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• How to get familiar with "what happens underneath of Java"?

  - by FidEliO

  I did not study CS nor IT. I just became a developer, now working with Java. Actually, since I now work with a big company writing high-scalable web applications, I think I need to be better with details. I have no understanding of what happens underneath of Java. Java Performance, Server-Side Java might be the buzz words?!! I am very poor with those more of low-level details but I do not know where to look honestly. I started looking for some keywords in Amazon, ended up reading books like "pragmatic programmer", "clean code", "code complete" which IMO they are not what I am looking for. Could you please give me some learning resources (books, articles, blog posts, online trainings) for this matter? I also read this post as well: Approaching Java/JVM internals But I think I need a pre-step before jumping into the OpenJDK, right?!

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• IP fail-over address. Do i need it?

  - by Jon

  I received an email from my web hosting provider where i have 2 dedicated servers saying that from now on I have to pay for my IP fail-over addresses. The server we have hosts a tool used internally by our company. Traffic to it is quite low. No more than 3 people will use it at the same time. If something happens we can wait a day to have the tool up and running again. Is it worth having these fail-over addresses? thanks

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• Ubuntu 11.04 seem's like a laggy OS

  - by user772401

  I'm new to Linux/Ubuntu in general. I just dual booted the Ubuntu 11.04 w/Windows 7 on my Lenovo laptop - Intel i7 Quad Core 2Ghz, 4Gb ram, etc. etc... and for some reason Ubuntu is very laggy and slow. When I'm switching between programs (Chromium, folders, software center, etc..) it doesn't run as smooth as windows 7 (I have no more than 3 programs/windows up at a time...). I don't think it's my system requirements bkz Linux OSs are known to use low system resources. Could be a bad install or do people find it slow and laggy in general or is it my PC mfg type?? I installed it using Wubi - should I do a reinstall? I've already done all the recommended updates..

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• M-Audio Delta 1010LT on 12.04

  - by user74039

  I have 12.04 64bit installed, my soundcard is a Delta 1010LT, it seems to be partially detected, I've been following steps here: https://help.ubuntu.com/community/SoundTroubleshooting/ lspci -v | grep -A7 -i "audio" shows this: 04:07.0 Multimedia audio controller: VIA Technologies Inc. ICE1712 [Envy24] PCI Multi-Channel I/O Controller (rev 02) Subsystem: VIA Technologies Inc. M-Audio Delta 1010LT Flags: bus master, medium devsel, latency 64, IRQ 22 I/O ports at ec00 [size=32] I/O ports at e880 [size=16] I/O ports at e800 [size=16] I/O ports at e480 [size=64] Capabilities: <access denied> Kernel driver in use: snd_ice1712 aplay shows this: **** List of PLAYBACK Hardware Devices **** card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 In the sound settings on the desktop all I see is the ICE1712 S/PDIF, which I don't use, I want to use the individual outputs on the card, I'm not so bothered about inputs, I just want the playback for now. If I open alsamixer in the console, I see all of the output and input channels, i've raised the volume on them but I don't get anything in the sound settings on the desktop and when I play any sound, I hear nothing. Can someone help?

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• Can I share files via SAMBA while in root?

  - by user212501

  I have a couple of things going on here. I am currently running UBUNTU 10.04 in root via "STARTX" command. The reason being is that I keep getting the "LOW GRAPHICS ERROR CODE" and I cant not start up normally. Now I have researched & researched the error. I mean I got my SUDO on........, o.k. I'm really done trying to fix this error. I just wanna re-install. (funny thing. This startx command is how Im using the laptop now, so I know that it is a software issue) So here's my dilemma that is inside another dilemma. I have about 30gigs of info that I need to get off the laptop before I can re-install. Any thoughts What say you? LOTR LOL

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• 3G dongle and memory card detection

