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• "initialization error: class file has wrong version" message in JDeveloper 10.1.2.x

  - by [email protected]

  The "initialization error: class file has wrong version" has become a somewhat recurrent error message thrown by JDeveloper 10.1.2.x as newer JDKs have been released in the last years. Note that JDeveloper 10.1.2 was developed to run with JDK 1.4.2. The reasons for this error message to be thrown include: A JDK version higher than 1.4.2 is being used and some unexpected incompatibility conflicts can occur because of that Some of the libraries used on the workspace and/or project were compiled with newer JDK version So, it is strongly recommended to use newer JDeveloper versions (10.1.3 - 11g) for newer JDKs. JDeveloper 10.1.2 will be desupported in December 2010 (or later depending on the support contract). Further information about this can be seen at http://www.oracle.com/support/library/brochure/lifetime-support-middleware.pdf

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• Error while compiling ffmpeg during make

  - by Rahul Mehta

  I want to install ffmpeg on ubuntu. and following this article http://pasindudps.blogspot.com/2010/12/compiling-ffmpeg-in-ubuntu-1010.html but when m doing make after config Then go to the ffmpeg folder. cd ffmpeg Start the installation ./configure --enable-gpl --enable-version3 --enable-nonfree --enable-postproc \ --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb \ --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis \ --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab make giving this error /home/reach121/ffmpeg/libavcodec/x86/cabac.h:93: undefined reference to `ff_h264_norm_shift' /home/reach121/ffmpeg/libavcodec/x86/cabac.h:93: undefined reference to `ff_h264_lps_range' /home/reach121/ffmpeg/libavcodec/x86/cabac.h:93: undefined reference to `ff_h264_norm_shift' /home/reach121/ffmpeg/libavcodec/x86/cabac.h:93: undefined reference to `ff_h264_mlps_state' /home/reach121/ffmpeg/libavcodec/x86/cabac.h:93: undefined reference to `ff_h264_norm_shift' collect2: ld returned 1 exit status make: *** [ffmpeg_g] Error 1 Please suggest why this error is coming and what to do to solve this problem

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• Developing an analytics's system processing large amounts of data - where to start

  - by Ryan

  Imagine you're writing some sort of Web Analytics system - you're recording raw page hits along with some extra things like tagging cookies etc and then producing stats such as Which pages got most traffic over a time period Which referers sent most traffic Goals completed (goal being a view of a particular page) And more advanced things like which referers sent the most number of vistors who later hit a goal. The naieve way of approaching this would be to throw it in a relational database and run queries over it - but that won't scale. You could pre-calculate everything (have a queue of incoming 'hits' and use to update report tables) - but what if you later change a goal - how could you efficiently re-calculate just the data that would be effected. Obviously this has been done before ;) so any tips on where to start, methods & examples, architecture, technologies etc.

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• Depends libntfs10 error while installing testdisk

  - by user260223

  I want to install testdisk to ubuntu 10.04 LTS but i'm getting an error. Any help? Here is the output: # sudo apt-get install testdisk Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: testdisk: Depends: libntfs10 (>= 2.0.0) but it is not installable E: Broken packages I also tried: wget http://launchpadlibrarian.net/40386584/libntfs10_2.0.0-1ubuntu4_i386.deb; sudo dpkg -i *.deb And i get this error: dpkg: error processing libntfs10_2.0.0-1ubuntu4_i386.deb (--install): package architecture (i386) does not match system (amd64) Errors were encountered while processing: libntfs10_2.0.0-1ubuntu4_i386.deb

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• Alternative ways to make a battle system in a mobile indie game more fun and engaging

  - by Matt Beckman

  I'm developing an indie game for mobile platforms, and part of the game involves a PvP battle system (where the target player is passive). My vision is simple: the active player can select a weapon/item, then attack/use, and display the calculated outcome. I have a concept for battle modifiers that affect stats to make it more interesting, but I'm not convinced this by itself will add enough of a fun factor. I've received some inspiration from the game engine that powers Modern War/Kingdom Age/Crime City, but I want more control to make it more fun. In those games, you don't have the option to select weapons or use items, and the "battling" screen is simply 3D eye candy. Since this will be an indie game, I won't be spending $$$ on a team of professional 3D artists/animators, so my edge needs to be different. What are some alternatives to expensive eye candy that you or others have used to make a non-3D PvP game more fun and engaging? Did the alternative concepts survive the release?

