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• Pro Google App Engine developer interview questions (with answers)

  - by WooYek

  What are good questions to determine if applicant is pro Google App Egine developer? Questions that can distinguish that someone is not an ad-hoc GAE programmer, but is really doing professional GAE development, with all areas concerned (eg. performance, transactions, async/batch data processing). Please provide answers, so an intermediate developer (such as myself :) can interview someone more experienced. Please avoid open questions. If possible please provide a link to a documentation part that's covering a topic in question. Please keep one interview question/answer per response for better reading experience and easier interview preparation.

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• Convert filenames to their checksum before saving to prevent duplicates. Is is a smart thing to do?

  - by Xananax

  TL;DR:what the title says I am developing some sort of image board in PHP. I was thinking of changing each image's filename to it's checksum prior to saving it. This way, I might be able to prevent duplicates. I know this wouldn't work for two images that are the same but differ in size or level of compression or whatnot, but this method would allow for an early check. What bugs me is that I never saw this method implemented anywhere, so I was wondering if there is a catch to it. Maybe it is just more efficient to keep the original filename and store the hash in DB? Maybe the whole method is just not useful and my question is moot? What do you think? On a side note, I don't really get how hashes are calculated so I was wondering, if my first question checks out, if it would be possible to calculate the likeness that two images are similar by comparing hashes (levenshtein or something of the sort).

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• Even More New ADF Bloggers

  - by Shay Shmeltzer

  A couple of weeks back I posted an entry about new ADF related blogs that I found out about. Well as they say "when it rain it pours"  - and over the past few days I came across several other new bloggers that cover ADF. So here are a few others that you might want to add to your ADF blog aggregator: http://adfplus.blogspot.com - Paco van der Lindenhttps://blogs.oracle.com/aramamoo/ - Arunhttp://e20labs.org - Chad Thompsonhttp://oracleadfhowto.blogspot.com/ - Vinay Agarwalhttp://javaosdev.blogspot.com - Donovan Sherriffs https://blogs.oracle.com/prajkumar - Phil Wanghttp://oracle-itself.tumblr.com - Wael Abdeenhttps://blogs.oracle.com/adfthoughts - Raphael Rodriguehttp://adfwithejb.blogspot.com - Prateek Kumar shaw And here are a few more that are not just about ADF but do have the occasional ADF related entry:http://yonaweb.be - Yannick Ongenahttp://blog.whitehorses.nl - whitehorseshttps://blogs.oracle.com/imc - ISV Migration Center Team and the usual reminder here: To keep track of all things new in the ADF blog world follow the JDeveloper twitter or like JDeveloper on facebook to get notified of the latest entries we find for you around the world.

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• Smooth Camera Rotation around 90 degrees

  - by Nicholas

  I'm developing a third person 3D platformer in XNA. My problem is when I try to rotate the camera around the player. I would like to rotate (and animate) the camera 90 degrees around the player. So the camera should rotate until it has reached 90 degrees from the starting position. I cannot figure out how to keep track of the rotation, and when the rotation has made the full 90 degrees. Currently my cameras update: public void Update(Vector3 playerPosition) { if (rotateCamera) { position = Vector3.Transform(position - playerPosition, Matrix.CreateRotationY(0.1f)) + playerPosition; } this.viewMatrix = Matrix.CreateLookAt(position, playerPosition, Vector3.Up); } The initial position of the camera is set in the constructor. The "rotateCamera" bool is set on keypress. Thanks for the help in advance. Cheers.

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• recurring billing / profiles management system

  - by Karl Cassar

  As a company, we have various recurring fees which our clients pay - these can include: hosting plans maintenance agreements SLAs ... I would like to know if anyone knows of a good, web-based recurring billing / payments management system which we could use to help us get more organised regarding this aspect of our business. Basically, we would need to: Create recurring profiles, e.g: Hosting, emails / domain services @ 200eur / year Be able to give free / extend the subscription period, for any reason. Also, we don't have specific products which we would like to choose and charge - all these recurring fees are discussed with the clients, and are created on a per-client basis. I'm not sure if this is the best place to ask for, however since I think most 'webmasters' require such a system to keep track of payment, I thought this would be the place to go for. Thanks in advance!