  - by user212632

  My questions is about 3G dongle (Huawei E1752) that I use for my internet on Ubuntu 12.04. The big issue is that ubuntu only recognise the dongle if I plug it in before booting up. But if somehow I loses connection (due to network being low) then the only way to use the 3G dongle again is to reboot my machine, which becomes a pain. I have the same issue with the memory card reader of my laptop whereby it only reads when I insert the card before booting up. My laptop is an Acer V3 -571g. At first I thought it was an issue that the model was quite new, but I have been updating my ubuntu for a while, and this issue has kept being the same

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• Choosing the correct network protocol for my type of game (its Wc3 Warlock style)

  - by Moritz

  I need to code a little game for a school project. The type of the game is like the Warcraft 3 map "Warlock", if anyone doesnt know it, here is a short description: up to ten players spawn into an arena filled with lava, the goal of each player is to push the other players into the lava with spells (basically variations of missiles, aoe nukes, moba spells etc) http://www.youtube.com/watch?v=c3PoO-gcJik&feature=related we need to provide multiplayer-support over the internet, for that reason I am looking for the best network protocol for this type of game (udp, tcp, lock step, client-server...) what the requirements are: - same/stable simulation on all clients - up to ten players - up to ~100 missiles on the field - very low latency since its reaction based (i dont know the method wc3 used, but it was playable with the old servers) what would be nice (if even possible, since the traffic might be too big): - support for soft bodies over the network (with bullet physics), but this is no real requirement I read several articles about the lock step method used for RTS games, this seems to be great, but does it fit for real-time action games too (ping-related)? If anyone has run into the same problems/questions like me, I would be very happy about any help

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• Is C++ really a bad language for beginners? [duplicate]

  - by Chris

  This question already has an answer here: Is C++ suitable as a first language? 24 answers I'm learning C++ right now, and it's the first language I'm learning. I keep seeing on stackexchange and other forums (Reddit, etc.) that I should drop C++ and learn a higher level language like Python or Java. The only arguments I see are that "C++ is harder to learn and is more low-level than others." which don't really give a reason NOT to learn it. I want to know if there are any actual reasons for dropping C++ and taking up another, "easier" language. Or if I should keep focusing on it, and just learn others later (which is what I plan on doing).

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• Is the Windows Start button an example of poor mapping? [migrated]

  - by user336359

  In my recent course on HCI, I've been told that start button on Windows systems is an example of poor mapping. The reason for that, as explained in materials, is that it doesn't start anything, but rather reveals a menu. I think that this is only valid if you approaching this from low level of abstraction (meaning that the button must start something). If you on the other hand take a view on this from higher level of abstraction, as of "Place where I start most of my tasks", i.e. This is the place where you are start*ing the task of switching off your computer This is the place where you are start*ing the task of searching for something on your computer This is the place where you are start*ing the task of running a program This is the place where you are start*ing the task ... Then I think it makes perfect sense and has perfect mapping. Is this a sensible interpretation?

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• Exalytics at Partners in EMEA

  - by Mike.Hallett(at)Oracle-BI&EPM

  Many partners have got Oracle Exalytics systems on their premises where they can help customers with proof-of-solution demonstrations to show how fast this engineered in-memory analytics solution can be, and how this translates into tangible business benefits.  Any customer with Oracle Analytics (OBIEE, Essbase, Hyperion Planning, Oracle BI-Applications) who is seeking to upgrade their hardware infrastructure, looking for a quick, low risk and cost effective implementation, should contact one of these to test what an Exalytics can do for them. Below is a list of some of our specialist Oracle Partners who have an Exalytics: http://www.arrowecs.fr/produits/index.php?id=82 France http://www.ise-informatik.de/ Germany http://www.hotitem.nl/ Netherlands http://bi.fors.ru/ Russia http://www.synchrotech-group.com/ Switzerland http://www.linkplus.com.tr/ Turkey http://www.rittmanmead.com/ UK

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• What makes C so popular in the age of OOP?

