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• Technical Questions for Java Experts

  - by Tori Wieldt

  The "Oracle Technology Network" (meaning me) will be at Devoxx next week doing interviews with Java experts. Do you have technical questions about Project Jigsaw, JavaFX or Java on MacOS? Take a look at the list below of experts and topics. Leave your questions as a comment on this blog and I'll do my best to include them. Most of the interviews happen Tuesday, so get you questions in quickly. Thanks! Interviewee InterviewTopic Arun Gupta and Alexis Moussine-Pouchkine Java EE Mark Reinhold OpenJDK Mark Reinhold Project Jigsaw Jasper Potts JavaFX Scott Kovatch Java on Mac OS Brian Goetz & Mark Reinhold JDK 8 Brian Goetz Project Lambda Steven Chin JavaFX Marek Potociar JAX-RS Claude Falguiere Dev for Tablets Alan Bateman NIO2 Regina ten Bruggencate JDuchess Martijn Verburg Adopt a JSR Note: This is different than the call for questions for the Fireside chat on Tuesday afternoon, Devoxx conference keynote speakers (Henrik Ståhl, senior director of product management for the Java platform at Oracle, and Cameron Purdy, VP of development for the Java EE platform) and the technical discussion panel on Friday morning. Leave (and vote on) those questions here. 

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• Where does jQuery fit-in with frameworks like JavaScriptMVC, BackboneJS, SproutCore and Knockout?

  - by Prisoner ZERO

  I have been happily using JQuery for the last 2 years and have been quite sucessful creating some really cool functionality with it...so I am very comfortable with it. I also beleive the future of the web will continue on the current client-side path. However... The next challenge seems to be coming in the form of various controller frameworks: KnockoutJS, BackboneJS, SproutCore, JavaScriptMVC (the list goes on). Additonally, there are some great AMD Loader tools for use like RequireJS or LabJS etc. However, jQuery now has define and then capabilities baked-in. It's getting harder-and-harder to keep track of it all... And now, my task seems to be to evaluate/decide-on a strategic-direction for using some form of either an MVC or MVVM framework client-side...but I have so many questions. Where does JQuery fit-in with the various controller-frameworks mentioned above? Is JQuery used alongside each or do some of them have their own 'JQuery-styled version' baked-in? Are tools like RequireJS still needed if you implement one of the various controller-frameworks mentioned above? Does the define and then capabilities baked-into JQuery now supercede the AMD Loader mentioned above? Which one seems most modular? (see notes below) NOTES: One thing I don't want in any future-framework is the requirement of having to take-in vast amounts of functionality that I don't use. Meaning, I would rather use a framework that is truly modular. For example, to use jQuery UI you have to take-in a lot other core libraries that you might not actually use. I will be experimenting with each one, but some REAL feedback would be great. I've seen some 'similar' questions, but none have really answered the above skew. Thanks in advance!

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• Solutions for Project management [closed]

  - by user14416

  The team consists of 3 people. The method of development is Scrum. The language of the project is C++. The project will be under the control of the git system. The start up budget is 0. The following things have to be chosen: Build and Version Numbering Project documentation ( file with the most common info for current stage of the project, which will be changed every time the new version or subversion of the project emerges ) Project management tool ( like Trac or Redmine, I cannot use them, because there is no hosting ) Code documentation ( I consider Doxygen ) The following questions have arisen: What can you add to the above list of the main solutions for project management in the described project? One of three project participants has linux os (No MS Office), one has Windows and MS Office (does not want to use Libre or Open Office), one has Windows, but does not have MS Office. What formats, tools can u suggest using for project documentation? The variant of using online wiki does not fit, it must be files. OneNote mb is a good tool for project management, but because of the reason mentioned above it is not possible. What can you advise? Offer a system for Build and Version Numbering.

