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• Burned CD-R are not identical to the input iso image, why?

  - by Grumbel

  I have the issue that sometimes when I burn an iso image to a CD-R with: sudo wodim -v driveropts=burnfree -data dev=/dev/scd0 input.iso And then read it back out again with: sudo dd if=/dev/cdrom of=output.iso dd: reading `/dev/cdrom': Input/output error ... That I end up with two iso images that are not identical, namely the output.iso is missing 2048 bytes at the end. When I however mount the iso image or CD-R and compare the actual files on the mountpoint, both are identical. Is that expected behavior or is that an actually incorrect burn of the data? And if its expected, how can I verify that the burn process was successful? The reason why I ask in the first place is that it seems to be reproducible behavior, certain iso images come out 2048 bytes short, even on repeated burns, but all burned CD-Rs are under themselves identical. Also what is the reason behind the: dd: reading `/dev/cdrom': Input/output error As it happens always, I assume it is normal, but what is the technical reason behind it? I assume CDs don't allow the device to detect the size directly, so dd reads till it encounters the end the hard way. Edit: User karol on superusers.com mentioned that both the size issue and the read error are the result of using -tao (default) in wodim instead of -dao mode. I couldn't yet test it, but it sounds like the most plausible explanation so far.

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• Good Scoop: The PeopleSoft/IBM Backstory

  - by [email protected]

  By Brian Dayton on April 12, 2010 11:15 AM Sometimes you're searching for something online and you find an unrelated, bonus nugget. Last week I stumbled across an interesting blog post from Chris Heller of a PeopleSoft consulting shop in San Ramon, CA called Grey Sparling. I don't know these guys. But Chris, who apparently used to work on the PeopleTools team, wrote a great article on a pre-acquisition, would-be deal between IBM and PeopleSoft that would have standardized PeopleSoft on IBM technology. The behind-the-scenes perspective is interesting. His commentary on the challenges that the company and PeopleSoft customers would have encountered if the deal had gone through was also interesting: · "No common ownership. It's hard enough to get large groups of people to work together when they work for the same company, but with two separate companies it is much, much harder. Even within Oracle, progress on Fusion applications was slow until Thomas Kurian took over Fusion applications in addition to Fusion middleware." · "No customer buy-in. PeopleSoft customers weren't asking for a conversion to WebSphere, so the fact that doing that could have helped PeopleSoft stay independent wouldn't have meant much to them, especially since the cost of moving to whatever a "PeopleSoft built on WebSphere" would have been significant." · "No executive buy-in. This is related to the previous point, but it's worth calling out separately. If Oracle had walked away and the deal with IBM had gone through, and PeopleSoft customers got put through the wringer as part of WebSphere move, all of the PeopleSoft project teams would be put in the awkward position of explaining to their management why these additional costs and headaches were happening. Essentially they would need to "sell" the partnership internally to their own management team. That's not a fun conversation to have." I'm not surprised that something like this was in the works. But I did find the inside scoop and Heller's perspective on the challenges particularly interesting. Especially the advantages of aligning development of applications and infrastructure development under one roof. Here's a link to the whole blog entry.

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• HTML5 Development for Dummies

  - by Geertjan

  What's HTML5 all about and what does it actually mean, concretely, to develop HTML5 applications? NetBeans IDE 7.3 provides something called "Project Easel", which is a bundling of HTML5-related tools into a coherent toolset. Within a matter of hours, you'll know everything you need to know about what all this is about if you follow the steps below.  Get A Solid Overview. Start by viewing this screencast from JavaOne 2012 (click the media link on the right side once you've clicked the link below, a downloadable MP4 file is also available there):https://oracleus.activeevents.com/connect/sessionDetail.ww?SESSION_ID=4038That is an awesome way to get you in the right mindframe for what HTML5 is and how it fits into the programming world, together with a very cool and entertaining demo, presented by JB Brock. He starts with about three slides and then does a super awesome demo that puts you into the picture very quickly. Understand How HTML5 Relates To Java EE. Now here's a very cool follow up to the above, again demo-driven (click the media links on the right side once you've clicked the link below):https://oracleus.activeevents.com/connect/sessionDetail.ww?SESSION_ID=4737David Konecny takes the Affable Bean project created via the NetBeans E-commerce Tutorial and creates an HTML5 front end for it! I.e., you are shown how HTML5 can provide a different front end, as an alternative to JSF. Why would you do that? Well, that's explained in David's session, as well as in JB Brock's session, i.e., choose the right technology for the right situation. Sometimes HTML5 might make sense, other times JSF might make sense. Follow The NetBeans Screencasts. To revise and firm up everything you've learned from the above two JavaOne sessions, watch two screencasts by Ken Ganfield, part 1, Getting Started with HTML5 and part 2, Working with JavaScript in HTML5 Applications. In particular, you'll learn how NetBeans IDE provides tools to thoroughly cover the needs of HTML5 developers. Having taken the above three steps, you now have a thorough background, together with an understanding of the tools and procedures needed for creating your own HTML5 applications.

