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• Overhead of serving pages - JSPs vs. PHP vs. ASPXs vs. C

  - by John Shedletsky

  I am interested in writing my own internet ad server. I want to serve billions of impressions with as little hardware possible. Which server-side technologies are best suited for this task? I am asking about the relative overhead of serving my ad pages as either pages rendered by PHP, or Java, or .net, or coding Http responses directly in C and writing some multi-socket IO monster to serve requests (I assume this one wins, but if my assumption is wrong, that would actually be most interesting). Obviously all the most efficient optimizations are done at the algorithm level, but I figure there has got to be some speed differences at the end of the day that makes one method of serving ads better than another. How much overhead does something like apache or IIS introduce? There's got to be a ton of extra junk in there I don't need. At some point I guess this is more a question of which platform/language combo is best suited - please excuse the in-adroitly posed question, hopefully you understand what I am trying to get at.

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• How many double numbers are there between 0.0 and 1.0?

  - by polygenelubricants

  This is something that's been on my mind for years, but I never took the time to ask before. Many (pseudo) random number generators generate a random number between 0.0 and 1.0. Mathematically there are infinite numbers in this range, but double is a floating point number, and therefore has a finite precision. So the questions are: Just how many double numbers are there between 0.0 and 1.0? Are there just as many numbers between 1 and 2? Between 100 and 101? Between 10^100 and 10^100+1? Note: if it makes a difference, I'm interested in Java's definition of double in particular.

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• In scala can I pass repeated parameters to other methods?

  - by Fred Haslam

  Here is something I can do in java, take the results of a repeated parameter and pass it to another method: public void foo(String ... args){bar(args);} public void bar(String ... args){System.out.println("count="+args.length);} In scala it would look like this: def foo(args:String*) = bar(args) def bar(args:String*) = println("count="+args.length) But this won't compile, the bar signature expects a series of individual strings, and the args passed in is some non-string structure. For now I'm just passing around arrays. It would be very nice to use starred parameters. Is there some way to do it?

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• Android, how to make two buttons next to each other with the same width

  - by user3674127

  Im trying to place two buttons on the xml next to each other and I want them both to be the same size(half from the width of the screen) - this is my xml: <LinearLayout android:layout_width="fill_parent" android:orientation="horizontal" android:id="@+id/linearLayout2" android:layout_height="fill_parent" android:gravity="bottom" android:weightSum="2"> <Button android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/bAddDelete" /> <Button android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/bMainMenu" /> </LinearLayout> Everything works well, but when im changing the text in java, the width is changing, how can I make them the same size? Thanks

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• how can I open eclipse and see the project view I last looked at?

  - by Stato Machino

  I'm completely mystified. I do not understand why Eclipse does not show me my list of projects! And all the answers I've seen to similar questions do not mention any 'go here and do that' type of answers. I tried 'Import/General/Existing Projects into Workspace/browse-to...' but that told me the project was already in the workspace. But I KNEW THAT! The project menu does not have an 'open project' option!!!! There is no 'open workspace' option. How do people open Eclipse and 'resume working'??? What is the single, dependable, repeatable option for opening the 'project tree' to show my project? [or tell me my expectations that Java people are smarter are way off base!] Thanks, Kimball

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• What language should I learn to make 2D turn-based video games?

  - by giggles

  I want to make 2 dimensional turn-based games for the PC. Something like early Final Fantasy or Chrono Trigger. Is C++ the only plausible option? I keep getting told that C++ is the language of choice for games, but is this the case even for 2D, turn-based games? Are any other languages good for this sort of thing? I'm really big on clean, readable, extendible code, so a language that fosters that sort of thing would be great. Doing this for fun, not business. Java is the only language I really know well right now. By the way, this is my first question and I'm a noob. I read the FAQ, but if I'm doing anything noobish anyway, then I'm sorry.

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• Is there another way to integrate PDF viewing in a Flex application?

  - by BCunningham

  I'm looking at ways to embed PDF viewing in a Flex application. Currently the only option I've seen is by using the flash.html.HTMLLoader class, which only works if you're using AIR. This isn't a big deal -- I'm willing to use AIR if I have to -- but based on my experimentation with viewing a PDF this way it appears that AIR simply integrates the embedded Adobe PDF browser Plug-in for viewing, which not only shows the PDF page(s), but provides all of the manipulation controls as well (zooming, printing, etc.) which I don't want to see. I'm looking for something that works somewhat along the lines of the JPedal library for Java -- an embedded component that simply renders the PDF alone. Has anyone found a way to do this with either AIR's built-in component or via some other method?

