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• Hudson - Maven is failing (cannot create /dev/null/.m2) on Tomcat-6 - Gentoo

  - by John

  Hi there. I'm having major issues with getting Hudson up and running on a gentoo server with Tomcat 6. I'm able to deploy Hudson just fine, and I can browse the web-application, configure it and set up builds etc. However, when I try to run a build (in example "clean test" on a Maven2 project) I get this error ERROR: Failed to create /dev/null/.m2 I've google'd and for some it seems to be helping to put -DHUDSON_HOME=/home/hudson and -DMAVEN_HOME=/home/hudson in /etc/init.d/tomcat-6's JAVA_OPTS. However, I've tried that and by doing the same in /etc/conf.d/tomcat-6 , but I'm still getting this error. Has any of you had to deal with this before?

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• Const Functions and Interfaces in C++

  - by 58gh1z

  I'll use the following (trivial) interface as an example: struct IObject { virtual ~IObject() {} virtual std::string GetName() const = 0; virtual void ChangeState() = 0; }; Logic dictates that GetName should be a const member function while ChangeState shouldn't. All code that I've seen so far doesn't follow this logic, though. That is, GetName in the example above wouldn't be marked as a const member function. Is this laziness/carelessness or is there a legitimate reason for this? What are the major cons of me forcing my clients to implement const member functions when they are logically called for?

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• Do you know of a C dictionary that supports COW transactions?

  - by Tim Post

  I'm looking for a key - value dictionary library written in C that supports a theoretically unlimited number of cheap transactions. I'd like to have one dictionary in memory, with hundreds of threads starting transactions, possibly modifying the dictionary, ending (completing) the transaction or potentially aborting the transaction. Only 50% of the time will these threads actually modify the dictionary. Most dictionary transaction implementations that I've seen copy always, instead of copying on write, whenever a transaction is started. Given the expected size ( 1GB) of the dictionary, I'm hoping to find something that COWs only when something is actually changed during a transaction. I'm also hoping for something that is packaged by most major GNU/Linux distributions. Any suggestions or links are very much appreciated.

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• What do the external JSF libraries/frameworks add?

  - by kgrad

  I have seen mention of a bunch of external JSF Libraries such as ICEfaces, Richfaces, etc. However, I am unsure as to what these libraries actually add over just using JSF 2.0. Are they just additional components that are pre-built? I know that PrettyFaces adds URL rewriting, and I Believe that ICEFaces/Richfaces add Ajax enabled components? What are some other major component libraries, what are their benefits / why should people use them? Additionally, what does a framework like SEAM add over using straight JSF2 with EJB? Is MYFaces simply a different implementation of JSF?

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• What is this Hash-like/Tree-like Construct Called?

  - by viatropos

  I want to create a "Config" class that acts somewhere between a hash and a tree. It's just for storing global values, which can have a context. Here's how I use it: Config.get("root.parent.child_b") #=> "value" Here's what the class might look like: class Construct def get(path) # split path by "." # search tree for nodes end def set(key, value) # split path by "." # create tree node if necessary # set tree value end def tree { :root => { :parent => { :child_a => "value", :child_b => "another value" }, :another_parent => { :something => { :nesting => "goes on and on" } } } } end end Is there a name for this kind of thing, somewhere between Hash and Tree (not a Computer Science major)? Basically a hash-like interface to a tree.

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• [WiX] Is there a way to create a patch that is identical to doing a full install of the newer versio

  - by Davy8

  I'm trying to create patches using the method from this tutorial. An issue I'm running into is that I can't install a new patch on top of a previous patch. I can full install Version A,then patch to Version B. After that I can't patch to Version C. I can full install Version B, then patch to Version C. Currently we just do full installs with major updates each time which is working fine, but because of the frequency of our (internal) updates the file size and update time is becoming a burden so we're looking to reduce the update time (both downloading and installing) especially when most of the files don't change.

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• How do I secure password parameters in RESTful web service URIs?