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• Impossible to boot Ubuntu on a USB stick (OS X Montain Lion)

  - by user109513

  I know this has been discussed over and over but I still cannot run Ubuntu on a USB stick. Here's the step I followed: 1. I downloaded Ubuntu 12.10 (ubuntu-12.10-desktop-i386.iso) from http://www.ubuntu.com/download/desktop which I renamed 'ubuntu.iso'. I bought my Mac mid-2010, it has an Intel processor. 2. I formated my 16GB USB stick with HFS+ File System following this tutorial: http://www.switchingtomac.com/tutorials/how-to-format-a-drive-or-partition-with-the-hfs-file-system 3. I opened a terminal and typed: hdiutil convert -format UDRW -o ~/Downloads/ubuntu.img ~/Downloads/ubuntu.iso It created ubuntu.iso.dmg 4. I ran 'diskutil list' and identified the device node assigned to the USB. 5. I unmounted it: diskutil unmountDisk /dev/disk2 6. Then, I entered the command: sudo dd if=~/Downloads/ubuntu.img.dmg of=/dev/rdisk2 bs=1m. It seemed to work. A Mac message poped up saying that the system doesn't recognized the disk, I pressed 'ignore'. 7. I ejected the USB using diskutil eject /dev/disk2, then removed the USB. 8. I rebooted the computer, plugged the USB key, pressed ALT.I could see my Macintosh partition and my Windows partition, but couldn't see my USB stick. Any help will be very appreciated :) Victor

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• Automatic Appointment Conflict Resolution

  - by Thomas

  I'm trying to figure out an algorithm for resolving appointment times. I currently have a naive algorithm that pushes down conflicting appointments repeatedly, until there are no more appointments. # The appointment list is always sorted on start time appointment_list = [ <Appointment: 10:00 -> 12:00>, <Appointment: 11:00 -> 12:30>, <Appointment: 13:00 -> 14:00>, <Appointment: 13:30 -> 14:30>, ] Constraints are that appointments: cannot be after 15:00 cannot be before 9:00 This is the naive algorithm for i, app in enumerate(appointment_list): for possible_conflict in appointment_list[i+1:]: if possible_conflict.start < app.end: difference = app.end - possible_conflict.start possible_conflict.end += difference possible_conflict.start += difference else: break This results in the following resolution, which obviously breaks those constraints, and the last appointment will have to be pushed to the following day. appointment_list = [ <Appointment: 10:00 -> 12:00>, <Appointment: 12:00 -> 13:30>, <Appointment: 13:30 -> 14:30>, <Appointment: 14:30 -> 15:30>, ] Obviously this is sub-optimal, It performs 3 appointment moves when the confict could have been resolved with one: if we were able to push the first appointment backwards, we could avoid moving all the subsequent appointments down. I'm thinking that there should be a sort of edit-distance approach that would calculate the least number of appointments that should be moved in order to resolve the scheduling conflict, but I can't get the a handle on the methodology. Should it be breadth-first or depth first solution search. When do I know if the solution is "good enough"?

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• Complimentary Refills

  - by onefloridacoder

  My son and I were out to dinner and right after we sat down, he combs the menu to locate the soda  selection.  Then he looks up at me and says “Looks like we get free refills here, sweet!”  While we were sitting there I was thinking where that statement came from and I remember one time where he was helping to figure out the tip and saw that were we charged for six sodas, but there were only four of us at the table.  I would say that’s when this started for eateries he’s not familiar with. I was talking a friend of mine this week and this thought came to me, why can’t we manage expectations like my son – find out before the order is placed.  Find out what’s expected first then use the other bits of guidance to move forward.  But how many times have we all paid way to much for something we thought was free on a project – me, plenty.  This quote is going up in my work space, next to one I picked up Corey Haines’ Software Craftsmanship talk at Open Agile Romania - “Work != Practice”.  So if anyone else has gotten burnt, maybe check the menu, it will be in the area where the customer will pick two from the list of “Price, Quality, or Speed”.  Refills will be listed just beneath that.

