J2EE

Introduction to J2EE (2.x), its Architecture and Component Diagram: Java 2 Platform enterprise edition is an integrated set of individual APIs required for developing server side MULTI-TYRED, DISTRIBUTED, TRANSACTIONAL and SECURE applications…

Java Naming and Directory Interface (JNDI), JNDI Architecture: Naming Service? Is a service which allows us to store and retrieve simple objects with a unique name. It is just like one of the storage unit. Directory Service? Is an added service…

Java Security Model and its anatomy: Java Sandbox Model: Java has circumvented the virus or Trojan horse problems that plagued other models of software distributions. Java sandbox model is responsible for…

Introduction to Hibernate, Its Architecture: HIBERNATE is an ORM ( Object-Relational-Mapping) technology. It is an Open-Source and free technology , developed in SourceForge.net in JAVA. There have been a number of such ORM technologies,in recent past.. TopLink is one such tool…

Inversion of Control and Dependency Injection: Inversion of control is too broad term for the frameworks to claim that they are based on IoC. It depends on what control of the application are you inverting…

Acknowledgement modes in Java Message Server (JMS): There are two types – auto-acknowledge – dups-ok-acknowledge: auto-acknowledge: the acknowledge message from MDB to the JMS is sent as soon as the message is received. dups-ok-acknowledge…

Servlets and JSPs

where do the cookies get stored in the request object: Cookies are stored in the headers…

Is the exception implicit object available in all the JSP pages?: No, it is avaliable only in the error pages…

how do you navigate to error pages in JSP: In the page where exception might occur, add a page…

SQL

Transaction and ACID properties: A set of statements executed on a resource or resources applied with ACID properties is known as Transaction. Note: Here database is one resource but resource need not be only database. ACID Properties: …

What is the difference between sub query and co-related subquery: Sub Query: Here inner query gets executed first and based on the result of it the outer query is executed…

Implementation of relationships in sql: We have three types of relationships in SQL. one-to-one; one-to-many; many-to-many…

When should we use GROUP BY clause: When there is a need to aggregate/group values in a column based on some criteria in same/another column then we go for GROUP BY clause. Usage of Aggregate function on column: col_sales: …

frequent sql interview questions. Here some of the most common interview questions like where and having; distinct and group-by; union and union-all are …

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