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• Why I get java.net.SocketException: Connection reset

  - by Jammy

  I need sent some requests to server side and get reponse, sometimes when I call specific method to run the flollowing common code, I get one error in line(addToCookieJar(connection);), any idea how this get happened? URL url = new URL(providerURL); HttpURLConnection connection = (HttpURLConnection)url.openConnection(); connection.setRequestMethod("POST"); connection.setDoInput(true); connection.setDoOutput(true); connection.setUseCaches(false); connection.setRequestProperty("Content-Type", "application/octet-stream"); // We understand gzip encoding connection.addRequestProperty("Accept-Encoding", "gzip"); if (cookie != null && cookieHandler != null) { connection.setRequestProperty("Cookie", cookie); } if (cookieHandler == null) { addFromCookieJar(connection); } // Send the request ObjectOutputStream oos = new ObjectOutputStream(connection.getOutputStream()); oos.writeObject(remote.getName()); oos.writeObject(m.getName()); // method name oos.writeObject(m.getParameterTypes()); // formal parameters oos.writeObject(args); // actual parameters oos.flush(); oos.close(); if (cookieHandler == null) { cookieJar.put(new URI(providerURL), connection.getHeaderFields()); } Exception: java.lang.reflect.UndeclaredThrowableException at $Proxy0.updateDocument(Unknown Source) at com.agst.ui.gantt.GanttPanel.doUpdateDocument(GanttPanel.java:1931) at com.agst.ui.gantt.GanttPanel.save(GanttPanel.java:1419) at com.agst.ui.gantt.GanttPanel$4.run(GanttPanel.java:1673) at java.lang.Thread.run(Unknown Source) Caused by: java.net.SocketException: Connection reset at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at com.agst.rmi.RemoteCallHandler.call(RemoteCallHandler.java:196) at com.agst.rmi.RemoteCallHandler.invoke(RemoteCallHandler.java:142) ... 5 more Caused by: java.net.SocketException: Connection reset at java.net.SocketInputStream.read(Unknown Source) at java.io.BufferedInputStream.fill(Unknown Source) at java.io.BufferedInputStream.read1(Unknown Source) at java.io.BufferedInputStream.read(Unknown Source) at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getHeaderFields(Unknown Source) at com.agst.rmi.RemoteCallHandler.addToCookieJar(RemoteCallHandler.java:529) at com.agst.rmi.RemoteCallHandler.call(RemoteCallHandler.java:192) ... 6 more

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• Regular Expression for CSV with numbers

  - by Bernie Perez

  I'm looking for some regular expression to help parse my CSV file. The file has lines of number,number number,number Comment I want to skip number,number number,number Ex: 319,5446 564425,87 Text to skip 27,765564 I read each line into a string and I wanted to use some regular express to make sure the line matches the pattern of (number,number). If not then don't use the line.

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• Java3d resetting to a new scene

  - by Dan Howard

  Hi all, I'm working on a game in Java3D. I read all my level info from a file and it works fine. But now I want to re-initialize the scene from reading data from a different file. How do I reset the scene? Should I just destroy the whole canvas3D and universe objects?

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• writing a program to ban a user (by MAC address) from a network

  - by Gail

  I'm not sure if this is possible at the application layer. Can a program be written to read and analyze packets (maybe interfacing with wireshark through it's lua api) and ban MAC addresses with suspicious network traffic? (defining suspicious network traffic as packet injection patterns similar to known attacks)

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• C: how to redirect stderr from System-command to stdout or file?

  - by user355926

  The shell command $ avrdude -c usbtiny outputs text to stderr. I cannot read it with commmands such as head-less-more cos it is not stdout. I want the text to stdout or to a file. How can I do it in C? I have tried to solve the problem by my last question but still unsolved.

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• Antialiasing algorithm

  - by y_nk

  Hello, I'm looking for a good way to antialias a bitmap i'm generating with actionscript3. My goal would be to achieve this processing from scratch. I read a lot on the subject but the most common algorithm are looking too loud to work properly within my swf, because i'm using a scale2x algorithm to smooth the edges of my shape. It doesn't have to be colorfull, since my shape is black and white ! Any hint would be appreciated, thanks :)

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• How should I handle url routing in my application ?