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• dell vostro 1000 broadcom wireless connection

  - by lorrenuy

  I have a problem with the hardware broadcom wifi. I press the hotkey fn+f2 to activate the hardware and this will not work. I'll look at the drivers but it appears to be installed. How can I solve this problem? Ubuntu is all new to me so if possible, give me a clear explanation. Now do I connect the lan cable. I use the Ubuntu 11.10 lawrence@lawrence-Vostro-1000:~$ sudo lshw -class network [sudo] password for lawrence: PCI (sysfs) *-network description: Network controller product: BCM4311 802.11b/g WLAN vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:05:00.0 version: 01 width: 32 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=b43-pci-bridge latency=0 resources: irq:18 memory:c0200000-c0203fff *-network description: Ethernet interface product: BCM4401-B0 100Base-TX vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:08:00.0 logical name: eth1 version: 02 serial: 00:1c:23:a2:b9:a9 size: 100Mbit/s capacity: 100Mbit/s width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=b44 driverversion=2.0 duplex=full ip=192.168.1.18 latency=64 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:21 memory:c0300000-c0301fff lawrence@lawrence-Vostro-1000:~$ lawrence@lawrence-Vostro-1000:~$ rfkill list all 0: dell-wifi: Wireless LAN Soft blocked: yes Hard blocked: yes

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• Sorting a Grid of Data in ASP.NET MVC

  Last week's article, Displaying a Grid of Data in ASP.NET MVC, showed, step-by-step, how to display a grid of data in an ASP.NET MVC application. Last week's article started with creating a new ASP.NET MVC application in Visual Studio, then added the Northwind database to the project and showed how to use Microsoft's Linq-to-SQL tool to access data from the database. The article then looked at creating a Controller and View for displaying a list of product information (the Model). This article builds on the demo application created in Displaying a Grid of Data in ASP.NET MVC, enhancing the grid to include bi-directional sorting. If you come from an ASP.NET WebForms background, you know that the GridView control makes implementing sorting as easy as ticking a checkbox. Unfortunately, implementing sorting in ASP.NET MVC involves a bit more work than simply checking a checkbox, but the quantity of work isn't significantly greater and with ASP.NET MVC we have more control over the grid and sorting interface's layout and markup, as well as the mechanism through which sorting is implemented. With the GridView control, sorting is handled through form postbacks with the sorting parameters - what column to sort by and whether to sort in ascending or descending order - being submitted as hidden form fields. In this article we'll use querystring parameters to indicate the sorting parameters, which means a particular sort order can be indexed by search engines, bookmarked, emailed to a colleague, and so on - things that are not possible with the GridView's built-in sorting capabilities. Like with its predecessor, this article offers step-by-step instructions and includes a complete, working demo available for download at the end of the article. Read on to learn more! Read More >

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• apt-get update very slow, stuck at "Waiting for headers"

  - by Liam

  I have looked at similar questions: Stuck at 0% [waiting for headers] (apt) apt-get update stuck on "Waiting for Headers" However neither one of them answer my problem. I am running 12.04 AMD64 and have recently started getting an issue that when I update my repos from my connection at home through a terminal, using sudo apt-get update, it takes forever (literally after 2 hours it was at 28%), however when I run from a different location it takes less than 5 minutes to complete. I have attempted changing which mirror I use but that does not solve the issue. I have also cut down what is in my sources list but this also makes no difference. There are no faults on my ADSL line as I have already contacted my ISP to check this. It also makes no difference if I use a WiFi or network cable connection. What could be my issue? A speed test (www.speedtest.net) comes out at about 0.9 Mbps down and 0.42 Mbps up (which is a shade under the advertised line speed), I reside in South Africa and use the UCT LEG server. But I have also tried the other mirrors available in SA....none of them make a difference.

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• Interesting SSMS issue with waittype of PREEMPTIVE_OS_LOOKUPACCOUNTSID

