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  • Basic Java Multi-Threading Question

    - by Veered
    When an object is instantiated in Java, is it bound to the thread that instantiated in? Because when I anonymously implement an interface in one thread, and pass it to another thread to be run, all of its methods are run in the original thread. If they are bound to their creation thread, is there anyway to create an object that will run in whatever thread calls it?

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  • User Acceptance Testing Defect Classification when developing for an outside client

    - by DannyC
    I am involved in a large development project in which we (a very small start up) are developing for an outside client (a very large company). We recently received their first output from UAT testing of a fairly small iteration, which listed 12 'defects', triaged into three categories : Low, Medium and High. The issue we have is around whether everything in this list should be recorded as a 'defect' - some of the issues they found would be better described as refinements, or even 'nice-to-haves', and some we think are not defects at all. They client's QA lead says that it is standard for them to label every issues they identify as a defect, however, we are a bit uncomfortable about this. Whilst the relationship is good, we don't see a huge problem with this, but we are concerned that, if the relationship suffers in the future, these lists of 'defects' could prove costly for us. We don't want to come across as being difficult, or taking things too personally here, and we are happy to make all of the changes identified, however we are a bit concerned especially as there is a uneven power balance at play in our relationship. Are we being paranoid here? Or could we be setting ourselves up for problems down the line by agreeing to this classification?

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  • How to remove the graphical user interface?

    - by Praveen Kumar
    Ok my question is that, I want to run a heavy application, on a Virtual Machine (VirtualBox) with just 2 GB RAM (Windows 7 32Bit Host has 4 GB, 3.5 GB effective). Initially I thought of installing Ubuntu Server 12.04.1, which doesn't come with a GUI, so I thought it would be efficient in performance, but I have only Ubuntu 12.04 Desktop. My question is, is it possible to remove the GUI parts in Ubuntu 12.04 Desktop (Not Server), keeping only the core OS, after installation in a virtual machine? Or, is there anyway to improve the performance of the OS? If you need more information, I am ready to provide. I don't want the GUI or anything, even a small terminal window is fine for me, I can access files through FTP.

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  • install software in linux as a non root user

    - by Aki
    Hi, What is the best way to install software in a linux machine if you dont have root permissions. I know that we can use few variables like PKG_CONFIG_PATH and switches like --prefix with configure to get a software installed in a local directory, but sometimes when there are recursive dependencies it is becoming tough for me to install all the packages manually. Is there a better automated way? Update: What i meant by recursive dependencies is: to install package A, i should install package B, which in turn requires package C to be installed

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  • Exception Handling And Other Contentious Political Topics

