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• Problem with Tapestry palette's arrow icons in IE8

  - by JellyHead

  I'm using Tapestry to create pages for a web app, and have been using the palette component to add/delete items to/from a group. The page looks great in Firefox (Tapestry seems biased towards Firefox), but my customers will all be using Internet Explorer (any versions from 6, 7, & 8) and in IE8, the disabled arrow buttons look awful. In Firefox, they are faded, using an opacity setting of 25%, but this doesn't work in IE8 and instead you get a faded image with an ugly black border around the image. In tapestry-core's stylesheet (default.css), you have the following for a disabled arrow button. DIV.t-palette-controls BUTTON[disabled] IMG { filter: alpha(opacity = 25); -moz-opacity: .25; } These are clearly out of date, as -moz-opacity is no longer supported by Firefox (use opacity: 25 instead). The problem is with filter: "alpha(opacity = 25);". If I remove this, the arrows look fine in IE8, but they are not faded. I got the magic instruction: -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(opacity=25)"; from various websites, but putting this in does not work either - the arrow icons are ugly again. The icon itself (distributed with Tapestry) just seems to be a regular PNG, but I'm not an expert on image formats, so maybe there's a problem there? Anyone else had this problem?

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• GWT JsonpRequestBuilder Timeout issue

  - by Anthony Kong

  I am getting time out from using JsonpRequestBuilder. The entry point code goes like this: // private static final String SERVER_URL = "http://localhost:8094/data/view/"; private static final String SERVER_URL = "http://www.google.com/calendar/feeds/[email protected]/public/full?alt=json-in-script&callback=insertAgenda&orderby=starttime&max-results=15&singleevents=true&sortorder=ascending&futureevents=true"; private static final String SERVER_ERROR = "An error occurred while " + "attempting to contact the server. Please check your network " + "connection and try again."; /** * This is the entry point method. */ public void onModuleLoad() { JsonpRequestBuilder requestBuilder = new JsonpRequestBuilder(); // requestBuilder.setTimeout(10000); requestBuilder.requestObject(SERVER_URL, new Jazz10RequestCallback()); } class Jazz10RequestCallback implements AsyncCallback<Article> { @Override public void onFailure(Throwable caught) { Window.alert("Failed to send the message: " + caught.getMessage()); } @Override public void onSuccess(Article result) { // TODO Auto-generated method stub Window.alert(result.toString()); } The article class is simply: import com.google.gwt.core.client.JavaScriptObject; public class Article extends JavaScriptObject { protected Article() {}; } The gwt page, however, always hit the onFailure() callback and show this alert: Failed to send the message. Timeout while calling <url>. Fail to see anything on the Eclipse plugin console. I tried the url and it works perfectly. Would appreciate any tip on debugging technique or suggestion

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• Need help troubleshooting why Solr wont start (or why solr admin page wont show)

  - by Camran

  I can't get Solr working. I have Jetty, and my server OS is Ubuntu 9.10. It is a VPS server. So, when I execute the java -jar start.jar everything seems fine. I even do a netstat to check if there are any listeners on the port before the start and after the start, and it seems solr is starting. However, I cant access the admin page. I have even turned off the firewall. Here is some info about my server: I have changed DocumentRoot to var/www/SV/ I have Apache2, PHP5, MySql installed I have "disabled" iptables firewall I have removed the htaccess files (I used them to passw protect my site under develop) I have installed JRE (NOT JDK) on my server. I use the "example" which comes with Solr, so I use Jetty as container on my Server. My Server has 768MB RAM Doing a java -version command shows this: java version "1.6.0_15" Java(TM) SE Runtime Environment (build 1.6.0_15-b03) Java HotSpot(TM) Client VM (build 14.1-b02, mixed mode) And in the terminal the last lines when executing start.jar is: May 29, 2010 1:30:03 PM org.apache.solr.core.SolrCore registerSearcher INFO: [] Registered new searcher Searcher@1dc64a5 main NOTE: Also before this last line, there is a line which makes me suspicious: Started SocketConnector @ 0.0.0.0:8983 // Should this be with leading zeros? Is there any ways you know to troubleshoot this? Memory issue maybe? Thanks

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• WebBrowser control won't display an https site that IE8 on the same PC will

  - by Velika

  In IE8, I get the follow warning, but if I choose to continue the site displays properly. There is a problem with this website's security certificate. The security certificate presented by this website was issued for a different website's address. Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server. We recommend that you close this webpage and do not continue to this website. Click here to close this webpage. Continue to this website (not recommended). More information In the WebBrowser control, I get this at first: Navigation to the webpage was canceled What you can try: Refresh the page. When I hit the refresh teh page, this time, I get the same wanting as I originally get in IE8, but when I click "Continue to this website (not recommended)", the page refresh again, displaying the same warning. What can I do to get the site to display in the WebBrowser control as it does in IE8. I would've thought that the control would be using the same core logic and therefore expected the same result.