  - by adam

  i'm a newbie to server-side programming, so please forgive me if this gets messy. i've been contracted to create a web service to allow authenticated users to access a database. users have to enter a login and password. been reading and reading about REST vs SOAP, and i thought i'd settled on a RESTful design when i came across this statement: "Data that needs to be secure should not be sent as parameters in URIs." this seems like a major demerit against a RESTful approach. i'm aware that with https the password would be encrypted to prevent man-in-the-middle interception, but that leaves the server logs and client history as possible exposure points. is there a RESTful solution out there for this problem, or do i need to go SOAPy? any advice appreciated.

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• Is there a unified way to know if a node is visible or not?

  - by zneak

  Hello guys, I'd like to be able to know if a node is visible and rendered on screen. As far as I know, there are at least 3 standard and easy ways of making HTML nodes not visible: Setting opacity: 0; Setting display: none; Setting visibility: hidden. I could check for just these three, but I'm afraid people can get creative when it comes to ways of hiding contents: Sending the element offscreen using negative margins; Using a width or height of 0 and hiding overflow; many more I trust people to have developed. So I was wondering if there is a standard way of determining if a node is rendered to the screen. I'm pretty sure all major browsers determine it for themselves to accelerate drawing, so maybe it's somehow exposed.

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• Use of bit-torrent for large file download as an alternative to FTP

  - by questzen

  The company I work for procures large volumes of data and does this by subscribing to FTP locations. I was wondering if it is possible to download the same using a tracker, the major challenge is authentication of the users IMO. Most ftp servers we subscribe to have a restriction of the number of ftp connection attempts. Does any one here have any experience with this? Any advice is welcome. Edit To clarify, we subscribe to third party vendors and access their ftp location using credentials provided by them. The service is not exclusive to us, they do sell their data to several others. If we could be part of the swarm, the download rates would be pretty high without added penalty. The question is about the possibility of achieving this, so that we can put-forth a proposal in those lines. The vendors obviously wouldn't share data to non-subscribers, so that is a constraint.

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• while(0=0) evaluates to false

  - by paque

  b=10; while(a=b) { b--; if(b==-10)break; } B goes from 10 to -10. In my world, the while-statement, a=b, should always be true (since the assigment always "goes well"). That is not the case. When the loop stops, b will have a value of 0. In my world, it should pass 0 and go all the way to -10, when the if-statement kicks in. Have I misunderstood something major? (Code tested in IE8 and Adobe Acrobat)

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• Unable to publish files in SharePoint

  - by iHeartDucks

  When I publish a file from code byte[] fileBytes = objItem.File.OpenBinary(); string DestinationURL = string.Format(@"{0}/{1}", objDestinationFolder.Url, objItem.File.Name); //Copy the file. SPFile objDestinationFile = objDestinationFolder.Files.Add(DestinationURL, fileBytes, true); objDestinationFile.Update(); objDestinationFile.Publish(string.Format("File Copied from {0}", objItem.Url)); I get an error message which says You can only publish, unpublish documents in a minor version enabled list Ii checked the permissions of the list and it has "Create major and minor (draft) versions" checked. Any ideas?

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• What is the best way to automated (integration) test with java with OpenId4Java against real OpenIdP

  - by mP

  I would like to do a bit more than manually test my openid glue code which happens to use the openid4java library. My goals would be to be able to run it within my IDE with a bunch of tests using Junit or similar. Selenium & tomcat I was thinking of using selenium and a tomcat but thats not exactly a nice approach as this is a bit heavy and not really lightweight. httpunit A solution with http-unit is incomplete because it doesnt really fit with the redirect to my openid provider, authenticate and redirect back. Perhaps i am wrong but this looks like it could get quite involved just to make sure this works. Mocks My last solution is to mock everything and assume thats its accurate and works. If google or yahoo ever change in some way, then ill have to verify manually. The approach is simple but with a major flaw.