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• Présentation de Robot Operating System, par Jérôme Laplace

  Salut, je signale un nouvel article pour les programmeurs-roboticiens. Il s'agit d'un article d'introduction à ROS (Robot Operating System). ROS est le standard qui monte dans le monde de la robotique. Il est gratuit, open-source et robuste. Pour ceux qui souhaitent découvrir ou aller plus loin dans la robotique et après en intelligence artificielle, je pense que ça peut être une introduction utile. Cet article ne comporte pas de code, il présente les concepts. A lire donc avec de faire les tutoriaux... Présentation de Robot Operat...

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• Error java.lang.OutOfMemoryError: getNewTla using Oracle EPM products

  - by Marc Schumacher

  Running into a Java out of memory error, it is very common behaviour in the field that the Java heap size will be increased. While this might help to solve a heap space out of memory error, it might not help to fix an out of memory error for the Thread Local Area (TLA). Increasing the available heap space from 1 GB to 16 GB might not even help in this situation. The Thread Local Area (TLA) is part of the Java heap, but as the name already indicates, this memory area is local to a specific thread so there is no need to synchronize with other threads using this memory area. For optimization purposes the TLA size is configurable using the Java command line option “-XXtlasize”. Depending on the JRockit version and the available Java heap, the default values vary. Using Oracle EPM System (mainly 11.1.2.x) the following setting was tested successfully: -XXtlasize:min=8k,preferred=128k More information about the “-XXtlasize” parameter can be found in the JRockit documentation: http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionXX.html

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• Firefox is pounding my system what should I do

  - by nikhil

  I'm running the latest version of firefox 17.0.1 on ubuntu 12.10 on a Acer Aspire One 722 Netbook. It has an amd dual core C60 processor and 2GB RAM. As you can see, firefox is absolutely killing my system, it responds really slowly and opening tabs is a royal pain. I have on an average 4-5 open tabs at a given time. Is there something that I can do to make my browsing experience more zippy? Additionally I run the following addons Firebug HTTPS Everywhere Ad block plus

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• "Unrecoverable error" during installation

  - by Sal

  I have an old Dell computer and I want to switch from windows xp and install the new ubuntu. I have tried multiple times to download it via cd-r but keep getting the same error message: unrecoverable error. The error happens after the menu which lists try ubuntu, install ubuntu, etc.It only gets as far as the Screen with a toolbar on the top that includes power, sound, and two arrows. That is when the message displays. switching to desktop version to find what the problem is( or something like that.) What is going wrong?

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• error with slap.d while installing any new software

  - by ali haider

  I am trying to install wireshark (this issue is not specific to wireshark) on my ubuntu box and I keep getting the following error for slap.d: Setting up slapd (2.4.23-6ubuntu6.1) ... Creating initial configuration... mkdir: cannot create directory `/etc/ldap/slapd.d': File exists dpkg: error processing slapd (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: slapd Besides uninstalling or trying to update open LDAP or slap.d, is there any other action that can be taken to resolve this issue? I am trying the install as root user & I have tried moving the slap.d conf file so far but without any luck. Any thoughts on troubleshooting/resolving this issue will be quite welcome. thank in advance

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• complex access control system

  - by Atul Gupta

  I want to build a complex access control system just like Facebook. How should I design my database so that: A user may select which streams to see (via liking a page) and may further select to see all or only important streams. Also he get to see posts of a friend, but if a friend changes visibility he may or may not see it. A user may be an owner or member of a group and accordingly he have access. So for a user there is so many access related information and also for each data point. I use Perl/MySQL/Apache. Any help will be appreciated.