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• Most reliable method for uploading files in PHP w/ progress bar

  - by vanneto

  Hello everyone, I am interested in finding the most reliable method for uploading files in PHP. I need a progress bar with the upload. I have tried SWFUpload but it randomly issues an I/O Error. Even if the same file is uploaded sometimes there is an error and sometimes there is not. I have configured all the necessary INI/Mysql/Apache directives to accept large file uploads. So, I am looking for alternatives as a Flash based solution has not worked. Would Java be more relirable? I have also looked into PHP with APC. I definitely cannot afford these random errors, so any help on reliable software / suggestions on how to minimize them would be appreciated. Thank you.

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• codingstyle "blanking after open and before close brackets"

  - by Oops

  Hi, I really like the "blanking after open and before close brackets"-codingstyle in modern codes Java/C#/C++ . e.g. calling a function: foo(myparam); // versus foo( myparam ); Do you have a better name for this codingstyle? where does it come from? Do you like it either, what is the reason for you to use it or not use it? a few years ago people said "you are blanking" if one has used too much blank space characters in a forumspost or email. many thanks in advance regards Oops

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• Help me validate these points regarding Ruby

  - by Bragaadeesh

  Hi, I have started learning Ruby for the past 2,3 weeks and I have come up with some findings on the language. Can someone please validate these points. Implemented in many other high level languages such as C, Java, .Net etc., Is slow for the obvious reason that it cannot beat any of the already known high level languages. Should never be compared with any other high level language. Not suitable for large applications. Completely open source and is in a budding state. Has a framework called Rails which claims that it would be good for Agile development Community out there is getting better day by day and finding help immediately should not be a problem as time goes by. Has significant changes between releases which many developers wont welcome right away. Running time cannot be comprehensively estimated since the language has several underlying implementation in several languages. Books are always outdated by the time when you finish them. Thanks.

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• Rails rabl json format

  - by brabertaser1992

  I'm displaying data from my db in json format using rabl to parse it for android... My json looks like so: [ { "bank":{ "central_office_address":"ololo", "license":"12312312", "location_id":3, "name":"Pbank", "tax_number":"12312312", "year_of_foundation":1987 } }, { "bank":{ "central_office_address":"sdfsdf sdf", "license":"321312", "location_id":3, "name":"Bbank", "tax_number":"321321", "year_of_foundation":1999 } } ] I need my json in a format like: { "contacts": [ { "id": "c200", "name": "Ravi Tamada", "email": "[email protected]", "address": "xx-xx-xxxx,x - street, x - country", "gender" : "male", "phone": { "mobile": "+91 0000000000", "home": "00 000000", "office": "00 000000" } }, { "id": "c201", "name": "Johnny Depp", "email": "[email protected]", "address": "xx-xx-xxxx,x - street, x - country", "gender" : "male", "phone": { "mobile": "+91 0000000000", "home": "00 000000", "office": "00 000000" } } ] } Such data is normally parsed in java.... My rabl view: object @banks attributes :central_office_address, :license, :location_id, :name, :tax_number, :year_of_foundation How do I change its output to match the second example?

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• A strange issue... No code changes getting reflected.

  - by sachin

  I am using netbeans to develop an applet, i have a piece of code which looked like this: ipAddresss = DEFAULT_IP; System.out.println("portlet.services.hostname:" + ipAddresss); Now I changed it to something like this: ipAddresss = DEFAULT_IP; System.out.println("portlet.services.hostname using default IP Address:" + ipAddresss); But no matter what I do, it sill keep on printing: portlet.services.hostname:null I have tried deleting all .netbeans folder from documents and settings, tried creating new project, but now i am completely baffled by this issue... So, the problem is, no matter what I do, no change is getting reflected when I run the program. Can there be a java applet cache, netbeans cache, i am not sure why...

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• How to access device settings on a S60 symbian based mobile phone?