  - by steveh99999

  Saw a recent issue with SQL2008 sp 1 where SQL Server Management Studio (SSMS) appeared to hang when a DBA expanded the database users tab of a database… ie like this :-   When we looked at the waittype of the SSMS session - via sys.dm_os_waiting_tasks– it was waiting on PREEMPTIVE_OS_LOOKUPACCOUNTSID. I’d not come across this waittype before, and there was very little information out on the web for it.. Looking at this issue using SQL Profiler – it them became apparent that SSMS was waiting on the function SUSER_SNAME. I did a quick test using SET STATISTICS TIME to prove it was the SUSER_SNAME function causing our issue :- SELECT * FROM sys.database_principals   -- completes in 6 milliseconds SELECT SUSER_SNAME(sid),* FROM sys.database_principals  -- completes in 188941 milliseconds. suser_sname validates a sid against Active Directory.. What I haven’t mentioned so far is that the database in question had been restored from a server on a different domain. This domain was untrusted from the current domain. However, it appeared that SSMS was still trying to validate the Windows login of each user when displaying the users list…. and taking a long time to return NULL for each user from the untrusted domain. When all users that had a login from the untrusted domain are removed from the database – this fixed the issue. To find out the users that had this issue :- SELECT name FROM sys.database_principals WHERE type_desc IN(‘WINDOWS_USER’, ‘WINDOWS_GROUP’) and SUSER_SNAME(sid) IS NULL Although I have not raised this as a case with MS – I do think this is a bug in SSMS – I do not see why windows logins should need to be validated when displaying only user details..

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• Thread safe GUI programming

  - by James

  I have been programming Java with swing for a couple of years now, and always accepted that GUI interactions had to happen on the Event Dispatch Thread. I recently started to use GTK+ for C applications and was unsurprised to find that GUI interactions had to be called on gtk_main. Similarly, I looked at SWT to see in what ways it was different to Swing and to see if it was worth using, and again found the UI thread idea, and I am sure that these 3 are not the only toolkits to use this model. I was wondering if there is a reason for this design i.e. what is the reason for keeping UI modifications isolated to a single thread. I can see why some modifications may cause issues (like modifying a list while it is being drawn), but I do not see why these concerns pass on to the user of the API. Is there a limit imposed by an operating system? Is there a good reason these concerns are not 'hidden' (i.e. some form of synchronization that is invisible to the user)? Is there any (even purely conceptual) way of creating a thread safe graphics library, or is such a thing actually impossible? I found this http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness which seems to describe GTK differently to how I understood it (although my understanding was the same as many people's) How does this differ to other toolkits? Is it possible to implement this in Swing (as the EDT model does not actually prevent access from other threads, it just often leads to Exceptions)

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• Scalable Architecture for modern Web Development [on hold]

  - by Jhilke Dai

  I am doing research about Scalable architecture for Web Development, the research is solely to support Modern Web Development with flexible architecture which can scale up/down according to the needs without losing any core functionality. By Modern Web I mean to support all the Devices used to access websites, but the loading mechanism for all devices would be different. My quest of architecture is: For PC: Accessing web in PC is faster but it also depends on the Geo-location, so, the application would check by default the capacity of Internet/Browser and load the page according to it. For Mobile: Most of the mobile design these days either hide information or use different version of same application. eg: facebook uses m.facebook.com which is completely different than PC version. Hiding the things from Mobile using JavaScript or CSS is not a solution as it'll consume the bandwidth and make the application slow. So, my architecture research is about Serving one Application, which has different stack. When the application receives the request it'd send the Packaged Stack to the received request. This way the load time for end users would be faster and maintenance of application for developers would be easier. I am researching about for 4-tier(layered) architecture like: Presentation Layer Application Logic Layer -- The main Logic layer which stores the Presentation Stack Business Logic Layer Data Layer Main Question: Have you come across of similar architecture? If so, then can you list the links here, I'm very much interested to learn about those implementations specially in real world scenario. Have you thought about similar architectures and tried your own ideas, or if you have any ideas regarding this, then I urge to share. I am open to any discussions regarding this, so, please feel free to comment/answer.

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• The Likability of Angry Birds [Infographic]

  - by ETC

  Any player of the oddly addictive physics game Angry Birds can attest to the range of likability among the bird munitions you are supplied with. This infographic from The Oatmeal puts the love and loathing on a scale. If you’re in need of any Angry Birds graphics, hit up the link below. The Oatmeal released the Angry Birds graphics they created for public consumption, available for both commercial and non-commercial use at the link below. The Likability of Angry Birds [The Oatmeal] Latest Features How-To Geek ETC Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 DriveSafe.ly Reads Your Text Messages Aloud The Likability of Angry Birds [Infographic] Dim an Overly Bright Alarm Clock with a Binder Divider Preliminary List of Keyboard Shortcuts for Unity Now Available Bring a Touch of the Wild West to Your Desktop with the Rango Theme for Windows 7 Manage Your Favorite Social Accounts in Chrome and Iron with Seesmic