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• System crash when trying to drag cells in LibreOffice Calc

  - by Juhele

  Some time after upgrady to Saucy I noticed several freezes and crashes when simply trying to drag content of selected cells to another place in LibreOffice Calc (version 4.1.2.3 from repository). The system stops responding - although for example Clementine still plays music from playlist - I am not able to do anything with the mouse (cursor is able to move, but no reaction on clicking). Did anybody of you also have this problem and if yes, do you have a solution? I tried to completely remove LibreOffice and install them again but did not worked for me. Currently avoiding use of drag and drop in Calc but it is stupid. Any advice would be helpful. Thanks

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• How to design a replay system

  - by daddz

  So how would I design a replay system? You may know it from certain games like Warcraft 3 or Starcraft where you can watch the game again after it has been played already. You end up with a relatively small replay file. So my questions are: How to save the data? (custom format?) (small filesize) What shall be saved? How to make it generic so it can be used in other games to record a time period (and not a complete match for example)? Make it possible to forward and rewind (WC3 couldn't rewind as far as I remember)

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• Project planning and customer tracking system

  - by Daniel Hollands

  First off, sorry if this is the wrong 'stack' site, but it seemed like a good place to start. I'm happy to report that my services as a web developer are starting to be in quite a lot of demand, and I have a few existing and potentially new customers all lining up - but I'm finding it very hard to keep track of everything. What I'm hoping for is some (preferably web-based) system which I can use to keep track of who my customers are, the various projects that I've got going on for them, and (if possible) the individual sub-tasks that make up each project. What would be even better is if the relevant customer was able to log into the site, and see the process of their projects. I do hope you know what I'm talking about, and that you'll be able to offer some suggestions of either web-base sites that offer something along these lines, or of some open source solution or something like that? Thank you

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• Database Management System do exist?

  - by Bakaburg

  I want to build a database for my no-profit association, and i was planning to do it by myself. But then i realize that really i don't have the time to buid a solid, secure system. So i was thinking, maybe like cms do exist, maybe there are also database management systems. I mean a layer of abstraction over the database that allow you manage data, manage access to data, create widgets with and expand the data. Maybe with a frontend to use this data and a backend to manage it. that is a cms but not based on pages and post but on data! Moreover, i would like some standard solution, because my IT management position ends this year, so i need something that will be easy to use and expand even by someone that is not a developer. So do exist something that fit my need? PS: i would really like some modern and visually pleasant solution, javascritp and ajax heavy and that relies the fewest is possible on server and reloading of the pages.

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• Best way to deal with a system without a user acceptance / testing phase

  - by billy.bob

  Historically I've been able to get away with making small changes to an in-house helpdesk system riding on a LAMP stack and just making a backup prior to editing. This has no user acceptance / testing phase and I work on the live .php files directly. However now the requirement has arisen that will require a bit more coding done, and I'm obviously not particularly happy about making these changes without a framework to support me. What would the best way forward be? I could just make another backup I suppose.

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• problems updating system with apt-get

  - by Javier

  After to do apt-get update and try with apt-get upgrade I have the next error message: This is a coppy of my terminal (in spanish) root@LinuxJGP:/home/javiergp# apt-get upgrade Leyendo lista de paquetes... Hecho Creando árbol de dependencias Leyendo la información de estado... Hecho Se actualizarán los siguientes paquetes: apport apport-symptoms fonts-liberation gnome-icon-theme gnome-orca language-pack-en language-pack-en-base language-pack-es language-pack-es-base language-pack-gnome-en language-pack-gnome-en-base language-pack-gnome-es language-pack-gnome-es-base light-themes linux-firmware oneconf resolvconf sessioninstaller software-center ssl-cert tzdata ubuntu-docs ubuntu-keyring ubuntu-sso-client ubuntuone-control-panel ubuntuone-installer unity-lens-video unity-scope-video-remote xdiagnose 29 actualizados, 0 se instalarán, 0 para eliminar y 0 no actualizados. E: Los archivos de índice de paquetes están dañados. No existe un campo «Filename:» para el paquete ubuntu-keyring. How can resolve this problem?

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• How are minimum system requirements determined?

  - by Michael McGowan

  We've all seen countless examples of software that ships with "minimum system requirements" like the following: Windows XP/Vista/7 1GB RAM 200 MB Storage How are these generally determined? Obviously sometimes there are specific constraints (if the program takes 200 MB on disk then that is a hard requirement). Aside from those situations, many times for things like RAM or processor it turns out that more/faster is better with no hard constraint. How are these determined? Do developers just make up numbers that seem reasonable? Does QA go through some rigorous process testing various requirements until they find the lowest settings with acceptable performance? My instinct says it should be the latter but is often the former in practice.

