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  • PHP - Alternatives to runkit for intercepting method calls

    - by Radu
    I have some very test-unfriendly code (to say the least) that I need to test. Refactoring unfortunately is not an option. I have to test the code as it is, without the possibility of changing it. To do that, I was thinking of intercepting function calls and dynamically change what they do so I can run my tests, as I need some functions and methods to return known values, and I need others that make requests, connect to the database, etc, to stop doing that and return what I need them to return. Is there any way to do this without runkit_method_redefine(), which is preferably not "EXPERIMENTAL" and still maintained? Maybe an alternative to runkit? Maybe a better way? Edit: will use PHPUnit's test doubles and PHP 5.3.2's features for making private methods accessible, if I need that functionality.

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  • Modifying PROCTHROTTLEMAX with powercfg has no effect in 2008 R2

    - by AlexC
    I am trying to make the CPU transition to a lower P-state. I used pwrtest to determine the tests, and now I want to set the processor frequency to 50%. I executed the following command: powercfg -setacvalue SCHEME_BALANCED SUB_PROCESSOR PROCTHROTTLEMAX 50 When i query the scheme, the value is set to the desired value. However, the processor frequency is not modified (I am using CPU-Z to check the frequency). My system is running Windows 2008 R2. Any ideas? Thanks!

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  • Delphi 2010 Error Insight incorrectly flags "Undeclared Identifier"

    - by user257188
    In D2010, Error Insight is incorrectly underlining in red types like "TOpenDialog" (even though my unit and project's uses both include Dialogs). Also, in my method TMyFrame.Foo, it fails the same way by flagging a reference to a VCL component in my TMyFrame -- even though Foo and the component are both part of TMyFrame. SO suggested I read several threads on this subject. One mentions a D2009 fix for this. Is there a D2010 fix? Other postings have suggested that Error Insight yields too many false alarms and should just be turned off. Any suggestions?

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  • Does ActiveCollab subversion integration work with subversion over ssh?

    - by executor21
    I'm trying to setup a repository in an ActiveCollab project. During setup, it reports that the connection tests successfully. However, when I try to actually update the repository, I get the following message: Could not obrain the highest revision number for the given repository. If I try to browse the repository, the following error comes up: Fatal error: Call to a member function getRevision() on a non-object in /u/sites/activecollab/webroot/shared/activecollab/activecollab/application/modules/source/controllers/RepositoryController.class.php on line 357 Is this because of trying to access the repository via svn+ssh plugin rather than http? Or did something happen on the ActiveCollab end? The repository is accessed fine via other means -- only ActiveCollab has the problem.

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  • How to debug nHibernate/RhinoMocks TypeInitializer exception

    - by Joe Future
    Pulling my hair out trying to debug this one. Earlier this morning, this code was working fine, and I can't see what I've changed to break it. Now, whenever I try to open an nHibernate session, I'm getting the following error: Test method BCMS.Tests.Repositories.BlogBlogRepositoryTests.can_get_recent_blog_posts threw exception: System.TypeInitializationException: The type initializer for 'NHibernate.Cfg.Environment' threw an exception. --- System.Runtime.Serialization.SerializationException: Type is not resolved for member 'Castle.DynamicProxy.Serialization.ProxyObjectReference,Rhino.Mocks, Version=3.5.0.1337, Culture=neutral, PublicKeyToken=0b3305902db7183f'.. Any thoughts on how to debug what's going on here?

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  • Generate Visual Studio Project Templates with CruiseControl.Net or MSBuild

    - by Daniel A. White
    Hey all. I have a working workflow in CruiseControl.Net that successfully builds and tests an MSBuild project that is calling my Visual Studio 2010 solution. How do I create Visual Studio project templates in either CruiseControl.Net or with MSBuild? The build server does not have Visual Studio 2010 installed. Thanks for your time! Note: This can be extended to any other solution that could be scripted with a batch as well, but I cannot install Visual Studio 2010 on the machine.

