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• Grails - Development advice - Where do I find Plugin APIs / Troubleshoot errors / Make life easy for

  - by gav

  Hello fellow Grails Developers! I was wondering if you could help me with what must be a very common issue. I have come from a world of Java and eclipse where JavaDocs and APIs are at your fingertips. Grails has some great features and plugins but I find their inner workings completely undescoverable and that makes me sad. Take for example the excellent authentication plugin, I set this up using the brief but accurate doc. Now I'm in eclipse with STS and I'm staring at a method; applicationContext.authenticationService.filterRequest( request, response, "${request.contextPath}/authentication/index" ) Which is throwing an exception; 2010-05-01 01:17:07,292 [http-8080-1] ERROR [/grailsapp].[default] - Servlet.service() for servlet default threw exception java.lang.IllegalStateException at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407) at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:118) at org.codehaus.groovy.grails.web.sitemesh.GrailsPageResponseWrapper.sendError(GrailsPageResponseWrapper.java:91) And I have no idea where to start. I would love to have eclipse link to the source but there must be other manageable alternatives too as I know some people use TextMate or vim for development, they can't all have discovered the APIs for the plugins through trial and error!?! Is there any way of making the core Grails API more accessible / searchable? Autocomplete also doesn't seem to work for me in eclipse so if anyone has this working that would be ideal (It's an extension of the same question really). What's your approach? (Please don't say intelliJ, I can't afford it) I'm sure it's obvious and I'm just missing it, please put me out of my misery! Thanks in advance, Gav

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• Leopard => Snow Leopard architecture woes with nokogiri / rails

  - by Julian

  I'm confused. It's a regular state of affairs for me but specifically in this case I felt I could reach out to fellow stackoverflowers (that is, stackoverflow-ers, not stackover-flowers). uname -a Darwin macbookpro 10.3.0 Darwin Kernel Version 10.3.0: Fri Feb 26 11:58:09 PST 2010; root:xnu-1504.3.12~1/RELEASE_I386 i386 set bash-3.2$ set ... HOSTTYPE=x86_64 ... MACHTYPE=x86_64-apple-darwin10.0 ... I'm having a nightmare rebuilding some native ruby gems and I'm wondering whether this is part of the problem -- part of this machine says its 64 bit but another part 32 ... as far as I can tell? Under 'About this Mac' it says 'Intel Core 2 Duo' which Apple says is 64 bit. So why, after doing sudo gem pristine --all am I still getting this kind of error? dlopen(/Applications/Rails/ruby/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle, 9): no suitable image found. Did find: /Applications/Rails/ruby/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle: mach-o, but wrong architecture - /Applications/Rails/ruby/lib/ruby/gems/1.8/gems/nokogiri-1.4.2/lib/nokogiri/nokogiri.bundle Specifically I had removed nokogiri and reinstalled it. No errors in output. bash-3.2$ sudo gem install nokogiri Building native extensions. This could take a while... Successfully installed nokogiri-1.4.2 1 gem installed thanks for any thoughts!

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• Use XMPP instead of HTTP

  - by pavel

  Hey guys. My friend and I, we are working on iPhone application. This application uses XMPP protocol to provide chat functionality. Right now we are designing architecture for the application. So my friend is working on iPhone side, and I am ruby on rails guy. My friend suggested, that we wrap every call, that is usually served via HTTP into XMPP. So, user registration, users search, profile editing, photo uploading, everything goes via XMPP. No HTTP at all. My friend wants to use XMPP, because he says, that it's much easier to implement XMPP on client-side rather HTTP. As for me, this is bullshit, but we've got a product owner, who have been working with my friend for a long time and he trusts him. So what I'm trying to do is to convince my friend and product owner that using XMPP for what HTTP can work find — is totally not the best idea. I feel, that if we implement everything on XMPP, we will have a pain in an ass till the end of lives. But how do I prove it? P.S. I'm not against chat over XMPP, I am against users search, photo uploading, rankings, nearby search and various other restful requests. Please, leave response. Any help appreciated. A little update: Yesterday we had a long discussion. And it turns out, it's quiete hard to receive response from both XMPP and HTTP in Objective-C. Because every single object and its data should be stored in Core Data model, while this model can't be securely modified from various places. Say, if you use HTTP transport, you always want to use only HTTP transport to update data in your model. And if you use XMPP, you should always use XMPP. So, you can't use both. That's what my iPhone buddy told me. It sounds weird for me, can anyone explain me that?