    - by Justin Jones
    So about three years ago, around the time of my last blog post, I promised a friend I would write this post. Keeping promises is a good thing, and this is my first step towards easing back into regular blogging. I fully expect him to return from Pennsylvania to buy me a beer over this. However, it’s been an… ahem… eventful three years or so, and blogging, unfortunately, got pushed to the back burner on my priority list, along with a few other career minded activities. Now that the personal drama of the past three years is more or less resolved, it’s time to put a few things back on the front burner. What I consider to be proper exception handling practices is relatively well known these days. There are plenty of blog posts out there already on this topic which more or less echo my opinions on this topic. I’ll try to include a few links at the bottom of the post. Several years ago I had an argument with a co-worker who posited that exceptions should be caught at every level and logged. This might seem like sanity on the surface, but the resulting error log looked something like this: Error: System.SomeException Followed by small stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace. Error: System.SomeException Followed by slightly bigger stack trace.   These were all the same exception. The problem with this approach is that the error log, if you run any kind of analytics on in, becomes skewed depending on how far up the stack trace your exception was thrown. To mitigate this problem, we came up with the concept of the “PreLoggedException”. Basically, we would log the exception at the very top level and subsequently throw the exception back up the stack encapsulated in this pre-logged type, which our logging system knew to ignore. Now the error log looked like this: Error: System.SomeException Followed by small stack trace. Much cleaner, right? Well, there’s still a problem. When your exception happens in production and you go about trying to figure out what happened, you’ve lost more or less all context for where and how this exception was thrown, because all you really know is what method it was thrown in, but really nothing about who was calling the method or why. What gives you this clue is the entire stack trace, which we’re losing here. I believe that was further mitigated by having the logging system pull a system stack trace and add it to the log entry, but what you’re actually getting is the stack for how you got to the logging code. You’re still losing context about the actual error. Not to mention you’re executing a whole slew of catch blocks which are sloooooooowwwww……… In other words, we started with a bad idea and kept band-aiding it until it didn’t suck quite so bad. When I argued for not catching exceptions at every level but rather catching them following a certain set of rules, my co-worker warned me “do yourself a favor, never express that view in any future interviews.” I suppose this is my ultimate dismissal of that advice, but I’m not too worried. My approach for exception handling follows three basic rules: Only catch an exception if 1. You can do something about it. 2. You can add useful information to it. 3. You’re at an application boundary. Here’s what that means: 1. Only catch an exception if you can do something about it. We’ll start with a trivial example of a login system that uses a file. Please, never actually do this in production code, it’s just concocted example. So if our code goes to open a file and the file isn’t there, we get a FileNotFound exception. If the calling code doesn’t know what to do with this, it should bubble up. However, if we know how to create the file from scratch we can create the file and continue on our merry way. When you run into situations like this though, What should really run through your head is “How can I avoid handling an exception at all?” In this case, it’s a trivial matter to simply check for the existence of the file before trying to open it. If we detect that the file isn’t there, we can accomplish the same thing without having to handle in in a catch block. 2. Only catch an exception if you can do something about it. Continuing with the poorly thought out file based login system we contrived in part 1, if the code calls a Login(…) method and the FileNotFound exception is thrown higher up the stack, the code that calls Login must account for a FileNotFound exception. This is kind of counterintuitive because the calling code should not need to know the internals of the Login method, and the data file is an implementation detail. What makes more sense, assuming that we didn’t implement any of the good advice from step 1, is for Login to catch the FileNotFound exception and wrap it in a new exception. For argument’s sake we’ll say LoginSystemFailureException. (Sorry, couldn’t think of anything better at the moment.) This gives us two stack traces, preserving the original stack trace in the inner exception, and also is much more informative to the calling code. 3. Only catch an exception if you’re at an application boundary. At some point we have to catch all the exceptions, even the ones we don’t know what to do with. WinForms, ASP.Net, and most other UI technologies have some kind of built in mechanism for catching unhandled exceptions without fatally terminating the application. It’s still a good idea to somehow gracefully exit the application in this case if possible though, because you can no longer be sure what state your application is in, but nothing annoys a user more than an application just exploding. These unhandled exceptions need to be logged, and this is a good place to catch them. Ideally you never want this option to be exercised, but code as though it will be. When you log these exceptions, give them a “Fatal” status (e.g. Log4Net) and make sure these bugs get handled in your next release. That’s it in a nutshell. If you do it right each exception will only get logged once and with the largest stack trace possible which will make those 2am emergency severity 1 debugging sessions much shorter and less frustrating. Here’s a few people who also have interesting things to say on this topic:  http://blogs.msdn.com/b/ericlippert/archive/2008/09/10/vexing-exceptions.aspx http://www.codeproject.com/Articles/9538/Exception-Handling-Best-Practices-in-NET I know there’s more but I can’t find them at the moment.

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  • Great User Group if based near Gloucester + Links from Entity Framework 4.0 session

    - by Eric Nelson
    I had a really fun evening doing “my final” EF 4.0 session last night (26th May 2010) at GL.NET based out of Gloucester (although secretly I made it into a IronRuby and Windows Azure session). They are a great crowd and Jimmy makes for a fantastic host + it is a very nice venue (Symantec offices in Gloucester, lots of parking, good room etc) + free pizza + free SWAG + trip to pub afterwards (the topics were very varied!). What more could you ask for? The next session is June 16th and will be on multi-tenanted ASP.NET MVC and comes highly recommended. Links from my session: Entity Framework 4 Resources http://bit.ly/ef4resources Entity Framework Team Blog http://blogs.msdn.com/adonet Entity Framework Design Blog http://blogs.msdn.com/efdesign/ The must have LINQPad http://www.linqpad.net Entity Framework Profile http://efprof.com/  IronRuby info on my blog http://geekswithblogs.net/iupdateable/category/10076.aspx

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  • Creating user UI using Flixel

    - by Jamie Read
    I am new to game development but familiar with programming languages. I have started using Flixel and have a working Breakout game with score and lives. What I am trying to do is add a Start Screen before actually loading the game. I have a create function that adds all the game elements to the stage: override public function create():void // all game elements { How can I add this pre-load Start Screen? I'm not sure if I have to add in the code to this create function or somewhere else and what code to actually add. Eventually I would also like to add saving, loading, options and upgrades too. So any advice with that would be great. Here is my main game.as: package { import org.flixel.*; public class Game extends FlxGame { private const resolution:FlxPoint = new FlxPoint(640, 480); private const zoom:uint = 2; private const fps:uint = 60; public function Game() { super(resolution.x / zoom, resolution.y / zoom, PlayState, zoom); FlxG.flashFramerate = fps; } } } Thanks.