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  • java.lang.NoClassDefFoundError: javax/persistence/Persistence

    - by ManWard
    hi , i'm using Netbeans 6.8 and build simple Maven web application project. create Entity and main file for persist Entity [also create persist unit] and use EclipsLink. but when i run main file get this error : Exception in thread "main" java.lang.NoClassDefFoundError: javax/persistence/Persistence at Main.main(Main.java:34) Caused by: java.lang.ClassNotFoundException: javax.persistence.Persistence at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) ... 1 more in netbeans projects window and in my project libraries folder only add this package : javaee-web-api-6.0.jar [provided] please help me for solve this Error thanks

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  • Comparing Dates in LINQ and C#

    - by Redburn
    I have a LINQ query which checks to see if there are any tests done since the beginning of the year. var MetersTestedCount = (from n in _mttDomainContext.MTTMeterTests where n.TestDate > DateTime.Parse("1/1/2010") select n.TestDate).Count(); This query however returns an empty set. I have a similar SQL query which pulls some records, USE MeterTestTracking Select * From MTTMeterTest WHERE TestDate > '1/1/2010' I have been to the previous posts. Even though similar, still no help: How to compare just the date, not the timestamp using LINQ and How to compare dates in LINQ? What's the correct way to check dates in LINQ to return a dataset?

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  • Making ehcache read-write for test code and read-only for production code

    - by Rick
    I would like to annotate many of my Hibernate entities that contain reference data and/or configuration data with @Cache(usage = CacheConcurrencyStrategy.READ_ONLY) However, my JUnit tests are setting up and tearing down some of this reference/configuration data using the Hibernate entities. Is there a recommended way of having entities be read-write during test setup and teardown but read-only for production code? Two of my immediate thoughts for non-ideal workarounds are: Using NONSTRICT_READ_WRITE, but I am not sure what the hidden downsides are. Creating subclassed entities in my test code to override the read-only cache annotation. Any recommendations on the cleanest way to handle this? (Note: Project uses maven.)

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  • Radio Button with html.radiobutton ASP.NET MVC

    - by vikitor
    Hello, I'm a newbie to all this ASP.NET MVC stuff, and I was making some tests for my project. I wanted to ask how is it possible to introduce a javascript function call from the html.radiobutton function. For example, how would you declare this: <input type="radio" name = "Kingdom" value = "All" onclick="GetSelectedItem(this);" checked ="checked" /> with html.radiobutton. I've been looking for some documentation, but I don't really get to understand, I guess it has something to do with the html object attributes, but don't really know the syntax and I haven't found any example. Thank you all in advance :) vikitor

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  • MS Build Script accepting a list or collection of project names to build and deploy

    - by Darryn Parker
    I want to create a MS Build script (executed by way of TFS Build Server) that will accept a list of project names that need to be built, unit tested and deployed. The reason is that I want one script to serve many 'like' structured solutions. All the solutions are SOA in nature and share the same framework, project structure and deployment requirements. I've done this in Nant and acheived great success out of having one build file serving 4 solutions - it just accepted a list of web project names to compile and deploy to our test/uat environments. What is the syntax to cycle through a collection of project names suppled as params via MS Build?

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  • F# PowerPack 2.0.0.0 issue: The task ..."…\fslex.exe" is invalid

    - by Roman Kuzmin
    I have upgraded F# PowerPack today to the latest 2.0.0.0 and tried to rebuild the MiniCalc sample from here: http://achrissmith.blogspot.com/2010/04/fslex-and-fsyacc-examples-updated.html If I build it in VS 2010 it fails with the message: C:\Program Files\MSBuild\FSharp\1.0\FSharp.PowerPack.targets(32,3): error MSB6004: The specified task executable location "C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\fslex.exe" is invalid. If I build it from the command line by MSBuild it complains about missing C:\Windows\Microsoft.NET\Framework\v4.0.30319\fslex.exe The problem is kind of “fixed” if I copy fslex and fsyacc to that both directories, so after that I can build from the command line and from VS 2010. But it does not look like a right way to solve the problem. What is the right way? EDIT: The same issue is true for the PowerPack sample from sources: May2010\workyard\tests\LexAndYaccMiniProject. Now (after the trick I have done) it is built fine, too.

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  • Setting the value (selected option) of a dijit.form.Select widget

    - by Wahnfrieden
    I have a dijit.form.Select widget. It's tied to a data store, if that matters. It's filled with several options already. All I want to do is programmatically set its value. I can get its value using myWidget.attr('value') but if I try to do myWidget.attr('value', 5) for example (where 5 is one of the valid values), all it does is reset the widget to select the very first option, no matter what value I give it. This seems to be a bug, and there aren't any tests or documentation which show how to accomplish what I want to. But is there some way, even if it's a dirty hack? I'm using Dojo 1.4.0. Note that dijit.form.Select is the new name for dojox.form.DropDownSelect. edit: I even tried resetting the widget with all new options, but it ignores the option which has selected = true and just selects the first option. There must still be a way though.

