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  • How to pass get-parameter to backing bean in jsf?

    - by Roman
    I have get parameter with name controller. When I try to pass it (with propertyChangeListener) to my backing bean I get null instead of the real value of the parameter: <h:commandButton value="#{msg['mail.send']}" styleClass="mailbutton" action="#{mailSender.sendMail}"> <f:setPropertyActionListener target="#{mailSender.controllerName}" value="{#param.controller}"/> </h:commandButton> So, I have two questions: What is the proper way to set bean property with a get-parameter value? Actually, I've already get the value from ExternalContext#getRequestParam but maybe there are some other solutions. More interesting question: why propertyActionListener didn't work here? What does it do actually? (again I have some thoughts about it but it would be nice to read more comprehensive explanations).

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  • Java Google App Engine inconsistent data lose after restarting dev server

    - by user259349
    Hello everyone, I am using Java GAE. So far, i'm just scafolding my data objects and i'm seeing an interesting issue. The records that i am playing around with are getting updated properly as long as my dev server is running up. The second that the my dev server gets restarted, i lose all of my changes. That would be not alarming if i lost all of my records, but, there was a point of time where my data persisted through the server restart. I'm worried that i would lose production data if i launched without fixing this potential bugs? ANy idea on wher ei should look?

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  • JBoss Seam: components injected into POJOs, but not Session Beans

    - by purecharger
    I have a Seam component that handles login, with the name "authenticator": @Name("authenticator") public class AuthenticatorAction implements Authenticator { @PersistenceContext private EntityManager em; @In(required=false) @Out(required=false, scope = SESSION) private User user; public boolean authenticate(){ ... } } This works just fine, Seam injects the EntityManager instance. However, as soon as I add the @Stateless annotation, none of the injection happens! In this case, the EntityManager instance is null upon entry to the authenticate() method. Another interesting note is that with a separate stateful session bean I have, the Logger instance in that class is only injected if I make it static. If i have it non-static, it is not injected. Thats fine for the logger, but for stateless session beans like that, I obviously can't have static member variables for these components. I'm confused because this authenticator is exactly how it is in the Seam booking example: a stateless session bean with a private member variable being injected. Any ideas?

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  • How to use Mobile Browser Definition File for a Phone vs SmartPhone seperation

    - by Denis Hoctor
    Hi all, I'm looking to revamp our mobile site with something simple for phones below the ambiguous smart phone category and something a little more interesting for the phones above this category. I'm not interested in WAP/WML for this project. I'm building a ASP.Net 4 MCV 2 app and using MBDF What I'd like to know is how best to define this differentiation when using MBDF? Screen size, Javascript, SpportsTouchScreen etc. are all in MBDF along with others but I'm not sure where to draw the line and where the data is most accurate for the broad number of devices. What do those of you out there developing for this spread of hardware & software split on? Thanks, Denis P.S. I've done my research on xHTML MP1.0 - 1.2 and the best practises for implementation to ensure broad coverage but I don't want to restrict the newer phones out there to what the base line can see.

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  • create an english test

    - by thienthai
    hi everyone, i want to create an english test software using window form and C# something like bellow: Hi David, Thanks for your e-mail. I hope things get easier for you before the weekend. You’ve been (be) really busy this week! 1 _______ (you / make) your vacation plans yet? Last May, I 2 _________(go) to Japan with my family again. We 3 _______ (be) there three times now! But this time, we 4 _______ (not stay) with my aunt in Tokyo. Instead, we 5 ______(drive) around to different places. Then in July, my friend Angie and I 6 ________ (travel) to Peru. 7 _______ (you / ever / be) there? It’s one of the most interesting places I 8 _______ (ever / visit). The ruins of Machu Picchu are amazing. Write soon! Mariko how can i display it in window form that we can fill the brackets (____) directly everyone help me thanks.

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  • Whats the scope of c code within objective-c classes?

    - by roja
    I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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  • jQuery in Opera User JS Doesn't Work

    - by Axonn
    Hello ::- ). I'm playing with some Opera User JS. I included "1jquery.min.js" in my User JS folder (1 in front because Opera loads them alphabetically). Unfortunately, it doesn't appear to be working. window.onload = OnWindowLoad; $(document).ready(function() { alert ($('#area_19')); }); function OnWindowLoad () { alert ($('#area_19')); alert(document.getElementById("area_19")); } What's interesting about this code is that the first two alerts come back in NULL, but the last one does find the object! So the element definitely exists in the page, but my jQuery seems unable to get it. What's even stranger is that the jQuery "ready" function works, indicating that I do have jQuery capability. I'm quite puzzled about all this ::- /. Hopefully somebody can give me a clue ::- ).

