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  • final fields and thread-safety

    - by pcjuzer
    Should it be all fields, including super-fields, of a purposively immutable java class 'final' in order to be thread-safe or is it enough to have no modifier methods? Suppose I have a POJO with non-final fields where all fields are type of some immutable class. This POJO has getters-setters, and a constructor wich sets some initial value. If I extend this POJO with knocking out modifier methods, thus making it immutable, will extension class be thread-safe?

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  • how to call operator () in c++

    - by anish
    in c++ i have following code class Foobar{ public: Foobar * operator()(){ return new Foobar; } My quesion is how to call the (); if i do Foobar foo() the constructor gets called i am confused about behaviour of () can some explain me

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  • flash as2: how can i create custom event with parameters ?

    - by ufk
    Hiya. I would like to be able to create custom event with parameters and to dispatch them when needed. in as3 i can create a class that extends flash.events.Event, add parameters to it's constructor and then use addEventListener and dispatchEvent where required. how can I do so in ActionScript 2 ? thanks!

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  • Deleting dynamic array of char in C++.

    - by anonymous
    I have this class, with the atribute 'word' class Node { char *word; Inside the Node constructor, I do this asignation: word = new char[strlen(someword)]; In the destructor of the Node class, I try to delete the contents pointed by word: delete []word; I obtain the next message after executing the programs: "Heap block at 003E4F48 modified at 003E4F51 past requested size of 1" What am I not doing well?

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  • Default value for bool in c++

    - by greenguy1090
    I'm redesigning a class constructor in C++ and need it to catch an unspecified bool. I have used default values for all of the other parameters, but from my understanding bool can only be initialized to true or false. Since both of those cases have meaning in the class, how should I handle checking for change from a default value?

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  • Hive metadata permission issue

    - by Chandramohan
    We are getting this error on Hive, while creating a DB / table hive> CREATE TABLE pokes (foo INT, bar STRING); FAILED: Error in metadata: javax.jdo.JDOFatalDataStoreException: Cannot get a connection, pool error Could not create a validated object, cause: A read-only user or a user in a read-only database is not permitted to disable read-only mode on a connection. NestedThrowables: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Could not create a validated object, cause: A read-only user or a user in a read-only database is not permitted to disable read-only mode on a connection. FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask Hive log : org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Could not create a validated object, cause: A read-only user or a user in a read-only database is not permitted to disable read-only mode on a connection. at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:298) at org.datanucleus.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:601) at org.datanucleus.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:286) at org.datanucleus.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:182) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at javax.jdo.JDOHelper$16.run(JDOHelper.java:1958) at java.security.AccessController.doPrivileged(Native Method) at javax.jdo.JDOHelper.invoke(JDOHelper.java:1953) at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1159) at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:803) at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:698) at org.apache.hadoop.hive.metastore.ObjectStore.getPMF(ObjectStore.java:234) at org.apache.hadoop.hive.metastore.ObjectStore.getPersistenceManager(ObjectStore.java:261) at org.apache.hadoop.hive.metastore.ObjectStore.initialize(ObjectStore.java:196) at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:171) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:354) at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.executeWithRetry(HiveMetaStore.java:306) at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:451) at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:232) at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.<init>(HiveMetaStore.java:197) at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.<init>(HiveMetaStoreClient.java:108) at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:1868) at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:1878) at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:470) ... 15 more Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool error Could not create a validated object, cause: A read-only user or a user in a read-only database is not permitted to disable read-only mode on a connection. at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:114) at org.datanucleus.store.rdbms.ConnectionFactoryImpl$ManagedConnectionImpl.getConnection(ConnectionFactoryImpl.java:521) at org.datanucleus.store.rdbms.RDBMSStoreManager.<init>(RDBMSStoreManager.java:290) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:588) at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:300) at org.datanucleus.ObjectManagerFactoryImpl.initialiseStoreManager(ObjectManagerFactoryImpl.java:161) at org.datanucleus.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:583) ... 42 more Caused by: java.util.NoSuchElementException: Could not create a validated object, cause: A read-only user or a user in a read-only database is not permitted to disable read-only mode on a connection. at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1191) at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106) ... 52 more 2011-08-11 18:02:36,964 ERROR ql.Driver (SessionState.java:printError(343)) - FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

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  • WPF dynamic layout: how to enforce square proportions (width equals height)?

    - by Gart
    I'm learning WPF and can't figure out how to enfore my buttons to take a square shape. Here is my XAML Markup: <Window x:Class="Example" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="368" Width="333"> <Window.Resources> <Style x:Key="ToggleStyle" BasedOn="{StaticResource {x:Type ToggleButton}}" TargetType="{x:Type RadioButton}"> </Style> </Window.Resources> <RadioButton Style="{StaticResource ToggleStyle}"> Very very long text </RadioButton> </Window> Specifying explicit values for Width and Height attributes seems like a wrong idea - the button should calculate its dimensions based on its contents automagically, but keep its width and height equal. Is this possible?