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• Does anyone know of a good script to force file downloads and yet protect download links on a PHP se

  - by racl101

  I tried using a free script that I found on the Internet but it is giving me problems with Windows users (even though they are using IE 8, so it's not an option for me to ask them to upgrade their browsers.) Here's the requirements: I have a bunch of Microsoft Word and pdf files that need to be protected so that only authorized users can download them. I have already created the login system and the current script I have works fine for non-IE browsers. However, I keep getting recurring problems with Windows users who keep complaining that their files download corrupt and yet everyone else either using Mac or Linux or any other browser gets on just fine. The script must allow me to store files in a directory but force download of the file upon the function call. Must work well with most major browsers, especially I.E. If you have any practice suggestions or know of any great scripts (even if they are paid, I'm sick of this problem and would probably pay for a paid script) it would be greatly appreciated in advance.

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• Credit Card checksums and validations that do not require connection to the financial institution

  - by cjavapro

  The validations I know of are: Checksum the whole card number should add up to zero. (range is 0-9) Check the first digit(s) against the card type Check the length against the card type Check the CCV length against the card type (I think all the major types are 3 anyway) Of course make sure it is accepted card type as well as non expired. Are there any other validations :) (I expect many folks did not know about all of these) The reason I ask is because I overheard there was one to checksum number against expiration or CCV.. I just wanted to check.

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• how can I "force" a branch upon the trunk, in the case I can't "reintegrate"?

  - by davka

  We created a branch from the trunk on which a major refactoring was done. Meanwhile, the trunk advanced a few revisions with some fixes. We don't want these changes on the branch, so we don't want to "catch-up" merge the trunk to the branch, because we don't want to mix the old and new code. But without this I can't reintegrate the branch back to the trunk. Is there a way to impose the branch on the trunk "as-is"? (an idea I considered is to undo ("reverse-merge") the trunk back to the revision where the branch started, and then it is safe to merge it on branch - nothing should happen. Then I can reintegrate. What do you think?) thanks!

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• How can I avoid causing memory leaks in Firefox?

  - by mrdanimal

  It seems that there is a lot of information on memory leaks in IE and how web developers can avoid them, but I can't find much on avoiding leaks in FF. I've found lots of random tips on how end users can tweak their preferences, or tips for extension developers, but little on what I can do as a web developer to make sure my pages don't leak. Am I missing something? It seems lazy to just blame it on the user and say "you've got too many extensions". Or are the major patterns the same as in IE -- circular references and all that? Also, if anyone knows of any tools to troubleshoot leaks in FF, that would be great. I found this: https://addons.mozilla.org/en-US/firefox/addon/2490/ But it's apparently just for chrome and extension development.

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• Is Microsoft CCR gaining any traction?

  - by spender

  Microsoft's Concurrency and Coordination Runtime quite literally saved a project that was running into major issues with deadlocking. Since then I find that I use it more and more frequently for almost anything that requires asynchronous coding producing results that run lighter and faster than before. I can honestly state that it has transformed the way I think about multithread/multicore dev. Despite my personal love for CCR, there appears to be very little buzz surrounding it on the web and was wondering if anyone can offer any reason for this. Are there better alternatives, or is it a lack of promotion from MS, or are people simply happy with the existing tools?

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• mysqli::query returns true on SELECT statement

  - by Travis Pessetto

  I have an application that reads in one of its classes: public function __construct() { global $config; //Establish a connection to the database and get results set $this->db = new Database("localhost",$config["dbuser"],$config["dbpass"],"student"); $this->records = $this->db->query("SELECT * FROM major") or die("ERROR: ".$this->db->error); echo "<pre>".var_dump($this->records)."</pre>"; } My problem is that var_dump shows that $this->records is a boolean. I've read the documentation and see that the SELECT query should return a result set. This is the only query used by the application. Any ideas where I am going wrong?