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  • How do you use scripting language (PHP, Python, etc) to improve your productivity?

    - by Edwin
    Hi, I'm a Delphi developer on the Windows platform, recently read the PHP tutorial at W3CSchools, it looks interesting. We all know scripting languages are very good at web site development, but I also want to utilize it to improve my productivity or get some tedious tasks done quickly, maybe some quick-and-dirty string/file processing? How do you usually do with scripting languages apart from software development? And we need a responsive, decent IDE/editor in order to gain productivity when writing scripts for this purpose? Thanks for in advance!

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  • Problem with Qt::QueuedConnection, signal delivered after disconnect

    - by lutku
    Hi, I just discovered interesting behavior of queued connection in Qt 4.6: First queued connection is made: connect(someSender, SIGNAL(completed()), this, SLOT(handleCompletion()), Qt::QueuedConnection) Then someSender sends the signal: emit completed() Before receiving signal (as it is in queue), I disconnect from the signal: disconnect(someSender, SIGNAL(completed()), this, SLOT(handleCompletion()) Still, handleCompletion slot is invoked at next eventloop iteration. I can prevent this from happening by using someSender-blockSignals(true) at correct point, but it feels awful not to mention having some boolean flag to disable slot's functionality. Especially, I feel amazed that this behavior is not mentioned in Qt documentation (at least I haven't found). Finally the question: any sensible way to avoid this from happening?

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  • Interface Builder and Xcode integration not working

    - by Martin Cote
    After having installed the iPhone SDK 3.1.2, Interface Builder is not in sync with Xcode anymore. The light indicator at the bottom of the XIB window is grey. IB doesn't see any files from the Xcode project. Xcode is always open when I start IB. I tried rebooting. No luck. I tried removing the preferences files for Xcode/IB. No luck. I tried reinstalling Xcode/IB. Still no luck. This page explains how IB monitors the changes in Xcode. While it was an interesting read, it didn't provide any help about how to investigate my problem. Any help would be appreciated. EDIT Here's additional information. I enabled the debug logs for launchd, and I noticed the following line that appears every time Interface Builder is started: [0x0-0x1b01b].com.apple.InterfaceBuilder3[315]: Couldn't open shared capabilities memory GSCapabilities (No such file or directory) This really seems to be related to my issue.

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  • .apk signing fails even with Sun JDK (java.lang.NoClassDefFoundError: com.android.jarutils.DebugKeyP

    - by ianweller
    I'm having an interesting problem signing my Android application, whether or not I'm using a debug key. Regardless of the JDK I have installed to /usr/bin/{java,keytool,jarsigner} (OpenJDK or Sun's JDK) it will always give the following output after compiling successfully: -package-debug-sign: [apkbuilder] Creating RemoteNotify-debug-unaligned.apk and signing it with a debug key... BUILD FAILED /home/ianweller/AndroidSDK/platforms/android-7/templates/android_rules.xml:281: The following error occurred while executing this line: /home/ianweller/AndroidSDK/platforms/android-7/templates/android_rules.xml:152: java.lang.NoClassDefFoundError: com.android.jarutils.DebugKeyProvider The application was built and signed just fine by Eclipse with the ADT plugin (even without Sun's JDK installed). I'm on Fedora 12. I'm wanting to get my code out of Eclipse and move it into a git repository, but being unable to build it from ant will not allow this to happen.

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  • How do I capture java.util.logging output in TestNG?

    - by Misha Koshelev
    Dear All: I am sorry just wanted to know if this was possible? I have discovered an interesting issue with JUnit and am looking for alternatives. Thank you Misha p.s. Here is JUnit issue: import org.junit.After import org.junit.Before import org.junit.Test import static org.junit.Assert.* class MyTestTest { @Before public void beforeTests() { println "Before" } @Test public void testLogin() { println "Before asdf" asdf println "After asdf" } @After public void logoutOfMyTest() { println "After" blah } } JUnit only reports error related to blah. Whereas TestNG reports both: import org.testng.annotations.* class MyTestTest { @BeforeClass public void beforeTests() { println "Before" } @Test public void testLogin() { println "Before asdf" asdf println "After asdf" } @AfterClass public void logoutOfMyTest() { println "After" blah } } Thank you! Misha

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  • Android ScrollView jumps around when setting child visibility to View.GONE

