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• How do you use stereotype annotations in Spring 2.5.x?

  - by grigory

  When moving to Spring 2.5.x I found that it adds more stereotype annotations (on top of @Repository from 2.0): @Component, @Service and @Controller. How do you use them? Do you rely on implicit Spring support or you define custom stereotype specific functions/aspects/features? Or is it predominately for marking beans (compile time, conceptual, etc.)?

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• Partial overriding in Java (or dynamic overriding while overloading)

  - by Lie Ryan

  If I have a parent-child that defines some method .foo() like this: class Parent { public void foo(Parent arg) { System.out.println("foo in Function"); } } class Child extends Parent { public void foo(Child arg) { System.out.println("foo in ChildFunction"); } } When I called them like this: Child f = new Child(); Parent g = f; f.foo(new Parent()); f.foo(new Child()); g.foo(new Parent()); g.foo(new Child()); the output is: foo in Parent foo in Child foo in Parent foo in Parent But, I want this output: foo in Parent foo in Child foo in Parent foo in Child I have a Child class that extends Parent class. In the Child class, I want to "partially override" the Parent's foo(), that is, if the argument arg's type is Child then Child's foo() is called instead of Parent's foo(). That works Ok when I called f.foo(...) as a Child; but if I refer to it from its Parent alias like in g.foo(...) then the Parent's foo(..) get called irrespective of the type of arg. As I understand it, what I'm expecting doesn't happen because method overloading in Java is early binding (i.e. resolved statically at compile time) while method overriding is late binding (i.e. resolved dynamically at compile time) and since I defined a function with a technically different argument type, I'm technically overloading the Parent's class definition with a distinct definition, not overriding it. But what I want to do is conceptually "partially overriding" when .foo()'s argument is a subclass of the parent's foo()'s argument. I know I can define a bucket override foo(Parent arg) in Child that checks whether arg's actual type is Parent or Child and pass it properly, but if I have twenty Child, that would be lots of duplication of type-unsafe code. In my actual code, Parent is an abstract class named "Function" that simply throws NotImplementedException(). The children includes "Polynomial", "Logarithmic", etc and .foo() includes things like Child.add(Child), Child.intersectionsWith(Child), etc. Not all combination of Child.foo(OtherChild) are solvable and in fact not even all Child.foo(Child) is solvable. So I'm best left with defining everything undefined (i.e. throwing NotImplementedException) then defines only those that can be defined. So the question is: Is there any way to override only part the parent's foo()? Or is there a better way to do what I want to do?

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• Why aren't static const floats allowed?

  - by Jon Cage

  I have a class which is essentially just holds a bunch of constant definitions used through my application. For some reason though, longs compile but floats do not: class MY_CONSTS { public : static const long LONG_CONST = 1; // Compiles static const float FLOAT_CONST = 0.001f; // C2864 }; Gives the following error: 1>c:\projects\myproject\Constant_definitions.h(71) : error C2864: 'MY_CONSTS::FLOAT_CONST' : only static const integral data members can be initialized within a class Am I missing something?

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• "is not abstact and does not override abstract method."

  - by Chris Bolton

  So I'm pretty new to android development and have been trying to piece together some code bits. Here's what I have so far: package com.teslaprime.prirt; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.AdapterView.OnItemClickListener; import java.util.ArrayList; import java.util.List; public class TaskList extends Activity { List<Task> model = new ArrayList<Task>(); ArrayAdapter<Task> adapter = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button add = (Button) findViewById(R.id.add); add.setOnClickListener(onAdd); ListView list = (ListView) findViewById(R.id.tasks); adapter = new ArrayAdapter<Task>(this,android.R.layout.simple_list_item_1,model); list.setAdapter(adapter); list.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(View v, int position, long id) { adapter.remove(position); } });} private View.OnClickListener onAdd = new View.OnClickListener() { public void onClick(View v) { Task task = new Task(); EditText name = (EditText) findViewById(R.id.taskEntry); task.name = name.getText().toString(); adapter.add(task); } }; } and here are the errors I'm getting: compile: [javac] /opt/android-sdk/tools/ant/main_rules.xml:384: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds [javac] Compiling 2 source files to /home/chris-kun/code/priRT/bin/classes [javac] /home/chris-kun/code/priRT/src/com/teslaprime/prirt/TaskList.java:30: <anonymous com.teslaprime.prirt.TaskList$1> is not abstract and does not override abstract method onItemClick(android.widget.AdapterView<?>,android.view.View,int,long) in android.widget.AdapterView.OnItemClickListener [javac] list.setOnItemClickListener(new OnItemClickListener() { [javac] ^ [javac] /home/chris-kun/code/priRT/src/com/teslaprime/prirt/TaskList.java:32: remove(com.teslaprime.prirt.Task) in android.widget.ArrayAdapter<com.teslaprime.prirt.Task> cannot be applied to (int) [javac] adapter.remove(position); [javac] ^ [javac] 2 errors BUILD FAILED /opt/android-sdk/tools/ant/main_rules.xml:384: Compile failed; see the compiler error output for details. Total time: 2 seconds any ideas?

