invoice.CountryID = Country.ID WHERE Invoice.TestCodeID = @TestCodeID AND Invoice.CountryID = @CountryID Okay, fine. You don't trust the query optimizer either. But how about this? (Originally, I was going to post this in What's the best comment in source code you have ever encountered? but I realized that there was so much more to write about than just this one comment, and things just got out of hand.) At the end of many of the utility stored procedures, you'll see code that looks like the following: -- Fix NULLs SET @TargetValue = ISNULL(@TargetValue, -9999) Yes, that code is doing exactly what you can't allow yourself to believe it's doing lest you be driven mad. If the variable contains a NULL, he's alerting the caller by changing its value to -9999. Here's how this number is commonly used: -- Get target value EXEC ap_GetTargetValue @Param1, @Param2, OUTPUT @TargetValue -- Check target value for NULL value IF @TargetValue = -9999 ... Really. For another dimension of this system, see the article on thedailywtf.com entitled I Think I'll Call Them "Transactions". I'm not making any of this up. I swear. I'm often reminded, when I work on this system, of Wolfgang Pauli's famous response to a student: "That isn't right. It isn't even wrong." This can't really be the very worst program ever. It's definitely the worst one I've worked

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  • posting array of text fields using jquery and ajax

    - by tabia
    i dont want to use serialize() function please help me with this. I am a beginner html <input type='button' value='Add Tier Flavor' id='Add'> <input type='button' value='Remove Tier Flavor' id='Remove'> <div id='batch'> <div id="BatchDiv1"> <h4>Batch #1 :</h4> <label>Flavor<input class="textbox" type='text' id="fl1" name="fl[]" value=""/></label></br> <label>Filling<input class="textbox" type='text' id="fi1" name="fi[]" value="" /></label></br> <label>Frosting<input class="textbox" type='text' id="fr1" name="fr[]" value=""/></label></br> </div> </div> <br> </div> this is a dynamically added fields using javascript the code is: javascript <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ var counter = 2; $("#Add").click(function () { if(counter>5){ alert("Only 5 Tiers allow"); return false; } var newBatchBoxDiv = $(document.createElement('div')).attr("id", 'BatchDiv' + counter); newBatchBoxDiv.html('<h4>Batch #'+ counter + ' : </h4>' + '<label> Flavor<input type="text" name="fl[]" id="fl' + counter + '" value=""></label><br>'+ '<label> Filling<input type="text" name="fi[]" id="fi' + counter + '" value=""></label><br>'+ '<label> Frosting<input type="text" name="fr[]" id="fr' + counter + '" value=""></label><br>' ); newBatchBoxDiv.appendTo("#batch"); counter++; }); $("#Remove").click(function () { if(counter==1){ alert("No more tier to remove"); return false; } counter--; $("#BatchDiv" + counter).remove(); }); }); </script> i am trying to post the values in an array to post it onto next .php page i am using this var user_cupfl = $('input[name^="fl"]').serialize(); var user_cupfi = $('input[name^="fi"]').serialize(); var user_cupfr = $('input[name^="fr"]').serialize(); serialize is not passing the values. :( on second page i am trying to mail it using $message .= "<tr><td><strong>Cake Flavors(according to batches):</strong> </td><td><pre>" .implode("\n", $user_cupfl). "</pre></td></tr>"; $message .= "<tr><td><strong>Filling type (Inside the cake):</strong> </td><td><pre>" .implode("\n", $user_cupfi). "</pre></td></tr>"; $message .= "<tr><td><strong>Frosting type (top of the cake):</strong> </td><td><pre>" .implode("\n", $user_cupfr). "</pre></td></tr>"; i m posting array like this $user_cupfl=filter_var($_POST["userCupfl"], FILTER_SANITIZE_STRING); $user_cupfi=filter_var($_POST["userCupfi"], FILTER_SANITIZE_STRING); $user_cupfr=filter_var($_POST["userCupfr"], FILTER_SANITIZE_STRING); your replies will be highly appreciated

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  • SCCM 2012 - some remote clients unable to download some applications, 401.2 error