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• Error with masterpage

  - by Raphyboy

  Hi, i'm creating a brand new masterpage with VS2010 Beta 2 and I get this warning (that causes me errors in the content pages): Validation (XHTML 1.0 Transitional): Content is not supported outside 'script' or 'asp:content' regions. The masterpage's code : <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Bob.master.cs" Inherits="TShirtFactory.Web.All.Core.lib.masterpage.Bob" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <asp:ContentPlaceHolder ID="head" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server"> <div> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> </form> </body> </html> As you can see, it's the default masterpage generated code. I get the warning when I hover the tag at top. Does anybody have an idea of what's going on ? Thank you

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• Most efficient way of creating tree from adjacency list

  - by Jeff Meatball Yang

  I have an adjacency list of objects (rows loaded from SQL database with the key and it's parent key) that I need to use to build an unordered tree. It's guaranteed to not have cycles. This is taking wayyy too long (processed only ~3K out of 870K nodes in about 5 minutes). Running on my workstation Core 2 Duo with plenty of RAM. Any ideas on how to make this faster? public class StampHierarchy { private StampNode _root; private SortedList<int, StampNode> _keyNodeIndex; // takes a list of nodes and builds a tree // starting at _root private void BuildHierarchy(List<StampNode> nodes) { Stack<StampNode> processor = new Stack<StampNode>(); _keyNodeIndex = new SortedList<int, StampNode>(nodes.Count); // find the root _root = nodes.Find(n => n.Parent == 0); // find children... processor.Push(_root); while (processor.Count != 0) { StampNode current = processor.Pop(); // keep a direct link to the node via the key _keyNodeIndex.Add(current.Key, current); // add children current.Children.AddRange(nodes.Where(n => n.Parent == current.Key)); // queue the children foreach (StampNode child in current.Children) { processor.Push(child); nodes.Remove(child); // thought this might help the Where above } } } } public class StampNode { // properties: int Key, int Parent, string Name, List<StampNode> Children }

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• Linux Kernel programming: trying to get vm_area_struct->vm_start crashes kernel

  - by confusedKid

  Hi, this is for an assignment at school, where I need to determine the size of the processes on the system using a system call. My code is as follows: ... struct task_struct *p; struct vm_area_struct *v; struct mm_struct *m; read_lock(&tasklist_lock); for_each_process(p) { printk("%ld\n", p->pid); m = p->mm; v = m->mmap; long start = v->vm_start; printk("vm_start is %ld\n", start); } read_unlock(&tasklist_lock); ... When I run a user level program that calls this system call, the output that I get is: 1 vm_start is 134512640 2 EIP: 0073:[<0806e352] CPU: 0 Not tainted ESP: 007b:0f7ecf04 EFLAGS: 00010246 Not tainted EAX: 00000000 EBX: 0fc587c0 ECX: 081fbb58 EDX: 00000000 ESI: bf88efe0 EDI: 0f482284 EBP: 0f7ecf10 DS: 007b ES: 007b 081f9bc0: [<08069ae8] show_regs+0xb4/0xb9 081f9bec: [<080587ac] segv+0x225/0x23d 081f9c8c: [<08058582] segv_handler+0x4f/0x54 081f9cac: [<08067453] sig_handler_common_skas+0xb7/0xd4 081f9cd4: [<08064748] sig_handler+0x34/0x44 081f9cec: [<080648b5] handle_signal+0x4c/0x7a 081f9d0c: [<08066227] hard_handler+0xf/0x14 081f9d1c: [<00776420] 0x776420 Kernel panic - not syncing: Kernel mode fault at addr 0x0, ip 0x806e352 EIP: 0073:[<400ea0f2] CPU: 0 Not tainted ESP: 007b:bf88ef9c EFLAGS: 00000246 Not tainted EAX: ffffffda EBX: 00000000 ECX: bf88efc8 EDX: 080483c8 ESI: 00000000 EDI: bf88efe0 EBP: bf88f038 DS: 007b ES: 007b 081f9b28: [<08069ae8] show_regs+0xb4/0xb9 081f9b54: [<08058a1a] panic_exit+0x25/0x3f 081f9b68: [<08084f54] notifier_call_chain+0x21/0x46 081f9b88: [<08084fef] __atomic_notifier_call_chain+0x17/0x19 081f9ba4: [<08085006] atomic_notifier_call_chain+0x15/0x17 081f9bc0: [<0807039a] panic+0x52/0xd8 081f9be0: [<080587ba] segv+0x233/0x23d 081f9c8c: [<08058582] segv_handler+0x4f/0x54 081f9cac: [<08067453] sig_handler_common_skas+0xb7/0xd4 081f9cd4: [<08064748] sig_handler+0x34/0x44 081f9cec: [<080648b5] handle_signal+0x4c/0x7a 081f9d0c: [<08066227] hard_handler+0xf/0x14 081f9d1c: [<00776420] 0x776420 The first process (pid = 1) gave me the vm_start without any problems, but when I try to access the second process, the kernel crashes. Can anyone tell me what's wrong, and maybe how to fix it as well? Thanks a lot! (sorry for the bad formatting....) edit: This is done in a Fedora 2.6 core in an uml environment.

