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• Creating a new DHCP lease databse

  - by Stee1bear

  I have Ubuntu Server set up as my DCHP server. We have had it install for a few year and our dchp.lease file contain over 4000 entries. I am wanting to clean it up and basically start a new lease file to get current list (@1500 entries). I have read the walk through on how to make a new lease file and get it started, which leads me to this question. Will the dhcp server try to give each unit new IP address or will it build the new database with the IP addresses that the the units report to it?

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• OSCON: Java and a Nice Discount

  - by Tori Wieldt

  Now in its 14th year, OSCON, O'Reilly's annual open source conference, will once again be in Portland, OR on July 16-20, 2012.  Join the world’s open source pioneers, builders, and innovators at the Oregon Convention Center for five intense days to learn about open development, challenge your assumptions, and fire up your brain.With 200+ speakers, 18 tracks, hundreds of technologies, and over 3,000 hackers in attendance, it's a place to learn and network. You’ll find practical tutorials, inspirational keynotes, and a wealth of information on open source languages, platforms, and development. OSCON includes whole track devoted to Java & the JVM, and the list of speakers is impressive. OSCON is where the serious thinkers and doers—and their favorite technologies—converge. And when the day’s sessions are over, join people just like you for some serious fun. Thanks to Java Magazine (you have subscribed to Java Magazine, right? If not, get your free digital subscription now!), you can register for OSCON and save 20% with code JAVAMAG.

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• What are some good, simple examples for queues?

  - by Michael Ekstrand

  I'm teaching CS2 (Java and data structures), and am having some difficulty coming up with good examples to use when teaching queues. The two major applications I use them for are multithreaded message passing (but MT programming is out of scope for the course), and BFS-style algorithms (and I won't be covering graphs until later in the term). I also want to avoid contrived examples. Most things that I think of, if I were actually going to solve them in a single-threaded fashion I would just use a list rather than a queue. I tend to only use queues when processing and discovery are interleaved (e.g. search), or in other special cases like length-limited buffers (e.g. maintaining last N items). To the extent practical, I am trying to teach my students good ways to actually do things in real programs, not just toys to show off a feature. Any suggestions of good, simple algorithms or applications of queues that I can use as examples but that require a minimum of other prior knowledge?

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• Choice Sessions: Java Champions at JavaOne

  - by Tori Wieldt

  There are so many reasons to attend JavaOne 2012 – great location, great networking opportunities but most importantly, great content! It’s tough to decide which sessions will be worth your while, but we advise you to start your decision making process by checking out sessions delivered by the 21 Java Champions attending and presenting at JavaOne. Java Champions are selected by their peers for their incredible contributions to the Java community and demonstration of their technical expertise in all aspects of Java. Our friend Markus Eisele @myfear has already kindly compiled a list in his blog entry Java Champions at JavaOne 2012 (thanks!). Happy schedule building!

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• Alternative to | more to display error results page by page

  - by Lane

  The command psql -d template_postgis2 -f /usr/share/postgresql/9.1/contrib/postgis-2.1/postgis.sql returns a list of errors that is too long to be displayed by scrolling up to the beginning of the error. I tried the same command with "| more" and "| less" added up at the end of the command but it does not display the message page by page as it should. I also tried to put the output in a file with "> file.txt" but I do not get in this new file what is displayed on the screen!! I don't understand why. I guess i can't do this with a psql command?? Is there any other way to get all the error message? Thanks for your help!

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• How to change the default desktop environment?

  - by Kshitiz Sharma

  I wanted to try out different desktop environments so I installed XFCE, KDE, GNOME, etc on top of Unity in Ubuntu 12.04 After a while I decided that I didn't like those other DEs and would stick to Unity. So I changed my default DE to Unity by configuring gdm. > sudo dpkg-reconfigure gdm Now I am able to choose my DE at login time and all of DEs are working properly. But the strange thing is that my boot up screen says 'lubuntu', my login screen is KDE, and my desktop is Unity. How and why is this happening? Why didn't my gdm configuration have any effect? Does login and boot up screen need to be configured separately from the DE? There are other similar questions here but they are not the same as this one. I do not want to remove the other enviroments I'm quite happy with having a list of DEs to select from. I want to know how to set proper defaults.

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• Which DB should I use for my newbie program?

