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Reload to refresh your session. You signed out in another tab or window. Add "Affects" field to issue template. Jan 18, Polish URL Cleanup. Mar 22, Upgrade to Gradle 5. Jun 29, Fix typo. Jun 17, Migrate JUnit 4 assertions to AssertJ. May 23, Your application isn't coupled to it. Inversion of Control states: "The application controls the framework, not the framework controls the application". Mahozad 2, 7 7 gold badges 15 15 silver badges 42 42 bronze badges.
Whats the difference between having to change a line of code and a line of XML?
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The effort and maintenance hell is exactly the same, or even worse, since the external xml files arguably adds complexity? Sorry but I just dont get it, I dont see any benefit at all. Please fill me in if Im missing something.
Without dependency injection DI can be used with annotations or with XML you can't properly test, because you can't mock the dependencies. It's a massive overhead to maintain. Therefor EJB introduced the concept of annotations for injection points. Those are much simpler and a default instance will be injected for unit tests this can be changed once. This worked so well that Spring has now copied this approach. Or, you know, use a factory static method. Change the factory's return type, and now all of the classes that use that return value are changed.
Presto Spring is now no longer needed There is lot more to Spring that can be read up in good books like "Pro Spring". Priyank Priyank 8, 17 17 gold badges 67 67 silver badges bronze badges. Spring contains an MVC framework. But it's a lot, lot more than that. Without wishing to nitpick too much, WebMVC is part of the core spring distro. Webflow, RCP et al are not.
Alireza Fattahi Alireza Fattahi I'd actually like to see the mvc, data, jpa and other parts of Spring have an option to not use Spring's core DI, but put Dagger in the heart of Spring instead. So what is Spring for?
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Ash Ash 7 7 silver badges 29 29 bronze badges. Frustration aside, I am wondering about your arguments. I don't know any programming tool that you can't use to produce bad design. What you aim at is that using frameworks you can make bad code do lots of stuff. That's universally true and not specific to Spring. Otherwise what's the point? Don't you think competent developers can make great use of what Spring has to offer - being particular in which tools of the framework they use?
At least I am quite certain that you don't imply that no Spring developer has ever heard of extending classes. The further reading is hilarious, though.
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Furthermore, your example works because the view needs only one injected service UserLister , but what if it needs several services, not shared between the different BaseView 's children? There is fortunately no multiple inheritance in Java. EdouardBerthe Fair point. My answer was not an attempt to disregard DI, it just points out the example shown in the accepted answer is not the greatest; the scenario you are proposing would most likely work better. The point I was really trying to make is not that you don't need DI, but rather you don't need an entire framework to do it.
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Johan Johan 3 3 silver badges 6 6 bronze badges. Spring is three things. Spring handles Dependency Injection and I recommend you read Martin Fowler's excellent introduction on dependency injection. The second thing Spring does is wrap excellent Java libraries in a very elegant way to use in your applications.
They figure since you are using Spring for the first two, maybe you can just use it for everything your web app needs.
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Controller classes are also dead simple to test thanks in part to dependency injection Spring integration with Hibernate, which does a good job of simplifying work with that ORM solution for most cases Using Spring for a web app enables you to use your Domain Objects at all levels of the application - the same classes that are mapped using Hibernate are the classes you use as "form beans. Spring form tags make it easier to create forms without much hassle.
Spring MVC is one of the many parts of Spring, and is a web framework making use of the general features of Spring, like dependency injection. Spring is really a great tool. I wasn't talking about Spring MVC, just the base framework. Spring Dependency Injection approach There the another way to wire the classes up alongside using a XML file: the annotations.
Autowired private UserLister userLister; Use the Bean annotation on a method used to get the bean implementation to inject. Nikolas Nikolas You cannot use the Bean annotation on class level. Must be one of Component , Service , Repository etc. Rest is correct. You should maybe also point out that Autowiring the Interface in this way will only work if there is only 1 candidate class in classpath suitable for injection, otherwise Spring application error. StefanoL: Yes, you are right. I wonder people ignored my mistake. Thanks for the comment. Basil Bourque k 36 36 gold badges silver badges bronze badges.
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Sumit Pokhrel Sumit Pokhrel 5 5 silver badges 9 9 bronze badges. But even in case of Spring, we still would be defining beans. Can I correct? Was alternative to horrible EJB Spring is a lightweight and flexible framework compare to J2EE. Spring container act as a inversion of control. Spring uses AOP i. Tiered architectures: Separation of concerns and Reusable layers and Easy maintenance. Premraj Premraj The Spring Framework is very lightweight with respect to its size and functionality.
This is an important part of the Spring Framework. Aspect-Oriented Programming is used for separating cross-cutting concerns for example, logging, security, etc. In the coming articles, you will be learning about this in greater detail. Also, it is not tied to the J2EE environment and is used with containerless environments. The Spring framework designs and manages the lifecycle and configurations of application objects. This feature of the Spring Framework allows you to develop loosely coupled applications. Therefore, the unit testing of these loosely coupled applications becomes easier.
This also allows the developer to swap out some of the modules according to its need. It just tries to integrate them with its framework, which provides a solution to greater problems. Several versions have been released after its first. As of now, Spring 5.
The Spring framework codebase is based on the code level from Java 8. This code level provides readability using inferred generics, and the conditional support for Java 8 is directly provided in the code. Recent servers, such as Jetty 9.
The compatibility of JDK 9 has been added at runtime, as well as for the build and test suit. The package mock.