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• How to solve "catastrophic failure" with 32-bit COM component in SysWOW64\cscript or wscript

  - by kcrumley

  I'm trying to run a VBScript script that uses a 7-year-old 3rd-party 32-bit COM component on Windows Server 2008 R2, with the command-line 32-bit script host, SysWOW64\cscript.exe. When I call CreateObject on the class, it appears to be successful, but the very first time I try to use a property or method (I've tried several different ones) on the object, it gives me the "catastrophic failure". I have identical results with SysWOW64\wscript.exe, except, of course, that my error message comes in a msgbox instead of the command-line window. I think this has to do specifically with the 64-bit scripting hosts because of the following: The equivalent Classic ASP script, calling the same component and using 95% of the same code, works correctly on the same server, with IIS configured to support 32-bit COM. The same VBScript works correctly on a 32-bit Windows XP machine and a 32-bit Windows Server 2003 machine. The component fails in exactly the same way on my 64-bit Windows 7 machine. My Google searches for solutions to this problem have mostly turned up a lot of different problems that were solved by putting the COM component into a toolbar in Visual Studio. Obviously, that solution doesn't apply here. My questions are: Is there a core problem that is always behind a "catastrophic failure" from a Windows scripting host calling a COM component? Is there a place in a configuration snap-in, or in the registry, where I need to make a change similar to the change I had to make to the IIS Application pool to "Enable 32-bit Applications"? Is there a general place in the Server 2008 R2 Event Viewer that I should be looking, to see if there are any more details on the failure, in case it turns out to be specific to this component? Thanks in advance.

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• Passing in defaults within window.onload?

  - by Matrym

  I now understand that the following code will not work because I'm assigning window.onload to the result of the function, not the function itself. But if I remove the parens, I suspect that I have to explicitly call a separate function to process the config before the onload. So, where I now have: <!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> <script type="text/javascript" src="lb-core.js"></script> <script type="application/javascript"> var lbp = { defaults: { color: "blue" }, init: function(config) { if(config) { for(prop in config){ setBgcolor.defaults[prop] = config[prop]; } } var bod = document.body; bod.style.backgroundColor = setBgcolor.defaults.color; } } var config = { color: "green" } window.onload = lbp.init(config); </script> </HEAD> <body> <div id="container">test</div> </body> </HTML> I imagine I would have to change it to: var lbp = { defaults: { color: "blue" }, configs: function(config){ for(prop in config){ setBgcolor.defaults[prop] = config[prop]; } }, init: function() { var bod = document.body; bod.style.backgroundColor = setBgcolor.defaults.color; } } var config = { color: "green" } lbp.configs(config); window.onload = lbp.init; Then, for people to use this script and pass in a configuration, they would need to call both of those bottom lines separately (configs and init). Is there a better way of doing this? Note: If your answer is to bundle a function of window.onload, please also confirm that it is not hazardous to assign window.onload within scripts. It's my understanding that another script coming after my own could, in fact, overwrite what I'd assigned to onload.

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• Installed VS Express 2010 with .NET 4.0 and now .NET 3.5 setup project adds 15 dependencies

  - by Heckflosse_230

  Hi, I installed VS Express 2010 with .NET 4.0 and now a .NET 3.5 setup project in VS 2008 adds 15 dependencies (below), what is going on??? I did not change anything in the project in between installing VS 2010, VS 2008 is packagin the following files in the project: ==================== Packaging file 'Microsoft.Transactions.Bridge.dll'... Packaging file 'System.Core.dll'... Packaging file 'System.Data.DataSetExtensions.dll'... Packaging file 'System.Data.Entity.dll'... Packaging file 'System.Data.Linq.dll'... Packaging file 'System.Data.Services.Client.dll'... Packaging file 'System.Data.Services.Design.dll'... Packaging file 'System.IdentityModel.Selectors.dll'... Packaging file 'System.IdentityModel.dll'... Packaging file 'System.Runtime.Serialization.dll'... Packaging file 'System.ServiceModel.Web.dll'... Packaging file 'System.ServiceModel.dll'... Packaging file 'System.Web.Abstractions.dll'... Packaging file 'System.Web.Extensions.dll'... Packaging file 'System.Xml.Linq.dll'... ==================== I've uninstalled VS 2010 and .NET 4.0 but to no avail, same problem. Lesson learned: DON'T EXPERIMENT ON DEVELOPMENT MACHINE! Thanks, Chris

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• What's this error messages mean?