  - by phmr

  I'm building a web app with custom components. I need a way to route requests to class / methods, is there any standalone java library that can achieve that (in a sexy manner [1]) ? [1] read : no xml!

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• Should an event-sourced aggregate root have access to the event sourcing repository?

  - by JD Courtoy

  I'm working on an event-sourced CQRS implementation, using DDD in the application / domain layer. I have an object model that looks like this: public class Person : AggregateRootBase { private Guid? _bookingId; public Person(Identification identification) { Apply(new PersonCreatedEvent(identification)); } public Booking CreateBooking() { // Enforce Person invariants var booking = new Booking(); Apply(new PersonBookedEvent(booking.Id)); return booking; } public void Release() { // Enforce Person invariants // Should we load the booking here from the aggregate repository? // We need to ensure that booking is released as well. var booking = BookingRepository.Load(_bookingId); booking.Release(); Apply(new PersonReleasedEvent(_bookingId)); } [EventHandler] public void Handle(PersonBookedEvent @event) { _bookingId = @event.BookingId; } [EventHandler] public void Handle(PersonReleasedEvent @event) { _bookingId = null; } } public class Booking : AggregateRootBase { private DateTime _bookingDate; private DateTime? _releaseDate; public Booking() { //Enforce invariants Apply(new BookingCreatedEvent()); } public void Release() { //Enforce invariants Apply(new BookingReleasedEvent()); } [EventHandler] public void Handle(BookingCreatedEvent @event) { _bookingDate = SystemTime.Now(); } [EventHandler] public void Handle(BookingReleasedEvent @event) { _releaseDate = SystemTime.Now(); } // Some other business activities unrelated to a person } With my understanding of DDD so far, both Person and Booking are seperate aggregate roots for two reasons: There are times when business components will pull Booking objects separately from the database. (ie, a person that has been released has a previous booking modified due to incorrect information). There should not be locking contention between Person and Booking whenever a Booking needs to be updated. One other business requirement is that a Booking can never occur for a Person more than once at a time. Due to this, I'm concerned about querying the query database on the read side as there could potentially be some inconsistency there (due to using CQRS and having an eventually consistent read database). Should the aggregate roots be allowed to query the event-sourced backing store by id for objects (lazy-loading them as needed)? Are there any other avenues of implementation that would make more sense?

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• [Haskell]Curious about the Hash Table problem

  - by astamatto

  I read that hash tables in haskell are crippled ( citation: http://flyingfrogblog.blogspot.com/2009/04/more-on-haskells-hash-table-problems.html ) and since i like haskell it worried me. Since the blog-post one year has passed and im curious, The hash table problem in haskell was "fixed" in the traditional compilers? (like ghc) ps: I love stack overflow, im a long time visitor but only today i decided to try to post a question.

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• Virtual functions should not be used excessively - Why ?

  - by GG

  I just read that we should not use virtual function excessively. People felt that less virtual functions tends to have fewer bugs and reduces maintenance. I'm not able to get what kind of bugs and disadvantages can appear due to virtual functions. Thanks,

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• Is the foobar:finished:context: method of UIView animations delegate really giving a BOOL for finish

  - by mystify

  Althoug I read everywhere that the method signature has a BOOL for finished, I do never get a false. It is always true. And now the strange thing: When I NSLog that out with %d, it is always either 32 or 40. Other BOOLs I have are either 1 or 0. That makes no sense. So: Not a bool, right? What's that instead, really?

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• Programming language detection in PHP

  - by nandu

  I need to detect which programming language is used in a code snippet, there is any library to do this? I already read this http://stackoverflow.com/questions/475033/detecting-programming-language-from-a-snippe, but I rather use a tested and working library.