    - by Mike
    I have a ScrollView that contains an number of other views (TextViews, ImageViews, etc.). The ScrollView is taller than the screen. I have an AsyncTask that updates the children of the ScrollView based on an http response. I've discovered an interesting behavior that I can't figure out how to work around. If I set any of the children's visibilities to View.INVISIBLE as part of the AsyncTask.onPostExecute(), everything works fine. However, if I set any of the children's visibilities to View.GONE, the ScrollView jumps down from the top when onPostExecute() is called. Exactly how far seems to vary. I'm guessing that re-laying out the ScrollView is causing it to scroll away from the top for some reason. So the question is: is there a way to either prevent or work around this behavior? PS. Using ScrollView.jump(FOCUS_UP) as a workaround isn't ideal since that'll force the user to the top even if they had intended to scroll down.

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  • asp.net form validation. Server-side or client-side

    - by Jeroen
    Here's (i think) an interesting question. With AJAX more and more common i feel more and more like doing all form validation server-side. Picture a registration form pre-AJAX. You have all your validation client-side using the common asp validation controls and validation summery...except...checking username availability, check emailadress availability, captcha and what not. So you end up with 2 kinds of validation and so presenting the user with 2 different UI's at 2 different moments. 2 words come to my mind. Ugly. Inconsistent. So here's the question. Why not do all the validation server-side (using AJAX or not). (I'm not using JQuery yet, should i?)

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  • Is there any difference between md5 and sha1 in this situation?

    - by Vili
    It is known that 1. if ( md5(a) == md5(b) ) 2. then ( md5(a.z) == md5(b.z) ) 3. but ( md5(z.a) != md5(z.b) ) where the dots concatenate the strings. What happens in the second row if we change all the md5 to sha1? So: 1. if ( sha1(c) == sha1(d) ) 2. then ( sha1(c.z) ?= sha1(d.z) ) I couldn't find two different strings with same sha1, that's why I'm asking this. Are there any other interesting "rules" about sha1?

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  • Should entry level programmers be able to answer FizzBuzz?

    - by Bryan Rowe
    When interviewing entry level developers, I have used the FizzBuzz question as a type of acid test. Generally, I ask for a solution in pseudo-code or any language of their choice. If someone can't answer this question -- or get reasonably close, the interview generally ends shortly thereafter and we don't progress to more interesting code questions. In your opinion, is it fair/appropriate/accurate to filter entry-level staff in this manner? Should the average four year college graduate have a reasonable enough foundation to be able to throw up a pseudo-code solution of FizzBuzz?

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  • Is Stopwatch really broken?

    - by Jakub Šturc
    At MSDN page for Stopwatch class I discovered link to interesting article which makes following statement about Stopwatch: However there are some serious issues: This can be unreliable on a PC with multiple processors. Due to a bug in the BIOS, Start() and Stop() must be executed on the same processor to get a correct result. This is unreliable on processors that do not have a constant clock speed (most processors can reduce the clock speed to conserve energy). This is explained in detail here. I am little confused. I've seen tons of examples of using Stopwatch and nobody mention this drawbacks. How serious is this? Should I avoid using Stopwatch?

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  • WPF exception handling when launched from WinForms

    - by Sonic Soul
    so i came across this interesting article on WPF exception handling: http://srtsolutions.com/public/item/251263 it works by declaring DispatcherUnhandledException handler in xaml <application> node. but what if a WPF window is launched from win forms application? where can i declare a general exception handler? The problem is that when WPF crashes, it brings down the whole WinForms app with it. *Edit what if instead of launching the WPF window directly, i launched an "Application" which than defined a start window?? is that possible/advisable?

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  • Best way to learn how to use FPGAs

    - by Myrrdyn
    In next weeks probably I will have some little FPGA to play with. I have a programmer background (C, C++, Java mostly) and some (very) limited experience in electronics. What are the best tools to know if you want to develop on FPGAs? What are the best languages to study? (what HW description languages?) Have you some examples of little "toy projects" that can be interesting, easy, and "eye-opener"? Thanks in advance. Edit: More details: if I understood correctly, the device I will be playing on will have an ARM core (no idea which one) and a 300k gates FPGA I'm looking specifically at some Linux free sw / open source tools...