  - by flybirdtt

  03-20 11:41:28.103: ERROR/vold(550): Error opening switch name path '/sys/class/switch/test2' (No such file or directory) 03-20 11:41:28.103: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test2' (m) 03-20 11:41:28.103: ERROR/vold(550): Error opening switch name path '/sys/class/switch/test' (No such file or directory) 03-20 11:41:28.103: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test' (m) 03-20 11:41:28.153: ERROR/flash_image(557): can't find recovery partition 03-20 11:41:51.493: ERROR/MemoryHeapBase(585): error opening /dev/pmem: No such file or directory 03-20 11:41:51.503: ERROR/SurfaceFlinger(585): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake 03-20 11:41:51.572: ERROR/GLLogger(585): couldn't load library (Cannot find library) 03-20 11:41:52.144: ERROR/GLLogger(585): couldn't load library (Cannot find library) 03-20 11:41:59.913: ERROR/BatteryService(585): Could not open '/sys/class/power_supply/usb/online' 03-20 11:41:59.923: ERROR/BatteryService(585): Could not open '/sys/class/power_supply/battery/batt_vol' 03-20 11:41:59.943: ERROR/BatteryService(585): Could not open '/sys/class/power_supply/battery/batt_temp' 03-20 11:42:00.532: ERROR/EventHub(585): could not get driver version for /dev/input/mouse0, Not a typewriter 03-20 11:42:00.563: ERROR/EventHub(585): could not get driver version for /dev/input/mice, Not a typewriter 03-20 11:42:00.793: ERROR/System(585): Failure starting core service 03-20 11:42:00.793: ERROR/System(585): java.lang.SecurityException 03-20 11:42:00.793: ERROR/System(585): at android.os.BinderProxy.transact(Native Method) 03-20 11:42:00.793: ERROR/System(585): at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146) 03-20 11:42:00.793: ERROR/System(585): at android.os.ServiceManager.addService(ServiceManager.java:72) 03-20 11:42:00.793: ERROR/System(585): at com.android.server.ServerThread.run(SystemServer.java:163) 03-20 11:42:00.823: ERROR/AndroidRuntime(585): Crash logging skipped, no checkin service 03-20 11:42:02.993: ERROR/LockPatternKeyguardView(585): Failed to bind to GLS while checking for account 03-20 11:42:10.204: ERROR/ApplicationContext(585): Couldn't create directory for SharedPreferences file shared_prefs/wallpaper-hints.xml 03-20 11:42:11.539: ERROR/ActivityThread(624): Failed to find provider info for android.server.checkin 03-20 11:42:12.889: ERROR/ActivityThread(624): Failed to find provider info for android.server.checkin 03-20 11:42:13.048: ERROR/ActivityThread(624): Failed to find provider info for android.server.checkin

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• UITouch Event Propagation To Background UIViews

  - by drewww

  I'm having troubles getting any UIView that's not the foreground UIView to receive UITouch events. I'm building an all-Core Graphics-app, so I'm not using any built in UIViews or IB or anything - everything is programmatically constructed and drawn into. Here's my view hierarchy: Root View Type A Container Type A View Type A View Type A View Type B Container Type B View Type B View Type B View The containers are just vanilla UIView objects that I create programmatically and add instances of Type A and B to when they're created. I did this originally to make hitTesting easier—Type A objects can be drag-and-dropped onto Type B objects. Type A objects receive touch events fine, but Type B objects (which are contained by Type B Container which is behind Type A Container) don't receive touch events. Both containers occupy the entire screen; they're basically just convenience containers. If I pull Type B Container to the front (eg [self.view bringSubviewToFront:Type B Container]) it receives events properly, but then the Type A Container doesn't get events. How do I propagate events from the view that's on top? Both views occupy the entire screen, so it makes sense that the top-most view is catching the events, but how should I get it to pass those events on to Type B Container? I could inject some code in the container that passes the touch events back to the main ViewController which can pass them on to Type B Container but that feels really messy to me. Is there a nicer way to not have the Type A Container stop propagation? What's the best practice here?

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• Db4o Mvc Application Architecture

  - by Mac

  I am currently testing out Db4o for an asp.net MVC 2 application idea but there are a few things I'm not quite sure on the best way to proceed. I want my application to use guessable routes rather than Id's for referencing my entities but I also think I need Id's of some sort for update scenarios. so for example I want /country/usa instead of /country/1 I may want to change the key name though (not perhaps on a country but on other entities) so am thinking I need an Id to use as the reference to retrieve the object prior to updating it's fields. From other comments it seems like the UUID is a bit long to be using and would prefer to use my own id's anyway for clean separation of concerns. Looking at both the KandaAlpha project I wasn't too keen on some aspects of the design and prefer something more along the lines of S#arp architecture where they use things like the [domainsignature] and EntityWithTypedId, IEntityDuplicateChecker, IHasAssignedId, BaseObject and IValidatable in their entities to control insert/update behaviour which seems cleaner and more extensible, covers validation and is encapsulated well within the core and base repository classes. So would a port of S#arp architecture to Db4o make sense of am I still thinking rmdbs in an oodb world? Also is there a best practice for managing indexes (including Unique ones as above) in Db4o? Should they be model metadata based and loaded using DI in a bootstrapper for example or should they be more loaded more like Automapper.CreateMap? Its a bit of a rambling question I know but any thoughts, ideas or suggested reading material is greatly appreciated. Thanks Mac

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• GTK#-related error on MonoDevelop 2.8.5 on Ubuntu 11.04

