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• Why is memory management so visible in Java VM?

  - by Emil

  I'm playing around with writing some simple Spring-based web apps and deploying them to Tomcat. Almost immediately, I run into the need to customize the Tomcat's JVM settings with -XX:MaxPermSize (and -Xmx and -Xms); without this, the server easily runs out of PermGen space. Why is this such an issue for Java VMs compared to other garbage collected languages? Comparing counts of "tune X memory usage" for X in Java, Ruby, Perl and Python, shows that Java has easily an order of magnitude more hits in Google than the other languages combined. I'd also be interested in references to technical papers/blog-posts/etc explaining design choices behind JVM GC implementations, across different JVMs or compared to other interpreted language VMs (e.g. comparing Sun or IBM JVM to Parrot). Are there technical reasons why JVM users still have to deal with non-auto-tuning heap/permgen sizes?

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• Verifying university membership/attendance via email address

  - by mettadore

  My client's web app allows members to sign up (Rails using AuthLogic) and those signups are limited in that they must be under the auspices of a university. To wit: A university organizer can sign up to be the representative of a university, and students can sign up as "attendees" of that university. I've been tasked with finding if there is a programmatic way to verify university membership/attendance. The only way I can see doing this is having a database of universities and a database of associated emails, and verifying that the student's email address is part of this database. That doesn't help if using Facebooker and AuthLogic's "sign up with Facebook credentials" ability, however. I suspect the answer to this is "via human intervention," and that this is something we can't solve programmatically. Either we, or the university, will have to bite the bullet and check records. However, I'd thought I'd ask if anyone else has run into the issue of verification of university membership before.

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• emacs indentation in asm mode

  - by Gauthier

  I am looking for the equivalent of c-indent-level and ruby-indent-level, for asm-mode. That is, I want to force the indentation to 4 spaces, and I want them to be replaced with blanks. What I've seen tells me it does not exist for asm-mode. Could someone please tell me this is wrong? I tried this also: http://stackoverflow.com/questions/69934/set-4-space-indent-in-emacs-in-text-mode , to no av. I have tried: (setq tab-width 4) (setq indent-line-function 'insert-tab) (setq asm-indent-level 4) This works however: (custom-set-variables '(tab-stop-list (quote (4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120)))) But I wonder if there is a way to define that for asm-mode only. What if I wanted to keep the default tab behaviour for other modes?

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• immutable strings vs std::string

  - by Caspin

  I've recent been reading about immutable strings, here and here as well some stuff about why D chose immutable strings. There seem to be many advantages. trivially thread safe more secure more memory efficient in most use cases. cheap substrings (tokenizing and slicing) Not to mention most new languages have immutable strings, D2.0, Java, C#, Python, Ruby, etc. Would C++ benefit from immutable strings? Is it possible to implement an immutable string class in c++ (or c++0x) that would have all of these advantages?

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• Requirements of an issue/bug tracker

  - by James Brooks

  I've been looking at various issue/bug trackers available on the net. There are some very good ones, but I'm unable to use them as my server does not support Perl/Ruby (for example), I'm not too bothered however because I am able to write code in PHP and as such would prefer something in that language. So I've taken it upon myself to write a custom issue tracker system. As of now it's in early planning stages, and before I continue, I'd like to find out what people need from such an application. My current list of things to add include: Creating/Editing/Deleting issues - both on user and admin level Related issues (similar to that of STO) Admins will be able to create builds/milestones and version control of projects Admins will be able to assign users/groups to a project Roadmap of projects Possible SVN integration with Git? What do you think? There are a couple more things I'd like to add, but I'm sure you'll think of a better way of adding such feature. What would you like to see from an issue tracker?

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• Desktop mono app and MVC/MVP framework

  - by tempy

  I am looking for a MVC/MVP (mvp prefferably) framework for my first mono app. There doesn't seem to be too much out there, but I have found the following: http://www.mvcsharp.org/ http://desktoprails.osl.ull.es/doku.php I've been looking into both for some time, and MVC# seems to be closer to what I want. The issue is that MVC# seems to be a .net project and not designed specifically for mono (as opposed to desktop rails), so I'm not 100% sure how it will play with mono. Also, it is under the Microsoft Public License (MsPL), and I am not sure how well that license will play with other components I intend to use that are gpl/mit/apache/etc. So if anyone has any experience with either of these frameworks in mono and can answer any of these questions, I would appreciate any feedback.