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• How do graphics programmers deal with rendering vertices that don't change the image?

  - by canisrufus

  So, the title is a little awkward. I'll give some background, and then ask my question. Background: I work as a web GIS application developer, but in my spare time I've been playing with map rendering and improving data interchange formats. I work only in 2D space. One interesting issue I've encountered is that when you're rendering a polygon at a small scale (zoomed way out), many of the vertices are redundant. An extreme case would be that you have a polygon with 500,000 vertices that only takes up a single pixel. If you're sending this data to the browser, it would make sense to omit ~499,999 of those vertices. One way we achieve that is by rendering an image on a server and and sending it as a PNG: voila, it's a point. Sometimes, though, we want data sent to the browser where it can be rendered with SVG (or canvas, or webgl) so that it can be interactive. The problem: It turns out that, using modern geographic data sets, it's very easy to overload SVG's rendering abilities. In an effort to cope with those limitations, I'm trying to figure out how to visually losslessly reduce a data set for a given scale and map extent (and, if necessary, for a known map pixel width and height). I got a great reduction in data size just using the Douglas-Peucker algorithm, and I believe I was able to get it to keep the polygons true to within one pixel. Unfortunately, Douglas-Peucker doesn't preserve topology, so it changed how borders between polygons got rendered. I couldn't readily find other algorithms to try out and adapt to the purpose, but I don't have much CS/algorithm background and might not recognize them if I saw them.

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• Intelligence as a vector quantity

  - by Senthil Kumaran

  I am reading this wonderful book called "Coders at Work: Reflections on the Craft of Programming" by Peter Seibel and I am at part wherein the conversation is with Joshua Bloch and I found this answer which is an important point for a programmer. The paragraph, goes something like this. There's this problem, which is, programming is so much of an intellectual meritocracy and often these people are the smartest people in the organization; therefore they figure they should be allowed to make all the decisions. But merely the fact they are the smartest people in the organization does not mean that they should be making all the decisions, because intelligence is not a scalar quantity; it's a vector quantity. Here at the last sentence, I fail to get the insight which is he trying to share. Can someone explain it in a little further as what he means by a vector quantity, possibly trying to present the same insight. Further down, I get the point that he is not taking about having an organization where non-technical people (sometimes clueless) can be managers of the technical people for some reason that they can spend more time to write emails well, because the very next statement following the above paragraph was. And if you lack empathy or emotional intelligence, then you shouldn't be designing APIs or GUIs or languages. I understand that he is saying that in Software engineering, programmers should know how the users will see their product and design for them. I felt the above paragraph was very interesting.

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• Terminology: .NET C++ vs. traditional C++

  - by Mike Clark

  Hello. I've recently been working with a team that's using both .NET C++ and pre-.NET C++. I fully understand the technical differences between the two technologies. However, I sometimes feel like I'm floundering when it comes to the terminology used to differentiate the two. Example: Say we have two projects: ProjectA contains "C++" code that builds a .NET assembly DLL. ProjectB contains Visual C++ code that builds a traditional native Windows DLL. What is the best way to succinctly and terminologically draw a distinction between the two projects? Again, I'm not asking for an in-depth technical description of the differences between the two technologies. I'm just looking for names and labels. This is how I might try to make the distinction when talking to someone about Project A and Project B: "ProjectA is a managed .NET C++ project" and ProjectB is an unmanaged Visual C++ DLL project." However I am not at all certain that this terminology is ideal, or even correct. Please describe what you feel the ideal language to use in this situation (or similar situations) might be. Feel free to motivate your answer.