  - by GradGuy

  I code a lot both in C and C++ but did not expect C to be the second popular language, slightly behind Java! http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html I'm curious as why, in this age of OOP, C is still all that popular? Note that 4 out of top 5 popular languages are all "modern" object-oriented capable languages. Now I agree that you can do OOP in C to some extend, but that's sort of painful and not quite elegant! (well at least compared to C++ I guess) So what makes C this popular? efficiency? being low-level? or the vast majority of libraries that already exist? ... or something else?

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• how to get accepted at a big company like google [on hold]

  - by prof

  I'm 18 Years old; I started teaching myself programming when I was twelve. I've developed many projects in PHP, Javascript, Ruby, Ruby on Rails. I know a very little about C, C++, Objective C and extending PHP with extensions created in C Programming Language. Now I'm working as a freelance Web Developer with a very low salary :(, My Dream is to get a good career with very high salary so I thought of Big Companies like Google Or Microsoft. My Question is How to get Accepted on those big Companies ? What Pre-requests they want And do you need to finish collage education ?

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• Writing Resumes for Internships?

  - by ProdigySim

  I'm an undergraduate student starting to look for internships. I understand a lot about how to embellish a real-world resume--emphasizing tasks done at previous jobs and whatnot--but I'm not sure if it will translate well to low-experience internship resumes. Internship Resumes are marked by: Few to no past Software-related full-time jobs or internships Few to no non-school-involved Software-related activities Obviously if you have no experience or activities to list, you're pretty well stuck. So let's assume we have one of each. I'm basically wondering: What is a company looking for most from Intern candidates? Past work, GPA/coursework, Outside projects (Open Source, etc), certain skill sets (languages) Should I be emphasizing tasks, or jobs/positions when listing my experiences? Are skills important to list? If so, which ones in particular?

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• How to select which account is logged in at system startup, or none?

  - by hippietrail

  I'm helping out some friends with a tiny hospitality business where one desktop computer has some files used by the business in one account "hotel" but it's mostly used by guests for browsing the web in another account "guest". It's low security, we're not worried about hacking or anything. But we don't want people accidentally moving our files or anything either. But the system always boots into the "hotel" account without asking for a password, even though the account has a password. We want it to boot into the "guest" account. I know a bit about computers generally and Linux but not much about Ubuntu and the ever-changing graphical environment the Linuxes are going through these days. We've looked through the obvious settings/preferences/options and I've done some Googling. I know this should be obvious easy stuff but I can't find it. (We're running 10.04 LTS on a generic aging Intel box.)

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• Enable 'mod_rewrite' Using .htaccess File On cPanel Shared Hosting Server

  - by zulhfreelancer

  I'm using cPanel to host my website. I need to enable 'mod_rewrite' on this Shared Hosting cPanel account to run my script. I've tried to Google the solutions high and low but did not find any luck yet. Those tutorials that I found only work well with VPS and some of them said that, only hosting provider can change and enable it. But, some of them said that, it can be done easily by editing the .htaccess file. My question: If I want to edit the .htaccess file, what should I include in that file? What the 'rules' and 'conditions' that should be included?

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• How do I turn off nVidia high performance mode?

  - by gpen06

  I am new to Ubuntu 11.10 and never touched linux until today. I installed Ubuntu alongside with Windows 7. I have an issue with my laptop overheating and freezing when it uses the high performance GPU graphics mode (hybrid card). It is an easy fix for Windows 7. I simply set the graphics mode manually to the low performance integrated graphics (save power) mode using advanced power settings. In Ubuntu, I'm stumped at how to do this. When using Ubuntu, my laptop is showing the same symptoms as it did without the fix for Windows. I have the nVidia graphics driver installed for Windows which allows me to see which mode I am in. I downloaded it off of my laptop's website (ASUS). They do not offer driver downloads for linux. Screenshot of power settings in Windows 7

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• I have problem on 12.10 64bit with nvidia graphics driver opensource and proprietary ! Can't change resolution on 3d games

