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• Spring 3 Annotations

  - by jboyd

  I can't get spring annotations to work at all, I'm just trying to get the simplest thing to work... .../mycontext/something - invokes method: @RequestMapping(value = "/something") @ResponseBody public String helloWorld() { System.out.println("hello world"); return "Hello World"; } My main problem is no matter how hard I try, I can't find a complete SIMPLE example of the configuration files needed, every spring tutorial is filled with junk, I just one one controller to handle a request with a mapping and can't get it to work does anyone know of a simple and complete spring example. pet-clinic is no good, it's way too complicated, I have a tiny basic use case and it's proving to be a real pain to get working (this always happens with Spring)

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• __getattr__ on a module

  - by Matt Joiner

  How can implement the equivalent of a __getattr__ on a class, on a module? Example When calling a function that does not exist in a module's statically defined attributes, I wish to create an instance of a class in that module, and invoke the method on it with the same name as failed in the attribute lookup on the module. class A(object): def salutation(self, accusative): print "hello", accusative def __getattr__(mod, name): return getattr(A(), name) if __name__ == "__main__": salutation("world") Which gives: matt@stanley:~/Desktop$ python getattrmod.py Traceback (most recent call last): File "getattrmod.py", line 9, in <module> salutation("world") NameError: name 'salutation' is not defined Evidently something is not right about my assumed implementation.

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• Error after installing scala plugin of netbeans

  - by ghedas

  I installed the scala plugin on my netbeans and followed the instruction of this page: http://wiki.netbeans.org/Scala68v1#Scala_Plugins_for_NetBeans_6.8_v1.x_.28RC2.29 but after it completed correctly step by step, when I make an empty project (Hello world!), the project has an error! The empty project is here: package scalaapplication1 object Main { /** * @param args the command line arguments */ def main(args: Array[String]): Unit = { println("Hello, world!") } } and the console error report is: ...\NetBeansProjects\ScalaApplication2\nbproject\build-impl.xml:403: The following error occurred while executing this line: ...\NetBeansProjects\ScalaApplication2\nbproject\build-impl.xml:236: scalac doesn't support the "fork" attribute Is there any suggestion about it?!

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• python duration of a file object in an argument list

  - by msw

  In the pickle module documentation there is a snippet of example code: reader = pickle.load(open('save.p', 'rb')) which upon first read looked like it would allocate a system file descriptor, read its contents and then "leak" the open descriptor for there isn't any handle accessible to call close() upon. This got me wondering if there was any hidden magic that takes care of this case. Diving into the source, I found in Modules/_fileio.c that file descriptors are closed by the fileio_dealloc() destructor which led to the real question. What is the duration of the file object returned by the example code above? After that statement executes does the object indeed become unreferenced and therefore will the fd be subject to a real close(2) call at some future garbage collection sweep? If so, is the example line good practice, or should one not count on the fd being released thus risking kernel per-process descriptor table exhaustion?

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• Java: versioned data structures?

  - by Jason S

  I have a data structure that is pretty simple (basically a structure containing some arrays and single values), but I need to record the history of the data structure so that I can efficiently get the contents of the data structure at any point in time. Is there a relatively straightforward way to do this? The best way I can think of would be to encapsulate the whole data structure with something that handles all the mutating operations by storing data in functional data structures, and then for each mutation operation caching a copy of the data structure in a Map indexed by time-ordering (e.g. a TreeMap with real time as keys, or a HashMap with a counter of mutation operations combined with one or more indexes stored in TreeMaps mapping real time / tick count / etc. to mutation operations) any suggestions?

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• When to use Spring Integration vs. Camel?

  - by ngeek

  As a seasoned Spring user I was assuming that Spring Integration would make the most sense in a recent project requiring some (JMS) messaging capabilities (more details). After some days working with Spring Integration it still feels like a lot of configuration overhead given the amount of channels you have to configure to bring some request-response (listening on different JMS queues) communications in place. Therefore I was looking for some background information how Camel is different from Spring Integration, but it seems like information out there are pretty spare, I found: http://java.dzone.com/articles/spring-integration-and-apache (Very neutral comparison between implementing a real-world integration scenario in Spring Integration vs. Camel, from December 2009) http://hillert.blogspot.com/2009/10/apache-camel-alternatives.html (Comparing Camel with other solutions, October 2009) http://raibledesigns.com/rd/entry/taking_apache_camel_for_a (Matt Raible, October 2008) Question is: what experiences did you make on using the one stack over the other? In which scenarios would you recommend Camel were Spring Integration lacks support? Where do you see pros and cons of each? Any advise from real-world projects are highly appreciated.