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• C4C - 2012

  - by Timothy Wright

  C4C, in Kansas City, is always a fun event. At points it gets to be a pressure cooker as you zone in trying to crank out some fantastic code in just a few hours, but it is always fun. A great challenge of your skill as a software developer and for a good cause. This year my team helped The United Cerebral Palsy of Greater Kansas City organization to add online job applications and a database for tracking internal training. I keep finding that there is one key rule to pulling off a successful C4C weekend project, and that is “Keep It Simple”. Each time you want to add that one cool little feature you have to ask yourself.. Is it really necessary? and Do I have time for that? And if you are going to learn something new you should ask yourself if you’re really going to be able to learn that AND finish the project in the given time. Sometimes the less elegant code is the better code if it works. That said… You get a great amount of freedom to build the solution the way you want. Typically, the software we build for the charities will save them a lot of money and time and make their jobs easier. You are able to build the software you know you are capable of creating from your own ideas. I highly recommend any developers in the area to signup next year and show off your skills. I know I will!

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• How was Git designed?

  - by Mark Canlas

  My workplace recently switched to Git and I've been loving (and hating!) it. I really do love it, and it is extremely powerful. The only part I hate is that sometimes it's too powerful (and maybe a bit terse/confusing). My question is... How was Git designed? Just using it for a short amount of time, you get the feel that it can handle many obscure workflows that other version control systems could not. But it also feels elegant underneath. And fast! This is no doubt in part to Linus's talent. But I'm wondering, was the overall design of git based off of something? I've read about BitKeeper but the accounts are scant on technical details. The compression, the graphs, getting rid of revision numbers, emphasizing branching, stashing, remotes... Where did it all come from? Linus really knocked this one out of the park and on pretty much the first try! It's quite good to use once you're past the learning curve.

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• Swap, Swapiness and Standby: swapping starts when waking up

  - by mdo

  I'm running running Ubuntu 12.04 on a Lenovo W500 (Core2Duo T9400, 4GB Ram) Current kernel: 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux -- but the problems exists since a couple of months, surviving quite a few software (includig kernel) updates I regularly put my machine into suspend-to-ram (S3) and when the machine comes back up Ubuntu starts to swap out processes. I was able to observe that the used swap-space starts to grow right after the box returns. See munin graphs below, the gap (obviously) shows the timeframe in STR. Needless to say that the box becomes unusable while swapping, load goes up beyond 10. What I've done so far: lowered swappiness from default (60) to 10 (via /etc/sysctl.conf: vm.swappiness=10) -- this has improved the situation much, but sometimes the problem comes back, I have not found a trigger (like memory usage) for this for now lowered swappiness to 5 -- perhaps this has brought an improvement again Before going to STR the box ran stable without (swapping) problems for hours. Today when the issue showed up again I used this script (- http://stackoverflow.com/questions/479953/how-to-find-out-which-processes-are-swapping-in-linux) to find what processes have the most used swap space. The result after the swap orgy is like that (all PIDs with more than 10M usage): Overall swap used: 2121344 kB ======================================== kB pid name ======================================== 439520 17491 java 208148 22719 firefox 136640 4337 /usr/bin/quodli 120852 5271 chrome 81832 5264 chrome 74284 17003 chrome 65368 16960 chrome 57088 3675 chrome 56184 30923 chrome 54412 11331 chrome 54264 3878 chrome 51508 18382 chrome 50088 3163 zeitgeist-fts 49772 15543 chrome 41344 15355 compiz 35040 1161 mysqld 32124 18374 chrome 30940 11339 chrome 30044 5752 chrome 28780 4235 plugin-containe 24576 31246 empathy-chat 23840 17703 chrome 22512 3207 ubuntuone-syncd 21588 1937 ntop 18336 2021 asterisk 17200 3915 chrome 13964 1935 Xorg 12036 10679 chrome 11104 30782 empathy 11056 2889 python 10932 16565 knotify4 The java instance at the top is IntelliJ. IntelliJ, Firefox and Chrome also were all used right before the box was put to STR. So my question is: can I somehow prevent these swapouts AND why do they happen? Is it perhaps related to some misidentification of idle processes? I'm not looking for resolutions like: turn off swap buy more RAM Thanks in advance!

