Struts interview questions

Struts are being created as an open source project, which is started by the Apache Software Foundation. Struts structure depends on the Model View Controller (MVC) design developers utilize it for creating. There has been a lot of demand recently in the market for a Struts developer, which opens up many opportunities for anybody who is aiming to be one.

The difficulty level of the Struts Interview Questions may change for fresher and experienced one. While freshers may be asked basic questions, the experienced candidates might be asked distinctive level questions. But whether you are a fresher or experienced one, you ought to be prepared for the interview.

Getting through these Struts Interview Questions will, without doubt, give you an edge in this competitive time. These are the most broadly perceived and conspicuously asked Struts Interview Questions, which will help you crack and get through your interview and land you in your dream company.

#1 What are the major differences between HTML tags and Strut specific HTML Tags?

The major differences between the HTML tags and Strut specific HTML tags are:
  • The nature of HTML tags is Static through the nature of Struts specific HTML tags are dynamic.
  • HTML is a coordinated in Struts however Struts have their particular tag libraries.
  • The tags for HTML can’t be user-defined however whereas in case of struts the tags could be user-defined.

#2 What do you mean by a custom tag?

Custom Tags can be depicted as Java classes, which are written by designers, which can be utilized as a part of the JSP utilizing XML markup. Custom tags can be considered as a class, which goes about as view partner beans that can be put into utilization without scriptlets, which are Java code snippets mixed with JSP markup.

JSP pages are produced and changed by page creators and can’t interpret the scriptlets. This blurs the detachment of different duties to be performed in a project. Custom Tags along these lines help in taking care of this issue as they are XML based and likes any markup language and can be effectively comprehended by the page author.

#3 Briefly tell the two kinds of Form beans.

There are two different sorts of Form beans:
  • Request Scope: When the kind of Scope is requested, the values of the form beans are accessible with the present request.
  • Session Scope: When scope kind is a session, the values of the form beans are found for all of the requests in the ongoing session.

#4 What do you mean by action errors and what are the results they force?

Users of a web application may submit wrong information or no data at all. These errors must be gotten as near to the user interface as could be possible, rather than sitting tight for the center level or the database to tell segment can’t be inserted in the database because of expecting a non-null value.
Following are the outcomes of such programming practice:
  • Wastage of server time and assets. Like the request, this wastes time and assets also fail.
  • The negative effect on code quality as the probability of entering invalid information must be checked while utilizing or coding for business logic as they are the hardest codes of the framework and contain enough squares for if-else.

#5 What’s the utilization of Struts.xml configuration file?

Struts.xml file is one the major configuration records of Struts system which is utilized to characterize mapping between URL and action. At the point when the controller receives a client’s demand, the controller utilizes mapping data from this file to choose appropriate action class.

#6 What’s the utilization of resource bundle properties file in Struts Validation structure?

Resource bundle properties document is utilized to characterize specific error messages in key-value pairs for any conceivable errors that may occur in the code. This approach assists in keeps the code clean as the developer doesn’t have to dodge all error messages inside the code. Also Prepare: Frequently Asked Java Play interview Questions

#7 How can we work with error tags?

Working with error tags isn’t as complex as it looks. Error labels can be put in any place by including <html: errors/> into JSP. Not at all like others, error tags don’t have a body it also does not consist of any characteristics. The main function the error tag performs is to show the error in the place where the mistake tag is put utilizing three highlights – the header, the body and the footer.

#8 What do you mean by inner class and anonymous class?

Inner class: classes that are characterized by different classes.
  • The setting is a relationship performed between two different classes.
  • An inner class can get to private members and information.
  • Inner classes have two advantages:
  • Name control
  • Access control

Anonymous class: This class is a class characterized inside a technique without a name.

  • It is instantiated and pronounced in a similar strategy.
  • It doesn’t have explicit constructors.

#9 Why is Action Servlet a singleton in Struts?

In Struts system, action Servlet behaves like a controller, and this controller controls all of the requests made by clients. Action Servlet depends on singleton configuration pattern as just a single protest should be made for this controller class. Various threads are made later for every user request.

#10 How the flow of various requests happens in Struts Application?

Struts Applications utilize the MVC designs, and the flow of demand occurs in a prescribed way:
  • The user associated with the view after clicking on a connection or after that they submit present a form.
  • After the interaction happens, the demand is sent to the controller.
  • The controller is that person considered who is responsible for forwarding the demand for better activity.
  • Action class chooses the functions, which additionally work for the business logic that will be actualized.
  • The last process is the response, it happens after the model layer sends it, and the client sees it on the screen.

#11 What do you mean by Mode?

The Mode is utilized to ensure that the system is running in development mode or production mode by setting true or false. Mode is set to false production stage to diminish the effect of execution. As a matter, of course, it is “false.” It is utilized due to the accompanying reasons:
  • Asset Reloading: Resource package reload on each request
  • Modification: struts.xml can be modified without restarting or redeploying the application
  • Mistake Handling: The error happens in the application will be accounted for, as opposed to production mode.

#12 What are the two different types of validations that the Validator Framework supports?

With the purpose of Validation of form information, Validator system is utilized. The two different validations are:
  • Customer Side Validation
  • Server-Side Validation

#13 What is MVC Architecture ?

Model View Controller (MVC) is a design pattern used to perform changes in the application.
  • Model: Model is a term, which is referring to business or database. It stores the condition of the application. The model does not know the View and Controller segments.
  • View: View is referring to the Page Design Code. It must show the results of the client’s question. View modifies itself when any adjustments in the model happen.
  • Controller: Controller is alluding to navigational code. The controller will pick the best activity for every incoming request, produce the instance of that activity and execute that activity.

#14 What is the role of Action Class?

An Action class in the struts application is utilized to deal with the demand.
  • It acts as an interface or correspondence medium between the HTTP request for coming to it and business logic used to build up the application.
  • Action class comprises of Request Processor, which act as a controller. This controller will pick the best action for every incoming request, produce the instance of that activity and execute that activity.
  • This ought to be in a safer manner because Request Processor utilizes a similar instance for various numbers of requests at a particular time.

#15 What do you mean by the abstract package in Struts2, and what is its utilization?

An abstract package usually characterizes inheritable segments, for example, interceptor, different interceptor stacks, result types, etc. But that doesn’t contain any actions. The way we announce a package as abstract is through the package elements attribute as abstract and setting the figure to “true.” By default in case, the abstract attribute is not specified it is false. Struts-default.xml is a major example of an abstract package.
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