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• call function between classes [closed]

  - by aziz joh

  hello I have 3 classes class A, B, and C class A is the main class and content the main function also, i call class B and class C in the main as b1,b2 and c1. in class B there is a vector (V) has list of int. and 3 functions Add, get and delete delete. all the thing in the class is public. in class C i have function that need to (B::get) from b. what I want is that how I can make c1 call get of b1 to return the value of the V in b1 after that use add of b2 to add new item in V of b2. Thanks in advance This is an example class a{ int main(){ b b1,b2; c c1; b1.add(10); b1.add(20); c1.start(); }} class b{ vector<int> v; void add(int i){ v.push_back(i)} int get(){int i=v.at(0); return i;} } class c{// take something from b1 and add it to b2 void play(){ int i=b.get();//should take it from b1 b.add(i*2);//should add it to b2 }} please I need your help I been searching to solve this problem for days.

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• Unity not running on startup

  - by Dan

  OK, so Firefox was running extremely slow, I ran it in safe mode and still slow, so I rebooted and when she came back on, I wasn't at the regular Unity login, it was like a classic Windows login (where I had to enter my username and password manually, not a list of users). I logged in and only my desktop was visible (with icons and my wallpaper). Nothing else. I was able to open a terminal with Ctrl+ Alt+T and typed... sudo unity ...which got it up (albeit with the default icons on the launcher ex. I had unlocked Libre Office and it was back). In "Startup Applications..." there was absolutely nothing at all... This happens every time I reboot. Thunderbird de-synced from my Gmail but Pidgin is still connected. When I do Ctrl+Alt+L it locks the screen as normal, but I have no option to switch user. I have the only account on this computer but I cannot access the main login screen to get to my Guest account. I'm not very Ubuntu-savy, but it's pretty clear that I'm starting in some sort of safemode. I am on a fresh install of Ubuntu 12.04.1 LTS (just installed it last night).

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• Why isn't there a culture of paying for frameworks?

  - by Marty Pitt

  One of the side effects of the recent trend of "Lean" startups, and the app store era, is that consumers are more acclimatised to paying small prices for small games / products. Eg.: Online SAAS that charges ~$5 / month (the basecamp style of product) Games which are short, fun, and cheap ($0.99 from the app store This market has been defined by "doing one thing well, and charging people for it." DHH of Rails / 37 Signals fame argues that if your website isn't going to make money, don't bother making it. Why doesn't the same rule apply to frameworks? There are lots of software framework projects out there - many which are mature and feature-rich, which offer developers significant value, yet there doesn't seem to be a market or culture of paying for these. It seems that the projects which do charge money are often things like UI component toolsets, and are often marginalized in favour of free alternatives. Why is this? Surely programmers / businesses see the value in contributing back to projects such as Ruby, Rails, Hibernate, Spring, Ant, Groovy, Gradle, (the list goes on). I'm not suggesting that these frameworks should start charging for anyone who wants to use them, but that there must be a meaningful business model that would allow the developers to earn money from the time they invest developing the framework. Any thoughts as to why this model hasn't emerged / succeeded?

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• Linear Search in Python? [closed]

  - by POTUS

  def find_interval(mesh,x): '''This function finds the interval containing x according to the following rules, mesh is an ordered list with n numbers return 0 if x < mesh[0] return n if mesh[n-1] < x return k if mesh[k-1] <= x < mesh[k] return n-1 if mesh[n-2] <= x <= mesh[n-1] This function does a Linear search. 08/29/2012 ''' for n in range(len(mesh)): for k in range(len(mesh)): if x == mesh[n]: print "Found x at index:" return n elif x<mesh[n]: return 0 elif mesh[n-1]<x: return n elif mesh[n-2]<=x<=mesh[n-1]: return n-1 elif mesh[k-1]<=x<mesh[k]: return k mesh = [0, 0.1, 0.25, 0.5, 0.6, 0.75, 0.9, 1] print mesh print find_interval(mesh, -1) print find_interval(mesh, 0) print find_interval(mesh, 0.1) print find_interval(mesh, 0.8) print find_interval(mesh, 0.9) print find_interval(mesh, 1) print find_interval(mesh, 1.01) Output: [0, 0.100000000000000, 0.250000000000000, 0.500000000000000, 0.600000000000000, 0.750000000000000, 0.900000000000000, 1] 0 Found x at index: 0 2 6 -1 -1 0 I don't think the output is correct. Can anyone help me fix it? Thanks.