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• How to add menu items in System menu

  - by Leonardo Montenegro

  I want to insert an item to System menu: Help and Support About Gnome About Ubuntu More specifically, I want to insert a new item under "About Ubuntu". Trying with alacarte doesn't work. Cloning "ubuntu-about.desktop" file and changing his attributes doesn't work too (I even rebooted the computer after that). Searching for categories in "/usr/share/desktop-directories" haven't worked too, and searching for "core" and "about" entries in /etc/xdc/menus neither. It isn't as easy as I thought it would be. Anyone have any suggestions?

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• Install Ubuntu on Mac OS X Mavericks, MacBook Air

  - by Unknown

  I was wondering if its okay to install Ubuntu on my Macbook Air, and if it is okay please let me know the procedure. I would prefer to do it by NOT using reFind (not sure what the name is). The following is my system specification. Hardware Overview: Model Name: MacBook Air Model Identifier: MacBookAir6,2 Processor Name: Intel Core i5 Processor Speed: 1.3 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 3 MB Memory: 8 GB System Software Overview: System Version: OS X 10.9.2 (13C1021) Kernel Version: Darwin 13.1.0 Boot Volume: Macintosh HD Boot Mode: Normal MacBook Air (13-inch Mid 2013), OS X Mavericks (10.9.2)

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• cPanel email doesn't seem to work - error 550?

  - by Megh

  I am fairly new to the web hosting game, so bear with me :) Recently set up a VPS with cPanel and WHM. Everything is going well so far, I've created a user domain and transferred my website there, managed a couple of databases with phpmyadmin, everything was going great until I started messing around with email. I made an email account [email protected] through cPanel, although when I try and email this address I get the following error: Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Unknown user (state 13) Quite unsure of what to do next, in all honesty.

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• Dynamic obstacles avoidance in navigation mesh system

  - by Variable

  I've built my path finding system with unreal engine, somehow the path finding part works just fine while i can't find a proper way to solve dynamic obstacles avoidance problem. My characters are walking allover the map and collide with each other while they moving. I try to steering them when collision occurs, but this doesn't work well. For example, two characters block on the road while the third one's path is right in the middle of them and he'll get stuck. Can someone tell me the most popular way of doing dynamic avoidance? Thanks a lot.

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• What makes a good developer / system documentation?

  - by deamon

  Much time is wasted to get new developers started with existing software systems, because there is no good documenation. But what makes a system documentation good? One thing is a good API documentation like the Java API doc, but how to transfer the "bigger picture" and other things that cannot be placed in the API doc? One constraint is that it should not be to hard and time consuming to write the docs, because that is one reason why it is omitted so often. So, what makes documentation good?

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• Trying to setup first DirectX project (don't understand the error) [on hold]

  - by user1157885

  I've just started learning DirectX with the book "3D Game Programming with DirectX". I just finished setting up all the paths and adding the code to the project which I think I did correctly, but I get this massive error which I don't really understand and is hard to google. Could someone tell me what it means and how to fix it? Error 1 error TRK0002: Failed to execute command: ""C:\Program Files (x86)\Microsoft DirectX SDK (June 2010)\Utilities\bin\x64\fxc.exe" /nologo /Emain /Fo "C:\Desktop\DirectX 11 Projects\box\Win32Project2\Debug\color.cso" /Od /Zi "....\Book Files\3DGameProg\DVD\Code\Chapter 6 Drawing in Direct3D\Box\FX\color.fx"". The handle is invalid.

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• Developing an ELO like point system for a multiplayer gaming site

  - by Alejandro Piad

  I'm currently working on a gaming site where users will submit virtual players for different games, like Chess, Nash, Backgammon, Go, etc. The idea is that users don't compete themselves, but through their virtual players. There will be leagues, tournaments, and other competition formats. The question is which would be a good rating system for users in this environment. Take into account that every user may have many different virtual players playing in many different games. As a general guideline I would like to guarantee the following properties: Users who have a lot of mediocre players should not score higher than users with a few very good players. A user with a high rating should not be penalized if he adds a new bad player, until he has had enough time to improve his player. Users who don't play often should not score higher than users who play every day. Thanks in advance.

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