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• SSH'ing to my machine attaches an existing screen session and detaching it ends my SSH session

  - by jsplaine

  ssh'ing to my Ubuntu machine automatically attaches an existing screen session and detaching ends my ssh session What I want is to be able to ssh to my Ubuntu machine without automatically attaching to the screen session on that machine. Or at least, I should be able to to detach from that screen session w/o ending my ssh session .. right? Doesn't seem to work. This so that I can attempt to run firefox --display <whichever one is being forwarded to my ssh session>, so that I can debug a website that the remote Ubuntu machine is running (via localhost). Best case scenario is that I could just remote-desktop to my Ubuntu machine. But it's not set up to allow remote-desktop, and I see no way to set it up remotely via shell/ssh. Also, it sounds like you need a static IP in order to remote desktop to an Ubuntu machine (so I keep reading).

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• Calculate an AABB for bone animated model

  - by Byte56

  I have a model that has its initial bounding box calculated by finding the maximum and minimum on the x, y and z axes. Producing a correct result like so: The vertices are then stored in a VBO and only altered with matrices for rotation and bone animation. Currently the bounds are not updated when the model is altered. So the animated and rotated model has bounds like so: (Maybe it's hard to tell, but the bounds are the same as before, and don't accurately represent the rotated/animated model) So my question is, how can I calculate the bounding box using the armature matrices and rotation/translation matrices for each model? Keep in mind the modified vertex data is not available because those calculations are performed on the GPU in the shader. The end result I want is to have an accurate AABB the represents the animated model for picking/basic collision checks.

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• managing information/functionality on shared common project classes

  - by ilansch

  In my company, we have a common solution the contains common projects (2 projects so far, one for .net 3.5 and one for .net 4.5). My main problem is that during time, a lot of code is added, for example hosting a process as windows service is a class called ServiceManagement, But no one but the developer knows it, and if someone wants to use this shared class, he does not know it exist. So i am looking for a way to document and manage all the classes with tags, a 3rd party util/web util, that i can search for tags and maybe find common classes that i can use (if we keep all our code well-documented). Does anyone familiar with sort of tools ?

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• What method replaces GL_SELECT for box selection?

  - by Jake

  Last 2 weeks I started working on a box selection that selects shapes using GL_SELECT and I just got it working finally. When looking up resources online, there is a significant number of posts that say GL_SELECT is deprecated in OpenGL 3.0, but there is no mention of what had replace that function. I learnt OpenGL 1.2 in back in college 2 years back but checking wikipedia now, I realise we already have OpenGL 4.0 but I am unaware of what I need to do to keep myself up to date. So, in the meantime, what would be the latest preferred method for box selection? EDIT: I found http://www.khronos.org/files/opengl-quick-reference-card.pdf on page 5 this card still lists glRenderMode(GL_SELECT) as part of the OpenGL 3.2 reference.

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• Iptables on ubuntu Ubuntu 10.04.1 not working

  - by Kevin

  I am trying to block an IP address from accessing my server by using iptables, but didn't succeed. Here are the commands that I used. (after these commands, I still keep seeing 50.18.12.86 sending request to my Apache server). sudo iptables -F sudo iptables -I OUTPUT -s 50.18.12.86 -j REJECT sudo iptables -I INPUT -s 50.18.12.86 -j REJECT sudo iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination REJECT all -- 50.18.12.86 0.0.0.0/0 reject-with icmp-port-unreachable Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination REJECT all -- 50.18.12.86 0.0.0.0/0 reject-with icmp-port-unreachable I have tried DROP instead of REJECT, but doesn't help.

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• Improving without mentor

  - by speeder

  Although I consider myself not much experienced, I keep landing in jobs as the leader somehow (in the current one I am tech director of the company, in a previous one I was the R&D head). I understand why this happen (I have a certain specific set of skills, and I use some uncommon programming languages), my issue is: I cannot find a mentor... I know there must be stuff to me learn, and I notice as I work over the years that I am slowly learning more and more, but I believe that there are some way to get better much faster than just coding... So, how I improve when there are no other person in the company to teach me, or to me read their code? (or fix their code even...) I think I am beyond books, but way below a "master" level, so I don't know where to learn more.