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  • haystack's RealTimeSearchIndex causes django to hang on data entry

    - by lsc
    I'm using django-haystack and a xapian backend with real time indexing (haystack.indexes.RealTimeSearchIndexing) of model data and it works fine on my Ubuntu server. However, it causes django to hang upon data entry when I deployed the app on a RHEL5 server. Everything is hunky dory if I switch to a standard SearchIndex. Running ./manage.py rebuild_index manually works fine too. The major differences between the two setups would be the versions of Python (2.4.3 vs 2.6.4) and the xapian (1.0.4-1 vs 1.0.15). Any suggestions on what may be the problem? Nothing interesting appears in the logs, and I've tried different databases (mysql, sqlite3) and deployment methods (mod_python, wsgi) with no luck yet. I have noted the warning on the haystack docs stating that RealTimeSearchIndex is only handled gracefully with a Solr backend, however I'm running a very traffic site with only occasional writes so I'm fine with some CPU overheads on writes.

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  • Can you tune C runtime heap segment reservation size on XP?

    - by Jason
    When the VC6 C runtime on XP can't serve an allocation request within an existing heap segment, it reserves a new segment. The size of these new segments increase by factors of 2 (until there are not large enough free areas to do that, at which point it falls down to smaller segments.) In any case, is there any way to control this behavior on XP with the VC6 runtime? For example, doubling up to a point, but capping at 64MB segments. If there is no way on XP but there is on 7, that would be good to know too. Or if there is no way on VC6 but there is on VC8 or up would be interesting.

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  • What is the best area for freelance / small business developer work - and how to find it

    - by Olav
    Most freelance developers are essentially contractors - working full time and often hired through another company. What are the best options for real freelancing or small business built around development skills? (I am only looking for local clients, odesk etc is not interesting) Most options open for small companies are web sites. But most clients don't want to pay much, and there are lots of people that are willing to do it for very little money. Think if you want to do money that way you must be a "web site" business. Think the best option should be to work for companies spending a lot of resources on web and db? How could I get in touch with them? Other ideas? Part of my concept is to use some off-shoring to complement my skillset, so i should be able to do PHP or Drupal even if I am not at expert level.

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  • file_column not creating files, just empty tmp directory

    - by Yanaek
    Up to the end of December 2009 everything worked fine, so i assume that after some upgrades on servers (Ubuntu 8.10 and second Ubuntu 9.10) something stopped working. Model: class Product < ActiveRecord::Base belongs_to :category file_column :thumbnail, :magick = { :geometry = "150x100" } there is of course table 'products' in database, and it has column 'thumbnail' what's interesting that File actually is uploaded to server, it goes to the /tmp directory under RackMultipartXXXX-0 name, and it is unmodified image. The problem is, that then this file is not moved to 'tmp' dir under RAILS_ROOT/public/product/ nor the 'XX' (where xx means ID of a product) under public/product also. i don't know what to do, i spend few HOURS trying different versions of file_column, also trying to make new, test rails application only from scaffold, but then, in this new application problem was the same

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  • OpenMP + SSE gives no speedup

    - by Sayan Ghosh
    Hi, My Professor found out this interesting experiment of 3D Linearly separable Kernel Convolution using SSE and OpenMP, and gave the task to me to benchmark the statistics on our system. The author claims a crazy 18 fold speedup from the serial approach! Might not be always, but we were expecting at least a 2-4 times speedup running this on a Dual Core Intel. http://software.intel.com/en-us/articles/16bit-3d-convolution-sse4openmp-implementation-on-penryn-cpu/#comment-41994 Alas, we could find exactly no speedup. The serial code performs always better, with or without OpenMP. I am using Linux, and observed a certain trend...when no other processes are running on the system, after a while the loadavg starts increasing, and the the %CPU utilization falls down. Another probable false positive which I ran into accidentally...I started the program, then immediately paused it. Then I ran it on background with bg, and saw a speedup of more than 2. This happens all the time! Any advice would be great. Thanks, Sayan

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  • For reliable code, NModel, Spec Explorer, F# or other?

    - by ja
    I've got a business app in C#, with unit tests. Can I increase the reliability and cut down on my testing time and expense by using NModel or Spec Explorer? Alternately, if I were to rewrite it in F# (or even Haskell), what kinds (if any) of reliability increase might I see? Code Contracts? ASML? I realize this is subjective, and possibly argumentative, so please back up your answers with data, if possible. :) Or maybe an worked example, such as Eric Evans Cargo Shipping System? If we consider Unit tests to be pecific and strong theorems, checked quasi-statically on particular “interesting instances” and Types to be general but weak theorems (usually checked statically), and contracts to be general and strong theorems, checked dynamically for particular instances that occur during regular program operation (from B. Pierce's Types Considered Harmful, where do these other tools fit? We could pose the analogous question for Java, using Java PathFinder, Scala, etc.

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