    - by growse
    I've got a small SCCM 2012 deployment with about 35 clients attached. Most of these clients are in the same network as the single SCCM host, but three are about 1000 miles away. Oddly, these three clients have stopped being able to download some application packages over BITS. Publishing a new package works for all the other clients, but for these three it never seems to download. If I go to the software centre, it just hangs at "0% downloaded". On the client, the DataTransfer.log says (repeatedly): CDTSJob::HandleErrors: DTS Job '{2DCBBB4C-6D84-479A-9218-885B72C834B9}' BITS Job '{E78147DD-4A26-4942-B4FD-6EC3EB77EECD}' under user 'S-1-5-18' OldErrorCount 442 NewErrorCount 443 ErrorCode 0x80072EE2 DataTransferService 30/07/2012 09:27:41 2964 (0x0B94) CDTSJob::HandleErrors: DTS Job ID='{2DCBBB4C-6D84-479A-9218-885B72C834B9}' URL='http://sccm-host:80/SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1' ProtType=1 DataTransferService 30/07/2012 09:27:41 2964 (0x0B94) Cas.log says (repeatedly): Location update from CTM for content Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1 and request {AD041FCB-03D2-4FE6-A6FA-38A6B80FB2A1} ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) Download location found 0 - http://lonsbrndsccm02.mcs.int.thomsonreuters.com/SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1 ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) Download request only, ignoring location update ContentAccess 30/07/2012 08:33:39 5048 (0x13B8) On the server, I've enabled failed request log tracing. The raw IIS log says the following: 2012-07-30 08:28:42 10.13.111.35 GET /SMS_DP_SMSPKG$/Content_3e7f6982-6346-4f27-ae00-ad5dcb391455.1/sccm /NSCP-0.4.0.172-x64.msi 80 - 10.2.27.19 Microsoft+BITS/7.5 401 2 5 293 Which is a 401.2 error, meaning access denied. The failed request log is large, but the punchline is that it chucks out a Unauthorized: Access is denied due to invalid credentials. message. All clients are members of the same domain and appear to be (otherwise) working great. I've re-installed the SCCM client, deleted and re-added the computer to SCCM. Some other packages seem to work fine, the daily anti-malware delta gets downloaded and patched without issue. Why are these packages failing?

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  • Virtualization and best hardware sharing scenario for me

    - by azera
    Hello, Following this thread on super user, I now want to start installing all my vm on the hardware. As a remainder, i have a (powerful enough) server on which i want to install 3 OS: there is a debian (general dev testbed purposes), an ipcop (network control/firewall) and a freenas (local network file sharing). I'm wondering which scenario would be the best for me and if I will be able to share the hardware to do what i want; either a - install an hypervisor like the free vmware esx and all three vms in it, or b - install debian, and the other two running inside it with virtual box My need being that: the ipcop should handle all network traffic to the internet, meaning all traffic from my main computer but also all traffic from the other two vm the freenas shares should be accessible from the other two vm and my main computer too i don't really care about the debian access, i only need to access it from my main computer, not the other vms Will I need to install additionnal network cards for each vm or can they all share the same one happily ? (right now I have two, one linking the server to my router [which only ipcop is gonna use] and one linking it to my switch [which i would like all three to use]) As for harddrives, I was going to use 1 harddrive cut in 3 partitions to install all three OSes, then add to that the freenas drives, will it be correct ? Thanks a lot for anyone who can help me, this is kind of a vast area and I'm not sure which way to go at all

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  • Rebuild Apple RAID set

    - by Clinton Blackmore
    We have a Mac Pro tower with an Apple RAID card in it using third party drives. When one drive failed, we replaced it and the RAID 5 set was nearly done rebuilding when the computer was rebooted. It did not come back up. We are now booting up off of a different internal volume, and have three (third-party) drives of identical spec (including revision and firmware) in the box. One of the drives is a global spare; the other two are recognized as belong to a RAID set but are in "Roaming" mode. The intention is to recreate the three-drive RAID set using the data on the two drives that are good. When we tell the system to create a RAID 5 using the three drives, it tells us that it'll create a RAID set but everything will be lost. There are no obvious options to rebuild a RAID using the two good drives and incorporating the third drive in Apple's RAID Utility, and we've looked through the options for the raidutil command. Fortunately, all important data is backed up, and we can rebuild from scratch, but, is there any way to make the RAIDset work again?

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  • Deploying Windows Service through group policy fails with Event ID 102

    - by Sören Kuklau
    I'm trying to deploy a custom Windows Service (written in C#; installed through a VS setup project) using a group policy. To help debug this, I also have two additional MSIs in the same policy. All three packages are deployed as a machine policy, not a user one. On one machine (runs Windows Server 2008; no UAC), all three deploy fine. The service is set to Automatic, as expected. On two machines (run Windows 7; UAC), the two other MSIs deploy fine, but my service fails to install. The event log gives an event ID of 102, which appears to be a permissions problem: The install of application "Package Name" from policy "Policy Name" failed. The error was The installation source for this product is not available. Verify that the source exists and that you can access it. However, all three packages come from the same share linked through UNC, so this is unlikely. My guess is that UAC is the problem; that the service requires additional permissions. Do I need to alter the MSI somehow?