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• I would like to build a Java Web Application. What's the quickest start?

  - by Vish

  I am a reasonably competent programmer, with about 11 years experience. I particularly like Ruby/Rails and ActionScript. And Java is not too hard. I'd like to develop a web application in Java in order to leverage things like BlazeDS and learn some new tricks with regard to JBoss and the whole Java App thing. But I'm having trouble - and confused - looking for a smooth start. I don't want to use Grails, thanks, I want to use Pure Java, with whatever Framework you can think of. Spring, Hibernate, lalala, it's cool. Where do I start?

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• Should I unit test my JavaScript?

  - by Joseph Silvashy

  I'm curious to if it would be valuable, I'd like to start using QUnit, but I really don't know where to get started. Actually I'm not going to lie, I'm new to testing in general, not just with JS. I'm hoping to get some tips to how I would start using unit testing with an app that already has a large amount of JavaScript (ok so about 500 lines, not huge, be enough to make me wonder if I have regression that goes unnoticed). How would you recommend getting started and Where would I write my tests? (for example its rails app, where is a logical place to have my JS tests, it would be cool if they could go in the /test directory but it's outside the public directory and thus not possible... err is it?)

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• Why are action based web frameworks predominant?

  - by deamon

  Most web frameworks are still using the traditional action based MVC model. A controller recieves the request, calls the model and delegates rendering to a template. That is what Rails, Grails, Struts, Spring MVC ... are doing. The other category, the component based frameworks like Wicket, Tapestry, JSF, or ASP.Net Web Forms have become more popular over the last years, but my perception is that the traditional action based approach is far more popular. And even ASP .Net Web Forms has become a sibling name ASP .Net Web MVC. I think the kind of applications built with both types of frameworks is overlapping very much, so the question is: Why are action based frameworks so predominant?

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• From interpeted to native code: "dynamic" languages compiler support

  - by Daniel

  First, I am aware that dynamic languages is a term used mainly by a vendor; I am using it just to have a container word to include languages like Perl (a favorite of mine), Python, Tcl, Ruby, PHP and so on. They are interpreted but I am interested here to refer to languages featuring strong capability to support the programmer efficiency and the support for typical constructs of modern interpreted languages My question is: there are dynamic languages can be compiled efficiently in native executable code - typically for Windows platforms? Which ones? Maybe using some third part ad-hoc tools? I am not talking about huge executables carrying with them a full interpreter or some similar tricks nor some smart module able to include its own dependances or some required modules, but a honest, straight, standard, solid executable code. If not, there is some technical reason inhibiting the availability of such a best-of-both-world feature? Thanks! Daniel

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• How do I verify the URL that ActiveResource intends to use on a call?

  - by btelles

  Hi there, I'm trying to request data from another Rails app, but I keep getting a "URL not found" error. Is it possible to use the debugger to figure out the intended URL and parameters for an intended ActiveResource call? For example, I'd like to make a GET request with the following parameters: https://some_server.com/employees/search.xml?last_name=smith And I have the following ActiveResource model class Employee < ActiveResource::Base self.site = "https://.some_server.com" end And the some_server.com app has a search action that maps this way: map.connect "/employees/search.:format", :controller => 'employees', :action => 'search' But when I try this: Employee.new(:last_name => 'smith).get(:search) I get a 404 "Service not found" error. To me, that sounds like the URL that ACtiveResource is requesting is incorrect, 'cause when I make the above request via a browser, I get the xml. Any idea what I'm doing wrong? Cheerio, Berns

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• Can I suppress newlines with Django's template engine?