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  • FSharp.Compiler.CodeDom for VS2008 and VS2010 side-by-side

    - by SztupY
    I'm using FSharp.Compiler.CodeDom to dynamically create F# classes. The problem is, that I have both VS2008 and VS2010 on my computer side-by-side (they works fine), and using F# in this configuration is buggy at best: If I don't install InstallFSharp.msi, then under VS2008 the built classes complain about not finding FSharp.Core (even if they're referenced) If I install InstallFSharp.msi, then under VS2008 the built classes will use the F# built for VS2010, and will throw a binary-incompatibility exception, because it will load the .net4 variant: FSC: error FS0219: The referenced or default base CLI library 'mscorlib' is binary- incompatible with the referenced F# core library 'C:\Program Files (x86)\Microsoft F#\v4.0\FSharp.Core.dll'. Consider recompiling the library or making an explicit reference to a version of this library that matches the CLI version you are using. If I replace the F# found at the previous location to the separately installed dll-s, then of course VS2010 will complain about binary-incompatibility Am I overlooking something, or they won't simply work for a shared environment like this? This might mean real problems when I deploy the applications. Thanks

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  • jquery .live on load event

    - by bandhunt
    I need a way to use the jquery .live() function to act on elements that are loaded via ajax. For instance a div is loaded via ajax .load() <div id="mydiv"></div> Normally I do .live() with a click event, but I need to know how to tell the dom that this new div has loaded without any explicit actions/events from the user. This code doesn't work, but I want to do something like this: mydiv = $("#mydiv"); mydiv.live("mydiv.length > 0", function() { // do something }); The "mydiv.length" being a substitue for the typical "click" or other event.

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  • MVC map to nullable bool in model

    - by fearofawhackplanet
    With a view model containing the field: public bool? IsDefault { get; set; } I get an error when trying to map in the view: <%= Html.CheckBoxFor(model => model.IsDefault) %> Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?) I've tried casting, and using .Value and neither worked. Note the behaviour I would like is that submitting the form should set IsDefault in the model to true or false. A value of null simply means that the model has not been populated.

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  • linq to sql -> join

    - by ile
    SQL query: SELECT ArticleCategories.Title AS Category, Articles.Title, Articles.[Content], Articles.Date FROM ArticleCategories INNER JOIN Articles ON ArticleCategories.CategoryID = Articles.CategoryID Object repository: public class ArticleRepository { private DB db = new DB(); // // Query Methods public IQueryable<Article> FindAllArticles() { var result = from category in db.ArticleCategories join article in db.Articles on category.CategoryID equals article.CategoryID select new { CategoryID = category.CategoryID, CategoryTitle = category.Title, ArticleID = article.ArticleID, ArticleTitle = article.Title, ArticleDate = article.Date, ArticleContent = article.Content }; return result; } .... } And finally, I get this error: Error 1 Cannot implicitly convert type 'System.Linq.IQueryable' to 'System.Linq.IQueryable'. An explicit conversion exists (are you missing a cast?) C:\Documents and Settings\ilija\My Documents\Visual Studio 2008\Projects\CMS\CMS\Models\ArticleRepository.cs 29 20 CMS Any idea what did I do wrong? Thanks, Ile

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  • C#: Fill DataGridView From Anonymous Linq Query

    - by mdvaldosta
    // From my form BindingSource bs = new BindingSource(); private void fillStudentGrid() { bs.DataSource = Admin.GetStudents(); dgViewStudents.DataSource = bs; } // From the Admin class public static List<Student> GetStudents() { DojoDBDataContext conn = new DojoDBDataContext(); var query = (from s in conn.Students select new Student { ID = s.ID, FirstName = s.FirstName, LastName = s.LastName, Belt = s.Belt }).ToList(); return query; } I'm trying to fill a datagridview control in Winforms, and I only want a few of the values. The code compiles, but throws a runtime error: Explicit construction of entity type 'DojoManagement.Student' in query is not allowed. Is there a way to get it working in this manner?

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  • How do I base a style on a Silverlight toolkit theme style

    - by Ian Oakes
    I've being trying to add a theme from the Silverlight toolkit to a project. In the project there are a number of existing styles used in the layout. The problem is when any control has an explict style applied to it does not receive any attributes of the style from the theme. In WPF I would use something like BasedOn={x:Type TextBox}, but this is not supported in Silverlight. I've considered going through the theme and setting a key for every style and then using BasedOn to create both an implicit style to use with the ImplictStyleManager, as well as another explicit style for use with the existing styled controls. Have you got any better ideas?