  - by Mehrdad

  When I try to create a new solution in MonoDevelop 2.8.5 in Ubuntu 11.04 x64, it shows me: System.ArgumentNullException: Argument cannot be null. Parameter name: path1 at System.IO.Path.Combine (System.String path1, System.String path2) [0x00000] in <filename unknown>:0 at MonoDevelop.Core.FilePath.Combine (System.String[] paths) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.ProjectCreateInformation.get_BinPath () [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetAssemblyProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.ProjectService.CreateProject (System.String type, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Templates.ProjectDescriptor.CreateItem (MonoDevelop.Projects.ProjectCreateInformation projectCreateInformation, System.String defaultLanguage) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Templates.ProjectTemplate.HasItemFeatures (MonoDevelop.Projects.SolutionFolder parentFolder, MonoDevelop.Projects.ProjectCreateInformation cinfo) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Projects.NewProjectDialog.SelectedIndexChange (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 I strace'd it and saw repeated failed accesses to files like: /usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/libgtk-x11-2.0.so.0.la so I'm assuming that's the cause of the problem. However, I've installed (and re-installed) anything GTK#-related that I could think of... and the error still occurs. Does anyone know how to fix it?

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• How to arrange models, views, controllers in a new Kohana 3 project

  - by Pekka

  I'm looking at how to set up a mid-sized web application with Kohana 3. I have implemented MVC patterns in the past but never worked against a "formalized" MVC framework so I'm still getting my head around the terminology - toying around with basic examples, building views and templates, and so on. I'm progressing fairly well but I want to set up a real-world web project (one of my own that I've been planning for quite some time now) as a learning object. Example-based documentation is a bit sparse for Kohana 3 right now - they say so themselves on the site. While I'm not worried about learning the framework soon enough, I'm a bit at a loss on how to arrange a healthy code base from the start - i.e. how to split up controllers, how to name them, and how to separate the functionality into the appropriate models. My application could, in its core, be described as a business directory with a main businesses table. Businesses can be listed by category and by street name. Each business has a detail page. Business owners can log in and edit their business's entry. Businesses can post offers into an offers table. I know this is pretty vague, I'll be more than happy to go into more detail on request. Supposing I have all the basic functionality worked out and in place already - list all businesses, edit business, list businesses by street name, create offer, and so on, and I'm just looking for how to fit the functionality into a Kohana application structure that can be easily extended: Do you know real-life, publicly accessible examples of applications built on Kohana 3 where I could take a peek how they do it? Are there conventions or best practices on how to structure an extendable login area for end users in a Kohana project that is not only able to handle a business directory page, but further products on separate pages as well? Do you know application structuring HOWTOs or best practices for Kohana 3 not mentioned in the user guide and the inofficial Wiki? Have you built something similar and could give me some recommendations?

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• Android Studio Could not call IncrementalTask.taskAction() on task ':project:dexDebug'

  - by akenawell85x

  I recently decided to switch from Eclipse to Android Studio. I imported a project I was working on and am now getting this error when I try to run the project. Gradle: Execution failed for task ':project:dexDebug'. > Could not call IncrementalTask.taskAction() on task ':project:dexDebug' I've been cruising this site for 2 days now and trying different suggestions to no avail. I did run gradlew compileDebug --stacktrace and this is what I got: C:\Users\adam\AndroidStudioProjects\projectProject>gradlew compileDebug --stacktrace Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0 :project:preBuild UP-TO-DATE :project:preDebugBuild UP-TO-DATE :project:preReleaseBuild UP-TO-DATE :project:prepareComAndroidSupportAppcompatV71800Library UP-TO-DATE :project:prepareComGoogleAndroidGmsPlayServices3225Library UP-TO-DATE :project:prepareDebugDependencies :project:compileDebugAidl UP-TO-DATE :project:compileDebugRenderscript UP-TO-DATE :project:generateDebugBuildConfig UP-TO-DATE :project:mergeDebugAssets UP-TO-DATE :project:mergeDebugResources UP-TO-DATE :project:processDebugManifest UP-TO-DATE :project:processDebugResources UP-TO-DATE :project:generateDebugSources UP-TO-DATE :project:compileDebug UP-TO-DATE BUILD SUCCESSFUL Total time: 10.459 secs However I am still getting that error when I try to actually run the project. Here is my build.gradle (i do have a 'libs' folder in my project with all the jars for a google maps/places app): buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.6.+' } } apply plugin: 'android' repositories { mavenCentral() } android { compileSdkVersion 18 buildToolsVersion "18.1.1" defaultConfig { minSdkVersion 8 targetSdkVersion 18 } } dependencies { compile fileTree(dir: 'libs') compile 'com.google.android.gms:play-services:3.2.25' compile 'com.android.support:support-v4:18.0.0' compile 'com.android.support:appcompat-v7:+' } and my settings.gradle: include ':project', ':project:libs:android-support-v4', ':project:libs:google-api-client-1.10.3-beta', ':project:libs:google-api-client-android2-1.10.3-beta', ':project:libs:google-http-client-1.10.3-beta', ':project:libs:google-http-client-android2-1.10.3-beta', ':project:libs:google-oauth-client-1.10.1-beta', ':project:libs:gson-2.1', ':project:libs:guava-11.0.1', ':project:libs:jackson-core-asl-1.9.4', ':project:libs:jsr305-1.3.9', ':project:libs:protobuf-java-2.2.0', ':project:libs:GoogleAdMobAdsSdk-6.4.1' As I said, I've tried pretty much everything I have read on here about this error and am having no luck. Any help would be greatly appreciated.