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• install error wubi 12.10 rev273

  - by Doug

  Keep getting this error when installing wubi 12.10 rev273 11-09 14:16 ERROR TaskList: Error executing command command=C:\Windows\sysnative\bcdedit.exe /set {31400a42-f78f-11e0-9f68-e8757c793044} device partition=F: retval=1 stderr=An error has occurred setting the element data. The request is not supported. stdout= Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in call File "\lib\wubi\backends\win32\backend.py", line 697, in modify_bcd File "\lib\wubi\backends\common\utils.py", line 66, in run_command Exception: Error executing command command=C:\Windows\sysnative\bcdedit.exe /set {31400a42-f78f-11e0-9f68-e8757c793044} device partition=F: retval=1 stderr=An error has occurred setting the element data. The request is not supported. Am trying to install in F drive Doug

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• The Information Driven Value Chain - Part 1

  - by Paul Homchick

  One hundred years ago, there were places on Earth that no man had ever seen.  Today, a man standing in one of those places can instantaneously communicate with someone who may be strolling down the street on his way to lunch half way around the globe.  Our world is shrinking and becoming virtual. It is a world of incredible bounty and speed where we can get a product delivered to us anywhere on earth within a day or two. However, this world is also one of challenge where volatility, uncertainty, risk and chaos are our daily companions. To prosper amid the realities of this new world, the enterprise needs a business model. Globalization and instant communications demand greater operational flexibility than ever before. Extended supply chains have elevated the management of risk to a central concern, and regulatory demands from multiple governments place an increasing burden of compliance on companies. Finally, the speed of today's business requires continuous innovation to keep from falling behind the global competition.

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• Boots up into Terminal

  - by Jacob Larson

  I am running a 64 bit version of Ubuntu 12.04.1, and I when I boot up, I am thrown (Rather violently. :P) a full-sized terminal, instead of my lovely GUI login screen.. So I looked around and tried the "startx" command, which works like a charm. Only problem is that now, I have no clue how to keep it from booting to the terminal every time, and boot up into the regular GUI with all my stuff. I did install some kernel updates the night before, though I restarted my computer twice after I had done so without a problem. Thanks for your time!

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• Agile Development Requires Agile Support