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• Is there a workaround for JDBC w/liquibase and MySQL session variables & client side SQL instructions

  - by David

  Slowly building a starter changeSet xml file for one of three of my employer's primary schema's. The only show stopper has been incorporating the sizable library of MySQL stored procedures to be managed by liquibase. One sproc has been somewhat of a pain to deal with: The first few statements go like use TargetSchema; select "-- explanatory inline comment thats actually useful --" into vDummy; set @@session.sql_mode='TRADITIONAL' ; drop procedure if exists adm_delete_stats ; delimiter $$ create procedure adm_delete_stats( ...rest of sproc I cut out the use statement as its counter-productive, but real issue is the set @@session.sql_mode statement which causes an exception like liquibase.exception.MigrationFailedException: Migration failed for change set ./foobarSchema/sprocs/adm_delete_stats.xml::1293560556-151::dward_autogen dward: Reason: liquibase.exception.DatabaseException: Error executing SQL ... And then the delimiter statement is another stumbling block. Doing do dilligence research I found this rejected MySQL bug report here and this MySQL forum thread that goes a little bit more in depth to the problem here. Is there anyway I can use the sproc scripts that currently exist with Liquibase or would I have to re-write several hundred stored procedures? I've tried createProcedure, sqlFile, and sql liquibase tags without much luck as I think the core issue is that set, delimiter, and similar SQL commands are meant to be interpreted and acted upon by the client side interpreter before being delivered to the server.

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• Problem with messages framework in Django 1.2

  - by Konstantin

  Hello! I'm running Django 1.2 beta and trying out the new feature: message framework. http://docs.djangoproject.com/en/dev/ref/contrib/messages/ Everything seems to work, but when I try to output the messages, I get nothing. Seems that messages variable is empty. I double checked all the settings, they seem to be just like in the manual. What could be wrong? settings.py MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', #send messages to users 'django.middleware.locale.LocaleMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', #debug tool 'debug_toolbar.middleware.DebugToolbarMiddleware', ) TEMPLATE_CONTEXT_PROCESSORS = ( 'django.contrib.messages.context_processors.messages', #send messages to users 'django.core.context_processors.auth', ) #Store messages in sessions MESSAGE_STORAGE = 'django.contrib.messages.storage.session.SessionStorage'; INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', #'django.contrib.sites', 'django.contrib.admin', 'django.contrib.messages', 'debug_toolbar', #my apps #... ) views.py def myview(request): from django.contrib import messages messages.error(request, 'error test'); messages.success(request, 'success test'); return render_to_response('mytemplate.html', locals()); mytemplate.html {% for message in messages %} {{ message }}<br /> {% endfor %} In template nothing is outputted.