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• Django attribute error: 'module' object has no attribute 'is_usable'

  - by Robert A Henru

  Hi, I got the following error when calling the url in Django. It's working before, I guess it's related with some accidental changes I made, but I have no idea what they are. Thanks before for the help, Robert Environment: Request Method: GET Request URL: http://localhost:8000/time/ Django Version: 1.2 Python Version: 2.6.1 Installed Applications: ['django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.admin', 'djlearn.books'] Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware') Traceback: File "/Library/Python/2.6/site-packages/django/core/handlers/base.py" in get_response 100. response = callback(request, *callback_args, **callback_kwargs) File "/Users/rhenru/Workspace/django/djlearn/src/djlearn/../djlearn/views.py" in current_datetime 16. return render_to_response('current_datetime.html',{'current_date':now,}) File "/Library/Python/2.6/site-packages/django/shortcuts/__init__.py" in render_to_response 20. return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) File "/Library/Python/2.6/site-packages/django/template/loader.py" in render_to_string 181. t = get_template(template_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in get_template 157. template, origin = find_template(template_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in find_template 128. loader = find_template_loader(loader_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in find_template_loader 111. if not func.is_usable: Exception Type: AttributeError at /time/ Exception Value: 'module' object has no attribute 'is_usable'

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• How do you keep your business rules DRY?

  - by Mario

  I periodically ponder how to best design an application whose every business rule exists in just a single location. (While I know there is no proverbial “best way” and that designs are situational, people must have a leaning toward one practice or another.) I work for a shop where they prefer to house as much of the business rules as possible in the database. This requires developers in many cases to perform identical front-end validations to avoid sending data to the database that will result in an exception—not very DRY. It grates me anytime I find myself duplicating any kind of logic—even lowly validation logic. I am a single-point-of-truth purist to an anal degree. On the other end of the spectrum, I know of shops that create dumb databases (the Rails community leans in this direction) and handle all of the business logic in a separate tier (in Rails the models would house “most” of this). Note the word “most” which implies that some business logic does end up spilling into other places (in Rails it might spill over into the controllers). In way, a clean separation of concerns where all business logic exists in a single core location is a Utopian fantasy that’s hard to uphold (n-tiered architecture or not). Furthermore, is see the “Database as a fortress” and would agree that it should be built on constraints that cause it to reject bad data. As such, I hold principles that cause a degree of angst as I attempt to balance them. How do you balance the database-as-a-fortress view with the desire to have a single-point-of-truth?

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• Android ndk-build command does nothing

  - by James

  I have a similar question to that posted here: Android NDK: why ndk-build doesn't generate .so file and a new libs folder in Eclipse? ...though I am running Windows 7, not Mac os. Essentially the ndk-build command is run, gives no error but doesn't create an .so file (also, since I'm on windows this should create a .dll and not an .so?). I tried running the command from the root, jni, src folders etc. but got the same result; cmd just returns to the prompter after a few seconds. I ran it again from the jni folder with NDK_LOG=1 parameter to see what was happening. Here is a portion of the transcript of the log results after running ndk-build in the jni folder (after it successfully identified the platform, etc.)... Android NDK: Looking for jni/Android.mk in /workspace/NdkFooActivity/jni Android NDK: Looking for jni/Android.mk in /workspace/NdkFooActivity Android NDK: Found it ! Android NDK: Found project path: /workspace/NdkFooActivity Android NDK: Ouput path: /workspace/NdkFooActivity/obj Android NDK: Parsing /cygdrive/c/android-ndk-r8/build/core/default-application.mk Android NDK: Found APP_PLATFORM=android-15 in /workspace/NdkFooActivity/project.properties Android NDK: Application local targets unknown platform 'android-15' Android NDK: Switching to android-14 Android NDK: Using build script /workspace/NdkFooActivity/jni/Android.mk Android NDK: Application 'local' is not debuggable Android NDK: Selecting release optimization mode (app is not debuggable) Android NDK: Adding import directory: /cygdrive/c/android-ndk-r8/sources Android NDK: Building application 'local' for ABI 'armeabi' Android NDK: Using target toolchain 'arm-linux-androideabi-4.4.3' for 'armeabi' ABI Android NDK: Looking for imported module with tag 'cxx-stl/system' Android NDK: Probing /cygdrive/c/android-ndk-r8/sources/cxx-stl/system/Android.mk Android NDK: Found in /cygdrive/c/android-ndk-r8/sources/cxx-stl/system Android NDK: Cygwin dependency file conversion script: ...after which point it just runs the script mentioned in the last line, then terminates. Any ideas? Thanks!