  - by Matt Watson

  Agile developmentAgile development has become the standard methodology for application development. The days of long term planning with giant Gantt waterfall charts and detailed requirements is fading away. For years the product planning process frustrated product owners and businesses because no matter the plan, nothing ever went to plan. Agile development throws the detailed planning out the window and instead focuses on giving developers some basic requirements and pointing them in the right direction. Constant collaboration via quick iterations with the end users, product owners, and the development team helps ensure the project is done correctly.  The various agile development methodologies have helped greatly with creating products faster, but not without causing new problems. Complicated application deployments now occur weekly or monthly. Most of the products are web-based and deployed as a software service model. System performance and availability of these apps becomes mission critical. This is all much different from the old process of mailing new releases of client-server apps on CD once per quarter or year.The steady stream of new products and product enhancements puts a lot of pressure on IT operations to keep up with the software deployments and adding infrastructure capacity. The problem is most operations teams still move slowly thanks to change orders, documentation, procedures, testing and other processes. Operations can slow the process down and push back on the development team in some organizations. The DevOps movement is trying to solve some of these problems by integrating the development and operations teams more together. Rapid change introduces new problemsThe rapid product change ultimately creates some application problems along the way. Higher rates of change increase the likelihood of new application defects. Delivering applications as a software service also means that scalability of applications is critical. Development teams struggle to keep up with application defects and scalability concerns in their applications. Fixing application problems is a never ending job for agile development teams. Fixing problems before your customers do and fixing them quickly is critical. Most companies really struggle with this due to the divide between the development and operations groups. Fixing application problems typically requires querying databases, looking at log files, reviewing config files, reviewing error logs and other similar tasks. It becomes difficult to work on new features when your lead developers are working on defects from the last product version. Developers need more visibilityThe problem is most developers are not given access to see server and application information in the production environments. The operations team doesn’t trust giving all the developers the keys to the kingdom to log in to production and poke around the servers. The challenge is either give them no access, or potentially too much access. Those with access can still waste time figuring out the location of the application and how to connect to it over VPN. In addition, reproducing problems in test environments takes too much time and isn't always possible. System administrators spend a lot of time helping developers track down server information. Most companies give key developers access to all of the production resources so they can help resolve application defects. The problem is only those key people have access and they become a bottleneck. They end up spending 25-50% of their time on a daily basis trying to solve application issues because they are the only ones with access. These key employees’ time is best spent on strategic new projects, not addressing application defects. This job should fall to entry level developers, provided they have access to all the information they need to troubleshoot the problems.The solution to agile application support is giving all the developers limited access to the production environment and all the server information they need to see. Some companies create their own solutions internally to collect log files, centralize errors or other things to address the problem. Some developers even have access to server monitoring or other tools. But they key is giving them access to everything they need so they can see the full picture and giving access to the whole team. Giving access to everyone scales up the application support team and creates collaboration around providing improved application support.Stackify enables agile application supportStackify has created a solution that can give all developers a secure and read only view of the entire production server environment without console or remote desktop access.They provide a web application that provides real time visibility to the important information that developers need to see. An application centric view enables them to see all of their apps across multiple datacenters and environments. They don’t need to know where the application is deployed, just the name of the application to find it and dig in to see more. All your developers can see server health, application health, log files, config files, windows event viewer, deployment history, application notes, and much more. They can receive email and text alerts when problems arise and even safely query your production databases.Stackify enables companies that do agile development to scale up their application support team by getting more team members involved. The lead developers can spend more time on new projects. Application issues can be fixed quicker than ever. Operations can spend less time helping developers collect server information. Agile application support starts with Stackify. Visit Stackify.com to learn more.

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• Hard-copy approaches to time tracking

  - by STW

  I have a problem: I suck at tracking time-on-task for specific feature/defects/etc while coding them. I tend to jump between tasks a fair bit (partly due to the inherit juggling required by professional software development, partly due to my personal tendancy to focus on the code itself and not the business process around code). My personal preference is for a hard-copy system. Even with gabillions of pixels of real-estate on-screen I find it terribly distracting to keep a tracking window convienient; either I forget about it or it gets in my ways. So, looking for suggestions on time-tracking. My only requirement is a simple system to track start/stop times per task. I've considered going as far as buying a time-clock and giving each ticket a dedicated time-card. When I start working on it, punch-in; when done working, punch-out.

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• Using DLLEXPORT to export DLL function With Class to C#

  - by SICGames2013

  In my previous revision game engine I deported major functions for the game editor for C#. Now, I'm beginning to revise the game engine with a static library. There's a already dynamic library created in C++ to use DLLEXPORT for C#. Just now I want to test out the newer functions and created a DLL file from C++. Because the DLL contains classes I was wondering how would I be able to use DLL Export. Would I do this: [DLLEXPORT("GameEngine.dll", EntryPoint="SomeClass", Conventional=_stdcall)] static extern void functionFromClass(); I have a feeling it's probably DLLImport and not DLLExport. I was wondering how would I go about this? Another way I was thinking was because I already have the DLL in C++ prepared already to go the C# Class Library. I could just keep the new engine as a lib, and link the lib with the old DLL C++ file. Wouldn't the EntryPoint be able to point to the class the function is in?

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• junior / professional / senior categorization

  - by oozoo

  Hey guys, is it just me or is the categorization of developer levels highly subjective? I get the feeling that every company tries to hire experienced developers as juniors because they don't know $technology. For example my own career: I switched technologies a couple of times, while sticking to java as a programming language. For example I first worked for 3 years using JavaSE technologies, the next company I worked for hired me as junior because I didn't have JavaEE experience - while still selling me as professional level to customers (I work in consulting). The next company hired me again as junior because I didn't have SAP experience - they mostly work with SAP Java technologies which is definitely a niche. Still, they are selling all their technology consultants for exactly the same rate while paying them significantly different wages. Now when switching jobs again I feel like this whole thing is going to start all over again because I don't have Spring experience or Oracle knowledge. tl;dr = is my observation totally off base that companies are just using these categorizations as means to keep down wages?