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• Android&ndash;Finding your SDK debug certificate MD5 fingerprint using Keytool

  - by Bill Osuch

  I recently upgraded to a new development machine, which means the certificate used to sign my applications during debug changed. Under most circumstances you’ll never notice a difference, but if you’re developing apps using Google’s Maps API you’ll find that your old API key no longer works with the new certificate fingerprint. Google's instructions walk you through retrieving the MD5 fingerprint of your SDK debug certificate - the certificate that you’re probably signing your apps with before publishing, but it doesn't talk much about the Keytool command. The thing to remember is that Keytool is part of Java, not the Android SDK, so you'll never find it searching through your Android and Eclipse directories. Mine is located in C:\Program Files\Java\jdk1.7.0_02\bin so you should find yours somewhere similar. From a command prompt, navigate to this directory and type: keytool -v -list -keystore "C:/Documents and Settings/<user name>/.android/debug.keystore" That’s assuming the path to your debug certificate is in the typical location. If this doesn’t work, you can find out where it’s located in Eclipse by clicking Window –> Preferences –> Android –> Build. There's no need to use the additional commands shown on Google's page. You'll be prompted for a password, just hit enter. The last line shown, Certificate fingerprint, is the key you'll give Google to generate your new Maps API key. Technorati Tags: Android Mapping

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• Strange robots.txt - how and why did it get there?

  - by Mick

  I recently created a very simple, pure HTML website which I have hosted with "hostmonster". Hostmonster had very good reviews on some comparison website and in general so far they appear to be perfectly good in every way... At least I thought so until just now... I have been making lots of edits to my site on an almost daily basis. My site now appears on the first page (7th on the list) for my most important keyphrase when doing a google search. But I did notice some problem with the snippet chosen by google. I asked a question on this site about snippets and got some great answers. I then made some modifications to my meta data and within 48hrs the google snippet for my search was perfect. The odd thing though was that looking at the "cached" version google had, it appeared that the cache was still very odl- like three weeks previous. This seemed very odd - how could it be that the google robots had read my new metadata without updating the cache? This puzzled me greatly. Just now it occurred to me that maybe I had some goofey setting in my robots.txt file. I didn't actually remember even making one - but I thought I'd have a look just in case. Much to my horror, I saw that there was a robots.txt and it contained the disturbing text below: sitemap: http://cdn.attracta.com/sitemap/728687.xml.gz Intuitively this looks like some kind of junk, spam trick, and I had indeed been getting some spam from "attracta". So my questions are: 1. Should I simply delete this robots.txt? 2. Was the file there all along - placed there because of some commercial tie-in between attracta and hostmonster. 3. Does the attracta robots file explain the lack of re-caching?

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• Unable to mount external hard drive - Damaged file system and MFT

  - by Khalifa Abbas Lame

  I get the following error when i try to mount my external hard drive. UNABLE TO MOUNT Error mounting /dev/sdc1 at /media/khalibloo/Khalibloo2: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sdc1" "/media/khalibloo/Khalibloo2"' exited with non-zero exit status 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read of MFT, mft=6 count=1 br=-1: Input/output error Failed to open inode FILE_Bitmap: Input/output error Failed to mount '/dev/sdc1': Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f parameter is very important! If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation for more details. It doesn't mount on windows either: "I/O Device error" it's an ntfs hard drive with a single partition Of course, i tried chkdsk /f. it reported several file segments as unreadable, but didn't say whether it fixed them or not (apparently not). also tried with the /b flag. ntfsfix reported the volume as corrupt. TestDisk was able to fix a small error with the partition table by adding the "80" flag for the active (only) partition. TestDisk also confirmed that the boot sector was fine and it matched the backup. However, when attempting to repair the MFT, it couldn't read the MFT. It also couldn't list the files on the hard drive. It says file system may be damaged. Active@ also shows that MFT is missing or corrupt. So how do i fix the file system? or the MFT?