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  • Securely automount encrypted drive at user login

    - by Tom Brossman
    An encrypted /home directory gets mounted automatically for me when I log in. I have a second internal hard drive that I've formatted and encrypted with Disk Utility. I want it to be automatically mounted when I login, just like my encrypted /home directory is. How do I do this? There are several very similar questions here, but the answers don't apply to my situation. It might be best to close/merge my question here and edit the second one below, but I think it may have been abandoned (and therefore never to be marked as accepted). This solution isn't a secure method, it circumvents the encryption. This one requires editing fstab, which necessitates entering an additional password at boot. It's not automatic like mounting /home. This question is very similar, but does not apply to an encrypted drive. The solution won't work for my needs. Here is one but it's for NTFS drives, mine is ext4. I can re-format and re-encrypt the second drive if a solution requires this. I've got all the data backed up elsewhere.

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  • User directory in PATH in zsh: ~ Does Not Work

    - by Yar
    I'm doing this in my .zshrc PATH="~/scripts:$PATH" and if I do echo $PATH it appears as the first thing in the path. Yet this directory isn't included in the executable path (nor for tab-completion). What am I doing wrong? ls ~/scripts shows the directory as expected. Edit: This works, though... I guess ~ doesn't work in the path? #PATH="~/scripts:$PATH" PATH="/Users/yar/scripts:$PATH"

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  • programm and user data from an old hdd to a new installation on ssd

    - by hans wurst
    i tried everything since days, now i ask. i got a ubuntu system on my old hdd, wich is connectet via usb to this system and a sdd is build in my notebook. at the moment i am running a ubuntusystem from an usb stick. it have tried to clone my disk(cahnge uiid, etc), to transport the data via deja dup and much more. the result was nothing or strange things. my idea is to copy the important data form the old system to the new(home and whatever), but it is not allowed to do this. somebody her who know a tool wich can do this, or got an an other idea.

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  • How to manage product backlog/user stories

    - by Andrew Stephens
    We're about to start a new project using Agile (using TFS), and I have a couple of "good practice" questions regarding the product backlog:- When we first start adding users stories, is it a good idea to put them in (say) a "Backlog" iteration, or just leave their iteration blank? Obviously when the time comes to start work on a US it would be moved into the appropriate iteration backlog. When breaking an epic down into smaller USs, would I simply close the original epic, as it's no longer required? Or should I create the new USs as children of the epic? (it's then someone's responsibility to close the epic once all child USs have been completed). Lastly, should the product backlog list all USs regardless of status, or only those that have not been started (i.e in my proposed "Backlog" iteration)? I realise these questions aren't life-or-death, but it would be nice to know how other people manage their product backlogs so we can organise things properly from the start.

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  • How to force user to use subdomain?

    - by David Stockinger
    I am hosting a webshop with OpenCart and its current URL is e.g. http://mydomain.com/shop/ I have created two subdomains ( http://pg.mydomain.com/ and http://shop.mydomain.com/ ) and both subdomains are already working as they should. However, can I restrict direct access to mydomain.com/shop/ while leaving all the files (index.php, etc.) there? Since both subdomains are pointing to http://mydomain.com/shop/, I thought this would restrict all access. So in the end, I would like my two shops to be accessable through http://pg.mydomain.com/ and http://shop.mydomain.com/, but not http://mydomain.com/shop/ while leaving all the files in http://mydomain.com/shop/.

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  • Skype Sticks a Thumb in their User's Eye

    <b>Jamie's Random Musings:</b> "...Skype-to-Skype calls will "always be free". Well, it turns out that promise is worth exactly as much as any other promise Skype has ever made, or will ever make for that matter. A big, fat nothing."