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• What are best practices for collecting, maintaining and ensuring accuracy of a huge data set?

  - by Kyle West

  I am posing this question looking for practical advice on how to design a system. Sites like amazon.com and pandora have and maintain huge data sets to run their core business. For example, amazon (and every other major e-commerce site) has millions of products for sale, images of those products, pricing, specifications, etc. etc. etc. Ignoring the data coming in from 3rd party sellers and the user generated content all that "stuff" had to come from somewhere and is maintained by someone. It's also incredibly detailed and accurate. How? How do they do it? Is there just an army of data-entry clerks or have they devised systems to handle the grunt work? My company is in a similar situation. We maintain a huge (10-of-millions of records) catalog of automotive parts and the cars they fit. We've been at it for a while now and have come up with a number of programs and processes to keep our catalog growing and accurate; however, it seems like to grow the catalog to x items we need to grow the team to y. I need to figure some ways to increase the efficiency of the data team and hopefully I can learn from the work of others. Any suggestions are appreciated, more though would be links to content I could spend some serious time reading. THANKS! Kyle

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• ASP.NET MVC 2 with NServiceBus unable to load requested types

  - by dp

  I am trying to use NServiceBus with an ASP.NET MVC 2 website (using VS 2010 and the .NET 4.0 framework). However, when I run the site on my local machine, I get the following error: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. Here are the relevant steps I have taken: Downloaded the NServiceBus.2.0.0.1145 binaries In my asp.net mvc app, I've added references to NServiceBus.dll and NServiceBus.Core.dll In Global.asax.cs I've added: public static IBus Bus { get; private set; } protected void Application_Start() { AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); Bus = NServiceBus.Configure .WithWeb() .Log4Net() .DefaultBuilder() .XmlSerializer() .MsmqTransport() .IsTransactional(false) .PurgeOnStartup(false) .UnicastBus() .ImpersonateSender(false) .CreateBus() .Start(); } In web.config, I've added: <MsmqTransportConfig InputQueue="MyWebClient" ErrorQueue="error" NumberOfWorkerThreads="1" MaxRetries="5"/> <UnicastBusConfig> <MessageEndpointMappings> <add Messages="Messages" Endpoint="MyServerInputQueue"/> </MessageEndpointMappings> </UnicastBusConfig> The error indicates that the problem is with the first line in the Global.asax.cs file. Is it possible that there is a problem with NServiceBus running under .NET 4.0?

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• Eclipse RCP: Using different JUnit version (4.3.1) than shipped with eclipse galileo (4.5.0)

  - by Skrrytch

  Hallo, I have the following situation: We are developing an Eclipse RCP Application and want to switch from Eclipse 3.4 to Eclipse 3.5. Our JUnit-Tests are using JUnit 4.3.1 and we have a launch configuration to start our test suite. I think I don't need to go into more details here. The problem is: Running the tests with Eclipse 3.5 does not work: JUnit cannot find any annotations in the test classes (neither (at)Test nor (at)RunWith). I patched the junit library with some logging output to check what is going on. I found out that this problem is a classloading issue: The test class passed to JUnit 'lies in' a ClassLoader which is different from the one JUnit uses to load the annotation classes like 'RunWith'. This is not the case in Eclipse 3.4 in org.junit.internal.requests.ClassRequest: public Runner getRunner() { log("TestClass ClassLoader: "+this.fTestClass.getClassLoader()); log("RunWith.class ClassLoader: "+RunWith.class.getClassLoader()); ... // validating test class: searching for annotations and more } The first line prints another classloader than the second line. This is bad because JUnit cannot match the annotations in the test class with the Annotation-Class (here: RunWith.class): "RunWith" in CL1 is not equal to "RunWith" in CL2. I have a solution which points to the core problem: Replace JUnit 4.5 in Eclipse Galileo with JUnit 4.3.1 so that there is only one JUnit-Version: The Test-Run and the tests classes are both using JUnit 4.3.1 (I had to patch "org.eclipse.jdt.junit4.runtime" to accept an ealier junit version). I think I can also replace JUnit 4.3.1 in my test class with Version 4.5, but that is not an option yet. Guess: The classloaders are different because the classes 'come from' different JUnit-Bundles: the testclass with its annotations from version 4.3.1 and the test runs in version 4.5 What I want to know: Is there any other solution besides patching Eclipse (replace JUnit versions)? Any commandline argument or such? Any configuration to force Eclipse to Use JUnit 4.3.1? Any hints on the above described analysis are welcome!

