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• Help converting java program to MapReduce job

  - by BigJoe714

  Hello, I would like to convert the following Java program to a MapReduce job. I have read about MapReduce and feel like this would be a good problem to solve using it, but I cannot figure out what to do. This basically loops through a directory of html files and parses them into a CSV file. http://www.joeharrison.com/bucket/2010/3/Main.java.txt http://www.joeharrison.com/bucket/2010/3/StringParser.java.txt Note: I am not trying to get someone else to do my work for me. I am using this as a learning experience. This will not be used for $$$profit$$$. If I have something that I created converted to a MapReduce job I feel it will provide a much easier way to learn then trying to follow an arbitrary tutorial. I posted this on Rentacoder several days ago, because I wanted to pay someone to convert it for me. But no one on rentacoder seems to know mapreudce!

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• Database change management tools?

  - by zodeus

  We are currently in the process of solidifying a database change management process. We run MySql 5 running on RedHat 5. I have selected LiquiBase as the tool because it's open source and allows us to expand its functionality later if needed. It also seems to be one of the few free projects that are still active. Has anyone here had any experience using LiquiBase or other Db versioning tools? Company Background: We are an SaaS company providing a 7/24 hosted application. There are dozens of instances running different versions of the same database and we need a way to manage the deploy process as it's starting to get out of control. The databases have hundreds of tables and we typically do releases once every 3 months.

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• Resharper doesn't play well with XAML?

  - by John Weldon

  I've been noticing a pattern with ReSharper (both 4.5 and 5). Very often (almost always) when I have solution-wide analysis turned on, and WPF code in my solution, ReSharper will mark a number of the .xaml.cs files as being broken. When I navigate to the file, sometimes it magically updates and displays no errors, and other times I have to open other files that are not being correctly read and close them again to force resharper to correctly analyze them. I assume it has something to do with the temporary .cs code that is generated with XAML, but does anyone know why this is actually happening, and if there is a work around? Should I just file a bug report with JetBrains? Does anyone else experience this?

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• Reputable geo-ip location Services

  - by Alan Storm

  Who are some of the reputable and/or stable geo-ip location service providers? I'm specing out an application that needs this functionality, and whenever I google geo-ip I get a ton of hits, but it's hard to tell who the legit providers are and who the fly-by-night folks are. Ideally I'd like something that can run without a call to an external API (i.e. regular database updates), but would be interested in hearing about experience with providers who offer live/http services. If it ran in PHP that would be great, but so long as it could run in a *nix environment that's fine. I'd prefer a paid service from a reputable provider than an awesome free service that could vanish tomorrow (free services are welcome, just convince me they're not going to vanish).

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• Robotics Simulator

  - by Arkapravo

  Which is the best robotics simulator ? Player Project (simulator + control interface) Microsoft Robotics Studio (simulator + control interface) KiKS (in Matlab, only for Khepera) MobotSim (for point like robots ) ROS (I have only heard about it) URBI (also, only heard about it) Any other As of now, I am just looking to get simple simulations of Potential Field method, Bug Algorithms, A* Algorithm etc ! This article gives a number of such softwares etc, however I was looking for a first hand view from fellow stackoverflowers. Anyone who has worked with any other software etc is most welcome to share his/her experience !

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• What AMF Servers Support Remote Shared Objects?

  - by GrayB

  Greetings. I'm planning on building a Flex based multiplayer game, and I'm researching what will be required for the server end. I have PHP experience, so I started looking at ZendAMF. Now in this game, I'll need the concept of rooms, and real time updates to clients in those rooms, so it looks like I'll be using remote shared objects (correct, yes?). I'm not seeing where ZendAMF can support this. So I found this page: http://arunbluebrain.wordpress.com/2009/03/04/flex-frameworks-httpcorlanorg/ It seems to indicate that ZendAMF isn't going to do what I want. WebORB for PHP seems to be the only PHP based solution that does messaging, but on that page it doesn't mention "real-time" next to it like the Java based ones below it do. What should I be looking at for the server piece with my requirements? Do I need to make the jump to something like BlazeDS and try to pick up a bit of Java knowledge? Thanks.