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• is multiple inheritance a compiler writers problem? - c++

  - by Dr Deo

  i have been reading about multiple inheritance http://stackoverflow.com/questions/225929/what-is-the-exact-problem-with-multiple-inheritance http://en.wikipedia.org/wiki/Diamond_problem http://en.wikipedia.org/wiki/Virtual_inheritance http://en.wikipedia.org/wiki/Multiple_inheritance But since the code does not compile until the ambiguity is resolved, doesn't this make multiple inheritance a problem for compiler writers only? - how does this problem affect me in case i don't want to ever code a compiler

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• Can't convert the PocketPC project in Visual Studio 2010 project format

  - by nihi_l_ist

  Just downloaded the Visual Studio 2010 Premium and realized that can't compile the project, made for PDA! The error log in output window says: Loading D:\Work...\PDA2.csproj ... D:\Work...\PDA2.csproj : error : The project file 'D:\Work...\PDA2.csproj' cannot be opened. The project type is not supported by this installation. I want to know if mobile development projects are supported in RTM version or they are deprecated?

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• Declaring an array of linked list in C#

  - by xarzu

  I got the compile error message "Array size cannot be specified in a variable declaration (try initializing with a 'new' expression)" when I tried to declare an array of linked lists. public LinkedList[2] ExistingXMLList; Also, if I wanted to create a small array of strings, isn't this the way: string [2] inputdata;

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• Most complicated C code to read

  - by cprogrammer

  ITT: Post a program that doesn't do anything, but breaks all syntax highlighting. ??=include<stdio.h> // lol????/ why does this compile???????/ haha :> int main()<%int lol<:0x1UL??);printf("%.""0s",(0[lol]??'=*lol,&lol<:(unsigned)"hi"??)));??>

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• What exactly are signals and slots in Qt?

  - by Jen

  I know how they work conceptually, but how are signals and slots implemented in the Qt framework? Qt Creator treats them as keywords, but are they simply a set of macros, or is a special pre-processor required before these source files can be compiled? In other words, if I use Qt's signal/slot features in my code, can I easily compile it on any C++ compiler?

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• Config Erro Message when dont connect to database

  - by Rafael

  Hi, I need to know a way to show a message or something like that when I compile my program and the user or password are wrong, because when I do this nothing happens. I'm making a system that save logs. log4net just using C#. if you can help me I'd appreciate. thanks!

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• How to dynamically load aspx code from a database?

  - by labilbe

  I have content like this stored in a database <p>This a sample text. <%= Html.ActionLink("test", "myaction", "mycontroller") %></p> The content is part of my data repository, that is the reason I want to keep it inside the database. I would like to know how it is possible to render it and execute it at compile time. I am using it on an asp.net mvc project. Thank you.

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• Visual Studio 2010, using VB.NET. Intellisense does not recognize new property until I recompile

  - by Velika

  I have an ASP.NET VB.NET web project that references a VB.NET class library. I add a new property to a class in the class library, then, from the web app, I expect to be able to use it immediately w/o errors and with full intellisense. It used to work in 2008. When I compile the class library, it becomes available but not until. Was this nice feature taken away, perhaps in the interest of speed?

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• Error in rounding off values using .round in Ruby

  - by Shreyas Satish

  The following piece of code works perfectly in script/console but returns the following error when i compile the same in a ruby script.: :in `round': wrong number of arguments (1 for 0) (ArgumentError) tf={"ph"={0=1.33333333333333, 1=1.5}, "fee"={0=1.66666666666667}, "test"={0=1.16666666666667, 1=1.25}, "what"={0=2.0, 1=2.0}, "for"={0=1.5}, "is"={0=1.83333333333333, 1=1.75}} tf.each{|k,v| v.each{|k1,v1| tf[k][k1]=(v1.round(5))}} Any Ideas ? Cheers !

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• How to @synthesize a C-Style array of pointers?

  - by Peter Hajas

  I have a property defined in a class like so: @interface myClass UIImageView *drawImage[4]; ... @property (nonatomic, retain) UIImageView **drawImage; ... @synthesize drawImage; // This fails to compile I have found similar questions on StackOverflow and elsewhere, but none that really address this issue. What is the most Objective-C kosher way to do this?

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• strip only html anchor tags.

  - by user283405

  i have following code that strip all tags. now i want to strip only anchor tags. x = re.compile(r'<[^<]*?/?>') how to modify so that only anchor tags stripped.