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• Front End Developer v/s PHP-MySQL Engineer

  - by user301943

  Hello, I want to decide which of this would be a more viable career option? I am ready to quit my current job and hence I am looking for new opportunity. Current job is maintainence and no more active development. My current role is of a PHP/MySQL Developer. I very well understand web-programming and am comfortable with RoR/Sinatra/Zend MVC/JQuery/JSON manipulation, etc. I understand MySQL InnoDB/MyISAM engine and how one differs from the other, etc. Basically, I could very well manage the deployment of a web-application end-to-end including configuration of Apache/Nginx servers, memcache,etc On the other hand, I am being offered a Sr.Front End Web developer that would require me to extensively write HTML/CSS crossbrowser/crossplatform compliant code. I very well understand XHTML/CSS/Box model etc. I would be working on Drupal for the management of websites. While I understand continuing to work on server-side technologies would always be a good career path, how would the role of Core front-end developer turn out to be? If I take this opportunity, will I eventually get a chance to focus onto UCD, HCI, Information Architect,etc. So are these kinda roles possible if I focus on front end development? No offenses to the Front end developers, just want to understand if this is something I want to gain a mastery over. I have 2 yrs of industry experience after graduating with a MS-Computer Science. Although, I have a CS degree, if I were to take uip serious front-end role; I could probably go back and take up some design/HCI/UI courses. Please advise.

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• Practical value for concurrent-request-timeout parameter

  - by Andrei

  In the Seam Reference Guide, one can find this paragraph: We can set a sensible default for the concurrent request timeout (in ms) in components.xml: <core:manager concurrent-request-timeout="500" /> However, we found that 500 ms is not nearly enough time for most of the cases we had to deal with, especially with the severe restriction seam places on conversation access. In our application we have a combination of page scoped ajax requests (triggered by various use actions), some global scoped polling notification logic (part of the header, so included in every page) and regular links that invoke actions and/or navigate to other pages. Therefore, we get the dreaded concurrent access to conversation exception way too often, even without any significant load on the site. After researching the options for quite a bit, we ended up bumping this value to several seconds (we're debating whether to bump it up to 10s), as none of the recommended solutions seemed able to solve our issue completely (even forcing a global queue for all the ajax requests would still leave us exposed to a user deciding to click a link right when one of our polling calls was in progress). And we'd much rather have the users wait for a second or two instead of getting an error page just because they clicked a link at the wrong moment. And now to the question: is there something obvious we're missing (like a way to allow concurrent access to conversations and taking care of the needed locking ourselves, for instance :)? How do people solve this problem (ajax requests mixed with user driven interaction) in seam? Disabling all the links on the page while ajax requests are in progress (as suggested by one blog page) is really not a viable option. Any other suggestions? TIA, Andrei

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• Silverlight 4, Out of browser, Printing, Automatic updates

  - by minal

  I have a very critial business application presently running using Winforms. The application is a very core UI shell. It accepts input data, calls a webservice on my server to do the computation, displays the results on the winforms app and finally send a print stream to the printer. Presently the application is deployed using Click-once. Moving forward, I am trying to contemplate wheather I should move the application into a Silverlight application. Couple of reasons I am thinking silverlight. Gives clients the feel that it is a cloud based solution. Can be accessed from any PC. While the clickonce app is able to do this as well, they have to install an app, and when updates are available they have to click "Yes" to update. The application presently has a drop down list of customers, this list has expanded to over 3000 records. Scrolling through the list is very painful. With Silverlight I am thinking of the auto complete ability. Out of the browser - this will be handy for those users who use the app daily. I haven't used Silverlight previous hence looking for some expert advice on a few things: Printing - does silverlight allow sending raw print data to the printer. The application prints to a Zebra Thermal label printer. I have to send raw bytes to the printer with the commands. Can this be done with SL, or will it always prompt the "Print" dialog? Out of browser - when SL apps are installed as out of browser, how to updates come through, does the app update automatically or is the user prompted to opt for update?

