Take it to your heart: Most companies look forward to candidates brimming with innovative problem solving skills, not to mention a fine cognitive approach to the subject at hand. Keeping that in mind here are some of the most commonly asked JSP interview questions that you should go through before your next interview.
1. Speaking of JSP, what do you understand by the implicit objects?
So far as implicit objects are concerned, they are essentially core Java objects at the disposal of the developers. Particularly, the reason why they are called implicit is that these are furnished by the JSP author and accessed through the help of standard variables.
2. What do you understand by the term JSP directives?
JSP directives are nothing but fundamental messages from the JSP page to the JSP container in order to control the processing of a page. Generally speaking, JSP directives are essentially meant for such purposes as a class declaration and method implementation among other things. However, it is important to keep in mind that JSP directives do not trot out any output on the client side.
3. Can you briefly highlight the vital points of the whole JSP cycle?
Firstly, there is translation, compilation and loading the class. After loading the class, you instantiate the class followed by the jsplnit () invocation and the _jspservice() invocation. In the end, the cycle is rounded off by the jspDestroy() invocation. These constitute the core elements of the JSP cycle.
4. You mentioned the destroy method. What is its function?
Evidently, it is used to destroy the page. Apart from that, you may also understand it by comparing it with a fundamental cleanup operation such as shutting a database connection. In principle, additionally, the destroy method is peculiarly close to the destroy method used by servlets. So far as the cleanup operation is concerned, it can be overridden by the concerned page author in order to carry out the targeted task.
5. Can you highlight the functionality of the include function in brief?
So far as the include function is concerned, it is chiefly used for the purpose of inclusion of a response from a servlet or a JSP page to the current page. However, it is important not to confuse with the include directive which includes a resource at translation time, unlike the include function which does it at request processing time.
6. What do you understand by the JSP standard actions?
These chiefly constitute the overall runtime behavior of a JSP page. In other words, they are basically used in accordance with the needs and necessities of the concerned JSP author such as for the purpose of inclusion and instantiation among other things.
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7. Can you describe the functionality of the JSP scripting elements?
To put it simply, the scripting elements are essentially meant to include Java codes into the servlet that will be generated from the current JSP page. Indeed, there are several forms of the scripting elements for achieving the same. Each form is unique in its own way and may be invoked in accordance with need.
8. Speaking of JSP scripting elements, what do you understand by JSP declarations?
As the name hints, the JSP declarations are chiefly utilized to declare methods and class variables on a JSP page. At the same time, it is significant to keep in mind the exceptions to the application of the same. Declarations are not included in the service method when a JSP is translated to a servlet.
9. Can you tell us how could you disable a script?
By fixing the scripting invalid element of the descriptor deployment to the true condition, you can induce disability of a script. As is well known, the validation can either be true or false.
10. What do you understand by the term scriptlet?
So far as a scriptlet is concerned, it may be defined as one that contains fundamental Java code that is implemented every time a JSP is called. As we mentioned before, in the case of the translation of the JSP into a servlet, it is essentially the scriptlet that goes into the so called service method in order to bring about the same. It is essentially executed at the request processing time by the container.
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