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• GMap.NET shows no map

  - by Mariusz

  I'm trying to use the GMap.NET.WindowsForms control in my Windows forms application but I cannot make it show me any map. Here is what I did: I added the control to my Visual Studio's 2010 toolbox by clicking 'Choose Items...' from the toolbox's context menu and browsing for the GMap.NET.WindowsForms.dll included in the downloaded zip archive. I also added references to GMap.NET.Core.dll and System.Data.SQLite.dll in my solution. Then I put the GMapControl that appeared in the toolbox on the main form of my application and set the map type to GoogleMap. When I run my application, however, the control shows either a blue screen with a piece of text saying "We are sorry, but we don't have imagery at this zoom level for this region" or a bright screen with completely no data (when I change zoom level). Here is my code: GMapMain.MapType = MapType.GoogleMap; GMapMain.MaxZoom = 100; GMapMain.MinZoom = 0; GMapMain.Zoom = 50; GMapMain.CurrentPosition = new PointLatLng(54.6961334816182, 25.2985095977783); GMapMain.ReloadMap(); Please help. I have no idea what to do and I cannot find any information in the Internet that could help me solve the problem. Thank you very much in advance.

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• Cannot turn off autocommit in a script using the Django ORM

  - by Wes

  I have a command line script that uses the Django ORM and MySQL backend. I want to turn off autocommit and commit manually. For the life of me, I cannot get this to work. Here is a pared down version of the script. A row is inserted into testtable every time I run this and I get this warning from MySQL: "Some non-transactional changed tables couldn't be rolled back". #!/usr/bin/python import os import sys django_dir = os.path.abspath(os.path.normpath(os.path.join(os.path.dirname(__file__), '..'))) sys.path.append(django_dir) os.environ['DJANGO_DIR'] = django_dir os.environ['DJANGO_SETTINGS_MODULE'] = 'myproject.settings' from django.core.management import setup_environ from myproject import settings setup_environ(settings) from django.db import transaction, connection cursor = connection.cursor() cursor.execute('SET autocommit = 0') cursor.execute('insert into testtable values (\'X\')') cursor.execute('rollback') I also tried placing the insert in a function and adding Django's commit_manually wrapper, like so: @transaction.commit_manually def myfunction(): cursor = connection.cursor() cursor.execute('SET autocommit = 0') cursor.execute('insert into westest values (\'X\')') cursor.execute('rollback') myfunction() I also tried setting DISABLE_TRANSACTION_MANAGEMENT = True in settings.py, with no further luck. I feel like I am missing something obvious. Any help you can give me is greatly appreciated. Thanks!

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• Java NoClassDefFoundError when calling own class from instrumented method

  - by lethal_possum

  Hello, I am working on a kit of simple Java agents to help me (and hopefully others) troubleshoot Java applications. One of the agents I would like to create instruments the JComponent.getToolTipText() method to quickly identify any GUI class by just hovering the mouse cursor over it. You can find the code of my transformer and the rest of the project here: http://sfn.cvs.sourceforge.net/viewvc/sfn/core/src/main/java/org/leplus/sfn/transformer/JComponentTransformer.java?view=markup I launch my test GUI with the agent attached as follow: $ java -javaagent:target/jars/sfn-0.1-agent.jar=JComponent -cp lib/jars/bcel-5.2.jar:target/jars/sfn-0.1-test.jar:target/jars/sfn-0.1-agent.jar org.leplus.sfn.test.Main sfn-0.1-agent.jar contains the org.leplus.sfn.transformer.JComponentTransformer class. sfn-0.1-test.jar contains the org.leplus.sfn.test.Main class. Here is what the application prints when I launch it and I put the mouse over it: Loading agent: JComponent Instrumentation ready! Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/leplus/sfn/tracer/ComponentTracer at javax.swing.JComponent.getToolTipText(JComponent.java) at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:662) ... What is surprising to me is that if I change my transformer to call any class from the JRE, it works. But it doesn't work when I call my own class org.leplus.sfn.tracer.ComponentTracer. My first guess was a classpath issue but the ComponentTracer is both in the classpath and in the agent's jar. So I am lost. If any of you see where I am missing something. Cheers, Tom

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• UI design in flash games

  - by anon

  This question is more UI/Design-ish than hard-core programming is. Background: I've been coding in VIM/C++/OpenGL for a long time. I've come to realize that this (VIM/C++/OpenGL) isn't the way to learn about programming fancy/cool-looking/futuristic UIs; and that the design of such UIs belongs more so in the artistic/designer world of Flash. Anyway, I currently have a machine with MacOSX. What software should I install? What book should I read to learn about the artistic/design side of these futuristic UIs? [It's okay if the tools to design them are mouse clicking + graphical rather than coding based]. Question: what software packages + books to read to learn about creating fancy-looking / futuristic UIs in flash? Thanks! EDIT: PS these questions seem to get closed frequently. If you're going to vote to close for "duplicate question"; atleast provide a link to the question (with an answer).