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• asp.net mvc diff between DeleteAllOnSubmit and deleteonSubmit

  - by mazhar

  What is the real difference b/w DeleteAllOnSubmit and deleteonSubmit and which one is more appropiate to use?

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• Simple PHP file

  - by Peter

  Here is my code <html> <body> <?php echo "<b>Hello World</b> <br />"; ?> </body> </html> I have named the file as test.php but I dont get the desired output in my firefox 3.6 browser. Output Hello World "; ?>

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• Rationale behind Python's preferred for syntax

  - by susmits

  What is the rationale behind the advocated use of the for i in xrange(...)-style looping constructs in Python? For simple integer looping, the difference in overheads is substantial. I conducted a simple test using two pieces of code: File idiomatic.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 for x in xrange(N): for y in xrange(M): pass File cstyle.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 while x < N: while y < M: y += 1 x += 1 Profiling results were as follows: bash-3.1$ time python cstyle.py real 0m0.109s user 0m0.015s sys 0m0.000s bash-3.1$ time python idiomatic.py real 0m4.492s user 0m0.000s sys 0m0.031s I can understand why the Pythonic version is slower -- I imagine it has a lot to do with calling xrange N times, perhaps this could be eliminated if there was a way to rewind a generator. However, with this deal of difference in execution time, why would one prefer to use the Pythonic version?

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• Casting to generic type in Java doesn't raise ClassCastException?

  - by Kip

  I have come across a strange behavior of Java that seems like a bug. Is it? Casting an Object to a generic type (say, K) does not throw a ClassCastException even if the object is not an instance of K. Here is an example: import java.util.*; public final class Test { private static<K,V> void addToMap(Map<K,V> map, Object ... vals) { for(int i = 0; i < vals.length; i += 2) map.put((K)vals[i], (V)vals[i+1]); //Never throws ClassCastException! } public static void main(String[] args) { Map<String,Integer> m = new HashMap<String,Integer>(); addToMap(m, "hello", "world"); //No exception System.out.println(m.get("hello")); //Prints "world", which is NOT an Integer!! } }

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• Best Practices / Patterns for Enterprise Protection/Remediation of SSNs (Social Security Numbers)

  - by Erik Neu

  I am interested in hearing about enterprise solutions for SSN handling. (I looked pretty hard for any pre-existing post on SO, including reviewing the terriffic SO automated "Related Questions" list, and did not find anything, so hopefully this is not a repeat.) First, I think it is important to enumerate the reasons systems/databases use SSNs: (note—these are reasons for de facto current state—I understand that many of them are not good reasons) Required for Interaction with External Entities. This is the most valid case—where external entities your system interfaces with require an SSN. This would typically be government, tax and financial. SSN is used to ensure system-wide uniqueness. SSN has become the default foreign key used internally within the enterprise, to perform cross-system joins. SSN is used for user authentication (e.g., log-on) The enterprise solution that seems optimum to me is to create a single SSN repository that is accessed by all applications needing to look up SSN info. This repository substitutes a globally unique, random 9-digit number (ASN) for the true SSN. I see many benefits to this approach. First of all, it is obviously highly backwards-compatible—all your systems "just" have to go through a major, synchronized, one-time data-cleansing exercise, where they replace the real SSN with the alternate ASN. Also, it is centralized, so it minimizes the scope for inspection and compliance. (Obviously, as a negative, it also creates a single point of failure.) This approach would solve issues 2 and 3, without ever requiring lookups to get the real SSN. For issue #1, authorized systems could provide an ASN, and be returned the real SSN. This would of course be done over secure connections, and the requesting systems would never persist the full SSN. Also, if the requesting system only needs the last 4 digits of the SSN, then that is all that would ever be passed. Issue #4 could be handled the same way as issue #1, though obviously the best thing would be to move away from having users supply an SSN for log-on. There are a couple of papers on this: UC Berkely: http://bit.ly/bdZPjQ Oracle Vault: bit.ly/cikbi1

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• JQuery live function doesn't work

  - by Sayem Ahmed

  I have some text boxes, all of which have the same class "addExamNumberBoxStyle". Now I want to bind a "blur" handler to each one of these. When I use direct "blur" event like below - $('.addExamNumberBoxStyle').blur(function() { alert("Hello World"); }); it works perfectly. But when I use "live" function like below - $('.addExamNumberBoxStyle').live('blur', function() { alert("Hello World"); }); it does not work. Why?