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  • What is the purpose of both target API and minSDK

    - by Scott Ferguson
    Can somebody explain to me the difference between the project target and the minimum SDK? I want my app to run on Donut devices, and the APK I built with a target of 7 worked just fine. When I set an explicit minimum SDK in the Android manifest of 4 (1.6) the compiler bitched at me that the target exceeded the minimum. I reset the target to 4 only to see what would happen, and now I've got compiler errors. An example is the START_NOT_STICKY constant in android.app.Service. It doesn't exist in API level 4, but does exist in API level 7. This is also the case with Service.onStartCommand(). In API level 7 you need to explicity override this method, whereas in API level 4 you don't. So why does the app work in 1.6 despite all this? How could 1.6 know how to use SERVICE_NOT_STICKY when the associated API level doesn't know about it?

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  • How do I unescape HTML entities in a string in Python 3.1?

    - by Sho Minamimoto
    I have looked all around and only found solutions for python 2.6 and earlier, NOTHING on how to do this in python 3.X. (I only have access to Win7 box.) I HAVE to be able to do this in 3.1 and preferably without external libraries. Currently, I have httplib2 installed and access to command-prompt curl (that's how I'm getting the source code for pages). Unfortunately, curl does not decode html entities, as far as I know, I couldn't find a command to decode it in the documentation. YES, I've tried to get Beautiful Soup to work, MANY TIMES without success in 3.X. If you could provide EXPLICIT instructions on how to get it to work in python 3 in MS Windows environment, I would be very grateful. So, to be clear, I need to turn strings like this: Suzy &amp; John into a string like this: "Suzy & John".

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  • Calculate Matrix Rank using scipy

    - by Hooked
    I'd like to calculate the mathematical rank of a matrix using scipy. The most obvious function numpy.rank calculates the dimension of an array (ie. scalars have dimension 0, vectors 1, matrices 2, etc...). I am aware that the numpy.linalg.lstsq module has this capability, but I was wondering if such a fundamental operation is built into the matrix class somewhere. Here is an explicit example: from numpy import matrix, rank A = matrix([[1,3,7],[2,8,3],[7,8,1]]) print rank(A) This gives 2 the dimension, where I'm looking for an answer of 3.

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  • What is the best way to remove accents in a python unicode string?

    - by MiniQuark
    I have a unicode string in python, and I would like to remove all the accents (diacritics). I found on the Web an elegant way to do this in Java: convert the unicode string to its long normalized form (with a separate character for letters and diacritics) remove all the characters whose unicode type is "diacritic". Do I need to install a library such as pyICU or is this possible with just the python standard library? And what about in python 3.0? Important note: I would like to avoid code with an explicit mapping from accented characters to their non-accented counterpart. Thanks for your help.

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  • registering httpModules in web.config

    - by Praesagus
    I am trying to register a custom HttpHandler in the web.config file. MSDN's example shows an entry that is commented out...um which doesn't work so well. When I uncomment I receive a Could not load file or assembly 'HttpModule.cs' or one of its dependencies. The system cannot find the file specified. error. The file name is HttpModule.cs and the class name is MyHttpModule. There is no explicit namespace yet. <httpModules> <add name="MyHttpModule" type="MyHttpModule, HttpModule" /> <httpModules> I am sure I am overlooking the obvious. Do I need to specify the file path somewhere? Thanks in advance.

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  • F# List of functions

    - by akaphenom
    I am trying to have a list of functions, but seem to be comming up empty handed. The basic code is something like this: let doSomething var = var let doSomething2 var = var let listOfStuff = [doSomething doSomething2] and I am getting the followiung exception: Error 2 Value restriction. The value 'listOfStuff' has been inferred to have generic type val queue : ('_a - '_a) list Either define 'queue' as a simple data term, make it a function with explicit arguments or, if you do not intend for it to be generic, add a type annotation. C:\fsharp\SentimentFramework\TradeSignalProcessor\Program.fs 16 9 TradeSignalProcessor I tried addin the [] attribute but that didn't work...

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  • WPF MenuItem ViewModel Command

    - by Jon Archway
    Hi, I am fairly new to WPF and am struggling a little with a scenario. I have a menu which has menu items. When one of these menu items gets clicked a method needs to be called that will do something based upon the text displayed associated with that menu item. So for example, the menu item's content was "test" so I would need to do something with "test". FYI, this "something" directly affects a collection on the ViewModel. This is easy to achieve using the click event and no ViewModel, but I was trying to implement MVVM using an explicit ViewModel. So I started to look into Commands but cannot see how I would pass anything from the View back into the Command in the ViewModel. Any suggestions on what I should be doing here? Thanks

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