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• Product table, many kinds of product, each product has many parameters

  - by StoneHeart

  Hi, i'm have not much experience in table design. My goal is a product table(s), it must design to fix some requirement below: Support many kind of products (TV, Phone, PC, ...). Each kind of product has different set of parameters like: Phone will have Color, Size, Weight, OS... PC will have CPU, HDD, RAM... Set of parameters must be dynamic. You can add or edit any parameter you like. I don't want make a table for each kind of product. So I need help to find a correct solution. Thanks.

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• Relating NP-Complete problems to real world problems

  - by terru

  I have a decent grasp of NP Complete problems; that's not the issue. What I don't have is a good sense of where they turn up in "real" programming. Some (like knapsack and traveling salesman) are obvious, but others don't seem obviously connected to "real" problems. I've had the experience several times of struggling with a difficult problem only to realize it is a well known NP Complete problem that has been researched extensively. If I had recognized the connection more quickly I could have saved quite a bit of time researching existing solutions to my specific problem. Are there any resources (online or print) that specifically connect NP Complete to real world instances?

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• What can I do with Java for Blu Ray or BD-J?

  - by Jay Askren

  I have a Blu Ray player which can connect to the internet to play media from netflix and youtube. I am intrigued by the possibilities of BD-J and wondering just how far the technology can be taken. For instance: Could I write a twitter, facebook, rss reader, or email client? Can I write a game which would allows people to play each other over the web from their own tv? Could I write a DVR app which stored tv shows on the thumbdrive plugged into the player. Can I run my applications from a thumbdrive or do I need to put them on a Blu Ray disk? Does anyone have real experience with BD-J? How do you like it as a development platform? How would you recommend getting started? Can I develop in BD-J using open source tools like Eclipse, Maven, etc...

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• jQuery prevent paste to iframe designmode from MS Word

  - by naugtur

  I've seen some questions on catching the paste event. This looks helpful. But I want to prevent paste on a designmode iframe from happening when the pasted content is not plaintext, but comes from MS Word or other WYSIWYG editor. What is experience on that? I suppose I should catch the event (bind to iframe or to its body?) and look for some specific tags in the clipboard. What content does Internet Explorer add every time? [edit] After doing more research I see there is no easy way to work with clipboard in non Internet Explorer browser except some Flash tricks. I don't want them. How can I detect paste in Firefox and others then?

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• Update {node_counter} table programatically in drupal

  - by wiifm69

  I currently use the statistics module (core) on my Drupal 6 install. This increments a count in the {node_counter} table every time the node is viewed, and this works. My question is - can I programmatically increment this counter as well? I am looking to achieve this when users interact with content created from views (say click a lightbox), so being able to update the table with AJAX would be ideal. I have done a quick search on d.o and there doesn't appear to be any modules that stick out straight away. Does anyone have any experience with this?

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• Touchscreen using sound input?

  - by ricardowong

  Hi, i don't really know if it is actually possible, but i believe that it can be made. How possible is it to make a program that recognizes different sound bouncing from the screen and turn it into a position that will obviously be later fed to the mouse. I know that it sounds kind of dumb, but lately i've been noticing that a very dull, strong sound is made when touching the screen, and that sound varies when doing so at different positions. Probably the microphone "hears" differently because the screen acts as a drum with the casing. Anyways, what do you think, anyone has any experience programming with sound?

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• Django-pyodbc SQL Server/freetds server connection problems on linux

  - by wizard

  Error: ('IM002', '[IM002] [unixODBC][Driver Manager]Data source name not found, and no default driver specified (0) (SQLDriverConnectW)') I'm migrating from developing on a windows development machine to Linux machine in production and I'm having issues with the freetds driver. As far as I can tell that error message means it can't find the driver. I can connect via the cli via sqsh and tsql. I've setup my settings.py as such. 'bc2db': { 'ENGINE': 'sql_server.pyodbc', 'NAME': 'DataTEST', 'USER': 'appuser', 'PASSWORD': 'PASS', 'HOST': 'bc2.domain.com', 'options': { 'driver': 'FreeTDS', } }, Does anyone have any SQL Server experience with django? do I have to use a dns? (how would I format that?)

