Advanced Struts2 Interview Questions

Introduction to Struts 2 Interview Questions and Answers

Struts 2 is a web application framework for developing Java enterprise applications. Apache Software Foundation developed it. It was initially released in the year 2006. It is written in Java. It supports cross-platform. It is based on MVC architecture, which is referred to as a software design pattern for developing applications. The features of Struts 2 are simplified testability, Ajax support, Thread-safe, Template support etc.

If you are looking for a job related to Struts 2, you need to prepare for the 2023 Struts 2 Interview Questions. It is true that every interview is different as per the different job profiles. Here, we have prepared the important Struts 2 Interview Questions and Answers, which will help you get success in your interview.

In this 2023 Struts 2 Interview Questions article, we shall present the 10 most important and frequently used Struts 2 interview questions. These questions will help students build their concepts around Struts 2 and help them to crack the interview. These questions are divided into two parts are as follows:

Part 1 – Struts 2 Interview Questions (Basic)

This first part covers basic Struts 2 Interview Questions and Answers.

Answer: The MVC pattern in struts 2 has the components that are Actions, Interceptors, Value stack/ OGNL, Result/ Result types, and view technologies.

Answer: This is the basic Strut 2 Interview Questions asked in an interview. In Strut 1, the action class is not POJO and need to inherit the abstract class. The front controller is an action servlet. It has only JSP for the component view. In strut 1, a configuration file can be placed inside the WEB-INF directory. It uses the concept of Request Processor class while processing request. In Strut 1, action and models are separate.

In Strut 2, the action class is POJO, and there is no need to inherit any class or implement any interface. It has JSP, free-market etc., for the view component. In strut 2, the function controller is Struts Prepare and Execute filter. In this, a configuration file must be named as struts.xml and placed inside the classes directory. It uses the concept of Interceptors while processing the request. In strut 2, action and models are combined within the action class.

Answer: The life cycle of a request in strut is:

  • The user sends a request to the server for requesting for some pages.
  • The filter dispatcher looks at the request and then determines appropriate action.
  • Configured interceptor functionalities apply such as validation and file upload etc.
  • The selected action is executed to perform the requested operation.
  • After that, again configured the interceptors that are applied to do any post-processing, if required.
  • Finally, the result is prepared by a view and returns the result to the user.
  • Let us move to the next Struts 2 Interview Questions.

    Answer: The interceptors are based on struts 2. It executes for all the request qualifies for a front controller that is servlet filter and can be configured to execute additional interceptor for particular action execution. Methods in interceptor can be configured whether to execute or not by means of exclude methods or include methods.

    The filters are based on servlet specification. Executes on the pattern matches on request and not configurable method calls.

    Answer: Interceptors help in achieving the struts 2 better frameworks as follows:

  • It can be used anywhere in desktop applications with small or no change to existing web applications. For struts, actions are now POJO, and it is easier to unit test, and interceptor helped in achieving this.
  • Most of the trivial work is made easier to achieve. An example is an automatic form population.
  • The UI is easier and validated in the form of themes and a well-known DOJO framework.
  • There are smart configuration and defaults.
  • It can be used for next-generation RESTFUL services.
  • It is highly pluggable, integrates other technologies like spring, hibernates etc., at ease.
  • 5) What are the two different validations that the Validator Framework supports?

    For the purpose of Validation of form data, the Validator framework is used. The two different validations are: 1. Client-Side Validation 2. Server-Side Validation

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