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  • Toronto SharePoint User Group: Tonight Cancelled, Next Meeting: June 16

    - by erobillard
    Apologies all, notification was to go out sooner but apparently we're having technical difficulties so please help spread the word: The May meeting (tonight) is cancelled, leaving you free to enjoy the summery Toronto evening. Enjoy! Next month on Wednesday, June 16 , TSPUG is back with not one, but two , count'em two presentations: First up will be Matthew Pakula from AvePoint talking about their terrific tools for MOSS 2007 and SPS 2010. Then I will reveal the secret toolkit I use to help companies...(read more)

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  • Too many connections RealityRP Emulator

    - by Chase Robinson
    I've been having a problem with the stability of my role play emulator, every now and then, after awhile of using a command such as :shoot x , it will disconnect due to too many connections, or it will disconnect when people are messaging etc.. I've debugged it, and ran while playing it, it disconnected with the Too Many Connections error, Connection.Open(); Is the code that is causing the issue, how do i fix this?

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  • Excel 2007 user warning when opening xls files

    - by J Angwenyi
    I am getting the following error warning when opening an xls file generated using 'CarlosAg.ExcelXmlWriter.dll' using Excel 2007 The file you are trying to open,'', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now? Any idea how to resolve?

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  • Stacks in C++

    - by MarkPearl
    So some more basics… One of the things you will be taught at any college after conquering arrays is different derivatives of collections. Stack is one of the simplest of those and very useful… A stack is a LIFO (last in first out) data structure and has at least two basic method calls – push & pop. Push, “pushes” an item on the top of the stack. Pop, removes the top most item off the stack. Because all elements on a stack are of the same type, one can use an array to implement a stack or a linked list. With the array based approach, the first element in a stack would be the first element in the array, the second on the stack would be the second on the array, etc. One limitation with an array implementation of a stack is that unless the array is dynamic, one would have to have a preset max stack size (based on the bounds of the array). Linked lists is another approach that gets past this boundary by allowing you to dynamically grow or shrink a collection of data. Stacks have many applications… a typical computer science example would be Postfix Expression Calculator, where the LIFO principle is maintained.

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  • udev hide partition in nautilus for specific user/group

    - by user64780
    I'm trying to hide a partition form a specific group of users in Ubuntu 12.04. I have created a new rule in /etc/udev/rules.d/99-hide-disk.rules with KERNEL="sda3",ENV{UDISKS_PRESENTATION_HIDE}="1" And this works for all users. I tried KERNEL="sda3",ENV{UDISKS_PRESENTATION_HIDE}="1",GROUP="adm",MODE:="0700 but the partition is still hidden. That changes the group and permissions on the device rather than the rule. How do I make the rule only apply to a particular group of users?

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  • Frustration with superuser.com user interface (please migrate this to "meta")

    - by Randolf Richardson
    Can someone please migrate this question to "meta" for me? I'm unable to post there while I wait for OpenID to fix my password problems. Thanks. I'm having problems with superuser.com's interface -- when I provide an answer to a question, sometimes the buttons get locked and then I find out that the question was migrated. Usually I can go back and copy-and-paste my answer at whatever site it goes to, but on occasion my answer is lost and I have to re-type it. This is very time-consuming, and makes it quite frustrating to use the system. In addition, I find that I'm wasting a lot of time dealing with having to re-register on the other sites. My suggestion is to not de-activate the "Submit answer" button but to just forward that along to the migrated site automatically, thus ensuring that answers that people put a lot of effort into don't get lost. Thanks in advance.

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  • Share one monitor with another user and display their screen as well

    - by Xiong Chiamiov
    My housemate and I just started playing the original RollerCoaster Tycoon again - what a nostalgia trip! Anyways, we both have two monitors, and would like to view the other's game on the secondary monitor while playing, since we're in different rooms. VNC-like applications sorta work, but they require two separate instances running (one to share each direction), and as a whole are rather slow and clumsy. We don't need any remote control at all, just viewing. I'm using XP, he Win7. We could probably get it to run through some means in Linux, if necessary.

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  • User eXperience

    - by Daniel Moth
    The last few months I have been spending a lot of time designing (and help design) the developer experience for the areas I contribute to (in future versions of Visual Studio). As a technical person who defines feature sets, it is easy to get engulfed in the pure technical side of things and ignore the details that ultimately make users "love" using the product to achieve their goal, instead of just "having to use" it. Engaging in UX design helps me escape that trap. In case you are also interested in the UX side of development, I thought I'd share an interesting site I came across: UX myths. In particular, I recommend reading myths 9, 10, 12, 13, 14, 15 and 21. Let me know if there are other UX resources you recommend… Comments about this post welcome at the original blog.

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