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• PHP Magento Screen Scraping

  - by Grant unwin

  I am trying to scrape a suppliers magento site in an effort to save some time because of there being around 2000 products I need to gather info for. I'm totally OK with writing a screen scraper for pretty much anything but i've encountered a major problem. Im using get_file_contentsto gather the html of the product page. The problem is: You need to be logged in, to view the product page. Its a standard magento login, so how can I get round this in my screen scraper? I don't require a full script, just advice on a method. Thanks

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• Show me some cool python list comprehensions

  - by christangrant

  One of the major strengths of python and a few other (functional) programming languages are the list comprehension. They allow programmers to write complex expressions in 1 line. They may be confusing at first but if one gets used to the syntax, it is much better than nested complicated for loops. With that said, please share with me some of the coolest uses of list comprehensions. (By cool, I just mean useful) It could be for some programming contest, or a production system. For example: To do the transpose of a matrix mat >>> mat = [ ... [1, 2, 3], ... [4, 5, 6], ... [7, 8, 9], ... ] >>> [[row[i] for row in mat] for i in [0, 1, 2]] [[1, 4, 7], [2, 5, 8], [3, 6, 9]] Please include a description of the expression and where it was used (if possible).

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• Using Jquery to check if a URL is valid

  - by user102533

  A long running background process creates a text file to indicate the completion of the process. From the frontend, I'd need to check every few seconds if the text file has been created or not. I am doing this check from However the file is created in http://DomainB.com/Mytext.txt Can someone help me write a jquery script that checks for a file across domain? PS: Currently, I am doing a ajax postback that executes a WebMethod in ASP.NET that creates HttpWebRequest. This works functionally, but I have major performance problems. So, I need a light weight way of finding if a URL is valid or not.

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• What are 3 C++ language features you expect AFTER C++0x?

  - by Vicente Botet Escriba

  If I have understood well C++0x is now on a phase to resolve pending issues, so no new features will be added. What I want to know is what new features you want to have in C++ after C++0x is released. Just to give you an idea, I have added major existing proposal that could be included after C++0x: Concepts, Contract Programming, Garbage Collection, Macro scopes, Modules, Multimethods, Reflection Answer with your favorite feature if not already in an answer and up-vote them if already present. Be free to add other features not included on this list. Please don't include here libraries. Only core language features.

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• Does MVC replace traditional manually created BLL?

  - by used2could

  I'm used to creating the UI, BLL, DAL by hand (some times I've used LINQ-to-SQL or SubSonic for the DAL). I've done several small projects using MVC since its release. On these projects I've still continued to write a BLL and DAL by hand and then incorporate those into the MVC's models/controllers. I'm looking to optimize my time on projects this seems like overkill and a potential waste of time. Question Would it be acceptable to roll a DAL such as SubSonic and directly use it in the Models/Controllers of my MVC web app? Now the models & controllers would act as the BLL. I just see this as a major timesaver to not have to worry about another tier. UPDATE: I just wanted to add that my concern isn't really with the DAL (I frequently use SubSonic and NH) but rather focus on the BLL. Sorry for the confusion.

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• Python: Best practice for including a version number in an app?

  - by Ben

  I have a PyQt application that reads and writes data files. I am including a 'version number' in each file written. This is a simple number similar to: 1.2 or something (major and minor versions). I am doing this so that I can change the format of these data files in future versions and then still correctly parse them simply by checking to see what the version is inside the file. My question is what is the best practice for keeping this number stored inside the app itself. I.e. do I just hard-code the app version number into the class that is responsible for reading and writing files? Or should I have some sort of object/variable stored at the top-level of the app and somehow access it from the class responsible for reading and writing these files. If the latter, how do I store it and how do I access it? Thanks.

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• How to implement a book preview (2 page spread) without using Flash?

  - by littlejim84

  I'm looking into a solution for work, where you have a two page spread of the book to preview. Either side of this, you can hover in the corner to create a pseudo-flip and then click the mouse button to actually turn the page. I know there is many Flash solutions out there, but in this case we cannot use it... So we are looking for a possible solution that can work across all major browsers (yes, including IE6)... I looked a few canvas solutions, but with Google's canvas extension for IE, these will terribly slow. So was thinking about an SVG/VML solution, like Raphael Javascript library. This could be good, but then trying to look into how to code this, without examples, could be a challenge with the time constraint. Is there a solution out there that fits (or almost fits) this problem?

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