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  • Too late to become a programmer?

    - by Tomas
    Hi, Working in IT for 5 years, I focused on system integration - testing, performance tests and analysis, automation etc. Altough I am working for one of the biggest IT companies, I have the possibility to come up with my own ideas and realize them - for example I have written C# (with SQL backend) bugtracker application with management elements...and I really liked it. I am very creative person but being 25 y/o, I am wondering whether it is too late. I understand the logic of programming but as I was never very good in math I assume I have no chance to become professional programmer in this age. What do you think? Thanks

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  • .NET Framework 4 Client Profile vs .NET Framework 3.5 Client Profile

    - by Janusz
    Currently I am targeting .NET Framework 3.5 Client profile. Under certain conditions (when .NET 1.x or 2.x is installed) the client profile is not installed and instead full version of .NET Framework 3.5. is installed. This limitation has been removed from .NET 4.0 profile - therefore its a nice improvement that significantly reduces download size on certain PCs. However, if I target application to .NET 4.0 then all the clients will have to download new framework. I think ideal scenario would be to target .NET 3.5 profile but point installer to .NET 4.0 client profile. This way PCs with 3.5 installed (65% from our tests at the moment) would be fine and the rest would install .NET 4.0. Is my thinking correct or its not feasible? Will .NET 3.5 profile application run with only .NET 4.0 profile installed? Thank you

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  • RCov started analyzing loaded libs (including Rdoc itself) – when using rvm (Ruby Version Manager)

    - by phvalues
    Context rcov 0.9.8 2010-02-28 ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.3.0] rvm 0.1.38 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] System Ruby (rvm use system): ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10] Files The test setup is a 'lib' folder containing a single file which defines a class, the folders 'test' and 'test/sub_test', with 'sub_test' containing the single 'test_example_lib.rb' and a Rakefile like this: require 'rcov/rcovtask' task :default = [:rcov] desc "RCov" Rcov::RcovTask.new do | t | t.test_files = FileList[ 'test/**/test_*.rb' ] end Result #rake (in /Users/stephan/tmp/rcov_example) rm -r coverage Loaded suite /Users/stephan/.rvm/gems/ruby-1.8.7-p174/bin/rcov Started . Finished in 0.000508 seconds. 1 tests, 2 assertions, 0 failures, 0 errors +----------------------------------------------------+-------+-------+--------+ | File | Lines | LOC | COV | +----------------------------------------------------+-------+-------+--------+ |...ms/rcov-0.9.8/lib/rcov/code_coverage_analyzer.rb | 271 | 156 | 5.1% | |...ems/rcov-0.9.8/lib/rcov/differential_analyzer.rb | 116 | 82 | 9.8% | |lib/example_lib.rb | 16 | 11 | 72.7% | +----------------------------------------------------+-------+-------+--------+ |Total | 403 | 249 | 9.6% | +----------------------------------------------------+-------+-------+--------+ 9.6% 3 file(s) 403 Lines 249 LOC Question Why is RCov itself analysed here? I'd expect that (and it doesn't happen when using 'rvm use system'). In fact it seems to be due to me using a Ruby installed via rvm.

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  • profiling WCF services with visual studio profiler

    - by ashish.s
    I am trying to profile a WCF service using visual studio profiler. So i created a profile by choosing asp.net application, and gave it the url of the web service. When i launch the session, it launches a web page to the site. I then run my unit test using another visual studio client, but the test always fails with with communication exception, and the process that performance analyze is attached to exits out. if i run the test again, it attached the process again, but the tests still fails with communication exception. This is throwing my report off since its only accounting for the startup work that the application is supposed to do. can someone point out what i am doing wrong ?

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  • What is the difference between DVCS systems?