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• WPF and Composite Application Library &ndash; Missing The Point

  - by David Totzke

  I have a headache and it’s not even 9AM yet.  Well, ok, it’s nearly ten here now in GMT –5 but it’s before nine somewhere still. Sometimes people will miss the point of something so utterly and completely that one is left wondering how such a person can even dress themselves. Writing an application using WPF and the Composite Application Library (Prism) means that one must learn the various programming idioms common to these frameworks.  The Windows Forms event driven model simply will not suffice.  You need to come to grips with the idea of a very loosely coupled application.  Concepts that must be absorbed and internalized include Data Binding, Control and Data Templates, Commands, Dependency Injection, and Inversion of Control, as well as the Supervising Controller, Presentation Model and Model-View-View-Model patterns. It is as simple as that.  Not to embrace these concepts is to invite pain.  It is to invite noodles; and not the holy kind. Someone actually said to me that “just because it’s not WPF, doesn’t mean it’s wrong.”  And he’s right.  Unless, of course, you are writing a WPF application and especially if you are using the Composite Application Library. In simple terms then; YOU’RE DOING IT WRONG!   Dave Just because I can…

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• Limiting game loop to exactly 60 tics per second (Android / Java)

  - by user22241

  So I'm having terrible problems with stuttering sprites. My rendering and logic takes less than a game tic (16.6667ms) However, although my game loop runs most of the time at 60 ticks per second, it sometimes goes up to 61 - when this happens, the sprites stutter. Currently, my variables used are: //Game updates per second final int ticksPerSecond = 60; //Amount of time each update should take final int skipTicks = (1000 / ticksPerSecond); This is my current game loop @Override public void onDrawFrame(GL10 gl) { // TODO Auto-generated method stub //This method will run continuously //You should call both 'render' and 'update' methods from here //Set curTime initial value if '0' //Set/Re-set loop back to 0 to start counting again loops=0; while(System.currentTimeMillis() > nextGameTick && loops < maxFrameskip){ SceneManager.getInstance().getCurrentScene().updateLogic(); //Time correction to compensate for the missing .6667ms when using int values nextGameTick+=skipTicks; timeCorrection += (1000d/ticksPerSecond) % 1; nextGameTick+=timeCorrection; timeCorrection %=1; //Increase loops loops++; } render(); } I realise that my skipTicks is an int and therefore will come out as 16 rather that 16.6667 However, I tried changing it (and ticksPerSecond) to Longs but got the same problem). I also tried to change the timer used to Nanotime and skiptics to 1000000000/ticksPerSecond, but everything just ran at about 300 ticks per seconds. All I'm attempting to do is to limit my game loop to 60 - what is the best way to guarantee that my game updates never happen at more than 60 times a second? Please note, I do realise that very very old devices might not be able to handle 60 although I really don't expect this to happen - I've tested it on the lowest device I have and it easily achieves 60 tics. So I'm not worried about a device not being able to handle the 60 ticks per second, but rather need to limit it - any help would be appreciated.

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• What is the way to submit a patch to fix all the damage that LP: #600941 causes?

  - by nutznboltz

  What is the best way to submit a patch to fix all the damage that LP: #600941 causes? I ask because LP: #600941 was put into every version of Ubuntu still supported at this time. Should I pick a particular version and run ubuntu-bug on it? Should that version be the LTS or Oneiric or Precise (how can I get Precise if I need it?) The story is that after it was pushed out all of our systems started experiencing Nagios nrpe restart failures. Commands like /etc/init.d/nagios-nrpe-server restart would cause nrpe to stop but not restart. I tracked this down to the way that the /etc/init.d/nagios-nrpe-server script is calling start-stop-daemon. The issue is that the "stop" stanza in the /etc/init.d/nagios-nrpe-server script first calls start-stop-daemon which sends SIGTERM to nrpe and then waits only for one second. If nrpe has not exited by that time the pid file will still exist and the /etc/init.d/nagios-nrpe-server script will remove it. Worse if /etc/init.d/nagios-nrpe-server restart is used not only will the pid file be removed, the attempt to restart nrpe will fail provided that the nrpe daemon is still tardy in shutting down. The attempt to start under those circumstances will fail because nrpe will still be bound to a socket and the second attempt at binding will cause the nrpe startup to abort. They should have wondered why there was a comment about "sometimes the pid file does not get removed". They should have tested on systems that have a heavy load and therefore slow nrpe response times. The fix is to add --retry 10 or such to the invocation of start-stop-daemon ... --stop ... Thanks

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• What to watch out for when writing code at an Interview?

