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Computer Interview Questions Answers

J2EE Interview Questions Answers

Question - 21 : - What does web module contain?

Answer - 21 : - The web module contains: --JSP files, --class files for servlets, --GIF and HTML files, and --a Web deployment descriptor. Web modules are packaged as JAR files with a .war (Web ARchive) extension.

Question - 22 : - What is binding (JavaServer Faces technology) ?  

Answer - 22 : - Wiring UI components to back-end data sources such as backing bean properties.  

Question - 23 : - What is "application client module" ?

Answer - 23 : - A software unit that consists of one or more classes and an application client deployment descriptor.

Question - 24 : - What is entity reference ?

Answer - 24 : - A reference to an entity that is substituted for the reference when the XML document is parsed. It can reference a predefined entity such as < or reference one that is defined in the DTD. In the XML data, the reference could be to an entity that is defined in the local subset of the DTD or to an external XML file (an external entity). The DTD can also carve out a segment of DTD specifications and give it a name so that it can be reused (included) at multiple points in the DTD by defining a parameter entity.

Question - 25 : - What is bean-managed persistence ?  

Answer - 25 : - The mechanism whereby data transfer between an entity bean's variables and a resource manager is managed by the entity bean.  

Question - 26 : - What is certificate authority ?  

Answer - 26 : - A trusted organization that issues public key certificates and provides identification to the bearer.  

Question - 27 : - What is enterprise bean provider ?

Answer - 27 : - An application developer who produces enterprise bean classes, remote and Interview Questions - Home interfaces, and deployment descriptor files, and packages them in an EJB JAR file.

Question - 28 : - What is entity bean ?

Answer - 28 : - An enterprise bean that represents persistent data maintained in a database. An entity bean can manage its own persistence or can delegate this function to its container. An entity bean is identified by a primary key. If the container in which an entity bean is hosted crashes, the entity bean, its primary key, and any remote references survive the crash.

Question - 29 : - What is J2EE component ?

Answer - 29 : - A self-contained functional software unit supported by a container and configurable at deployment time. The J2EE specification defines the following J2EE components: Application clients and applets are components that run on the client. Java servlet and JavaServer Pages (JSP) technology components are Web components that run on the server. Enterprise JavaBeans (EJB) components (enterprise beans) are business components that run on the server. J2EE components are written in the Java programming language and are compiled in the same way as any program in the language. The difference between J2EE components and "standard" Java classes is that J2EE components are assembled into a J2EE application, verified to be well formed and in compliance with the J2EE specification, and deployed to production, where they are run and managed by the J2EE server or client container.

Question - 30 : - What is enterprise information system resource ?

Answer - 30 : - An entity that provides enterprise information system-specific functionality to its clients. Examples are a record or set of records in a database system, a business object in an enterprise resource planning system, and a transaction program in a transaction processing system.

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