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• java.sql.Exception ClosedConnection

  - by john

  I am getting the following error: java.sql.SQLException: Closed Connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208) at oracle.jdbc.driver.PhysicalConnection.getMetaData(PhysicalConnection.java:1508) at com.ibatis.sqlmap.engine.execution.SqlExecutor.moveToNextResultsSafely(SqlExecutor.java:348) at com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:320) at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQueryProcedure(SqlExecutor.java:277) at com.ibatis.sqlmap.engine.mapping.statement.ProcedureStatement.sqlExecuteQuery(ProcedureStatement.java:34) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:614) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:588) at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118) at org.springframework.orm.ibatis.SqlMapClientTemplate$3.doInSqlMapClient(SqlMapClientTemplate.java:268) at org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:193) at org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult(SqlMapClientTemplate.java:219) at org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:266) at gov.hud.pih.eiv.web.authentication.AuthenticationUserDAO.isPihUserDAO(AuthenticationUserDAO.java:24) at gov.hud.pih.eiv.web.authorization.AuthorizationProxy.isAuthorized(AuthorizationProxy.java:125) at gov.hud.pih.eiv.web.authorization.AuthorizationFilter.doFilter(AuthorizationFilter.java:224) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at I am really stumped and can't figure out what could be causing this error. I am not able to reproduce the error on my machine but on production it is coming a lot of times. I am using iBatis in the whole application so there are no chances of my code not closing connections. We do have stored procedures that run for a long time before they return results (around 15 seconds). does anyone have any ideas on what could be causing this? I dont think raising the # of connections on the application server will fix this issue buecause if connections were running out then we'd see "Error on allocating connections"

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• When is LINQ (to objects) Overused?

  - by Mystagogue

  My career started as a hard-core functional-paradigm developer (LISP), and now I'm a hard-care .net/C# developer. Of course I'm enamored with LINQ. However, I also believe in (1) using the right tool for the job and (2) preserving the KISS principle: of the 60+ engineers I work with, perhaps only 20% have hours of LINQ / functional paradigm experience, and 5% have 6 to 12 months of such experience. In short, I feel compelled to stay away from LINQ unless I'm hampered in achieving a goal without it (wherein replacing 3 lines of O-O code with one line of LINQ is not a "goal"). But now one of the engineers, having 12 months LINQ / functional-paradigm experience, is using LINQ to objects, or at least lambda expressions anyway, in every conceivable location in production code. My various appeals to the KISS principle have not yielded any results. Therefore... What published studies can I next appeal to? What "coding standard" guideline have others concocted with some success? Are there published LINQ performance issues I could point out? In short, I'm trying to achieve my first goal - KISS - by indirect persuasion. Of course this problem could be extended to countless other areas (such as overuse of extension methods). Perhaps there is an "uber" guide, highly regarded (e.g. published studies, etc), that takes a broader swing at this. Anything?

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• Install CLSQL on Mac OS X

  - by Ken

  I have SBCL installed (via macports/darwinports) on my Intel Core 2 Duo Macbook running 10.5.8. I've installed several libraries like this: (require 'asdf) (require 'asdf-install) (asdf-install:install 'cl-who) But when I tried to install CLSQL this way ('clsql) after it downloaded, I got this: ... ; registering #<SYSTEM CLSQL-UFFI {123D9E01}> as CLSQL-UFFI ; $ cd /Users/ken/.sbcl/site/clsql-5.0.5/uffi/; make cc -arch x86_64 -arch i386 -bundle /usr/lib/bundle1.o -flat_namespace -undefined suppress clsql_uffi.c -o clsql_uffi.dylib ld: duplicate symbol dyld_stub_binding_helper in /usr/lib/bundle1.o and /usr/lib/bundle1.o for architecture i386 ld: duplicate symbol dyld_stub_binding_helper in /usr/lib/bundle1.o and /usr/lib/bundle1.o for architecture x86_64 collect2: ld returned 1 exit status collect2: ld returned 1 exit status lipo: can't open input file: /var/folders/Nf/Nf4o5ArDFaWBH2OwtnWM3E+++TQ/-Tmp-//ccJyZxou.out (No such file or directory) make: *** [clsql_uffi.so] Error 1 Is there something I forgot, or some trick to get it to build on Mac OS X? I know very little about C libraries on the Mac these days, so I don't even know where to start on this. Thanks!

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