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• Migrating Spring to Java EE 6 Article Series at OTN - Part 3

  - by arungupta

  The spring season is characterized by migration of birds, whales, butterflies, frogs, and other animals for different reasons. If you use Spring framework and are interested in migrating to a standards-based Java EE platform, for whatever reason, then we have a solution for you. David Heffelfinger's, a renowned author and an ardent Java EE fan, has published third part of Spring to Java EE migration series at OTN. The article series takes a typical Spring application and shows how to migrate it to Java EE 6 using NetBeans. This new part builds upon part 1 and part 2 and also compares the generated WAR files and LoC in XML configuration in the two environments. There is an interesting discussion on Why Java EE 6 over Spring ? as well.

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• How do you assign commands to keys in Terminal?

  - by NES

  Is there a solution to assign special key combinations to words in terminal use. For example the less command is very usefull and i use i a lot to pipe the output of another process through it. The idea would be to set up special key combinations that are only active in terminal use assigned to write different commands? So pressing CTRL + l in terminal window could write | less or CTRL + G could stand for | grep Note: i just mean adding the letters to commandline not execute the finally. A similar way what's tabcompletion but more specific.

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• Dell Vostro 1510 trackpad

  - by user18055

  A week ago I moved totally from Windows 7 to Ubuntu. I've been really happy with the transition bar one annoying glitch. My trackpad sometimes works, sometimes doesn't. All other hardware including peripherals work flawlessly, including a Logitech ball mouse, Wacom Bamboo pen and touch and wireless Logitech keyboard and mouse combo. I can't see any pattern to when and why the trackpad works. Occasionally on rebooting, it will work, but then I can reboot 10x in a row and it won't work, then I leave it a day, then reboot and it works flawlessly. Any ideas on a solution or appropriate method for me to deb it? My knowledge of Ubuntu/Linux is sketchy at best so I could do with a little help :)

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• Code maintenance: To add comments in code or to just leave it to the version control?

  - by Chillax

  We have been asked to add comments with start tags, end tags, description, solution etc for each change that we make to the code as part of fixing a bug / implementing a CR. My concern is, does this provide any added value? As it is, we have all the details in the Version control history, which will help us to track each and every change? But my leads are insisting on having the comments as a "good" programming practice. One of their argument is when a CR has to be de-scoped/changed, it would be cumbersome if comments are not there. Considering that the changes would be largely in between code, would it really help to add comments for each and every change we make? Shouldn't we leave it to the version control?

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• Programming *into* a language vs. writing C code in Ruby

  - by bastibe

  Code Complete states that you should aways code into a language as opposed to code in it. By that, they mean Don't limit your programming thinking only to the concepts that are supported automatically by your language. The best programmers think of what they want to do, and then they assess how to accomplish their objectives with the programming tools at their disposal. (chapter 34.4) Doesn't this lead to using one style of programming in every language out there, regardless of the particular strengths and weaknesses of the language at hand? Or, to put the question in a more answerable format: Would you propose that one should try to encode one's problem as neatly as possible with the particulars of one's language, or should you rather search the most elegant solution overall, even if that means that you need to implement possibly awkward constructs that do not exist natively in one's language?

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• easy visualization of usage statistics (web app)

  - by sova

  I have some usage queries for my web app's database, the results of which I want to display graphically. Is there an easy-to-use api that exists for this purpose? I want to show things like average query-time per user (a small user-base), average query time per day, and things like that. I think it would be cool to show these on a two-axis graph. I am displaying this data on my site, so a jQuery/javascript/html solution for rendering information into graphs would be ideal. Thank you :) P.S. I wasn't sure if I should ask this on SO, but I am looking more for which product to use, not how to program with it.

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• Attach Keyboard/Mouse to X Display in Dell XPS L502x Dual Video Cards (Intel/Nvidia HDMI)

  - by lcoronelp

  The idea: Use a second monitor in Dell XPS L502x with HDMI port in Ubuntu 12.04 The process: I connect the HDMI cable to monitor. I read this and I have video in HDMI monitor with Bumblebee and this commands: optirun nvidia-settings -c :8 DISPLAY=:8.0 firefox I have created a second keyboard/mouse master group with xinput with this solution. The problem: The second monitor (Display 8) doesn't recognize the keyboard/mouse and I cant use it. The question: Do you know some command to attach the keyboard/mouse master group to Display 8? I think that xinput -set-cs may work but it does not.

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• 6 Steam Troubleshooting Tips

  - by Chris Hoffman

  Steam is generally pretty stable, but every now and then you’ll run into a problem. This guide gives solutions to common problems you’ll encounter in Steam, from games crashing or not working properly to Steam failing to launch. If none of these solutions helps, try Googling the problem – you may have run into a game-specific problem with a game-specific solution or just a more obscure Steam bug. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• eSeminar ISV Partner Update: High Quality Reporting for Your Applications

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

  Play eSeminar Duration: 18 Minutes         Description: This webinar presents to ISV Partners Oracle’s latest release of BI Publisher, and describes how this tool can make their applications more competitive and appealing to their customers by providing High Quality Reporting and Business Intelligence embedded into their solution. • BI Publisher can Provide All Reports… at Lower Cost • Easier, with Better Developer Productivity • Better Managed : Better Performance, Less Administration • Highest Quality : Pixel Perfect and Interactive Reporting. Play eSeminar (Only accessible to Oracle Partners).