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• Unable to set default gateway

  - by GrandMasterFlush

  I'm running Ubuntu server via Hyper-V and have successfully installed it but seem unable to ping the server or ping any other machines on the network from the server. After doing a bit of reading I've noticed that the default gateway isn't set but when I try and set it I keep getting error messages which I can't understand. From this article I've tried ip route add default via 10.0.10.200 Which reports: RTNETLINK answers: Operation not permitted If I try running it prefixed with sudo but it reports: `RNETLINK answers: No such process I've editted /etc/network/interfaces but when I start the machine and type netstat -nr there is nothing listed. Can anyone tell me where I'm going wrong please? EDIT : /etc/network/interfaces contains: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp

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• Organizing code for iOS app development

  - by KronoS

  I've been developing an app for the iOS platform, and as I've been going along, I've noticed that I've done a terrible job of keeping my files (.h, .m, .mm) organized. Is there any industry standards or best practices when it comes to organizing files for an iOS project? My files include custom classes (beside the view controllers), customized View Controllers, third-party content, code that works only on iOS 5.0+ and code that works on previous versions. What I'm looking for is a solution to keep things organized in a manner that others (or myself in years to come) can look at this and understand the basic structure of the application and not get lost in the multiple files found therein.

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• Craft a Drinkable Density Column

  - by Jason Fitzpatrick

  Earlier this month we shared a clever 9-layer density column demonstration you’d most certainly not want to drink. This smaller demonstration, however, is a delicious column of fruit flavors. The secret sauce? In the previous experiment we shared the secret was using fluids with naturally varying densities (such as lamp oil and vegetable oil); in this experiment you’ll be relying on varying amounts of sugar in each layer to change the density of the water and keep them separate (and edible). You’ll need some Skittles, a few drinking glasses, water, and for best effect, a tall and narrow glass or graduated cylinder. Hit up the link below for the full details on the experiment and tips on how to carefully layer the liquids. Make a Drinkable Rainbow in a Glass [i09] Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

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• Networking Client Server Packet logic (How they communicate)

  - by Trixmix

  I want to know what is the logic behind server client communication through packets for a real time game. for example the server sends x packets then the client receives x packets and processes them.. Basically what is the process to keep the client and server in sync and able to receive and send packets. more in depth example of what I want to know: client step 1 wait for a packet step 2 read x packets step 3 process x packets step 4 send x packets and so on... I need to know the very basic outline of the communication. Big questions are: 1) do I send and read packets all at one time? i.e for loop though the incoming packets array list and read them all or one every server loop or what... 2) what order should I do things i.e first receive then read then process then send etc.. 3) what I asked above a step by step of what the server / client should do.. Thanks!

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• Difference in fans on Windows 7 and Ubuntu 12.04

  - by Timo

  I have bought a Hp Pavilion DV7 with Core i7 CPU and installed Ubuntu 12.04 on dual boot with Windows 7 alongside. Apart from the difference in battery life (although that's fixed with Jupiter), I have another problem with the fans. On Windows my fans work perfectly and the laptop is cool, but it seems to overheat in Ubuntu. It becomes quite hot and it looks like my fans are not working under Ubuntu. I think I'm having the same problem as How can I keep the cpu temp low?, but since I cannot comment because of the lack of reputation (?), I post the question as a new thread. I think the result of the overheating is that my keyboard doesn't seem to follow when I start typing a long text. It just freezes and types the last letter multiple times. For example: when I type the word freezes, it shows freeeee so the zes changed into eee...