  - by digitalcrow

  I have problem with nvidia graphics driver opensource and proprietary ! Can't change resolution on 3d games and there's a bug there are no kernel sources installed and thus jockey can't install proprietary drivers. I can't change resolution while on games fullscreen. I tried to install proprietary driver and i couldn't plus i couldn't login to ubuntu it showed only the desktop photo no dash no nothing. -tried to install kernel sources and blacklist+remove Nouveau drivers and then installed the proprietary drivers i hope succesfully. -The problem is the same i can't change resolution on 3d games while on fullscreen. I've installed the sources and be able to install the proprietary nvidia drivers but the problem remains, look what i got in the output of a 3d game exited while i tried to change resolution: X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 150 (XFree86-VidModeExtension) Minor opcode of failed request: 10 (XF86VidModeSwitchToMode) Value in failed request: 0x25b Serial number of failed request: 497 Current serial number in output stream: 499 I'm giving you more details about my system: i have an nvidia geforce gts 250 , 3,4 ghz quadcore amd phenom2 , 8gbytes of ram. The output of: sudo lshw -C display; lsb_release -a; uname -a Is the following: *-display description: VGA compatible controller product: G92 [GeForce GTS 250] vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a2 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nvidia latency=0 resources: irq:18 memory:fa000000-faffffff memory:d0000000-dfffffff memory:f8000000-f9ffffff ioport:ef00(size=128) memory:fb000000-fb01ffff No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.10 Release: 12.10 Codename: quantal Linux darkpc 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux I like ubuntu's style and user interface but i hate the bad quality of work they do.

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• Neverwinter Nights does not run in 12.10

  - by 0x0me

  I recently installed a fresh version of Ubuntu 12.10 on my notebook. Then I copied the backup copy of my nwn folder from my old 12.04 install on the same computer to the new installation and tried to start the game. The terminal prompt disappears and top shows some low activity on nwmain, but there is neither showing up the game graphics nor plays any music. Any suggestions how to fix it? The game runs fine using the same setup expect for running on 12.04. Kind regards and thanks in advance

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• how to remove an item from my context menu?

  - by mongoose_za

  I installed a program called Aptana Studio 3. It's added a menu item to my context menu(if I right click I see an option "Aptana Studio"). How can I manually remove this from my menu? I have searched high and low and can't find a way to remove the Aptana stuff from my Firefox. Perhaps it's because I'm on Firefox 4. What I have done is I've gone into about:config I then searched for Aptana and there are 3 items that are listed. I've attached a screenshot. My question now is how can I remove these items because perhaps this will remove the option from my menu.

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• Will 3D games run in a VirtualBox4-hosted Windows system under Ubuntu with Intel GMA X4500HD card?

  - by Ivan

  I've just got a laptop with Intel GMA X4500HD card (which is said to be DirectX10-compliant, while my previous laptop had Intel 82852/855GM and no chance to play modern 3D games at all). It would be nice if I could play some games (like HalfLife 2, StarCraft 2, Fallout 3) from time to time (while I am ok using lo-fi settings and having low performance) but as I strongly prefer Ubuntu environment and don't need Windows usually I'd like to install Windows inside VirtualBox instead of using a dedicated partition and dual-boot. So the question is if VirtualBox can use 3D acceleration of Intel GMA X4500HD if run on Ubuntu.

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• Silverlight 3.0 and ADO.NET data service framework(An error occurred while processing this request)

  - by ybbest

  Today , I try to write a Silverlight app that talks to SharePoint 2010 using the REST API.However after deploy the silverlight app and run the code , I got the following error.In order to fix this I need to make the target framework of your caller application to 4.0,in this case I need to use Silverlight 4.0 instead 3.0.After I have done that and redeploy the solution to the SharePoint.It works like a charm.   Exceptions details: System.Data.Services.Client.DataServiceQueryException: An error occurred while processing this request. Request version ’1.0′ is too low for the response. The lowest supported version is ’2.0′. However , if you got the error like this: Could not load type ‘System.Data.Services.Providers.IDataServiceUpdateProvider’ from assembly ‘System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′,then you need to install ADO.NET Data Services Update for .NET Framework 3.5 SP1 ,you can download here (for windowns 7 and server 2008 r2 ) or here (for windows vista of server 2008).