  - by ento

  In Rails ERB, you can suppress newlines by adding a trailing hyphen to tags: <ul> <% for @item in @items -%> <li><%= @item %></li> <% end -%> </ul> becomes: <ul> <li>apple</li> <li>banana</li> <li>cacao</li> </ul> Is there a way to do this in Django? (Disclosure: I'm generating a csv file with Django)

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• Gtk+ vs Qt language bindings

  - by Adam Smith

  Put shortly: For those familiar with language bindings in Qt and Gtk+. E.g. python and ruby. Are there any quality or capability difference? More background: I know C++ and Qt very well. Minimal experience with Gtk+. I know C++ is not ideal for language bindings due to the lack of a well defined ABI (application binary interface). I also read that Gtk+ was designed to be bound to other languages. So I wonder how this manifets itself in practice. Are the Gtk+ bindings better maintained or work better in some way than their Qt counterparts? I am presently quite interested in the Go language, and they have started developing Gtk+ bindings. However C++ bindings is far away. It makes me wonder whether learning Gtk+ is worth it.

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• Java: conditional initialization?

  - by HH

  Ruby has conditional initialization. Apparently, Java does not or does it? I try to write more succintly, to limit the range as small as possible. import java.io.*; import java.util.*; public class InitFor{ public static void main(String[] args){ for(int i=7,k=999;i+((String h="hello").size())<10;i++){} System.out.println("It should be: hello = "+h); } } Errors Press ENTER or type command to continue InitFor.java:8: ')' expected for(int i=7,k=999;i+((String h="hello").size())<10;i++){} ^

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• Can I suppress newlines after each template tag with Django's template engine?

  - by ento

  In Rails ERB, you can suppress newlines by adding a trailing hyphen to tags: <ul> <% for @item in @items -%> <li><%= @item %></li> <% end -%> </ul> becomes: <ul> <li>apple</li> <li>banana</li> <li>cacao</li> </ul> Is there a way to do this in Django? (Disclosure: I'm generating a csv file with Django) Edit: Clarified that the newlines I'm hunting down are the ones left behind after the template tags.

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• How to debug a corrupt pdf file?

  - by Joelio

  Hi, im generating pdf files using a ruby library called "prawn". I have one particular file that seems to be considered "Corrupt" by adobe reader. It shows up fine in both preview and in adobe reader. It gives errors like: Sometimes I get: "Could not find the XObject named '%s'. Othertimes I get: "Could not find the XObject named "Im4". Then always I get: "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem." Is there a way to open a pdf with some tool and have it tell you what is technically wrong with the pdf? Im sure I could figure it out quickly with something like this... thanks Joel

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• Multi-platform development from one computer

  - by iama

  I am planning to build a new development computer for both Windows & Linux platforms. On Windows, my development would be primarily in .NET/C#/IIS/MSSQL Server. On Linux—preferably Ubuntu—my development would be in Ruby and Python. I am thinking of buying a laptop with Windows 7 pre-installed with 4GB RAM, Intel Core 2 Duo, and 320 GB HD; running 2 VMs for both Windows and Linux development with the host OS as my work station. Of course, I would be running DBs and web servers on the respective platforms. Is this a typical setup? My only concern is running two VMs side by side. Not sure if this configuration would be optimal. Alternative would be to do my Windows development on the host Windows 7 OS. What are your thoughts?

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• Git push origin master

  - by user306472

  I am new to git and recently set up a new account with github. I'm following a rails tutorial from Michael Hartl online ( http://www.railstutorial.org/book#fig:github_first_page ) and followed his instructions to set up my git which were also inline with the setup instructions at github. Anyways, the "Next Steps" section on github were: mkdir sample_app cd sample_app git init touch README git add README git commit -m 'first commit' git remote add origin [email protected]:rosdabos55/sample_app.git git push origin master I got all the way to the last instruction (git push origin master) without any problem. When I entered that last line into my terminal, however, I got this error message: "fatal: No path specified. See 'man git-pull' for valid url syntax." What might I be doing wrong?

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• How many layers are between my program and the hardware?