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• Hex colors: Numeric representation for "transparent"?

  - by Pekka

  I am building a web CMS in which the user can choose colours for certain site elements. I would like to convert all colour values to hex to avoid any further formatting hassle ("rgb(x,y,z)" or named colours). I have found a good JS library for that. The only thing that I can't get into hex is "transparent". I need this when explicitly declaring an element as transparent, which in my experience can be different from not defining any value at all. Does anybody know whether this can be turned into some numeric form? Will I have to set up all processing instances to accept hex values or "transparent"? I can't think of any other way.

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• JAX-WS Consuming web service with WS-Security and WS-Addressing

  - by aurealus

  I'm trying to develop a standalone Java web service client with JAX-WS (Metro) that uses WS-Security with Username Token Authentication (Password digest, nonces and timestamp) and timestamp verification along with WS-Addressing over SSL. The WSDL I have to work with does not define any security policy information. I have been unable to figure out exactly how to add this header information (the correct way to do so) when the WSDL does not contain this information. Most examples I have found using Metro revolve around using Netbeans to automatically generate this from the WSDL which does not help me at all. I have looked into WSIT, XWSS, etc. without much clarity or direction. JBoss WS Metro looked promising not much luck yet there either. Anyone have experience doing this or have suggestions on how to accomplish this task? Even pointing me in the right direction would be helpful. I am not restricted to a specific technology other than it must be Java based.

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• Using XML to generate SAP ABAP and/or SAPScript?

  - by Rob

  Has anyone got examples and/or experience of generating SAP ABAP or SAPScript form code from XML that came from an external application? This would help: creation of SAP-based applications in a data-driven way by automating the knowledge to do so from the export of XML from an external application automated inputting of knowledge from an external application into SAP applications, rather than manually copying between systems enable 3rd-party external tools to be used to create data, perhaps in a more easier-to-use way than could be done in SAP. Or if there was already heavy investment in training with these third party tools rather than SAP, or if the employment market favoured staff with knowledge of these tools enable creation of data for multiple purposes, views: those in SAP and outside SAP. enable inter-operability of SAP with 3rd-party external tools I'm looking for: - experiences as to the feasibility - tools, e.g. parsers, XSLT etc. - examples

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• How can a student programmer improve his teamwork skill?

  - by Turtle

  I am a student right now. Recently, I am working in a project as a leader with three other students. Due to the lack of experience, our project is progressing slowly and our members are frustrated. They do not feel sense of accomplishment in the project. I am pressured and frustrated, too. But as a team leader, I think I need to push them. But I do not know how to do. Do I help them solve coding problem or just encouragement? But if I pay too much attention on it, it would slow down my own progress. It is a not technical question, but it is very common in software development. I hope veteran programmers would give me some suggestions. Thanks!

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• Cross Platform Tips, Tricks & Gotchas

  - by codeelegance

  If you've worked on a cross platform development project: What did you learn from the experience? What worked? What didn't? What problems did you run into and how did you solve them? Did you aim for consistent appearance and functionality across all platforms or try to take advantage of each platform's strengths? What language and cross platform libraries did you use and did they live up to their claims? Was it a desktop application or web-based?

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• Is DataGrid a necessity in WPF?

  - by Jobi Joy

  I have seen a lot of discussions going on and people asking about DataGrid for WPF and complaining about Microsoft for not having one with their WPF framework till date. We know that WPF is a great UI technology and have the Concept of ItemsControl,DataTemplate, etc,etc to make great UX. Even WPF has got a more closely matching control- ListView, which can be easily templated to give better UX than a traditional Datagrid like display. And I would say a readymade DataGrid control will kill or hide a lot of creativity and it surely will decrease the innovations in User Experience field. So what is your opinion about the need of DataGrid in WPF as a Framework component? If you feel it is necessary then is it just because the world is so used to the DatGrid way of data display for many years? Some other threads having the discussion about DatGrid are here and here Link to WPF ToolKit - Latest WPF DatGrid

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• Create creative diagrams or find someone creative