    - by Stephen
    What is the difference between DVCS systems? Seriously, wikipedia doesn't cover it well, and I read an article on HN recently comparing git and bzr in some detail, but the author admitted knowing little about mercurial, and the other options didn't get mentioned. (I'm happily using fossil on small win/mac/Linux projects) Please restrict answers to the DVCS aspects of the tool, e.g. The basic unit of vc in hit is the repository- in bazaar it is the branch(http://unspecified.wordpress.com/2010/03/26/why-git-aint-better-than-x/). bugtrackers and wikis are nice, but I'm really interested in the tools themselves, rather than any extras. Unfortunately SO demands a single 'right answer', so I'm making the question community wiki in the hope that users will contribute their knowledge.

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  • What does a Software Developer actually do?

    - by chobo2
    Hi I am graduating from my Computer Science degree in a few weeks from now!! I started to look for my first job. For the last couple years I gotten really into web programming(Asp.net). My first choice would be to get a junior asp.net MVC developer but I don't any companies in my area use MVC yet or if they do they are not hiring. So my second choice would be a junior asp.net Webforms developer. My other choices after that would be forms applications, mobile applications using .Net and C#. As you can see I am looking for something with .Net. I spent the last couple years doing .Net projects for school, on my free time and love the Language and it would pain me right now to switch to something like php. So now I found a posting in my area for an Entry Software Developer. I like the fact that they are using .net and that it is entry job(I never worked in this industry and never had more then like a tutoring job so I want to for like intermediate jobs). Posting Are you looking for an exciting challenge within a dynamic, people-oriented culture where you can launch your technical career? Company Name Inc. is a technology consulting company, located in Canada, that designs, develops, and delivers real-time interactive applications accessed via the Internet as well as back-end tools to support these applications. Company Name provides a combination of out-of-the-box and customized solutions to an expanding list of partners and customers. POSITION SUMMARY As a member of our team, the successful candidate will be responsible for helping us increase the quality and stability of our software systems by working jointly and directly with both the Software Development teams and the QA Team. The primary mission of this role will be to substantially enhance our test automation suite. The incumbent will design and program automated tests (unit, integration, system, stress and load) in Visual Studio using C# and will develop sound processes that help us identify and resolve defects as early as possible. The successful incumbent will help us improve and enhance system functionality, reliability, performance and scalability. This role is specifically designed for an eager, bright, new graduate who is looking for a stepping stone into a software engineering role. We promote from within and invite new graduates to apply for this important position - which may lead to new opportunities. We also offer a generous professional development plan to help you on your way. You will be a key part of a team of experts that is responsible for improving the quality of our software by: • Designing, writing, and executing test plans and programmatic tests in Visual Studio using C# and NUnit for functional testing of our code, new features, regression, and performance test procedures. • Working with the engineers to design and build the stress and load testing framework which emulates tens and even hundreds of thousands of concurrent users via a distributed network interfacing with our Load Testing Lab. • Interfacing with both the Development Team and the QA Team to ensure risks are identified and managed. • Mentoring and leading the QA Team in programmatic test automation technologies and tools. MUST HAVE SKILLS / QUALIFICATIONS: • Diploma or higher Degree in Computer Science, or equivalent formal training. • Fundamental C# programming skills. • Knowledge of Internet technologies and Microsoft Windows platforms. • Knowledge of PC hardware. • Excellent communication skills (both oral and written). • Self-starter who takes initiative, requires minimal supervision, can handle multiple simultaneous tasks. • Detail-oriented, able to concentrate, and work quickly. • Proven diagnostic, analytical, and problem solving skills. NICE TO HAVE SKILLS: • Exposure to Visual Studio Team System or Visual Studio Test Edition. • Exposure in C# using NUnit. • Exposure to NUnit, HTTPUnit, and other automation tool suites. • Exposure to Performance/Stress/Load Testing. • Good understanding of relational databases (MS SQL Server). • Familiar with video and online multi-player games. As part of our team you will have the opportunity to work with a supportive team of experts, drive your own success, and ride the wave as we continually expand our team of experts. If you are interested in this opportunity, please send your resume to [email protected] with “Entry Level Software Developer” in the subject line. So that is the posting. To me it sounds like it is QA job. I don't have anything against QA jobs but alot of them seems to be your just clicking buttons and running scripts. Is this what a typical software developer does? Like I am so on the fence to apply for this job. On one side I am not sure how much programming I would be doing. Like I want to be at least half the time programming otherwise my skills will never improve since I will never be programming in teams and stuff. At the same time I have no experience in the industry so on the other side I am thinking just go for it and then maybe a year later try to get a full programming job(provided that I got the job). Yet if I am not programming in that job then that experience will not help me for the next job I find as I will be back a square one.