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• 2D fighting bounding boxes

  - by user36420

  I'm prototyping a 2D platformer/brawler game for uni and I'm having some trouble with creating collision/bounding boxes. This is most likely going to end up on a Vita so I do have some library constraints as well as performance implications. None of this has yet been implemented but is all theory. My idea was to have the artist create a sprite sheet for the character animation and then a second identical sprite sheet with the corresponding collisions in a solid colour (e.g green for where the character can be hit and red for dealing damage, near the foot if kicking etc.) With this, I would then parse the collision sheet and generate the various collisions required storing them in the character model. This is the point I feel would be most inefficient. While I think this is a possible solution, I was wondering if there was a more standard way of doing this or a more efficient way as I feel this would have severe performance problems.

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• Kernel panic when booting from USB

  - by maaartinus

  I downloaded ubuntu-11.04-desktop-amd64.iso and used Universal-USB-Installer-1.8.6.3.exe to format my USB stick und put the ISO on it. When I tried to install from it, I've got a kernel panic just like here, except for the version number (mine was 2.6.38-8-generic #42-ubuntu). My ISO image seems to work, as I installed it into a VMWare player without problems. Booting Linux from USB works surely too, as I did it some time ago with an older Ubuntu version. I can imagine things to try out, e.g., write the image again, try another version, pray, look for patches, etc. However, I'm looking for a time-efficient solution, something what most probably works. An advice of the sort "wait two weeks until it's surely fixed, then download again" is acceptable, I'm determined to switch to Linux, but it can wait a bit.

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• RPG Item processing

  - by f00b4r

  I started working on an item system for my (first) game, and I'm having a problem conceptualizing how it should work. Since Items can produce a bunch of potentially non-standard actions (revive a character vs increasing some stat) or have use restrictions (can only revive if a character is dead). For obvious reasons, I don't want to create a new Item class for every item type. What is the best way to handle this? Should I make a handful of item types (field modifiers, status modifiers, )? Is it normal to script item usage? Could (should?) this be combined with the above mentioned solution (have a couple of different sub item types, make special case items usage scripted)? Thanks.

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• How to find classes that use certain DB tables

  - by Songo

  Problem: I'm asked to prepare a document where all our DB tables are listed and I'm supposed to list all Controllers that uses these DB tables for read and another list for Controllers that do write operations. Ex: +------------------------------------------+------------+ | DB table | tbl_Orders | +------------------------------------------+------------+ |Controllers that perform read operations | ?? | +------------------------------------------+------------+ |Controllers that perform write operations | ?? | +------------------------------------------+------------+ We are trying to write some documentation for a legacy system built using Zend framework. The code is scattered everywhere. There is code in the Controllers, in the models and even in the views. The application uses PROPEL as an ORM. What makes this really difficult is that the Controller may not be directly calling the table, but it may be instantiating a model class that calls that table. Is there an educated way to approach this crazy task? Note: Searching for the table name won't provide a solution because if a model uses that table I wouldn't know which Controller is using that model.

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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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• Best Practice to return responses from service

  - by A9S6

  I am writing a SOAP based ASP.NET Web Service having a number of methods to deal with Client objects. e.g: int AddClient(Client c) = returns Client ID when successful List GetClients() Client GetClientInfo(int clientId) In the above methods, the return value/object for each method corresponds to the "all good" scenario i.e. A client Id will be returned if AddClient was successful or a List< of Client objects will be returned by GetClients. But what if an error occurs, how do I convey the error message to the caller? I was thinking of having a Response class: Response { StatusCode, StatusMessage, Details } where Details will hold the actual response but in that case the caller will have to cast the response every time. What are your views on the above? Is there a better solution?

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• How can I compile an IP address to country lookup database to make available for free?

  - by Nick

  How would I go about compiling an accurate database of IP addresses and their related countries to make available as an open source download for any web developer who wants to perform a geographic IP lookup? It seems that a company called MaxMind has a monopoly on geographic IP data, because most online tutorials I've seen for country lookups based on IP addresses start by suggesting a subscription to MaxMind's paid service (or their less accurate free 'Lite' version). I'm not completely averse to paying for their solution or using the free one, but the concept of an accurate open source equivalent that anyone can use without restriction appeals to me, and I think it would be useful for the web development community. How is geographic IP data collected, and how realistic is it to hope to maintain an up-to-date open version?