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• Audio not working in 12.10

  - by frampy

  I did a clean install of 12.10, when I open Sound Settings in gnome the only device in the list is "Dummy Output", and sound is not working. Sound worked fine out of the box in 12.04 I ran alsamixer, it says my card is "HDA Intel", and chip is "Realtek ALC880". The alsamixer playback output was set to mute at first, unmuting did not fix. I checked out the info at http://www.unixmen.com/2012003-howto-resolve-nosound-problem-on-ubuntu/ as suggested on a similar question, I've done everything there except installing the ubuntu audio dev team driver. Should I try install this? Edit: I've been reading the sound troubleshooting guide at https://help.ubuntu.com/community/SoundTroubleshooting It looks like Ubuntu is finding my audio device correctly. mike@wucade:~$ lspci -v | grep -A7 -i "audio" 00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03) Subsystem: Albatron Corp. Device 2668 Flags: bus master, fast devsel, latency 0, IRQ 40 Memory at d01c0000 (64-bit, non-prefetchable) [size=16K] Capabilities: Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel Still stuck as to why this isn't working.

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• Choosing a new programming language to learn [on hold]

  - by Xelom

  I'm a Microsoft Stack(ASP.NET, C#) developer. Mainly, I develop server side software, windows services, restful apis etc. My client side interaction is really really low. So aside from C# I want to learn a new language. Time is precious and I want to give my focus to a language which have a future. My language list is: Scala (Powerful usage in Twitter) Go (Getting popular and channels are pretty awesome) Erlang (Stable server side programs. Used at Whatsapp) You can give advice for the above or you can give me a better option. My only exception is Objective-C. I don't want to get in that one. Thanks

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• Should we design programs to randomly kill themselves?

  - by jimbojw

  In a nutshell, should we design death into our programs, processes, and threads at a low level, for the good of the overall system? Failures happen. Processes die. We plan for disaster and occasionally recover from it. But we rarely design and implement unpredictable program death. We hope that our services' uptimes are as long as we care to keep them running. A macro-example of this concept is Netflix's Chaos Monkey, which randomly terminates AWS instances in some scenarios. They claim that this has helped them discover problems and build more redundant systems. What I'm talking about is lower level. The idea is for traditionally long-running processes to randomly exit. This should force redundancy into the design and ultimately produce more resilient systems. Does this concept already have a name? Is it already being used in the industry?

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• Solutions for "Maintenance Mode"

  - by Ka Lyse

  Given a web application running across 10+ servers, what techniques have you put in place for doing things like altering the state of your website so that you can implement certain features. For instance, you might want to: Restrict Logins/Disable Certain Features Turn Site to "Read Only" Turn Site to Single "Maintenance Mode" page. Doing any of the above is pretty trivial. You can throw a particular "flag" in an .ini file, or add a row/value to a site_options table in your database and just read that value and do the appropriate thing. But these solutions have their problems. Disadvantages/Problems For instance, if you use a file for your application, and you want to switch off a certain feature temporarily, then you need to update this file on all servers. So then you might want to look at running something like ZooKeeper, but you are probably overcomplicating things. So then, you might decide that you want to store these "feature" flags in a database. But then you are obviously adding unncessary queries to each page request. So you think to yourself, that you will throw memcached in to the mix and just cache the query. Then you just retrieve all of your "Features" from memcached and add a 2ms~ latency to your application on every page. So to get around this, you decide to use a two tier-cache system, whereby you use an inmemory cache on each machine, (like Apc/Redis etc). This would work, but then it gets complicated, because you would have to set the key/hash life to perhaps 60 seconds, so that when you purge/invalidate the memcached object storing your "Features" result, your on machine cache is prompt enough to get the the new states. What suggestions might you have? Keeping in mind that optimization/efficiency is the priority here.

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