  - by knijo

  I'm really new to programming, and I need some advice. I'm currently working on a very simple program to maintain a list of users at a company, as well as their clock in and clock out info. I would like to make this application easy to distribute (on a cd probably), and I'm looking for advice on which database to use for storing my data. My application is implemented using java and swing. A friend recommended MySQL, but I don't want to go installing the db server on every computer the application is installed on. Another friend recommended Access. Any tips would be greatly appreciated

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• Scan-Line Z-Buffering Dilemma

  - by Belgin

  I have a set of vertices in 3D space, and for each I retain the following information: Its 3D coordinates (x, y, z). A list of pointers to some of the other vertices with which it's connected by edges. Right now, I'm doing perspective projection with the projecting plane being XY and the eye placed somewhere at (0, 0, d), with d < 0. By doing Z-Buffering, I need to find the depth of the point of a polygon (they're all planar) which corresponds to a certain pixel on the screen so I can hide the surfaces that are not visible. My questions are the following: How do I determine to which polygon does a pixel belong to so I could use the formula of the plane which contains the polygon to find the Z-coordinate? Are my data structures correct? Do I need to store something else entirely in order for this to work? I'm just projecting the vertices onto the projection plane and joining them with lines based on the pointer lists.

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• How and when is old-releases.ubuntu.com updated?

  - by muru

  The old-releases.ubuntu.com mirror hosts the repositories for EOL Ubuntu releases. The main page currently lists up to 11.10 (or 12.04.3 if you count point upgrades), but the dists page lists up to 13.04. Why the discrepancy? When will the main page be updated? When will the newest EOL release (13.10) be shifted here? I'd like documentation backing up answers, please. Priority of documentation: Statements by Mark Shuttleworth (on his blog or other public statements) Pages from the Official Ubuntu documentation Ubuntu mailing list discussions, Launchpad bug reports (or questions) or blueprints, etc. IRC discussion logs for official Ubuntu channels Random gossip on the street Community Wiki.

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• Adding your website to free web directories as a link building strategy

  - by Man

  It's been two month I've launched a website. I recently ran into some websites which list directory of other websites. Some examples can be http://www.addgoogleurl.com/ and webdirectorieslist.com, etc. I was talking with my colleague and he says, adding the URL of my website to these kind of websites will negate the effect of other organic real links. Does google consider positive/negative points for these kind of links from web directory websites? Do you have any source for your answer to refer to? I found this question asked before on webmasters.SE, this is asking about many links from a website.

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• Administrator user session only shows a terminal

  - by Saariko

  Weird problem: After upgrading to 11.10 (and I am sure that I worked with it for couple of days). We had a power failure, and now, when open the computer, what I get is a screen, with a scrollable list of users (administrator is one of them). When I select the administrator user, and login, I get on the top left a terminal window. That's it ! I don't see my regular ubuntu desktop. What's wrong? I have tried some of the issues mentioned here: Delete the .Xauthority sudo apt-get update *I had some DNS errors, so had to fic my /etc/resolv.config (works now) please advise.

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• Network Manager troubleshooting

  - by Anero

  I'm having some issues when connecting to my house's wifi from my Ubuntu 10.10 laptop. If the connection doesn't exists, when selecting the network (and after entering the WPA2 password) I'm able to connect. Once the connection is saved, when trying to reconnect, Network Manager works for a minute or so and then fails; the only way to reconnect then is to delete the saved connection and re-select the network from the list of available wireless networks. The same network works with no issues on the same laptop when running Win7, and on other wireless networks when running Ubuntu. Is there a Network Manager log which I can take a look at for troubleshooting the issue? Are there any tools for checking the wifi status?

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• Using normals in DirectX 10

  - by Dave

  I've got a working OBJ loader that loads vertices, indices, texture coordinates, and normals. As of right now it doesn't process texture coordinates or normals but it stores them in arrays and creates a valid mesh with the vertices and indices. Now I am trying to figure out how can I make the shader use the correct normal in the array for the current vertex if I can't setnormals() to my mesh. If I were to just use an index in my array of normals corresponding to the index in the vertices, how would I retrieve the current index the shader is processing? BTW: I am trying to write a blinn-phong shader technique. Also when I create the input layout and I've added the semantic NORMAL to it, how would I list the multiple semantics in that single parameter? Would I just separate it with a space? PS: If you need to see any code, just let me know.