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• jquery slider control issue

  - by Geetha

  Hi All, I am using slider control to create a progress bar for media player. Problem: the max value and slider size is not matching. The video get complete before it reaches the end of the slider. Code: <script type="text/javascript" src="js/jquery.ui.core.js"></script> <script type="text/javascript" src="js/jquery.ui.slider.js"></script> <link type="text/css" href="CSS/demos.css" rel="stylesheet" /> <link type="text/css" href="CSS/jquery-ui.css" rel="stylesheet" /> $('#slider-constraints').slider("value", 0); $('#slider-constraints').slider("constraints", [0, 0]); $("#slider-constraints").slider({ max: document.mediaPlayer.SelectionEnd, animate: true, range: $R(0, document.mediaPlayer.SelectionEnd), values:(0,document.mediaPlayer.SelectionEnd), value: val, enforceConstraints: false, slide: function(event, ui) { document.mediaPlayer.currentPosition = ui.value; $('#slider-constraints').slider("constraints", [0, ui.value]); $('#slider-constraints').slider("value", ui.value); }, start: function(event, index) { document.mediaPlayer.currentPosition = index.value; $('#slider-constraints').slider("constraints", [0, index.value]); $('#slider-constraints').slider("value", index.value); } }); } // Haldler position window.setInterval(function() { if (document.mediaPlayer.PlayState != 2 && document.mediaPlayer.PlayState == 0) { $('#slider-constraints').slider("constraints", [0, 0]); $('#slider-constraints').slider("value", 0); } else { $('#slider-constraints').slider("constraints", [0, document.mediaPlayer.currentPosition]); } }, 3000); // Progressbar position window.setInterval(function() { if (document.mediaPlayer.PlayState != 2 && document.mediaPlayer.PlayState == 0) { $('#slider-constraints').slider("constraints", [0, 0]); $('#slider-constraints').slider("value", 0); } else { $('#slider-constraints').slider("value", document.mediaPlayer.currentPosition); } }, 3000); } <div id="slider-constraints" >&nbsp;</div>

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• Separation of multipage tiff with compression "CCITT T.6" very slow

  - by Alex

  I need to separate multiframe tiff files, and use the following method: public static Image[] GetFrames(Image sourceImage) { Guid objGuid = sourceImage.FrameDimensionsList[0]; FrameDimension objDimension = new FrameDimension(objGuid); int frameCount = sourceImage.GetFrameCount(objDimension); Image[] images = new Image[frameCount]; for (int i = 0; i < frameCount; i++) { MemoryStream ms = new MemoryStream(); sourceImage.SelectActiveFrame(objDimension, i); sourceImage.Save(ms, ImageFormat.Tiff); images[i] = Image.FromStream(ms); } return images; } It works fine, but if the source image was encoded using the CCITT T.6 compression, separating a 20-frame-file takes up to 15 seconds on my 2,5ghz CPU.(edit: One core is at 100% during the process) When saving the images afterward to a single file using standard compression (LZW), the separation time of the LZW-file is under 1 second. Saving with CCITT compression also takes very long. Is there a way to speed up the process?

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• Rendering a control generates security exception in .Net 4

  - by Jason Short

  I am having a problem with code that worked fine in .Net 2 giving this error under .Net 4. Build (web): Inheritance security rules violated while overriding member: 'Controls.RelatedPosts.RenderControl(System.Web.UI.HtmlTextWriter)'. Security accessibility of the overriding method must match the security accessibility of the method being overriden. This is in DotNetBlogEngine. There were several other security demands in the code that .Net 4 didn't seem to like. I followed some of the advice I found on blogs (and here) and got rid of all the other errors. But this one still eludes me. The Main blogengine core dll is not set for security demands anylonger and is compiled for .Net 4 as well. This error is in the website side attempting to use the dll. There are controls that call a RenderControl method taking an HtmlTextWriter. Apparently the text writer now has some soft of security attributes set on it. Each of the controls implements a custom interface ( public interface ICustomFilter ), there are no security permissions present or demands. The site is running full trust on my local dev machine.

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• What's the strangest corner case you've seen in C# or .NET?

  - by Jon Skeet

  I collect a few corner cases and brain teasers and would always like to hear more. The page only really covers C# language bits and bobs, but I also find core .NET things interesting too. For example, here's one which isn't on the page, but which I find incredible: string x = new string(new char[0]); string y = new string(new char[0]); Console.WriteLine(object.ReferenceEquals(x, y)); I'd expect that to print False - after all, "new" (with a reference type) always creates a new object, doesn't it? The specs for both C# and the CLI indicate that it should. Well, not in this particular case. It prints True, and has done on every version of the framework I've tested it with. (I haven't tried it on Mono, admittedly...) Just to be clear, this is only an example of the kind of thing I'm looking for - I wasn't particularly looking for discussion/explanation of this oddity. (It's not the same as normal string interning; in particular, string interning doesn't normally happen when a constructor is called.) I was really asking for similar odd behaviour. Any other gems lurking out there?