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• LaTeX Double Spacing

  - by reprogrammer

  I am using the acm LaTeX template and I have trouble making my paper double spaced. My LaTeX document looks like the following: \documentclass{acm_proc_article-sp} \usepackage{setspace} \doublespacing \begin{document} ... \end{document} When I compile the above document using pdflatex, I get the following error message on the line that I use the command \doublespacing: Missing number, treated as zero \doublespacing

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• Generics: How to derive from one of two classes?

  - by Yaron Naveh

  I have the following c# classes: class A : Object { foo() {} } class B : Object { foo() {} } I want to write a generic method that applies to both: void bar<T>(T t) { t.foo(); } this does not compile complaining the foo() is not a member of T. I can add a constraint for T to derive from one of the classes: void bar<T>(T t) where T : A but how can I have it for both?

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• Why do we need to use out keyword while calling a method

  - by Midhat

  When a method is defined with an out parameter, why do I have to specify the out keyword when calling it. Its already there in the method definition, and the runtime should know that any parameter passed will be an out parameter. It would make sense if the compiler will accept the argument with or without out keyword, with different semantic, but if you MUST add the keyword to make the code compile, whats the use? Shouldn't the compiler handle it automatically? Same for ref

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• Automating GNUStep from Notepad++

  - by kim3er

  I use GNUStep to compile Objective-C on Windows 7 using GCC and MinGW. I'd like to be able to automate the "make" instruction (with make files) from Notepad++ and have any complier errors reported to Notepad++s console window. Does anyone have any experience with this? Rich

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• R from C -- Simplest Possible Helloworld...

  - by jsight

  What is the simplest possible C function for starting the R interpreter, passing in a small expression (eg, 2+2), and getting out the result? I'm trying to compile with MingW on Windows.

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• What is Scriptol?

  - by Isaiah

  While searching I came across this. It looks interesting but I have absolutely no idea of what it's for. I like it because you can compile to php, a language I don't enjoy a lot that's really useful. This could be a way I can use php without touching it. The language is odd looking, is there anyone out there who has tried it? Thanks

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• ASP.NET application developed in 32 bit environment not working in 64 bit environment

  - by jgonchik

  We have developed an ASP.NET website on a Windows 7 - 32 bit platform using Visual Studio 2008. This website is being hosted at a hosting company where we share a server with hundreds of other ASP.NET websites. We are in the process of changing our hosting to a dedicated Windows 2008 - 64 bit server. We have installed Visual Studio on this new server in order to debug our application. If we try to start the application on this new server using Visual Studios 2008's own web server (not IIS 7) we get the error below. We have tried to compile the application in both 32 as well as 64 bit mode. We also tried to compile to "Any CPU". But nothing helps. We also tried running Visual Studio as an administrator but without success. We get the following error: Server Error in '/' Application. The specified module could not be found. (Exception from HRESULT: 0x8007007E) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E) Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)] System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0 System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43 System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +127 System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +142 System.Reflection.Assembly.Load(String assemblyString) +28 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46 [ConfigurationErrorsException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)] System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613 System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105 System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178 System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +54 System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) +232 System.Web.Compilation.BuildManager.CompileGlobalAsax() +51 System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +337 [HttpException (0x80004005): The specified module could not be found. (Exception from HRESULT: 0x8007007E)] System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58 System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512 System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +729 [HttpException (0x80004005): The specified module could not be found. (Exception from HRESULT: 0x8007007E)] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8897659 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85 System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +259 Does anyone know why this error appears and how to solve it?

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• Qt Plugins Not Working

  - by Austin

  I've created a custom widget plugin. The plugin integrates fine with Qt Creator but when I compile the program, I'm getting this error: "test.h: No such file or directory" Where test.h is the name of the custom widget. What am I doing wrong? This is the *.pro file of the application: TEMPLATE = app SOURCES += main.cpp \ mainwindow.cpp HEADERS += mainwindow.h FORMS += mainwindow.ui This is the *.pro file of the plugin: CONFIG += designer plugin debug_and_release TARGET = $$qtLibraryTarget(testplugin) TEMPLATE = lib HEADERS = testplugin.h SOURCES = testplugin.cpp RESOURCES = icons.qrc target.path = $$[QT_INSTALL_PLUGINS]/designer INSTALLS += target include(test.pri)

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• How to stop C#'s switch statement from generating the CIL switch instruction

  - by qochismo

  C#'s switch statement can compile to a CIL switch instruction, or if/else's, depending on the cases in the statement as mentioned here. Is there a way to force the compiler to always generate the if/else variant in a block of code?

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• Dotnet website - class in one file can't access class in a different file

  - by bmutch

  I've inherited a web site I'm editing in dotnet and it won't compile because the class in one file (say class1.vb) refers to a class in another file (say class2) (like Dim m_c As class2) , but the compiler says "Type Class2 is not defined". when I look in the object browswer the classes are listed separately (i.e. not all grouped under the same namespace) and appear as: Public Class Class1 Inherits System.Object Member of C:...\mywebsite\ Help!, thanks.

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