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• Finding indexes of each element in a multidimensional array in ruby

  - by Shreyas Satish

  Eg :a=[["hello", "world"], ["good", "lord"], ["hello", "lord"]] I need to find and record the indexes of each word with respect to the super-array. i.e hello => 0,2 world => 0 lord => 1,2. here's my shot ,but its very amateurish and lengthy. all_tokens=tokens.flatten all_tokens.each do|keyword| tokens.each do|token_array| if token_array.include?keyword x << i end i=i+1 end y[k] = x.clone y=y.clear end

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• How can I concatenate corresponding lines in two files in Perl?

  - by Nano HE

  file1.txt hello tom well file2.txt world jerry done How to merge file1.txt with file2.txt; then create a new file - file3.txt hello world tom jerry well done thank you for reading and reply. Attached the completed code. #!/usr/bin/perl use strict; use warnings; open(F1,"<","1.txt") or die "Cannot open file1:$!\n"; open(F2,"<","2.txt") or die "Cannot open file2:$!\n"; open (MYFILE, '>>3.txt'); while(<F1>){ chomp; chomp(my $f2=<F2>); print MYFILE $_ . $f2 ."\n"; }

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• Errors while building ACE program

  - by karthi

  Hi i am new to ACE. i just started ACE with a "HELLO WORLD" program. It compiled successfully but while building it produces some of the errors.Can anyone help me. CODE: include include "ace/Log_Msg.h" include "ace/OS_main.h" int ACE_TMAIN(int argc, ACE_TCHAR *argv[]) { ACE_DEBUG((LM_DEBUG, "Hello World\n")); return 0; } ERROR: /tmp/cccwdbA0.o: In function main': hello.cpp:(.text+0xa): undefined reference toACE_Log_Msg::last_error_adapter()' hello.cpp:(.text+0x13): undefined reference to ACE_Log_Msg::instance()' hello.cpp:(.text+0x43): undefined reference toACE_Log_Msg::conditional_set(char const*, int, int, int)' hello.cpp:(.text+0x5f): undefined reference to `ACE_Log_Msg::log(ACE_Log_Priority, char const*, ...)' collect2: ld returned 1 exit status Compilation failed.

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• How to merge VB.NET WEB Project with C#.NET MVC project

  - by Thushara Perera

  Hi All, I've got an existing asp.net project written in vb.net need to merge into C# ASP.NET MVC 1.0 application. I couldn't find a good article on this. I have successfully created a sample project and merge it. It works successfully. But when merge it into my real project it does not work. I've used C#.csproj project file and deleted VB project file. for the merging i could find a good article this link successful on sample project not with the real project. good one: http://www.packtpub.com/article/mixing-asp.net-webforms-and-asp.net-mvc how it is possible to merge VB Default.aspx, C# Default.aspx and VB Global.asax, C# Global.asax. Can I used VB.vbproj file insted of csproj Thanks Thushara Perera

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• .NET Single Line Logging (ala Trace.Write/WriteLine) using Instrumentation.Logging

  - by KnownColor

  Hello Everyone, My question is whether it is possible to get line/multiline (very unsure of correct term for this) behaviour of the Trace.Write and Trace.WriteLine methods but using the Microsoft Instrumentation Logging framework in .NET 2.0. Desired Output Hello World! Oh Hai. What I Currently Have Trace.Write("Hello "); Trace.WriteLine("World!"); Trace.Write("Oh Hai."); I would prefer to use instrumentation to log rather than writing to a log file using Debug.Trace. EDIT: By Instrumentation Logging I mean using a 'loggingConfiguration' block in my App.config and writing Log Entries using using Microsoft.Practices.EnterpriseLibrary.Logging.Logger.Write(LogEntry logEntry); Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=2.0.0.0 for example. Ta, KnownColor

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• Polling versus socket servers for online Flash games

  - by justin

  Hi, I want to make an online flash game, it will have social features but the gameplay will be primarily single-player. For example, no two players will appear on the screen at once, the social interaction will be through asynchronous messages, there won't be real-time chat or anything. Much of the logic would happen in the client, the server would validate the client logic, but it wouldn't need to be totally synchronous, which is why I'm thinking polling might be satisfactory. I have read in many places that socket servers can be more efficient than using polling for online games, but is that mainly a consideration for games that are more multi-player with more mult-player interactions than the game I have descriebed? If many users are playing online at the same time, but each playing a relatively isolated game, and not interacting to in real-time with each players, could polling be okay, or would using sockets be advisable no matter what if you have an online game that you envision many people playing at the same time? Thanks!