  - by Philip

  Hi, I have read that at a lot of companies you have to write code at an interview. On the one hand I see that it makes sense to ask for a work sample. On the other hand: What kind of code do you expect to be written in 5 minutes? And what if they tell me "Write an algorithm that does this and that" but I cannot think of a smart solution or even write code that doesn't semantically work? I am particularly interested in that question because I do not have that much commercial programming experience, 2 years part-time, one year full-time. (But I am interested in programming languages since nearly 15 years though usually I was more concentrated in playing with the language rather than writing large applications...) And actually I consider my debugging and problem solving skills much better than my coding skills. I sometimes see myself not writing the most beautiful code when looking back, but on the other hand I often come up with solutions for hard problems. And I think I am very good at optimizing, fixing, restructuring existing code, but I have problems with writing new applications from scratch. The software design sucks... ;-) Therefore I don't feel comfortable when thinking about this code writing situation at an interview... So what do the interviewers expect? What kind of information about my code writing are they interested in? Philip

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• Keyboard layout - certain keys work with AltGr, other doesn't

  - by user23122

  I run Ubuntu 12.04 in VirtualBox 4.3.14 on Windows 7 with a Swedish keyboard layout. In Windows everything works fine but in Ubuntu some keys/characters (the most important for a programmer) doesn't work. This is the result from pressing the keys in the top row 1234567890+´ (Unmodified top row on keyboard) @£$€ {[]}\ (Windows with AltGr) ¡ £$€¥ ± (Ubuntu with "AltGr") More characters are broken (pipe | is a notable example) but the top row is the biggest problem. I can workaround this by enabling "direct connection" from my USB keyboard to VirtualBox but then I have to manually disable that every time I switch out of VirtualBox. I have tried different keyboard layout, sometimes @ et al works but then other characters are broken. I also tried sudo dpkg-reconfigure keyboard-configuration with default values, but it didn't change anything. I have guest additions installed (from the built in virtual CD). I got my VB disk image from a colleague who does not have this problem, however, he does not have guest additions installed (and hence can't use a higher resolution than 1024x768, and I need to run Ecplipse...). He also have different installation of Virtual Box and Windows. For example, the key for 2 should, in Ubuntu, produce four different characters, 2"²@. The first three works fine, including superscript 2 that requires AltGr-Shift-2, it is just plain AltGr-2 to get @ that does not work on this key (and all the other keys I have problem with). Any ideas for a fix?

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• Iphone/Android app – chatroom development – what framework & hosting needs?

  - by MikaelW

  I have some experience regarding IPhone and Android development but I am now struggling to solve a new class of problem: apps that involve a client/server chatroom feature. That is, an app when people can exchange text over the internet, and without having the app to constantly “pull” content from the server. So that problem can’t be solved with a normal php/mysql website, there must be some kind of application running on a server that is able to send message from the server to the phone, rather than having the phone to check for new messages every 10 seconds… So I’m looking for ways to solve the different problems here: What framework should I use on the two sides (phone / server)? It should be some kind of library that doesn’t prevent me to write paid apps. It should also be possible to have the same server for the Iphone and android version of the app. What server / hosting solution do I need with what sort of features, I just have no experience regarding server application that can handle and initiate multiple connections and are hosted on hardware that is always online I tried to find resources online but couldn’t so far, either the libraries had the wrong kind of license/language or I just didn’t understand… Sometimes there were nice tutorial but for different needs such as peer2peer chat over local network… Same with the server and the hosting problem, not sure where to start really, I’m calling for help and I promise I will complete this page with notes about the experience I will get :-) Obviously the ideal would be to find a tutorial I missed that include client code, server code and a free scalable server… That being said, If I see something as good, it probably means that I have eaten the wrong kind of mushroom again… So, failing that, any pointer which might help me toward that quest, would be greatly appreciated. Thanks in advance. Mikael