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  • Can I override task :environment in test_helper.rb to test rake tasks?

    - by Michael Barton
    I have a series of rake tasks in a Rakefile which I'd like to test as part of my specs etc. Each task is defined in the form: task :do_somthing => :environment do # Do something with the database here end Where the :environment task sets up an ActiveRecord/DataMapper database connection and classes. I'm not using this as part of Rails but I have a series of tests which I like to run as part of BDD. This snippet illustrates how I'm trying to test the rake tasks. def setup @rake = Rake::Application.new Rake.application = @rake load File.dirname(__FILE__) + '/../../tasks/do_something.rake' end should "import data" do @rake["do_something"].invoke assert something_in_the_database end So my request for help - is it possible to over-ride the :environment task in my test_helper.rb file so I my rake testing interacts with the my test database, rather than production? I've tried redefining the task in the helper file, but this doesn't work. Any help for a solution would be great, as I've been stuck on this for the past week.

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  • Embedded Linux or eCos ?

    - by mawg
    One way to look at it - embedded Linux starts with desktop Linux & ditches the parts not needed for embedded systems (is this actually true?), whereas eCos is designed from the ground up for embedded systems. Now, assume an ARM processor, probably ARM 7 - does performance make a difference? Actually, we talking a very low load system, max 500 transactions a day. Any advantages of one over the other (or FreeRTOS, etc)? Stability, maturity, performance, development tools, anything else? All that I can think of is that if I am certain that I will never port to another o/s, then if I go with embedded Linux, I don't need an o/s abstraction layer to allow me to do unit testing on host (desktop Linux box). Any thoughts or comments? Thanks.

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  • Using NHibernate Criteria API to select sepcific set of data together with a count

    - by mfloryan
    I have the following domain set up for persistence with NHibernate: I am using the PaperConfiguration as the root aggregate. I want to select all PaperConfiguration objects for a given Tier and AcademicYearConfiguration. This works really well as per the following example: ICriteria criteria = session.CreateCriteria<PaperConfiguration>() .Add(Restrictions.Eq("AcademicYearConfiguration", configuration)) .CreateCriteria("Paper") .CreateCriteria("Unit") .CreateCriteria("Tier") .Add(Restrictions.Eq("Id", tier.Id)) return criteria.List<PaperConfiguration>(); (Perhaps there is a better way of doing this though). Yet also need to know how many ReferenceMaterials there are for each PaperConfiguration and I would like to get it in the same call. Avoid HQL - I already have an HQL solution for it. I know this is what projections are for and this question suggests an idea but I can't get it to work. I have a PaperConfigurationView that has, instead of IList<ReferenceMaterial> ReferenceMaterials the ReferenceMaterialCount and was thinking along the lines of ICriteria criteria = session.CreateCriteria<PaperConfiguration>() .Add(Restrictions.Eq("AcademicYearConfiguration", configuration)) .CreateCriteria("Paper") .CreateCriteria("Unit") .CreateCriteria("Tier") .Add(Restrictions.Eq("Id", tier.Id)) .SetProjection( Projections.ProjectionList() .Add(Projections.Property("IsSelected"), "IsSelected") .Add(Projections.Property("Paper"), "Paper") // and so on for all relevant properties .Add(Projections.Count("ReferenceMaterials"), "ReferenceMaterialCount") .SetResultTransformer(Transformers.AliasToBean<PaperConfigurationView>()); return criteria.List< PaperConfigurationView >(); unfortunately this does not work. What am I doing wrong? The following simplified query: ICriteria criteria = session.CreateCriteria<PaperConfiguration>() .CreateCriteria("ReferenceMaterials") .SetProjection( Projections.ProjectionList() .Add(Projections.Property("Id"), "Id") .Add(Projections.Count("ReferenceMaterials"), "ReferenceMaterialCount") ).SetResultTransformer(Transformers.AliasToBean<PaperConfigurationView>()); return criteria.List< PaperConfigurationView >(); creates this rather unexpected SQL: SELECT this_.Id as y0_, count(this_.Id) as y1_ FROM Domain.PaperConfiguration this_ inner join Domain.ReferenceMaterial referencem1_ on this_.Id=referencem1_.PaperConfigurationId The above query fails with ADO.NET error as it obviously is not a correct SQL since it is missing a group by or the count being count(referencem1_.Id) rather than (this_.Id). NHibernate mappings: <class name="PaperConfiguration" table="PaperConfiguration"> <id name="Id" type="Int32"> <column name="Id" sql-type="int" not-null="true" unique="true" index="PK_PaperConfiguration"/> <generator class="native" /> </id> <!-- IPersistent --> <version name="VersionLock" /> <!-- IAuditable --> <property name="WhenCreated" type="DateTime" /> <property name="CreatedBy" type="String" length="50" /> <property name="WhenChanged" type="DateTime" /> <property name="ChangedBy" type="String" length="50" /> <property name="IsEmeEnabled" type="boolean" not-null="true" /> <property name="IsSelected" type="boolean" not-null="true" /> <many-to-one name="Paper" column="PaperId" class="Paper" not-null="true" access="field.camelcase"/> <many-to-one name="AcademicYearConfiguration" column="AcademicYearConfigurationId" class="AcademicYearConfiguration" not-null="true" access="field.camelcase"/> <bag name="ReferenceMaterials" generic="true" cascade="delete" lazy="true" inverse="true"> <key column="PaperConfigurationId" not-null="true" /> <one-to-many class="ReferenceMaterial" /> </bag> </class> <class name="ReferenceMaterial" table="ReferenceMaterial"> <id name="Id" type="Int32"> <column name="Id" sql-type="int" not-null="true" unique="true" index="PK_ReferenceMaterial"/> <generator class="native" /> </id> <!-- IPersistent --> <version name="VersionLock" /> <!-- IAuditable --> <property name="WhenCreated" type="DateTime" /> <property name="CreatedBy" type="String" length="50" /> <property name="WhenChanged" type="DateTime" /> <property name="ChangedBy" type="String" length="50" /> <property name="Name" type="String" not-null="true" /> <property name="ContentFile" type="String" not-null="false" /> <property name="Position" type="int" not-null="false" /> <property name="CommentaryName" type="String" not-null="false" /> <property name="CommentarySubjectTask" type="String" not-null="false" /> <property name="CommentaryPointScore" type="String" not-null="false" /> <property name="CommentaryContentFile" type="String" not-null="false" /> <many-to-one name="PaperConfiguration" column="PaperConfigurationId" class="PaperConfiguration" not-null="true"/> </class>