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  • Two screens hooked to one laptop

    - by mplacona
    Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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  • Two screens hooked to one laptop

    - by mplacona
    Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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  • KVM Hosting: How to efficiently replicate guests

    - by javano
    I have three KVM servers each with 1 guest VM, running directly on it's local storage, (so they are essentially getting a dedicated box worth of computing power each). In the event of a host failure I would like the guests replicated to at least one of the other hosts so I can spin it up there, until the failing host is fixed. I am curious about KVM cloning. I can clone a VM live or when it's suspended/shutdown. Obivously suspended VMs will naturally be quicker to clone but these three VMs comprise three parts of a single solution, so I don't want to ever have any one of them shutdown. How can I efficiently clone these VMs between servers? I have had a couple of ideas, but are these insane or, is there a better method I have missed for my scenario? Set up a DRDB partition between box 1 and 2 where VM 1 runs from, and so is replicated between box1 and box 2, repeat between box 2 & 3, and box 3 & 1 (This could be insane, I have never used DRDB only read about it) Just use standard KVM CLI clone options to perform live clones (I'm dubious about this because I don't know how long it will take and what the performance impact will be during) Run a copy of each VM on at least one other host, and have the guest on one host export it's data to the matching guest on another host where it can import that data, scripting this on the guest) Some of other way? Ideas welcome! Side Note These servers have 4x15k SAS drives in a RAID 10 so they aren't rocketing fast, and as I mentioned, each VM runs from the host's local storage, no NAS or SAN etc. So that is why I am asking this question about guest replication. Also, this isn't about disaster recovery. Guests will be exporting their data to a NAS over a VPN, so I am looking at how I can have them quickly spun up in a host failure situation.

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  • Is there a limit to how many sites can be hosted on a single IP address when using HTTP Host Headers on Windows 2008?

    - by Kev
    For reasons that are lost in the mists of time, our older Windows (2000, 2003) servers have been configured with a "Administrative" IP address and three further "Hosting" IP addresses. There are also additional IP's for sites with SSL certificates. The "Administrative" IP address is where all our internal provisioning, monitoring and other such apps are bound to. We lock this down and don't permit access to it from the outside world (other than over our VPN). The three "Hosting" IP addresses are used for IIS website hosting (in conjunction with host headers). Historically, new site IP address allocations have been rotated through these three IP addresses. I'm not really sure why. I'm building a new batch of servers and I'm considering just having a single hosting IP address. Our servers can host up to 1200 sites on a single machine. Is there a technical limit to the number of IIS sites that can bind to a single IP address? Our Linux platform seems to do just fine with just a single shared IP + host headers. I initially thought this might be an SEO thing, but given that IPv4 address space conservation is paramount I hardly think Google or other search engines could reasonably penalise site rankings just because hundreds of sites hang off the same IP.

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  • Can a non-redundant RAID5 cause any serious problems (compared to RAID0)?

    - by leemes
    I used to have a three-disc RAID5 (mdadm) in my computer for personal media storage (music, videos, photos, programs, games, ...). It had three discs with 750 GB each, resulting in an array capacity of 1.5 TB. One day (one year ago), I needed one of those discs to install another operating system. I thought, I don't need the redundancy anymore since I backup the most important stuff (personal photos e.g.) on an external disc anyway. So I decided to remove one of the three discs without converting the RAID to RAID0 or even two separate discs, because I had no temporary storage (since one cannot simply convert the RAID5 to RAID0 AFAIK). So now, for about one year, I have a non-redundant RAID5 with 2 of 3 discs running. Sometimes, one of the discs has a defective contact at the power cable or something similar causing the drive to stop working temporarily (I don't know exactly what it is). Since it still works when rebooting the computer and in most cases by calling some mdadm commands, it wasn't that problematic. Note that the data is not very critical, since I still have a backup of the most important stuff. But in the last few weeks, one of the drives fails very frequently (every few hours), so it gets really annoying to manage this. My questions are: Is there any disadvantage (apart from the annoying management) of a non-redundant RAID5 (with one drive less than typical) over a RAID0? If I understand it correctly, both have no redundancy and the same capacity. On a temporary drive failure, I can restart the array in both cases, assuming that the drive itself still works after the failure. Can it happen that the drive contents alter on a drive failure, making the array inconsistent? If so, can I tell mdadm to check the array for failures (without a file system level checking tool)? Since the drive most probably only has a defective contact causing it to fail for a second only, can I tell mdadm to automatically restart the array, so I will not even notice the failure if no application wanted to access the file system during the failure?

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