  - by TheRHCP

  Hello everyone, I recently bought a Sony Ericsson mobile phone which embeds Symbian S60 and I would like to add a missing feature myself. In fact I cannot actually disable Internet connection in an easy way when roaming, which cost me a lot of money last time I moved away ... So I would like to develop a little application that would just replace the actual Internet configuration with a fake configuration to avoid auto-connections. So what I would like to know is how can I access programmatically to my phone settings? I believe that this is possible but I do not really have a clue where to start. I know that Sony Ericsson provides a SDK to run Java applications on its customised JVM but Symbian is also providing a SDK to develop applications for S60 devices in many languages. The real questions is which SDK will provide an API able to access phone settings. This is not well documented so I am asking this question with the hope that someone here already had experience with development for Sony Ericsson/Symbian devices. Thanks.

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• what (clip) and DataLine.Info represents...?

  - by user528050

  I got this code from one of my friend. import java.io.*; import javax.sound.sampled.*; public class xx { public static void main(String args[]) { try { File f=new File("mm.wav"); AudioInputStream a=AudioSystem.getAudioInputStream(f); AudioFormat au=a.getFormat(); DataLine.Info di=new DataLine.Info(Clip.class,au); Clip c=(Clip)AudioSystem.getLine(di); c.open(a); c.start(); } catch(Exception e) { System.out.println("Exception caught "); } } } But i didn't understand what this line means Cilp c=(Clip)AudioSystem.getLine(di); what (clip) represents....? And my 2nd problem is what is the DataLine is it an interface and what is the meaning of this statement DataLine.Info....?

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• Why does the app signature change in Android after a classpath change?

  - by espinchi

  I have an Android project that branched into three different applications, app-1, app-2 and app-3, that apply some customizations. Currently there is a lot of code duplication, making maintenance a nightmare: do the changes in one of the branches, and then merge the other two. So we create a library project, named app-core, that factors out most of the duplicated code. So far so good. When I launch this into an emulator where the application was already loaded (before the refactoring), I get this exception: Re-installation failed due to different application signatures A different signature? But I just added a line in the .classpath to link to the app-core Java project! The main question is: are the existing users going to be bothered by this too? And the side question: Why is it a different signature?

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• MySQL & NHibernate. How fix the error: Column 'ReservedWord' does not belong to table ReservedWords?

  - by Eduardo Xavier

  "I am getting a weird error when using NHibernate. And I don't know what is causing this error. I am new to the whole Visual Studio and NHibernate, but not to Hibernate. I used Hibernate in the past in Java projects. Any help would be appreciated in pointing me where my error is. I am using Visual Studio 2008 SP1 with Mysql 5.1. Below is the code I am using. " The full code and examples are posted here: https://forum.hibernate.org/viewtopic.php?f=25&t=997701

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• validate XML with XSD in c++

  - by katl

  Hi! Im pretty new to both XML validation and C++ (more familiar with Java..) so I guess this is a trivial question. If I have a XML file and a XSD schema, how is the best way to validate them? Id like to to this in c++ without using external libraries, or as little libraries as possible, is it possible? Other ideas of how this can be done? I want a simple solution, the output needed is just if the validation i successful or not. Any help is appreciated // Katarina

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• Jython: Is there any difference between adding to sys.path vs passing -D?

  - by trinth

  I have a python application that is trying to load some Java libraries (specifically Axis2 web services). When I add the necessary jars in Eclipse via PyDev Project Source Folders, everything seems to work fine. However, I want to be able to do this at run time by adding to sys.path, but then my application doesn't seem to work. In both cases I can load the jars just fine, but something must be different for there to be different results. My question is, is there a difference between adding jars via the sys.path at run time with sys.path.append() versus passing -D to the jython interpreter?

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• Consume RESt API from .NET

  - by Ajish

  Hi All, I am trying to consume REST API from my .NET Application. This API's are all written in JAVA. I am asked to pass the authentication credentials vis HTTP headers. How can I pass these authentication credentials like 'DATE', 'AUTHORIZATION' and 'Accept' via HTTP headers. Which class in .NET can I use to accomplish this task. Can anyone help me with this? All your help will be appreciated. Ajish.

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• How do I get the inner arrays length in a 2d array in C#?

  - by Phukab

  Lets say I create a jagged 2d array like so: public static char[,] phoneLetterMapping = { {'0'}, {'1'}, {'A', 'B', 'C'} }; Now, given the first index of the array, I would like to be able to get the length of the inner array. So, I would like to be able to do something like: phoneLetterMapping[2].length I can do that in Java. But the intellisense menu doesn't return the normal members of an array when I type in the first bracket of the [][] 2d array. So, how do I get the inner array lengths in my 2d array in C#?