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• Column order can matter

  - by Dave Ballantyne

  Ordinarily, column order of a SQL statement does not matter. Select a,b,c from table will produce the same execution plan as   Select c,b,a from table However, sometimes it can make a difference.   Consider this statement (maxdop is used to make a simpler plan and has no impact to the main point):   select SalesOrderID, CustomerID, OrderDate, ROW_NUMBER() over (Partition By CustomerId order by OrderDate asc) as RownAsc, ROW_NUMBER() over (Partition By CustomerId order by OrderDate Desc) as RownDesc from sales.SalesOrderHeader order by CustomerID,OrderDateoption(maxdop 1) If you look at the execution plan, you will see similar to this That is three sorts.  One for RownAsc,  one for RownDesc and the final one for the ‘Order by’ clause.  Sorting is an expensive operation and one that should be avoided if possible.  So with this in mind, it may come as some surprise that the optimizer does not re-order operations to group them together when the incoming data is in a similar (if not exactly the same) sorted sequence.  A simple change to swap the RownAsc and RownDesc columns to produce this statement : select SalesOrderID, CustomerID, OrderDate, ROW_NUMBER() over (Partition By CustomerId order by OrderDate Desc) as RownDesc , ROW_NUMBER() over (Partition By CustomerId order by OrderDate asc) as RownAsc from Sales.SalesOrderHeader order by CustomerID,OrderDateoption(maxdop 1) Will result a different and more efficient query plan with one less sort. The optimizer, although unable to automatically re-order operations, HAS taken advantage of the data ordering if it is as required.  This is well worth taking advantage of if you have different sorting requirements in one statement. Try grouping the functions that require the same order together and save yourself a few extra sorts.

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• 10 Tech Products Ahead of Their Time [Video]

  - by Jason Fitzpatrick

  Sometimes a product just can’t help but be too far ahead of it’s time to be adopted. Check out these 10 products that had their moment of glory a moment (or a decade) too soon. At Mashable they’ve gathered up 10 products that hit the market too soon for people to really appreciate them. Among them, as seen in the video above, a super simple internet-focused computer. At the time it hit the market people simply didn’t get the value of having a cheap, easy to use internet terminal. It probably didn’t help much that the 1990s internet didn’t have the plethora of powerful and useful web-based applications we have now. None the less we now have tons of lightweight and “underpowered” devices focused on the internet experience (like netbooks, iPads, smart phones, chromebooks, and more). Hit up the link below to see the 9 other gems from their collection of products ahead of their times. 10 Tech Products Ahead of Their Time [Mashable] How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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• What are the pros and cons about developing under MAC OS? [closed]

  - by user827992

  Sometimes i get the chance to program under MAC OS, i knew about this OS since Apple shipped its computers with a PowerPC by Motorola ( since Panther, more or less ), these days they are all X86 and i see no particular advantages about adopting this platform, also i see only downsides for the main part, i do not want to cause flames, please reply if you have a good answer or you can contribute in some constructive way. I'm trying to write a list of the natively supported languages, or the languages that comes only under MAC OS with some particular technology, my list is this: Objective C with Cocoa/Carbon I'm not considering personal preferences here, if a person X likes to code under Xcode it's probably ok to have a MAC, if a person Y likes to code under Visual Studio it's probably ok to not having a MAC, my purpose is to clarify what MAC OS is good for. I also do not get why people glorify the MAC for historical reasons, I mean a language like Java just comes for MAC only in the 7th edition of its JDK, things like GCC are just a porting and many technologies are out of the question like C# ( I'm sorry, i do not consider MonoDevelop like a serious alternative ) , .Net, ASP, DirectX, and many others are just, again, porting or free software, like PHP, MySQL, Javascript, XML, CSS, OpenGL, etc etc. My question is: what is so special about being a programmer under MAC OS? There is something that I have not seen? I also noticed that a significant portion of MAC users end up using their MAC like a normal Windows PC with Parallels or something like that. I can afford to buy a MAC, show me why this machine is so unique.

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• Ubuntu 12.10 boots to purple or black screen but intermittently boots fine

  - by Nic

  I have a fresh install of Ubuntu 12.10 64bit dual booting with Win7 64bit. Windows boots fine every time. When I choose Ubuntu from Grub2 menu it will sometimes boot just fine. Most of the times though it gets stuck at a purple screen with nothing happening and no keys or key combinations working. Other times instead of the purple screen I get a black screen with a flashing cursor at the top. Nothing happens. I need to hold down the power button to restart and after a couple times of trying it will eventually boot into Ubuntu. Once that happens everything runs without any problems. I have tried different approaches to fix the problem but to no avail. I tried removing "quiet splash", used no splash, and nomodeset What I got from this was seeing all the text of the boot process but more often than not the process gets stuck right after recognizing all the USB ports and devices. If it gets stuck nothing happens (except when i plug in a usb device: it still recognizes it with a new line of text) In the case when the boot process works, after it lists the usb devices it tells me something like: recovery of read-only filesystem necessary. (its the filesystem that ubuntu runs on) then it does the recovery and i get: recovery complete. after that Ubuntu will boot properly and I get to see the login screen. I have no idea what to do to fix that problem. I have to reboot 3 to 5 times everytime I want to get into Ubuntu and I feel like I'm breaking my new Laptop. (its a lenovo ideapad z580 btw. i5 processor and nvidia gtx640 graphics card) I hope someone can help me. Thanks. Edit: i just got a "failed to enable AA error" message when waking it up from suspend. I don't know if that helps or has anything to do with the boot probs.