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• Understanding Javascript's difference between calling a function, and returning the function but executing it later.

  - by Squeegy

  I'm trying to understand the difference between foo.bar() and var fn = foo.bar; fn(); I've put together a little example, but I dont totally understand why the failing ones actually fail. var Dog = function() { this.bark = "Arf"; }; Dog.prototype.woof = function() { $('ul').append('<li>'+ this.bark +'</li>'); }; var dog = new Dog(); // works, obviously dog.woof(); // works (dog.woof)(); // FAILS var fnWoof = dog.woof; fnWoof(); // works setTimeout(function() { dog.woof(); }, 0); // FAILS setTimeout(dog.woof, 0); Which produces: Arf Arf undefined Arf undefined On JSFiddle: http://jsfiddle.net/D6Vdg/1/ So it appears that snapping off a function causes it to remove it's context. Ok. But why then does (dog.woof)(); work? It's all just a bit confusing figuring out whats going on here. There are obviously some core semantics I'm just not getting.

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• geocoder.getFromLocationName returns only null

  - by test

  Hello, I am going out of my mind for the last 2 days with an IllegalArgumentException error i receive in android code when trying to get a coordinates out of an address, or even reverse, get address out of longitude and latitude. this is the code, but i cannot see an error. is a standard code snippet that is easily found on a google search. public GeoPoint determineLatLngFromAddress(Context appContext, String strAddress) { Geocoder geocoder = new Geocoder(appContext, Locale.getDefault()); GeoPoint g = null; try { System.out.println("str addres: " + strAddress); List<Address> addresses = geocoder.getFromLocationName(strAddress, 5); if (addresses.size() > 0) { g = new GeoPoint((int) (addresses.get(0).getLatitude() * 1E6), (int) (addresses.get(0).getLongitude() * 1E6)); } } catch (Exception e) { throw new IllegalArgumentException("locationName == null"); } return g; } These are the permissions from manifest.xml file: <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> I do have the Google Api key declared too: <uses-library android:name="com.google.android.maps" /> From the code snippet above, geo coder is not null, neither is the address or appContext, and i stumble here: geocoder.getFromLocationName(strAddress, 5); I did a lot of google searching and found nothing that worked, and the most important info i found is this: ""The Geocoder class requires a backend service that is not included in the core android framework." Sooo, i am confuzed now. What do I have to call, import, add, use in code.... to make this work? I am using Google Api2.2, Api level 8. If somebody has found a solution for this, or a pointer for documentation, something that i didn't discover, please let us know. Thank you for your time.

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• Did you love the game Mouse Trap as a kid, or something similar? (Programmer Psychology) [closed]

  - by Robert Oschler

  When I was a kid I absolutely fell in love with games that had as a core feature, the need to understand interconnecting structures. My favorite of all time was Mouse Trap. For the younger crowd out there, this was a very cool board game where you built the mouse trap out of the included plastic pieces as you played, with the end goal to trigger the mouse trap. The fully assembled mouse trap was a Rube Goldberg style invention where one operation triggered the next and the next and so on, until the last step dropped a cage on a little plastic mouse. Sometimes when I'm programming and I'm reviewing a particularly complex interaction between components and objects, while tracking the flow path mentally, I say to myself "It's a Mouse Trap!" and I wonder if my early addiction to that game and others like it was portent to my becoming a programmer. Another realization I have sometimes when looking at my code is how daunted I feel at the share complexity involved, followed by a darker comedic amazement at my expectation that it will all come together and work. How about you? Did you find yourself drawn to games that at their heart featured interacting control paths when growing up? Robert.

