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• Why does java have an interpreter? and not a compiler?

  - by Galaxin

  Iam a newbie to java and was wondering why java have a interpreter and not a compiler? While shifting from c++ to java we come across the differences between these two Compilation process being one of them. 1.A major difference between a compiler and interpreter is that compiler compiles the whole code at once and displays all the errors at a time whereas an interpreter interprets line by line. 2.Also a compiler takes a less time to compile a code when compared to an interpreter. When java was developed for more advanced and easy features and implementations why has it been restricted to a interpreter based on above facts? Is there any special reason why this is so? If yes what is it?

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• the breakpoint will not currently be hit no symbols loaded

  - by Carlos_Liu

  I want to debug on the customer's machine (Windows Server 2003) to track a problem, and out product is based on .NET 2.0. I want to use DbgCLR.exe to debug a file AAA.dll, what I did is: install .NET 2.0 SDK on the customer's machine (to get the DbgCLR.exe) copy the symbol file AAA.pdb to the same directory with AAA.dll get the source file for AAA.dll the AAA.dll will be loaded by w3wp.exe, so in the DbgCLR Tools-Attach to Process, then I choose w3wp.exe File-Open-File open the source file and add a breakpoint in the function which will be callled but the breakpoint seems do no work because there is an warning icon on it and says : the breakpoint will not currently be hit. No symbols have been loaded for this document. On my computer (Windows XP) which has the debug version of whole source code, I did nearly the same thing as above but the different is: I attached aspnet_wp.exe to do the debug and it works What should I do to let it work on the customer's machine?

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• Maven archetype from project - how to preserve package names ?

  - by lisak

  Hey, I'm trying to grab my project and generate an Archetype from it via : archetype:create-from-project The thing is, that my project has src/main/java package structure com.sample.app, but the archetype must have it as I want (org.example.game) ... Ideally as user want when generating the project from archetype, but that is impossible I suppose. It would have to grab groupId and artifactId and generate archetype-resources/src/main/java based on this input. Anyway, that's why there is this argument I suppose : packageName mvn archetype:create-from-project -DpackageName=org.example.game But it doesn't work and there is still archetype-resources/src/main/java/org/sample/game ..

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• VST plugin : using FFT on audio input buffer with arbitrary size, how ?

  - by Led

  I'm getting interested in programming a VST plugin, and I have a basic knowledge of audio dsp's and FFT's. I'd like to use VST.Net, and I'm wondering how to implement an FFT-based effect. The process-code looks like public override void Process(VstAudioBuffer[] inChannels, VstAudioBuffer[] outChannels) If I'm correct, normally the FFT would be applied on the input, some processing would be done on the FFT'd data, and then an inverse-FFT would create the processed soundbuffer. But since the FFT works on a specified buffersize that will most probably be different then the (arbitrary) amount of input/output-samples, how would you handle this ?

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• Passing arguments from loading activity to main activity

  - by ZelluX

  I'm writing an application that starts with a loading activity. In the loading activity the app requests html from web and parses the html, then it sends the parsing result to the main activity. The main activity has several tabs, and contents of these tabs are based on the result of parsing. For example, the result of parsing is a list of strings ["apple", "banana", "orange"], and I need to pass this list to main activity, so that the main activity can create three tabs named after three fruits. I would like to know if there is any way to pass a list of strings among activities, BTW, is it the common way of do this? Many thanks.

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• Mysql retrieve polygon data

  - by dskanth

  Hi, i have been developing a site that stores spatial data in mysql database, like that of buildings, gardens, etc. in the form of polygons (latitudes and longitudes). I want to know how to retrieve polygon data in mysql. I have seen this sample query to insert a polygon data: http://amper.110mb.com/SPAT/mysql_initgeometry2.htm But now i want to know how to retrieve data from the table, based on certain constraints like: "where latitude < 9.33 and longitude > 22.4" Also how do i find whether a point lies inside or outside of a polygon

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• Drupal CCK Text field not saving.

  - by Mark Milbourne

  Hey Guys, I've been trying to write a CCK Field based on the Text field. But if I create a standard CCK Text field with only 1 value. Then edit a content item for this type, the values are never persisted. When I go back in and edit the same node, the value isn't there. I checked the database and its not in the table for the CCK node. If I use more than one value it works fine. I'm upto date on CCK (6.x-2.6) and CTools (6.x-1.5). Has anyone seen this? and a possible solution?

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• What technology to use for a RIA

  - by user297159

  I have to develop a online business software solution (similar to ERP) for a company to manage the information exchange for internal use and with external partners. It should be online. What technology should I use, I have checked framewroks like: Flex, Silverlight, Google/GWT, sencha (ExtJS), jQuery, DoJo, Telereik, Infrajistics and others similar. But they seam to be very low level programming. May be this is advantage for other projects, where you need more flexibility, but this project is stright forward. I need something more focused on business software (tables, forms, processes) where and eventually more efficient with less coding, or something I can save time. Is force.com an option? But I can not install this on the customer's servers... Do you have any ideas for me for a web based framework focused on business applications?