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• How can I make video games if I don't like programming?

  - by hoper

  I am studying C++ code in my school (my major is computer programming). Honestly, my grades are not so good, and assignments are really hard. Sometimes I feel sad that I will spend 8-10 hours per day coding (which is stressful) in the future for my job. But I still want to make video games. Maybe this is the only reason why I am taking all of these stressful courses. I always write down plots, stories, characters, fictional gaming worlds... Once, I thought I should study artistic technology such as game design and not computer technology such as C++, C#, etc. However, most of popular game designers (or directors) such as Kojima, Miyamoto, etc. used to be good programmers. Companies actaully assign programmers to directors because they understand how to make a game. I've try to find other colleges or universities where they teach game design programs. However, one article that lists rank 10 game design schools in North America seems untrustful because the survey company only scores it from intervews of students. Once, I tried to attend Art Institute of Vancouver which is rank 7 according to that article. However, one programmer who used to be an instructor in there told me the truth: the employement rate of graduated students is low. How can I have a future making games if I don't like programming?

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• Top 10 solution documents for Weblogic Server J2EE Feb 2014 - May 2014

  - by jhpierce -Oracle

  The following are the top 10 documents linked to SRs as solutions, for Weblogic Server J2EE issues, from Feb 2014 thru May 2014. 1163020.1 How to configure Filtering class loader in weblogic.xml   To configure the Filtering Class Loader to specify a certain package is loaded from an application, add a prefer-application-packages descriptor element. 1276593.1 WLS - How to supress servlet/JSP version details In WebLogic HTTP response header The string "X-Powered-By: Servlet/2.4 JSP/2.0" is showing up in the servlet response header.How to stop Weblogic from including servlet/JSP version details in the x-powered-by HTTP response header. 1490080.1 WebLogic Server 12.1.1.0 in a Cluster Environment Throws NotSerializableException for CDI Applications at com.sun.jersey.server.impl.cdi.CDIExtension When running in clustered environment, server start-up is not clean when you have CDI applications deployed. 1268138.1 Sample TwoWay SSL implementation for JAX-WS Webservice!   In this sample provided the recipient checks for the initiator's public certificate. Note that the client certificate can be used for authentication. 1584779.1 Socket Leaks When Calling Web-Service Over SSL This is a known bug 16810786 1598617.1 Secure WebService call throwing CANNOT RESOLVE URL FOR PROTOCOL HTTP/HTTPS through web server(APACHE) plug-in.    1056121.1 How to Timeout Weblogic Webservice Client   How to timeout a WebService client with and without using Stubs. 1568638.1 When packaging Jersey JAX-RS libraries into webapp throws NoSuchMethodError()  When attempting to include custom Jersey implementation libraries in to web application in a OSB domain. 1118264.1 WLS 10.3: Intermittent XA error: XAResource.XAER_RMERR In WebLogic 10.3, a CMP EJB sometimes throws the exception.   1608951.1 How to get More Details About Error BEA-101215 Malformed Request. Request parsing failed Code: -1   Which was seen when accessing the application via loadbalancer?

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• Sitemap structure for network of subdomains

  - by HaCos

  I am working on a project that's a network of 2 domains (domain.gr & domain.com.cy) of subdomains similar to Hubpages [each user gets a profile under a different subdomain & there is a personal blog for that user as well] and I think there is something wrong with our sitemap submission. Sometimes it takes weeks in order a new profiles to get indexed. We make use of one Webmasters account in order to manage all network and we don't want to create different accounts for each subdomain since there are more than 1000 already. According to this post http://goo.gl/KjMCjN, I end up on a structure of 5 sitemaps with the following structure : 1st sitemap will be for indexing the others. 2nd sitemap for all users profile under the domain.gr 3nd sitemap for all users profile under the domain.com.cy 4th sitemap for all posts under the *.domain.gr - news sitemap http://goo.gl/8A8S9f 5th sitemap for all posts under the *.domain.com.cy - news sitemap again Now my questions: Should we create news sitemaps or just list all post in 2nd & 3rd sitemap? Does links ordering has anything to do? Eg: Most recent user created be first in sitemap or doesn't make any different and we just need to make sure that lastmod date is correct? Does anyone guess how Hubpages submit their sitemap in Webmasters so maybe we could follow there way? Any alternative or better way to index this kind of schema? PS: Our network is multi language - Greek & English are available. We make use of hreflang tags on the head of each page to separate country target of each version.

