Technical interview questions and answers are important for any J2EE Interview because companies want candidates who understand enterprise Java components, servlets, JSP, JDBC, MVC frameworks, and server-side development. J2EE is widely used for building scalable and secure enterprise applications, making it a key topic in Java-based interviews. Companies like TCS, Infosys, Wipro, Cognizant, and Accenture often include J2EE questions in their placement tests and technical rounds to evaluate backend development skills. This guide provides fully solved J2EE interview questions with clear explanations, helping freshers and job seekers build strong fundamentals. Preparing these questions will help you perform confidently in technical interviews, project discussions, and Java-based coding assessments.
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211. What is parser ?
A module that reads in XML data from an input source and breaks it into chunks so that your program knows when it is working with a tag, an attribute, or element data. A nonvalidating parser ensures that the XML data is well formed but does not verify that it is valid. See also validating parser.
212. What is passivation ?
The process of transferring an enterprise bean from memory to secondary storage. See activation.
213. What is persistence ?
The protocol for transferring the state of an entity bean between its instance variables and an underlying database.
214. What is persistent field ?
A virtual field of an entity bean that has container-managed persistence; it is stored in a database.
215. What is POA ?
Portable Object Adapter. A CORBA standard for building server-side applications that are portable across heterogeneous ORBs.
216. What is point-to-point messaging system ?
A messaging system built on the concept of message queues. Each message is addressed to a specific queue; clients extract messages from the queues established to hold their messages.
217. What is primary key ?
An object that uniquely identifies an entity bean within a home.
218. What is principal ?
The identity assigned to a user as a result of authentication.
219. What is privilege ?
A security attribute that does not have the property of uniqueness and that can be shared by many principals.
220. What is processing instruction ?
Information contained in an XML structure that is intended to be interpreted by a specific application.