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• How to make a btrfs snapshot?

  - by MountainX

  My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular. I am aware that there are similar questions, but each similar question seems to be asking something different from what I'm asking (and they are older, which means probably outdated, given the rapid development of btrfs). For example, the answer to this question is apparently not the answer to my question because my /home partition is a separate volume and the man page for btrfs shows a different command for creating snapshots now. another similar problem, no solid solution. someone else as confused as me on the naming issues My question: Starting simple: is this the correct command to take a simple snapshot of my home partition? btrfs subvolume snapshot /home/@home /home/@home_snapshot_20120421 I got really brave and tested it and it does not work. The error is error accessing /home/@home. As shown below, @home is listed. I'm obviously confused on subvolume names. Do I need to use them in creating snapshots? Some examples show taking snapshots of home using /home as the source parameter, but based on examples of root volumes, it seems to me that I need to use /home/@home. Would this command work? And if not, why? btrfs subvolume snapshot /home /home/@home_snapshot_20120421 Is the @ just a naming convention? Is it meaningful at all? Here's some output that may be relevant: btrfs subvolume list /home ID 256 top level 5 path @home I'm not sure what that means, exactly. When I try btrfs device scan it gives an error (e.g. unable to scan the device /dev/sda1). My file system doesn't have any errors. Everything is fine.

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• Dell Laptop's Bluetooth isn't detected by Ubuntu

  - by vishwaje

  I have Dell vostro 3500 Laptop. I Installed Ubuntu 12.04. It doesn't detect my bluetooth. below is my information. lsusb | grep Bluetooth Bus 001 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth) lsmod | grep bluetooth bluetooth 158438 10 bnep,rfcomm rfkill list 0: brcmwl-0: Wireless LAN Soft blocked: yes Hard blocked: no 1: dell-wifi: Wireless LAN Soft blocked: yes Hard blocked: no (wifi working fine. I disabled it using network menu. So, it's fine) dmesg | grep Bluetooth [ 21.981835] Bluetooth: Core ver 2.16 [ 21.981872] Bluetooth: HCI device and connection manager initialized [ 21.981877] Bluetooth: HCI socket layer initialized [ 21.981881] Bluetooth: L2CAP socket layer initialized [ 21.981891] Bluetooth: SCO socket layer initialized [ 21.986047] Bluetooth: RFCOMM TTY layer initialized [ 21.986059] Bluetooth: RFCOMM socket layer initialized [ 21.986065] Bluetooth: RFCOMM ver 1.11 [ 22.361783] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 22.361791] Bluetooth: BNEP filters: protocol multicast So How can I fix this? I saw other place (I don't remember which site) They said, some times, when in windows, if bluetooth disabled by windows driver, It can't be enabled by linux. So, I should install windows and enable blueethooth from windows and then re install linux. That is impossible for me, because I don't have Windows installation media. But I tried this, which is I installed windows xp on virtual box. Vbox showed me thow unknow USB devices. I connected them and installed windows bluethooth drivers to xp. But it didn't ditected Bluethooth either. Also, when I set off mode in hardware switch, those unknown devices disappear from Vbox usb device seletcion menu. So, they are definitely something to do with wifi or bluethooth. Please help me..

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• Camera Collision inside the room model