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• How can I hard reset a USB device?

  - by Cory

  I have a USB device (a modem) that is really finicky. Sometimes it works fine, but other times it refuses to connect. The only solution I have found to fix it once it gets into a bad state is to physically unplug the device and plug it back in. However, I don't always have physical access to the machine it is plugged in on, so I'm looking for a way to do this through the command line. This post suggests running: sudo modprobe -w -r usb_storage; sudo modprobe usb_storage However I get an "unknown option -w" output. This slightly modified command: sudo modprobe -r usb_storage Fails with the message FATAL: Module usb_storage is in use. If I try to kill -9 the processes marked [usb-storage] before running they refuse to die (I think because they are deeply tied to the kernel). Anyone know of a way to do this? NOTE: I cross-posted this on superuser.com as I didn't know which was more appropriate. I will delete and/or link whichever one is answered first.

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• How to improve Algorithmic Programming Solving skill? [closed]

  - by gaurav

  Possible Duplicate: How can I improve my problem-solving ability? How do you improve your problem solving skills? Should I learn design patterns or algorithms to improve my logical thinking skills? What to do when you're faced with a problem that you can't solve quickly? Are there non-programming related activities akin to solving programming problems? I am a computer engineering graduate. I have studied programming since three years. I am good in coding and programming. I have been trying to compete in algorithmic competitions on sites such as topcoder,spoj since one and a half year, but I am still unable to solve problems other than too easy problems. I have learned from people that it takes practice to solve such problems. I try to solve those problems but sometimes I am unable to understand and even if I do understand I am unable to think of a good algorithm for solving it. Even if I solve I get Wrong answer and I am unable to figure out what is the problem with my code as it works on samples given on the sites but fails on test cases which they do not provide. I really want to solve those problems and become good in algorithms. I have read books for learning algorithms like Introduction to algorithms by CLRS,practicing programming questions. I have gone through some questions but they don't answer this question. I have seen the questions which are said duplicates but those questions focus on overall programming, but I am asking for algorithm related programming, basically for competing in programming which involve solving a problem statement then online judge will automatically evaluate it, such type of programming is quite different from the type of programming these questions discuss.

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• SQL SERVER – Validating Unique Columnname Across Whole Database

  - by pinaldave

  I sometimes come across very strange requirements and often I do not receive a proper explanation of the same. Here is the one of those examples. Asker: “Our business requirement is when we add new column we want it unique across current database.” Pinal: “Why do you have such requirement?” Asker: “Do you know the solution?” Pinal: “Sure I can come up with the answer but it will help me to come up with an optimal answer if I know the business need.” Asker: “Thanks – what will be the answer in that case.” Pinal: “Honestly I am just curious about the reason why you need your column name to be unique across database.” (Silence) Pinal: “Alright – here is the answer – I guess you do not want to tell me reason.” Option 1: Check if Column Exists in Current Database IF EXISTS (  SELECT * FROM sys.columns WHERE Name = N'NameofColumn') BEGIN SELECT 'Column Exists' -- add other logic END ELSE BEGIN SELECT 'Column Does NOT Exists' -- add other logic END Option 2: Check if Column Exists in Current Database in Specific Table IF EXISTS (  SELECT * FROM sys.columns WHERE Name = N'NameofColumn' AND OBJECT_ID = OBJECT_ID(N'tableName')) BEGIN SELECT 'Column Exists' -- add other logic END ELSE BEGIN SELECT 'Column Does NOT Exists' -- add other logic END I guess user did not want to share the reason why he had a unique requirement of having column name unique across databases. Here is my question back to you – have you faced a similar situation ever where you needed unique column name across a database. If not, can you guess what could be the reason for this kind of requirement?  Additional Reference: SQL SERVER – Query to Find Column From All Tables of Database Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL System Table, SQL Tips and Tricks, T SQL, Technology

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