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• Installling a brother printer in Ubuntu 12.04 (MFCJ6510DW)

  - by Gelterfinger

  I am trying to install a Brother MfCJ6510DW printer on Ubuntu 12.04. I have tried various ways, but nothing woks for me. I have downloaded the drivers from the solutions brother.com I tried to install from the "System setting- printing" on the pull-down menu. There I get the message "failed to read PPL file - it says something about a missing Asterisk in colum1 Line 1 In the terminal I get the message cannot find file or directory. Under localhost:631/printer, I get the message " no such file or directory" I tried to install the file I downloaded from the Brothers Solution Center on the Ubuntu Software Centre, there I get the message " The package is of bad quality" Help I downloaded Mfcj6510dwlpr-3.0.0-1.i386.deb and mfcj6510dwcupswrapper-3.0.0-1.i386 I also downloaded linux-bprinter-installer-1.0.0-1.gz, but this does not help either.

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• Writing a dynamic achievement system without hardcoding rules into the application

  - by imaginative

  I really enjoyed the solution provided here for groundwork on writing an achievement framework. The problem I have is I have game designers that would like to be able to insert achievements into a CMS at runtime. In a way, it sounds insane and complex to do this, but is it really? I think the concept of having to do a hard push of the application for every new achievement is cumbersome. I would love to be able to give our designers the capability to put together new achievements by entering them into a database. It shouldn't matter what tool I'm using, but for those interested, my backend is being written in JRuby (Ruby on top of the JVM). What are some possible ways of going about abstracting the logic in the aforementioned link even further so that rules can be interpreted at runtime?

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• How to write efficient code despite heavy deadlines

  - by gladysbixly

  I am working in an environment wherein we have many projects with strict deadlines on deliverables. We even talk directly to the clients so getting the jobs done and fast is a must. My issue is that i'd always write code for the first solution that comes to my mind, which of course I thought as best at that moment. It always ends up ugly though and i'd later realize that there are better ways to do it but can't afford to change due to time restrictions. Are there any tips by which I could make my code efficient yet deliver on time?

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• Fixing IP Renewal After Laptop Suspend

  - by Cerin

  I have a laptop running Ubuntu 10.04, and I've noticed that with some wifi networks, but not all, I'm unable to reconnect after coming out of suspension. I've tried both Network Manager and Wicd management daemons, and both get through validation, but get hung up on "Acquiring IP address...". The only solution I've found is to reboot the machine, after which it acquires an IP address very quickly. What's the underlying issue here? What would be a more efficient way to resolve the problem? EDIT: I've noticed that if I open Wicd and manually press "Connect", it fails to acquire an IP. However, if I do nothing and let it automatically try and connect, it acquires an IP and connects just fine...

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• Should I tell a departed coworker about their "sev 1" defect?

  - by noahz

  I had a co-worker leave our company recently. Before leaving, he coded a component that had a severe memory leak that caused a production outage (OutOfMemoryError in Java). The problem was essentially a HashMap that grew and never removed entries, and the solution was to replace the HashMap with a cache implementation. From a professional standpoint, I feel that I should let him know about the defect so he can learn from the error. On the other hand, once people leave a company, they often don't want to hear about legacy projects that they have left behind for bigger and better things. What is the general protocol for this sort of situation?

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• Why is my LAN not working properly ?

  - by ps06756

  I am using Ubuntu 12.04 as my OS. Till yesterday, my LAN was working fine , but after that my LAN is not working properly. What I mean is that it shows that the LAN wire is connected properly, but when I try to open a website it gets stuck on resolving host. I am using the web browser as Google-chrome. Now, when I manually switch off the wired connection and turn it on again, the LAN works perfectly till I open one or two webpages. After that the same problem repeats again. Can anybody, help me with a solution to this problem.

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• Run Java application as a different user [on hold]

  - by Harihar Das

  I need to run a few perl scripts from a Java GUI application. I am using Runtime API to do that. However, few of the perl scripts need to run under a specific user account to have special credentials to access specialized resources (e.g. Database, Files). I have heard of alleviating user access using UAC. But till now I am not able to find the solution. Please help me on how to run a process under a different user login. Is there anything similar to c# impersonization in Java?

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• How do I keep the Thunderbird profile in sync between multiple computers?

  - by David Planella

  I'd like to find a definitive solution to automatically keep my Thunderbird profile in sync between my laptop and my desktop computer. I'm using IMAP, so keeping the e-mail itself in sync is not an issue I can use Ubuntu One for the contacts, so that should not be an issue, either. However, there are a bunch of other files and folders in the Thunderbird profile, and I'm not sure which ones I should keep in sync and which ones I shouldn't bother about. Ideally, I'd like to use Ubuntu One to mark the required ones for syncing, but I would appreciate any help in deciding which ones exactly need to be synced.

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• Wordpress : Automatically transfer media files to Amazon S3

  - by Ron Ranieri

  I've been using VPS to host 7 Wordpress websites, most of them require big storage but very little RAM and traffic. So I'm thinking of moving the static files(uploads folder) content to Amazon S3 and I'm looking for the most viable solution to this. I want every website to have their own bucket and newly uploaded media files automatically uploaded to Amazon S3 without using plugin. I'm ok with cron job, for example the files were uploaded first to my server, then transferred to S3 and deleted from my server every 24 hour. Or is there any way for me to change the default upload directory to my S3 bucket without sacrificing any Wordpress functionality(resize/title etc)? What do you think the most efficient way to do this? Currently I'm looking at this plus cron job but I would like to know better option if it exist.

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