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• How well does an INCA IM-201W Wireless work?

  - by Eray

  I'm using Ubuntu 11.04 . I'll buy a wireless modem, Inca IM-201W . But i'm looking supported OS of modem : Windows XP , Vista, 7 . There isn't Ubuntu in list.SO what's the meaning of this ? Shouldn't I buy this modem ? I will use wireless connection. (PS. Sometimes, while i'm trying to connect a Wireless network on any cafe, i'm having problem. My laptop isn't connecting to wireless networks sometimes . )

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• Cliché monsters to populate a steampunk fantasy setting dwarven dungeon?

  - by Alexander Gladysh

  I'm looking for a list of cliché monsters for a steampunk computer game (assume one kind or another of casual rogue-like RPG), to populate lower levels of ancient dwarven-built dungeons. Dwarves are a technology/science race in the setting I am aiming for. The world is a low-magic one. I'm stuck after listing various mechanical golems, gigantic spiders (every dungeon must have some of them!), and maybe a mechanical barlog as a megaboss. What would player expect? What are the key cultural references for such setting? I know a couple of games with suitable steampunk dwarves, but none are detailed enough in the underworld monsters area. Please point me in the right direction. (If you have a single funny monster suggestion, please mention it in comments, not in answer. ;-) )

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• Truecrypted Windows 7 missing in Grub2 after upgrade

  - by user287545

  I have an encrypted dual boot Windows 7/Ubuntu System and upgraded my Ubuntu today. Everything went smooth but my Windows is not shown in the Grub2-List anymore. Starting up I have the Truecrypt Bootloader and after entering the Password I get to Grub (now Grub2). There my Windows 7 entry is missing now. Here is my report: http://paste.ubuntu.com/7569182/ Updating Grub did nothing to it. My guess is that within Ubuntu it does not recognize my Windows Installation on sda1 anymore. I can't mount it aswell. I can only mount it via Truecrypt itself. I think I might have to manually insert the menu item for Windows into that Grub config file. I guess that after entering the password in the truecrypt bootloader it would be possible to start Windows if the item was there - just a guess though. Edit: I basically followed these steps to set up my system: Dual Booting Windows 7 with Ubuntu 12.04LTS with Truecrypt

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• Rendering citations and references in HTML using PHP/Perl/Python/

  - by Nick

  Is there a PHP/Perl/Python/... library for picking citations out of an HTML file and rendering a nice list of references at the bottom, like in Wikipedia? I'm developing a website with heavily-sourced content, and I'd really like to have automatically-generated lists of formatted references, like in Wikipedia. (Check out their philosophy page, and see how the superscript numbered citations interact with the references at the bottom. This is all dynamically generated, automatically ordered & linked.) They do it really well: the citations are linked to the references (which are backlinked to the citations), when you click on one of the links, the target is highlighted, etc. I'm tempted to build the site on MediaWiki just for this one feature, but it seems like overkill. Do I have any options?

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• C# Timers for game development

  - by Valentin

  Hi, all! I want to find out the best way of creating time based events in games. Lets talk for example about Texas Holdem Poker. Server can handle thousands of tables and in every table we have timers: turn timer, hold seat timer and so on. What is the best way of timers realization for this purpose? Is System.Timers.Timer class can handle this or it will be more reasonable to create a separate thread with sorted time queue (for example an ascending sorted list with int values which represent time in ms remained)? Thanks in advance, Valentin

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• Delete blank row in dropdownlist or select default value in infopath dropdown

  - by KunaalKapoor

  Regular Dropdown (Pulling from DataSource)1. Double click on dropdown field in the data source.2. Select Fx button for Default value.3. Select Insert field or group.4. Select secondary xml from data source.5. Select “value” and click on ok.For a cascading dropdown:You have to add the rule and follow these steps,1. Rules -> ‘Add’ - > ‘Add Action’.2. Select ‘Set a field value’ option in first dropdown in Action.3. Select your field with help of ‘Select a Field or Group’ option in ‘Field’.4. Select your external data source list value in ‘Value’.This rule you can apply in OnLoad or whenever you will get external data source values.

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• What is the traditional way to maintain extensibility in a database-driven application like this?