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• Reading CSV when column having numeric and alphanumeric values

  - by Sudhakar

  Hi, In CSV file, Column is having some times numeric values and some times alphanumeric values. when try to read the CSV files to DATASET, alphanumeric values is showing as null(Blank). How to see alphanumeric values? Thanks

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• HTTPS intercept

  - by Adrian

  I don't know much about SSL, but I've read something and I was wondering if it's possible to intercept the communication between client and server (for example, a company can monitor employees data transfer?). I thought it was a difficult task, but it looks like that it is very simple. When a client requests a https connection the router can be instructed to intercept the key exchange and send to the server and the client it's own public keys (further it can encode/decode the hole traffic). Is it true, or I'm misunderstanding something?

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• Most efficient way to have a 50 state drop down box in Drupal Forms

  - by user363036

  I know that one way is to have a table in database with all the states and then you would read it in your form. Is there any easier way in your opinion guys ? I feel bad asking for something like this since it is so elementary however I would suppose something as simple like this would already be implemented in Drupal.

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• What to put in a python module docstring?

  - by 007brendan

  Ok, so I've read both PEP 8 and PEP 257, and I've written lots of docstrings for functions and classes, but I'm a little unsure about what should go in a module docstring. I figured, at a minimum, it should document the functions and classes that the module exports, but I've also seen a few modules that list author names, copyright information, etc. Does anyone have an example of how a good python docstring should be structured?

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• [OutputCache] for a function in .net 4

  - by HasanGursoy

  Hi, I read at Scottgu blog about using OutputCache for a function but this didn't worked for me. How can I use [OutputCache(Duration=60)] for a function and can I add VaryByParam in this statement? Which namespace is required?

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• Please Explain .NET Delegates

  - by user275561

  So I read MSDN and Stack Overflow. I understand what the Action Delegate does in general but it is not clicking no matter how many examples I do. In general, the same goes for the idea of delegates. So here is my question. When you have a function like this: public GetCustomers(Action<IEnumerable<Customer>,Exception> callBack) { } What is this, and what should I pass to it?

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• iphone xml handing

  - by Mitch

  I want my app to read a XML via internet. Also I want to keep the previously download xml so next time I may not need to download again until certain hours is passed or whatever period of time according to settings. Do you recommend me to download it first and store locally before process it? Or should I process it while downloading (with libxml2 I guess)? What do you usually with apps using remote XML? Targeting 3.0 devices btw.

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• VS2010 Upgrade Edition - is 'upgrading' from express ligitimate?

  - by Pete

  Hi, I've read from a non reliable source that purchasing VS2010 Upgrade Edition (As opposed to full retail) is a valid licensing route when 'upgrading' from VS Express (free) - Can anyone confirm or refute this? Thank you

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• How to register for callbacks on a DB4O server?

  - by Simon

  I have a DB4O server listening on a port IObjectServer server = Db4oClientServer.OpenServer("filename.db40", 11978); How do i register for callbacks? For example how do i execute some custom code before an object is read or stored?

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• SerialVersionUID with "private static final long" still gets InvalidClassException

  - by Buggieboy

  I have compiled and jarred the various projects in my Java application, generating serialVersionUIDs automatically through Eclipse for all my classes derived from Serializable. I read the answers to this question, and verified that serialVersionUids are all private static final long. Nevertheless, I get an error like this when I try to run: java.io.InvalidClassException: com.acme.product.Widget; local class incompatible: stream classdesc serialVersionUID = 5226096973188250357, local class serialVersionUID = -5432967318654384362 What am I missing?

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• php url routing question

  - by Ahmet vardar

  Hi, http://mysite.com/songs/company-name/song-name i want to redirect it to http://mysite.com/songs/index.php?name=company-name&song=song-name i read some articles about that mod_rewrite but actually i couldnt understand exactyly, i appreciate if you can help me. thanks

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• .NET Regex Instance Caching

  - by jvenema

  I've read this article, which describes how instance vs static methods get called with a .NET regex. However, what about if the instance itself is static? Does anyone know if .NET does any sort of caching that could potentially cause a memory leak?

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• readonly in asp.net mvc

  - by user281180

  How do I make a textbox read only in mvc? I have included the following snippet, but it`s not working. <%=Html.Textbox("test", "test", new { style="border: 0px; width:280px" ;readonly=true}%>

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