  - by devdude

  This question might be slightly non-techy/dev, but I am sure many of you had a similar problem. We code, write test-cases, put comments in source-code (!), put messages in svn commit, write comments in tracked issues. We create ERD/class/usecase/.. diagrams with whatever tool. We might write user-manuals, wikis, guidelines,.. Not everyones cup of tea, but usually practice makes a good tech writer (I experienced that). Now comes the point: Once in a while we need to supply system overview diagrams, drawings of architecure,.. that look appealing to non-technical people, and no, we dont have a marketing department with designers waiting for our input or a $$$$ design company doing our corporate design. If I try to do that, it a) takes forever b) I might not have the tools and c) looks like crap and not like something I want to see in a slideshow. Whats your experience or recipe ? Is there something like RENT-A-DESIGNER ? cheers

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• Poco SocketReactor Scalability

  - by Genesis

  I have written a proxy server for Linux using Poco but have since been reading up on the various approaches to achieving TCP/IP server scalability. I will need the server to handle persistent connections (not HTTP traffic) with an upper limit of about 250 simultaneous connections. Each connection typically uses about 5-10Kb/sec and the best possible latency in handling traffic is crucial. As it stands I am using the Poco SocketReactor which uses the Reactor model with a select() call at its heart however I have had a read on the C10K problem as well as few other resources and it seems that using this approach might not be the best idea. I believe there is a test implementation in the Poco libs that uses poll() so this could be an option to improve things. Does anyone have any experience using a Poco SocketReactor and do you have any idea how well it might scale for my scenario? If it will not scale well, suggestions on alternatives would be appreciated.

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• How to learn high-level Java web development concepts

  - by titaniumdecoy

  I have some experience writing web applications in Java for class projects. My first project used Servlets and my second, the Stripes framework. However, I feel that I am missing the greater picture of Java web development. I don't really understand the web.xml and context.xml files. I'm not sure what constitutes a Java EE application as opposed to a generic Java web application. I can't figure out how a bean is different from an ordinary Java class (POJO?) and how that differs from an Enterprise Java Bean (EJB). These are just the first few questions I could think of, but there are many more. What is a good way to learn how Java web applications function from the top down rather than simply how to develop an application with a specific framework? (Is there a book for this sort of thing?) Ultimately, I would like to understand Java web applications well enough to write my own framework.

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• Play Framework: Real-world production experiences?

  - by Rob

  Has anyone used the Play framework for a reasonably complex or large, deployed production app yet? If so, I would like to hear what the pros and cons of that experience were and what you might do differently if you could start over. In particular, I'm interested in how well it worked for projects that are big enough that it requires a small team and/or apps that had requirements that go beyond what demo/test projects can (e.g. scalability requirements). The other question on this topic does not cover use in production, and as we all know, the true wins (and gotchas) of platforms often don't show up until used in battle.

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• JVM (embarrasingly) parallel processing libraries/tools

  - by Winterstream

  I am looking for something that will make it easy to run (correctly coded) embarrassingly parallel JVM code on a cluster (so that I can use Clojure + Incanter). I have used Parallel Python in the past to do this. We have a new PBS cluster and our admin will soon set up IPython nodes that use PBS as the backend. Both of these systems make it almost a no-brainer to run certain types of code in a cluster. I made the mistake of using Hadoop in the past (Hadoop is just not suited to the kind of data that I use) - the latency made even small runs execute for 1-2 minutes. Is JPPF or Gridgain better for what I need? Does anyone here have any experience with either? Is there anything else you can recommend?

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• Best practice to display POI in iPhone's MapKit?

  - by iamj4de

  Assuming I have a database of POI with their respective coordinates (longitude & latitude). What would be the "standard" way to display the POI as annotations around the user's current location? To elaborate: Given a zoom level, I guess I have to search through the database for all POI whose distance to the current location < a certain threshold, then create annotations for them. Or is there any smarter way? If the user zooms in/out, moves the map... I will need to redo the whole thing again? It seems that MapKit has a mechanism to cache/reuse annotations. Should I create a lot of them right away and let MapKit decides what to render when the visible region changes? I guess this would make the transition smoother, but also consumes more memory. What is your experience with this? Thanks.

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