  - by Jsess

  I'm working on a simple application for a game in Java that allows a user to record whether they have collected a given item and how much experience it contains. This will work for multiple item types (weapons, armor) and each will have its own tab with a list of all items that qualify under it. Making changes as new types are added is not such a big deal (if a clothing slot is added, for instance), but new items are added to the game all the time in biweekly patches, and I'm not sure what the traditional/customary way to make sure the application is user-extensible without requiring me to would be. Whether that would be adding a configuration menu that allows users to add news items (new rows to the local SQLite database) or a text file with something similar, but I'm certain there's a well-accepted way to do this that I'm not aware of. I'm new to databases and ignorant of the solution, so what's the professional/futureproof way to do this?

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• Efficient way of detecting a touched object in a game?

  - by Pin

  Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In my short experience, looping through all the visible objects in the scene and checking if they're touched has so far done the job, but when there may be many many moving objects in the screen that sounds kind of inefficient isn't it? Keeping the visible moving objects list can consume time in itself as one may have to loop through all of them each frame. Other solutions I've thought are: Spatial hashing. Divide the screen as a grid and place the visible objects in the corresponding bucket. Detection of the clicked object is fast but there's additional overhead for placing the objects in the correct bucket each frame. Maintaining a quad-tree. Moving objects have to be rearranged all the time, the previous solution looks better. What is usually done in this case?

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• Subversion BI experience - not a very good one, but working now

  - by Kevin Shyr

  Suffice to say there is now a document in place and I'm the drill sergeant, harassing people to do proper check in, and throw out those who don't.Some people suggest that in a SSIS project, it doesn't really matter if developers don't have the latest version of the project since package check in put the package in the repository, which we can pull out later.  I beg to differ because:When people don't see the package, they might start creating one because their user story require the use of the table.  So they will proceed to create a package and override whatever might already be in the repository.I didn't really see anywhere in the repository to say that which packages were for "deletion".  So I ended up restoring them all, and send the list out to developers.  Then we get into the area where we are relying on people's memory.I'd love to hear other people's experience using Subversion to manage a BI project.

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• Ubuntu Server Installer does not detect usb device

  - by Peter

  For some time now I am struggling with the 12.04 Ubuntu Server installer. I am trying to execute a clean, CD based install with the mentioned version onto an SD card. For the sake of the simplicity I have taken out the HDD. However, I had to recognise that the "disk detection" phase simply can not find the SDCARD. It says "No disk drive was detected. If you know the name of the driver needed by your disk drive, you can select from the list." What is really strange that I have tried the older Ubuntu Server installer (11.04) and this is simply recognising the sdcard... Does anyone have any idea? Many thanks, Peter

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• How to specify 'root' in path in text file

  - by DeanGrobler

  I'm following this tutorial located here on how to create a launcher for eclipse in unity. Everything is going pretty well so far, I've managed to successfully create the launcher but when I click on it, my system complains that the path to the exec is wrong. My exec for eclipse is located here: ~/opt/eclipse/eclipse And if you look at the tutorial you have to create a file and set it's contents like so: [Desktop Entry] Type=Application Name=Eclipse Comment=Eclipse Integrated Development Environment Icon=eclipse Exec=./opt/eclipse/eclipse Terminal=true Categories=Development;IDE;Java; In my case I have to provide the full location for the exec and there are a number of things that I tried that didn't work I set 'exec' to 'Exec=~/opt/eclipse/eclipse' , 'Exec=/opt/eclipse/eclipse' and 'Exec=root/opt/eclipse/eclipse' and none of these worked.. What should I set it to in order to fix the path so that my luancher works? Update------------------ I tried to list those 2 directories and what i get is this:

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• Requirement, architecture data capture tool

  - by Deno

  Are there any tools available for the following use case: I am planning to write a complex application and now I just know about the basic functional requirments. I am refining the functionality with more and more details. I am also writing down how to implement this in software architecture perspective. I am in a situation where there are multiple ways implement a certain functionality and based on the selected approach, other parts of the program will also change. At this moment, I don't want to decide on the approach to use, I just want to list down all the options, present to a wider audience and get it finalized. Are there any standard software tools to do this? I know I can use MS excel or some mind mapper tools, but just thinking of some standard tools (not just for programmers, but for managers and other) availability Thanks, Den

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