  - by sub

  I somehow have the feeling that modern systems, including runtime libraries, this exception handler and that built-in debugger build up more and more layers between my (C++) programs and the CPU/rest of the hardware. I'm thinking of something like this: 1 + 2 OS top layer Runtime library/helper/error handler a hell lot of DLL modules OS kernel layer Do you really want to run 1 + 2?-Windows popup (don't take this serious) OS kernel layer Hardware abstraction Hardware Go through at least 100 miles of circuits Eventually arrive at the CPU ADD 1, 2 Go all the way back to my program Nearly all technical things are simply wrong and in some random order, but you get my point right? How much longer/shorter is this chain when I run a C++ program that calculates 1 + 2 at runtime on Windows? How about when I do this in an interpreter? (Python|Ruby|PHP) Is this chain really as dramatic in reality? Does Windows really try "not to stand in the way"? e.g.: Direct connection my binary < hardware?

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• The next step & technology towards web services.

  - by webzide

  Hi, My name is Dennis and I am pretty ambitious of creating the next big thing for the web. I have ideas but now I gotta get to work to learn the tools. I am learning Javascript. I don't know if next step for me to take is PHP or some suggests RUBY on Rails. What are the pros and cons. With your experience, I wish you could hint me to the right direction. Thanks. I don't mind working hard. My goal is to create a comprehensive and secure web service platform as well as a fast and user friendly UI.

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• Shall i learn Assembly Language or C, to Understand how "real programming" works?

  - by Daniel Upton

  Hello, World.. I'm a web developer mostly working in Ruby and C#.. I wanna learn a low level language so i dont look like an ass infront of my (computer science expert) boss. Ive heard a lot of purist buzz about how assembly language is the only way to learn how computers actually work, but on the other hand C would probably be more useful as a language rather than just for theory. So my question is.. Would Learning C teach me enough computer science theory / low level programming to not look like a common dandy (complete tool)? Thanks! Daniel

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• What useful macros have you created in Netbeans?

  - by Richard Poirier

  I use Netbeans (nightly build) for Ruby on Rails development and I'm looking to beef up my macros. I've created a few myself: copy identifier: select-identifier copy-to-clipboard paste clipboard over identifier: select-identifier paste-from-clipboard double quote element select-element-next "\"" single quote element: select-element-next "'" But I'm looking for other useful ones and Google is giving me nothing. The record macro feature usually doesn't work too well so I'd rather just "write" the macros myself but I can't even find a reference that lists what commands (like "select-identifier") are actually available. Any Netbeans macro gurus out there?

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• How did Perl gain a reputation for being a write-only language?

  - by Andrew Grimm

  How did Perl gain a reputation (deserved, undeserved, or used to be deserved, no longer so) of being a "write only language"? Was it The syntax of the language Specific features that were available in the language Specific features not being available in the language (or at least old versions of it) The kind of tasks Perl was being used for The kind of people who use Perl (people who aren't full-time programmers) Criticism from people committed to another language Something else? Background: I'd like to know if some aspects that gave Perl the reputation of being write-only also apply to other languages (specifically ruby). Disclaimer: I recognise that Perl doesn't force people to do write-only code (can any language?), and that you can write bad code in any language.

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• C++ HTML template framework, templatizing library, HTML generator library

  - by Marcin Gil

  I am looking for template/generator libraries for C++ that are similar to eg. Ruby's Erb, Haml, PHP's Smarty, etc. It would be great if I it would sport some basic features like loops, if/else, int conversion to strings, etc. Parameter passing to template rendering engine is also important if I could pass all of them in a hash map instead of calling some function for each of parameters. Do you have any recommendations? I can see also the possibility of embedding languages like Lua, however I haven't found a templatizing library for that either. Thanks!

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• How do I do automatic data serialization of data objects in Haskell

  - by Adam Gent

  One of the huge benefits in languages that have some sort of reflection/introspecition is that objects can be automatically constructed from a variety of sources. For example in Java I can use the same objects for persisting to a db (with Hibernate) serializing to XML (with JAXB) or serializing to JSON (json-lib). You can do the same in Ruby and Python also usually following some simple rules for properties or annotations for Java. Thus I don't need lots "Domain Transfer Objects". I can concentrate on the domain I am working in. It seems in very strict FP like Haskell and Ocaml this is not possible. Particularly Haskell. The only thing I have seen is doing some sort of preprocessing or meta-programming (ocaml). Is it just accepted that you have to do all the transformations from the bottom upwards? In other words you have to do lot of boring work to turn a data type in haskell into JSON/XML/DB Row object and back again into a data object.

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