dependency-injection

How can I inject a property value into a Spring Bean which was configured using annotations?

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I have a bunch of Spring beans which are picked up from the classpath via annotations, e.g. @Repository(“personDao”) public class PersonDaoImpl extends AbstractDaoImpl implements PersonDao { // Implementation omitted } In the Spring XML file, there’s a PropertyPlaceholderConfigurer defined: <bean id=”propertyConfigurer” class=”org.springframework.beans.factory.config.PropertyPlaceholderConfigurer”> <property name=”location” value=”/WEB-INF/app.properties” /> </bean> I want to inject one of the properties … Read more

How do the major C# DI/IoC frameworks compare? [closed]

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Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago. Improve this question At the risk of stepping into holy war territory, What are the strengths and weaknesses … Read more

How to avoid Dependency Injection constructor madness?

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I find that my constructors are starting to look like this: public MyClass(Container con, SomeClass1 obj1, SomeClass2, obj2…. ) with ever increasing parameter list. Since “Container” is my dependency injection container, why can’t I just do this: public MyClass(Container con) for every class? What are the downsides? If I do this, it feels like I’m … Read more

What are the downsides to using Dependency Injection? [closed]

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As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for … Read more

What’s the difference between the Dependency Injection and Service Locator patterns?

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Both patterns seem like an implementation of the principle of inversion of control. That is, that an object should not know how to construct its dependencies. Dependency Injection (DI) seems to use a constructor or setter to “inject” it’s dependencies. Example of using Constructor Injection: //Foo Needs an IBar public class Foo { private IBar … Read more

ASP.NET Core Dependency Injection error: Unable to resolve service for type while attempting to activate

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I created an .NET Core MVC application and use Dependency Injection and Repository Pattern to inject a repository to my controller. However, I am getting an error: InvalidOperationException: Unable to resolve service for type ‘WebApplication1.Data.BloggerRepository’ while attempting to activate ‘WebApplication1.Controllers.BlogController’. Model (Blog.cs) namespace WebApplication1.Models { public class Blog { public int BlogId { get; set; … Read more

Why is IoC / DI not common in Python?

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In Java IoC / DI is a very common practice which is extensively used in web applications, nearly all available frameworks and Java EE. On the other hand, there are also lots of big Python web applications, but beside of Zope (which I’ve heard should be really horrible to code) IoC doesn’t seem to be … Read more

Which .NET Dependency Injection frameworks are worth looking into? [closed]

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As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for … Read more