Though, one thing you must remember that this facility is only available from Servlet 3. If you are running in Tomcat 6 or lower version, then you have to use the web.
One more thing to keep in mind is that ContextLoaderListener is optional. You can still create a Spring MVC web application without using this listener because all web-specific beans are loaded by DispatcherServlet itself.
Labels: spring framework , spring interview question , spring mvc. What is Spring MVC framework? Explain the request flow and its lifecycle in Spring MVC. What is the default scope of Spring MVC controllers? Sping MVC - pass model between controllers. How to configure DispatcherServlet without web. What does request. How to implement localization in Spring MVC applications?
How does Spring MVC provide validation support? Explain MultipartResolver in Spring framework? What is the front controller class of Spring MVC? How to start Spring MVC using spring boot? How do I configure DispatcherServlet without using web. Until specified, each DispatcherServlet creates own internal web application context. ContextLoaderListener creates the root application context and will be shared with child contexts created by all DispatcherServlet contexts.
You can have only one entry of this in web. The context of ContextLoaderListener contains beans that globally visible, like services, repositories, infrastructure beans, etc.
Generally, you will define all MVC related beans controller and views etc in DispatcherServlet context, and all cross-cutting beans such as security, transaction, services etc. Generally, this setup works fine because rarely you will need to access any MVC bean from child context into security related class from root context.
Mostly we use security beans on MVC classes, and they can access it with above setup. Subscribe to get new post notifications, industry updates, best practices, and much more. Directly into your inbox, for free. A blog about Java and its related technologies, the best practices, algorithms, interview questions, scripting languages, and Python. List is not a JavaBean according to the official description of a JavaBean , hence it cannot be validated directly using a JSR compliant validator. This is supported by two observations.
In addition to supporting instance validation, validation of graphs of object is also supported. The result of a graph validation is returned as a unified set of constraint violations. Consider the situation where bean X contains a field of type Y. By annotating field Y with the Valid annotation , the Validator will validate Y and its properties when X is validated. The exact type Z of the value contained in the field declared of type Y subclass, implementation is determined at runtime.
The constraint definitions of Z are used. This ensures proper polymorphic behavior for associations marked Valid. Collection-valued, array-valued and generally Iterable fields and properties may also be decorated with the Valid annotation. This causes the contents of the iterator to be validated. Any object implementing java. Iterable is supported.
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