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• Blog...Dead & New Address

  - by Derek Comingore

  Hi Folks! For a while I was attempting (probably the correct word) to keep both this blog as well as my SQL Server Magazine SQL Server BI blog current. Working on growing B.I. Voyage , speaking, writing, and blogging is quite the work load. And so this blog suffered as a result. THANK YOU all who read my blog here on SQLTeam.com, I intend to leave it live for those who might benefit from its content at a later date. My consolidated, single blog can be found at http://www.sqlmag.com/blogs/sqlserverbi.aspx . Cheers, Derek

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• Day 1 - Finding Like Minds

  - by dapostolov

  So, is being a Game Developer any different from being an IT Developer? I picture a poorly lit environment where I get to purchase my own desk lamp; I'm thinking one of those huge lava lamps that pump out so much heat you could fry an egg on it. To my right: a "great wall" of empty coke cans dwarf me. Eating my last slice of pizza I look across my desk to see a fellow developer with a smug look on his face;  he's just coded his latest module for the game and it looks like he's in nirvana. My duty, of course, is to remind him to keep focused on the job at hand. So, picking up my trusty elastic and aerodynamically crafted paper bullet I begin a 10 minute war of welts and laughter which is promptly abrupted by our Project Manager demanding more details from our morning Scrum meeting. After providing about 5 minutes of geek speak and several words of comfort to make his eyes glaze over...it hits me, the idea for the module...beckoning my developer friend over, we quickly shoo the Project Manager away and begin our brainstorming frenzy ... now, where'd I put that full can of coke? OK. OK. This isn't probably the most ideal game developer environment, but it definitely sounds fun to me...and from what I gather is nothing like most game development companies. But I'm not doing this blog series to "go pro"; like I stated in my first post I want to make a 2D game from an idea my best friend and I drummed up long, long ago. I'm in this for the passion AND I want to see how easy it is for us .Net Developers to create a game. So where do I start? Where can I find like minded individuals? What technologies are there? What do I need to make a video game? The questions are endless....AND...since I already have an idea ... lets start with ... Technology (yes, I'm a geek, live with it...) Technology OK. Predominantly, games are still made in C++ or even C. I'm not sure how much assembly code is floating around lately, however, that is not my concern. I do know C / C++ from my past, enough to even get me by, but I'm mainly interested in a recent, not-so-new, technology called XNA. What is XNA? XNA allows us .Net Developers to make 2D / 3D games for windows, Xbox*, and Windows Mobile 7*. * = for a nominal fee *cough* The following link is your one stop shop to XNA game development: http://creators.xna.com/en-US/education/gettingstarted The above site hosts information such as: - getting started - a sample/instructional shooter game in 2D / 3D with code (if I'm taking too long for you in this blog series) - downloads - starter kits... http://creators.xna.com/en-US/education/starterkits/ And of course...forums. You can also subscribe and pay for their premium membership which gets you some pretty awesome tutorials, resources, downloads, and premium community support. Some general Wiki information about XNA: http://en.wikipedia.org/wiki/XNA_%28Microsoft%29 Community Support OK. Let's move on to industry and community support. Apart from XNA, there are some really cool sites out there, I just haven't found all of them yet. However, I found a really cool Game Development website called Gamastura. You can click on the following link to get you there: http://www.gamasutra.com/ The site is 100% dedicated to "The Art & Business of Making Games". Armed with blogs, twitter, jobs/resumes and most importantly industry news; one could subscribe to the feed and got lost in the wealth of information it provides. On a side note: I remember Gamasutra being around when my best friend and I wanted to make a video game...meaning, they've been around for a while now. I think the most beneficial aspect of this site is to understand the industry you want to get into. Otherwise, it's just a cool site to keep up to date with the industry in general. Another Community Support option is LinkedIn. Amongst the land of extremely bloated achievements and responsibilities lay 3 groups (that I have found) that deal with game development.: http://www.linkedin.com/groups?gid=59205 - Game Developers http://www.linkedin.com/groups?gid=824817 - DirectX Game Developer Network http://www.linkedin.com/groups?gid=756587 - DirectX Developers The Game Developers group in LinkedIn is by far the most active of the three and could possibly provide a wealth of support. What I've done thus far: - I lightly researched the XNA technology - I looked around for some community sites to assist me - I downloaded the XNA Game Studio 3.1 on my PC and installed it on my IDE - I even tried both tutorials! http://creators.xna.com/en-US/education/gettingstarted/bgintro/chapter1   Best Regards D.

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