  - by sanddy

  I am having a problem in Calculating the camera collision for my Room model which consists of sofa, tables and other models. The users shall be moving the camera front, back, rotating so i need to make sure that the camera does not collide with any of the models with in the room. I have treated all my models inside the room by BoundingBox[] and the camera by BoundingSphere. So, far i have implemented collision by looking into the tutorial from http://www.toymaker.info/Games/XNA/html/xna_model_collisions.html which was great. But, I guess the problem lies in the Transformation part. I debugged and found some points to be at Vector(-XXX,-XXX,-XXX) where X is digit. Also i found my radius of some models where too large(in thousand, i just looked into its radius value before converting to BoundingBox). Do I need to scale the model for collision??? Below are my code:- On My LoadContent(): Matrix[] transforms = new Matrix[myModel.Bones.Count]; myModel.CopyAbsoluteBoneTransformsTo(transforms); int index = 0; box = new List<BoundingBox>(); BoundingBox worldModel = Utility.CalculateBoundingBox(myModel); foreach (ModelMesh mesh in myModel.Meshes) { Vector3[] obb = new Vector3[8]; worldModel.GetCorners(obb); Vector3[] asdf = (Vector3[])obb.Clone(); Vector3.Transform(obb, ref transforms[mesh.ParentBone.Index], obb); BoundingBox worldBox = BoundingBox.CreateFromPoints(obb); box.Add(worldBox); index++; } On CameraPosition Update: BoundingSphere bs = new BoundingSphere(this.cameraPos, 5.0f); if (RoomWalkthrough.Utility.CheckCollision(bs, bb)) { // Do Something } Please Help.

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• Z-order with Alpha blending in a 3D world

  - by user41765

  I'm working on a game in a 3D world with 2D sprites only (like Don't Starve game). (OpenGL ES2 with C++) Currently, I'm ordering elements back to front before drawing them without batch (so 1 element = 1 drawcall). I would like to implement batching in my framework to decrease draw calls. Here is what I've got for the moment: Order all elements of my scene back to front. Send order list of elements to the Renderer. Renderer look in his batch manager if a batch exist for the given element with his Material. Batch didn't exist: create a new one. Batch exist for element with this Material: Add sprite to the batch. Compute big mesh with all sprite for each batch (1 material type = 1 batch). When all batches are ok, the batch manager compute draw commands for the renderer. Renderer process draw commands (bind shader, bind textures, bind buffers, draw element) Image with my problem here: Explication here But I've got some problems because objects can be behind another objects inside another batch. How can I do something like that? Thanks!

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• Configuring log4j on weblogic server for web applications.

  - by adejuanc

  To configure Weblogic server : 1.- Read the following link : How to Use Log4j with WebLogic Logging Services http://download.oracle.com/docs/cd/E12840_01/wls/docs103/logging/config_logs.html#wp1014610 Here the step by step : 2.- Go to WL_HOME/server/lib and copy wllog4j.jar to the server CLASSPATH, to do this copy the file into DOMAIN_NAME/lib 3.- Download log4j jar (in my case I had not the file) from http://logging.apache.org/log4j/1.2/download.html , in this case the last available version is log4j-1.2.17.jar, and copy the file into DOMAIN_NAME/lib (As step 2). 4.- In this case I activate log4j using WLST (Weblogic Scripting Tool), as bellow : 4.1 .- As you're using windows, execute a terminal window and go to DOMAIN_NAME/bin and run the file setDomainEnv.cmd (this file will set the environment to run java). 4.2 .- Execute the following comands : C:\>java weblogic.WLST wls:/offline> connect('username','password') wls:/mydomain/serverConfig> edit() wls:/mydomain/edit> startEdit() wls:/mydomain/edit !> cd("Servers/$YOUR_SERVER_NAME/Log/$YOUR_SERVER_NAME" wls:/mydomain/edit/Servers/myserver/Log/myserver !> cmo.setLog4jLoggingEnabled(true) wls:/mydomain/edit/Servers/myserver/Log/myserver !> save() wls:/mydomain/edit/Servers/myserver/Log/myserver !> activate() you can use ls() to list the objects under the WLS directory this will activate log4j to use it with WLS. Configuring WebLogic Logging Services http://download.oracle.com/docs/cd/E12840_01/wls/docs103/logging/config_logs.html To configure applications : 1. Create a log4j.properties file as bellow log4j.debug=TRUE log4j.rootLogger=INFO, R log4j.appender.R=org.apache.log4j.RollingFileAppender log4j.appender.R.File=/home/server.log log4j.appender.R.MaxFileSize=100KB log4j.appender.R.MaxBackupIndex=5 log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSSS} %p %t %c – %m%n 2. Copy the file to /WEB-INF/classes directory. of your application. 3.- implement also the last action provided to activate log4j on WLS

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