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• NoSql Crash Course/Tutorial

  - by Chris Thompson

  Hi all, I've seen NoSQL pop up quite a bit on SO and I have a solid understanding of why you would use it (from here, Wikipedia, etc). This could be due to the lack of concrete and uniform definition of what it is (more of a paradigm than concrete implementation), but I'm struggling to wrap my head around how I would go about designing a system that would use it or how I would implement it in my system. I'm really stuck in a relational-db mindset thinking of things in terms of tables and joins... At any rate, does anybody know of a crash course/tutorial on a system that would use it (kind of a "hello world" for a NoSQL-based system) or a tutorial that takes an existing "Hello World" app based on SQL and converts it to NoSQL (not necessarily in code, but just a high-level explanation). I see this having one solid answer, but if you guys feel like it should be community wiki, I'll be happy to change it. Thanks! Chris

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• Why am I getting a segmentation fault when I use binmode with threads in Perl?

  - by jAndy

  Hi Folks, this call my $th = threads->create(\&print, "Hello thread World!\n"); $th->join(); works fine. But as soon as I add binmode(STDOUT, ":encoding(ISO-8859-1)"); to my script file, I get an error like "segmentation fault", "access denied". What is wrong to define an encoding type when trying to call a perl thread? Example: use strict; use warnings; use threads; binmode(STDOUT, ":encoding(ISO-8859-1)"); my $th = threads->create(\&print, "Hello thread World!\n"); $th->join(); sub print { print @_; } This code does not work for me. Kind Regards --Andy

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• PHP or Javascript or other - Draw simple shapes onto images?

  - by Tommo

  I basically have an image of a world map and i would like to place a pin image at a specified pixel co-ordinate ontop of this world map image. It's for a website, so ideally the solution should be in PHP or Javascript (i'm avoiding Java and Flash as i want it to be as simple as possible). I had a look at the processing.js library but it is way to big and bloated for just performing this simple task. Is there a pre-existing Javascript function which will allow me to do this? Or a more simple javascript library that i can use? (processing.js was a bit too advanced for me, i couldnt get it working lol) In terms of a PHP solution, i would prefer taking the load off the server and onto the client for this task, but i would still like to hear methods for doing it in PHP if they are suitable. Thanks!

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• What is a good book to use as a reference/learning resource for Specification and Description Langua

  - by michael

  What is a good book to use as a reference/learning resource for Specification and Description Language - Real Time?

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• Setting up a web developer lab for learning purposes

  - by Saleh Al-Abbas

  I'm not a developer by profession. Therefore, I'm not exposed to real world technical problems that face professional developers. I read/heard about web farms, integration between different systems, load balancing ... etc. Therefore, I was wondering if there are ways for the individual developer to create an environment that simulates real world situations with minimal number of machines like: web farms & caching simulating many users accessing your website (Pressure tests?) Performance load balancing anything you think I should consider. By the way, I have a server machine and 1 PC. and I don't mind investing in tools and software. PS. I'm using Microsoft technologies for development but I hope this is not a limiting factor. Thanks

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• http response to GET request - working in FF not Chromium

  - by Tyler

  For fun I'm trying to write a very simple server in C. When I send this response to Firefox it prints out the body "hello, world" but with Chromium it gives me a Error 100 (net::ERR_CONNECTION_CLOSED): Unknown error. This, I believe, is the relevant code: char *response = "HTTP/1.0 200 OK\r\nVary: Accept-Encoding, Accept-Language\r\nConnection: Close\r\nContent-Type: text/plain\r\nContent-Length:20\r\n\r\nhello, world"; if(send(new_fd, response, strlen(response), 0) == strlen(response)) { printf("sent\n"); }; close(new_fd); What am I missing? Thanks!

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• Are large include files like iostream efficient? (C++)

  - by Keand64

  Iostream, when all of the files it includes, the files that those include, and so on and so forth, adds up to about 3000 lines. Consider the hello world program, which needs no more functionality than to print something to the screen: #include <iostream> //+3000 lines right there. int main() { std::cout << "Hello, World!"; return 0; } this should be a very simple piece of code, but iostream adds 3000+ lines to a marginal piece of code. So, are these 3000+ lines of code really needed to simply display a single line to the screen, and if not, do they create a less efficient program than if I simply copied the relevant lines into the code?

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