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• List of rich web application technologies

  - by Michal Czardybon

  I am trying to get myself acquainted with the world of rich web application. There are some comparison tables of available technologies on the Wikipedia, but I still find it unclear what are the options for rich application development. Could you please verify and complete the information I gathered below? What are the key pros and cons of each option? Which is the best choice for big and very rich web application? Option 1: ASP.NET/ASP.NET MVC Vendor: Microsoft Environment: Visual Studio Language: C# Output: HTML+JavaScript+AJAX Example: www.stackoverflow.com Option 2: Silverlight Vendor: Microsoft Environment: Visual Studio Language: C# Output: .NET executable? Example: ? Option 3: Google Web Toolkit Vendor: Google Environment: Eclipse Language: Java Output: HTML+JavaScript+AJAX Example: http://www.projectkaiser.com:8080/pk/ Option 4: Flex Vendor: Adobe Environment: ? Language: ? Output: Flash (.swf file) Example: http://listen.grooveshark.com/ Option 5: Adobe AIR Vendor: Adobe Environment: ? Language: ? Output: AIR Example: http://www.colabolo.com/en/download.html Option 5: Ruby on Rails Vendor: Rails Core Team Envirnoment: ? Language: Ruby Output: HTML+JavaScript+AJAX? Example: ? Option 6: Java Applets Vendor: Sun Environment: Eclipse Language: Java Output: Java Applet Option 7: OpenLeszlo Vendor: ? Environment: ? Language: ? Output: ? Example: ? Option 8: Python? ??? Option 9: XUL ???

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• How to upgrade all dependencies to a specific version

  - by Calm Storm

  Hi, I tried doing a mvn dependency:tree and I get a tree of dependencies. My question is, My project depends on many modules which internally depends on many spring artifacts. There are a few version clashes. I want to upgrade all spring related libraries to say the latest one (2.6.x or above). What is the preferred way to do this? Should I declare all the deps spring-context, spring-support (and 10 other artifacts) in my pom.xml and point them to 2.6.x ? Is there any other better method ? [INFO] +- com.xxxx:yyy-jar:jar:1.0-SNAPSHOT:compile [INFO] | +- com.xxxx:zzz-commons:jar:1.0-SNAPSHOT:compile [INFO] | | +- org.springframework:spring-dao:jar:2.0.7:compile [INFO] | | +- org.springframework:spring-jdbc:jar:2.0.7:compile [INFO] | | +- org.springframework:spring-web:jar:2.0.7:compile [INFO] | | +- org.springframework:spring-support:jar:2.0.7:compile [INFO] | | +- net.sf.ehcache:ehcache:jar:1.2:compile [INFO] | | +- commons-collections:commons-collections:jar:3.2:compile [INFO] | | +- aspectj:aspectjweaver:jar:1.5.3:compile [INFO] | | +- betex-commons:betex-commons:jar:5.5.1-2:compile [INFO] | | \- javax.servlet:servlet-api:jar:2.4:compile [INFO] | +- org.springframework:spring-beans:jar:2.0.7:compile [INFO] | +- org.springframework:spring-jmx:jar:2.0.7:compile [INFO] | +- org.springframework:spring-remoting:jar:2.0.7:compile [INFO] | +- org.apache.cxf:cxf-rt-core:jar:2.0.2-incubator:compile [INFO] | | +- org.apache.cxf:cxf-api:jar:2.0.2-incubator:compile [INFO] | | | +- org.apache.geronimo.specs:geronimo-activation_1.1_spec:jar:1.0-M1:compile [INFO] | | | +- org.codehaus.woodstox:wstx-asl:jar:3.2.1:compile [INFO] | | | +- org.apache.neethi:neethi:jar:2.0.2:compile [INFO] | | | \- org.apache.cxf:cxf-common-schemas:jar:2.0.2-incubator:compile UPDATE : I have removed the extra question about "\-" so my question is now what the subject asks for :)

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• iphone cannot rotate views in TabBar controller

  - by Luc

  Hello, I am working on an application that consists of a TabBar controller. Within on of its tab, I have a subclass of UITableViewController, within this list I have a Core-plot graph in the first cell and some other data in the 4 following cells. When I return YES in the shouldAutorotateToInterfaceOrientation method, I would expect the autoresizing of the list view to happen, but... nothing. When I add some log in the willRotateToInterfaceOrientation method, they are not displayed. Is there something I missed ? Thanks a lot, Luc // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations //return (interfaceOrientation == UIInterfaceOrientationPortrait); NSLog(@"Orientation"); return YES; } - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration]; NSLog(@"Rotating"); if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) { NSLog(@"view land:%@", self.view); } if (toInterfaceOrientation == UIInterfaceOrientationPortrait) { NSLog(@"view portrait:%@", self.view); } }

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• safely hosting a django project over apache using centos