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  • How to enter text in AJAX HTML Editor using watin

    - by Shaki
    Hi, I could not figure out how to enter text into HTML Editor using Watin. I tried //ie.TextField(Find.ById("htmlDetail_ctl06_ctl04")).TypeText("ABCD"); But got error: Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus. Can you give some example how to enter text into AJAX HTML Editor using watin please? I am not sure what to plug in frameSrc and java script from this solution - http://stackoverflow.com/questions/939448/unit-testing-the-ms-ajax-toolkit-html-editor Here is html from Develper tool when click the text box: Thanks in advance

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  • django - dynamic form fieldsets

    - by user110029
    A form will be spitting out an unknown number of questions to be answered. each question contains a prompt, a value field, and a unit field. The form is built at runtime in the formclass's init method. I'd like each question rendered on the form as an inline: prompt, value(input-text), units (select). this seems a case perfect for iterable form fieldsets, which could be easily styled. but since fieldsets - such as those in django-form-utils are defined as tuples, they are immutable... and I can't find a way to define them at runtime. is this possible, or perhaps another solution?

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  • How can I implement an abstract singleton class in Java?

    - by Simon
    Here is my sample abstract singleton class: public abstract class A { protected static A instance; public static A getInstance() { return instance; } //...rest of my abstract methods... } And here is the concrete implementation: public class B extends A { private B() { } static { instance = new B(); } //...implementations of my abstract methods... } Unfortunately I can't get the static code in class B to execute, so the instance variable never gets set. I have tried this: Class c = B.class; A.getInstance() - returns null; and this ClassLoader.getSystemClassLoader().loadClass("B"); A.getInstance() - return null; Running both these in the eclipse debugger the static code never gets executed. The only way I could find to get the static code executed is to change the accessibility on B's constructor to public, and to call it. I'm using sun-java6-jre on Ubuntu 32bit to run these tests.

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