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• Please Recommend CS Project books

  - by kunjaan

  Programming Collective Intelligence is an awesome way to get your feet wet in Machine learning. I am looking for similar books which has small but interesting programming projects. Do you have any recommendations? Edit: It need not be related to machine learning. It could be any programming project-based books. Thanks. Edit2: Collective Intelligence in Action is one more book that looks at some interesting CS stuffs. Do you guys have any similar recommendations?

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• python streaming TCP server with RPC

  - by Noah

  I have written a little streaming mp3 server in python. So far all it does is accept a ServerSocket connection, and begin streaming all mp3 data in its queue to the request using socket.send(). I have implemented this to chunk in stream icy metadata, so the name of the playing song shows up in the client. I would like to add playlist management to the server, so that I can manipulate the playlist of the running server. I have a vague idea that xmlrpclib would be suited to doing this, but I'm confused about one thing: When I start the server it listens on port N. The python xmlrpclib examples involve creating a socket and listening for requests. So my question is should server listen on two ports; i.e., one for streaming client requests and one for xmlrpclib calls, or is there a way to do it by somehow delegating the request to the appropriate handler based on its type?

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• Using jQuery for Effects

  - by OneNerd

  Ok - have been tasked with possibly an impossible (or at least a potentially nightmarish) scenario. Need to come as close as possible to reproducing PowerPoint-like effects via HTML/JavaScript (the spec is large and ugly, so I will spare you the details). Ultimately, I am looking for a solid launching point. I have used both Prototype/Scriptaculous as well as jQuery in many projects, and based on what I am seeing, it appears jQuery has the more plug-in available, so am leaning towards using jQuery. Can anyone point me to some plug-ins, articles, or anything else that would help me in accelerating the research on this so I can define to my client what can and cannot be done. Any other suggestions from you jQuery gurus are welcome of course. Thanks -

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• What is a good reporting service for a simple database/hobbyist setup?

  - by Zombies

  I have a meager production environment running on my PC for a little application that I work on in my spare time. At this point I have the basics setup, MySQL, junit, svn... I am midway through development and I now need to generate various reports. These reports are based on what data is in the database.... Now, my question is this: Is there an existing reporting tool that accepts SQL and generates various reports (via: email, PDF, etc). Some tool which makes writing new reports easy, while also having a somewhat robust set of features. Does this software exist or must I write all of these reports myself?

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• Solution for distributing MANY simple network tasks?

  - by EmpireJones

  I would like to create some sort of a distributed setup for running a ton of small/simple REST web queries in a production environment. For each 5-10 related queries which are executed from a node, I will generate a very small amount of derived data, which will need to be stored in a standard relational database (such as PostgreSQL). What platforms are built for this type of problem set? The nature, data sizes, and quantities seem to contradict the mindset of Hadoop. There are also more grid based architectures such as Condor and Sun Grid Engine, which I have seen mentioned. I'm not sure if these platforms have any recovery from errors though (checking if a job succeeds). What I would really like is a FIFO type queue that I could add jobs to, with the end result of my database getting updated. Any suggestions on the best tool for the job?

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• java cannot reserver heap size error on windows server

  - by Prad

  HI, I have the following configuration: Server : windows 2003 server (32 bit) java version: 1.5_0_22 I get the following error when executing from command line ( my code is based off eclipse wihch gives the same error) java -XX:MaxPermSize=256m -Xmx512m Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. The server has over 20GB physical memory with over 19 GB free right now. It does not give an error upto -Xmx486m I have read other articles about contiguous memory space. There is hardly anything running on this server. Can I validae this in any way? Thanks

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• Anonymous users support vs Google bot

  - by Andy

  I have a User class in my web app that represents a user currently logged in. Every time a user vists a page, a User instance is populated based on authentication data supplied in cookies. A User instance is created even if an anonymous user logs in - and a corresponding new record is created in the User table in the database. This approach allows me to save some state info for the current user regardless of its type. The problem however with this approach is the Google bot, and other non-human web organisms crawling my pages. Every time a bot starts to walk around the site, thousands of useless records will be created in the database, each of them only to be used for a single page. Question: what is the best trade off? How to support anonymous users, save their state, and don't get too much overhead because of cookieless bots?

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• RAM Questions in Iphone

  - by senthilmuthu

  Hi, Every RAM must have stack and heap (like CS,ES,DS,SS 4 segments).but is there like stack size in iphone,is only heap available?some tutorial say when we increase stack size , heap will be decreased,when we increase heap size ,stack will be decreased ...is it true..? or fixed stack size or fixed heap size ? any help please? Based on processor,will be segments changed?is there no need to have 4 segements for all processors?IF RAM does not have stack ,heap, where is it? IF RAM does not have stack ,heap ,where the heap and stack is managed?

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• Any reason why I shouldn't use couchdb for message passing or realtime activity streams?