  - by tipu

  Error can be seen at: http://djaffry.selfip.com:8080/ I had a project working great, but I had all the files under /var/www/ and with my limited understanding it's bad, according to django's site: "If your background is in PHP, you’re probably used to putting code under the Web server’s document root (in a place such as /var/www). With Django, you don’t do that. It’s not a good idea to put any of this Python code within your Web server’s document root, because it risks the possibility that people may be able to view your code over the Web. That’s not good for security. Put your code in some directory outside of the document root, such as /home/mycode." So I went to /home/tipu/stuff/ and executed django-admin.py startproject twingle. Then I went to apache and did <VirtualHost *:8080> ServerName tweet_search_engine DocumentRoot /home/tipu/stuff/twingle/ </VirtualHost> <Directory /home/tipu/stuff/twingle> SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE settings PythonOption django.root /home/tipu/stuff/twingle PythonDebug On PythonPath "['/home/tipu/stuff/', '/home/tipu/stuff/twingle/'] + sys.path" </Directory> Now I am getting a 403 Forbidden error.. any idea what I'm doing wrong? I'm newer to Linux (CentOS) and django, so I could be over looking some very simple things.

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• What is the most platform- and Python-version-independent way to make a fast loop for use in Python?

  - by Statto

  I'm writing a scientific application in Python with a very processor-intensive loop at its core. I would like to optimise this as far as possible, at minimum inconvenience to end users, who will probably use it as an uncompiled collection of Python scripts, and will be using Windows, Mac, and (mainly Ubuntu) Linux. It is currently written in Python with a dash of NumPy, and I've included the code below. Is there a solution which would be reasonably fast which would not require compilation? This would seem to be the easiest way to maintain platform-independence. If using something like Pyrex, which does require compilation, is there an easy way to bundle many modules and have Python choose between them depending on detected OS and Python version? Is there an easy way to build the collection of modules without needing access to every system with every version of Python? Does one method lend itself particularly to multi-processor optimisation? (If you're interested, the loop is to calculate the magnetic field at a given point inside a crystal by adding together the contributions of a large number of nearby magnetic ions, treated as tiny bar magnets. Basically, a massive sum of these.) # calculate_dipole # ------------------------- # calculate_dipole works out the dipole field at a given point within the crystal unit cell # --- # INPUT # mu = position at which to calculate the dipole field # r_i = array of atomic positions # mom_i = corresponding array of magnetic moments # --- # OUTPUT # B = the B-field at this point def calculate_dipole(mu, r_i, mom_i): relative = mu - r_i r_unit = unit_vectors(relative) #4pi / mu0 (at the front of the dipole eqn) A = 1e-7 #initalise dipole field B = zeros(3,float) for i in range(len(relative)): #work out the dipole field and add it to the estimate so far B += A*(3*dot(mom_i[i],r_unit[i])*r_unit[i] - mom_i[i]) / sqrt(dot(relative[i],relative[i]))**3 return B

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• android compile error: could not reserve enough space for object heap

  - by moonlightcheese

  I'm getting this error during compilation: Error occurred during initialization of VM Could not create the Java virtual machine. Could not reserve enough space for object heap What's worse, the error occurs intermittently. Sometimes it happens, sometimes it doesn't. It seems to be dependent on the amount of code in the application. If I get rid of some variables or drop some imported libraries, it will compile. Then when I add more to it, I get the error again. I've included the following sources into the application in the [project_root]/src/ directory: org.apache.httpclient (I've stripped all references to log4j from the sources, so don't need it) org.apache.codec (as a dependency) org.apache.httpcore (dependency of httpclient) and my own activity code consisting of nothing more than an instance of HttpClient. I know this has something to do with the amount of memory necessary during compile time or some compiler options, and I'm not really stressing my system while i'm coding. I've got 2GB of memory on this Core Duo laptop and windows reports only 860MB page file usage (haven't used any other memory tools. I should have plenty of memory and processing power for this... and I'm only compiling some common http libs... total of 406 source files. What gives? edit (4/30/2010-18:24): Just compiled some code where I got the above stated error. I closed some web browser windows and recompiled the same exact code with no edits and it compiled with no issue. this is definitely a compiler issue related to memory usage. Any help would be great.... because I have no idea where to go from here. Android API Level: 5 Android SDK rel 5 JDK version: 1.6.0_12 Sorry I had to repost this question because regardless of whether I use the native HttpClient class in the Android SDK or my custom version downloaded from apache, the error still occurs.

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