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• what are the various approaches for generating PDFs?

  - by andthereitgoes

  I have an idea for an app that would take some flash content which contains graphics and images like various geometric shapes and polygons and some random images and convert them to PDF. Also, since I envision this app to be used my multiple users I want this process to be quick and scalable. One possible solution I could think of is have a small flash client with the capability of assembling the above mentioned graphics and images. Generate some sort of XML, send it to a server running a Java process which could render the PDF using iText. I was wondering what are the other possible ways to do it or the best practices. Technology isn't an issue; open source or commercial. I am looking for ideas to make the process fast and scalable. Most importantly, I don't want the back end server side PDF render engine to constraint the flash client capabilities. I would appreciate if you could share your tech stack idea. Thanks a lot!

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• Best memory settings for eclipse 4.2 (STS 3.1) on Windows 7 64 bit?

  - by jorrebor

  I apoligize in advance if this question is indeed too subjective as SO warns me. My workstation has 8 gb of ram and runs windows 7 64 bit. I use the Spring tool Suite (3.1) but as soon as i am starting to open and modify the spring config (.xml) files, STS becomes incredibly slow. I already tried switching off "build automatically" and to increase memory settings but no luck. How should i change my .ini ? this is what i have set now: -vm C:/Program Files/Java/jdk1.7.0_07/bin/javaw.exe -startup plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20120522-1813 -product org.springsource.sts.ide --launcher.defaultAction openFile --launcher.XXMaxPermSize 4096M -vmargs -Dosgi.requiredJavaVersion=1.5 -Xms512m -Xmx2048m -XX:MaxPermSize=512m My collageu running the same project in IntelliJ, has no problems. Thank you!

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• Technologies used in EMBL

  - by Sergej Andrejev

  My fried suggest I try to apply for a job at EMBL. I'm not bioinformatic in any way, but my friend (who by the way is a biologist working at EMBL) insists that I could adapt to the new environment as long as I have a interest in subject and am generally good at learning new things. But here is a catch. For the last 4 years I've been working with .Net and other Microsoft technologies which I enjoy even more lately. Now, from googling I couldn't find whether it will be possible for me to stick with .Net because it was all perl, java, linux and so on. Is there anybody who could prove whether there is at least minor opportunity for a .Net developer to at least partly develop with C#?

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• what is the relation between actual pixels and html(css) pixels in blackberry?

  - by HelpMeToHelpYou

  I am implementing one phonegap application. here everything going fine but when i am talking device specifications like 1)BlackBerry Bold Touch 9900 Screen specifications are as following Body Dimensions 115 x 66 x 10.5 mm (4.53 x 2.60 x 0.41 in) Weight 130 g (4.59 oz) Keyboard QWERTY Display Type TFT capacitive touchscreen, 16M colors Size 640 x 480 pixels, 2.8 inches (~286 ppi pixel density) But when i test following function in java script function findScreenSize() { alert("width:"+window.innerWidth +"Height:"+ window.innerHeight); } it displaying SIZE width : 356 Height : 267 (356 x 267) 2)BlackBerry Bold Touch 9930 Screen specifications are as following Body Dimensions 115 x 66 x 10.5 mm (4.53 x 2.60 x 0.41 in) Weight 130 g (4.59 oz) Keyboard QWERTY - Touch-sensitive controls Display Type TFT capacitive touchscreen, 16M colors Size 640 x 480 pixels, 2.8 inches (~286 ppi pixel density) then i run same javaScript function i got following output it displaying SIZE width : 417 Height : 313 (417 x 313) why it is behaving like this ? Can anybody know relation between core pixel and HTML pixel please give answer

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• Bringing Scala into my company

  - by raichoo

  Hi, Now i know that this one is actually not a very technical question but one that has been bothering me for some time. Actually we are using a lot of C++ and PHP at our company and some of our developers are really hoping for a new and modern language to come by to help us getting more productive. I have been talking about what scala can do and the other coders seem to gain some interest in the language. The tough job is, how do you convince your boss to consider scala as a language for the company. I saw the presentation "Sneaking Scala into your company", but it deals with the situation that you are using Java at your company which we don't. How do you fight of the usual "that is just esoteric stuff" and "we can already do that in $LANGUAGE" arguments. I was planing to give a talk about Scala, and since I don't have much time I need Killer Arguments. How did you guys do it? Regards, raichoo

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