  - by Up

  While using ampq or xmpp (rabbitmq or ejabbered that could have couchdb as backends) seems like a good fit to deliver real time updates about friend state in a social gaming platform where updates are small but frequent, I can't help but think why wouldn't couchdb be a good platform to deliver such updates? The main advantage I could think of is its ability to filter updates based on friends and availability of changes api, which makes developing such an application and managing it (including replication) quite easy compared to ampq or xmpp where you have to think about how to manage the pubsub nodes and who is subscribed to them at any point in time. However, I can't help but think this is too good to be true, I can't find information on what couchdb's shortcomings are. Somehow, it feels like using MySQL for message passing which is why I am hesitant to using it. Anyone have any experience in using couchdb for such applications? would you recommend another platform to use?

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• Changing GWT theme Dynamically

  - by Nagesh Salunke

  I have a GWT application, I created appBlueTheme.jar,appOrangeTheme.jar and added to BuildPath of project. My module.gwt.xml file has .... <inherits name='appBlueTheme.appBlueTheme'/> <inherits name='appOrangeTheme.appOrangeTheme'/> ... But in my app i see the effect of appBlueTheme as GWT doc say "inherited modules will be cascaded in the order they are listed" I want theme to be changed based on user response. How do i achieve this.? Thanks in advance..

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• Code Golf: Duplicate Character Removal in String

  - by Alex

  The challenge: The shortest code, by character count, that detects and removes duplicate characters in a String. Removal includes ALL instances of the duplicated character (so if you find 3 n's, all three have to go), and original character order needs to be preserved. Example Input 1: nbHHkRvrXbvkn Example Output 1: RrX Example Input 2: nbHHkRbvnrXbvkn Example Output 2: RrX (the second example removes letters that occur three times; some solutions have failed to account for this) (This is based on my other question where I needed the fastest way to do this in C#, but I think it makes good Code Golf across languages.)

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• Rails is not passing the "commit" button parameter

  - by Wayne M

  Reinstalling a Rails app on a new server. Part of the app can fork in one of two directions based on the button the user selects. This part isn't working, and when I look at the log I see the values that I gave the form, execept for the commit portion of the params hash. This seems to be why the app isn't working as expected (since there's nothing in params[:commit], but I have no idea why commit would not be passed in; the request is definitely a POST request, and all of the other parameters are there.

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• Searching for a complex and well-designed PHP OOP application to learn from

  - by Raveren

  Basically, I am diving ever deeper into complex programming practices. I've almost no friends that are experienced (or more experienced than me) programmers to learn from, so I am looking for the next best thing - learning from the work of strangers. Can anyone recommend a real world finished and working application written well and OOP-centered. I'd like to take and analyze its source. Bonus if it's based on Zend Framework. What I am interested most in is objects that unlike desktop applications, have only one real operation done to them (or to their representation in DB or session) during their lifetime (or pageload), like user-logIn(). I'm interested in optimal and reusable design patterns and their real life implementations.

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• Reporting Services Linear Gauge Scale

  - by lnediger

  I have set up a linear gauge in Reporting Services 2008. What I would like to do is specify my scale interval. The only problem with this is the scale intervals I would like to use are not at constant intervals. For example, say the scale min is $0 and the scale max is $10 000. Depending on the chart I may want an interval marker labelled at $2000, $5000, then $7945. These numbers would be calculated based on percentages of scale max specified in the dataset. I have not been able to figure out how I would go about doing this.

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• I'm trying to implement 2 factor authentication on the cheap. How would I do that?

  - by Biff MaGriff

  Ok so I need 2 of the 3. Something the user knows. Something the user has. Something the user is. I have a system that is exposed to the internet and we need clients to connect in a secure manner to satisfy our security standards. I'm thinking when a user registers to use our system we send them an application that they install on their home system. The application generates a key based on a timed randomness algorithm. Our application server has the same algorithm so when the user submits their credentials with the key we know that they are a legitimate user. Is this a valid method of 2 factor authentication? What is another way of doing this? Are there any pitfalls that I should be aware of? Thanks for your help!

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• C++ refactor common code with one different statement

  - by user231536

  I have two methods f(vector<int>& x, ....) and g(DBConn& x, ....) where the (....) parameters are all identical. The code inside the two methods are completely identical except for one statement where we do different actions based on the type of x: in f(): we do x.push_back(i) in g(): we do x.DeleteRow(i) What is the simplest way to extract the common code into one method and yet have the two different statements? I am thinking of having a templated functor that overloads operator () (int a) but that seems overkill.

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• Haskell: reading multiple command line arguments

  - by Survot

  Hi all, Okay, so I am making a program in Haskell that needs to change certain words based on two command line arguments. I have made the replace function and everything works great, but I am stumped getting it to work with command line arguments. Here is the main code: (replace function not included) main = do text <- getContents (command1:command2:_) <- getArgs putStrLn (replace (read command1) (read command2) text) So for intstance in the terminal I want to be able to type something like: "--- cat textfile.txt | ./replace oldword newword" I know this code is close since I have seen others do it this way. O_o Thanks for any help

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