61⟩ What is binding (XML)?
Generating the code needed to process a well-defined portion of XML data.
J2EE
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“J2EE Interview Questions and Answers will guide us now that Java Platform, Enterprise Edition or Java EE is a widely used platform for server programming in the Java programming language. The Java platform (Enterprise Edition) differs from the Java Standard Edition Platform (Java SE) in that it adds libraries which provide functionality to deploy fault-tolerant, distributed, multi-tier Java software, so learn J2EE with the help of this J2EE Interview Questions with Answers guide”
112 J2EE Questions And Answers
62⟩ What is build file?
The XML file that contains one or more asant targets. A target is a set of tasks you want to be executed. When starting asant, you can select which targets you want to have executed. When no target is given, the project's default target is executed.
63⟩ What is caller?
Same as caller principal.
64⟩ What is binding (JavaServer Faces technology)?
Wiring UI components to back-end data sources such as backing bean properties.
65⟩ What is business method?
A method of an enterprise bean that implements the business logic or rules of an application.
66⟩ What is connector?
A standard extension mechanism for containers that provides connectivity to enterprise information systems. A connector is specific to an enterprise information system and consists of a resource adapter and application development tools for enterprise information system connectivity. The resource adapter is plugged in to a container through its support for system-level contracts defined in the Connector architecture.
67⟩ What is component contract?
The contract between a J2EE component and its container. The contract includes life-cycle management of the component, a context interface that the instance uses to obtain various information and services from its container, and a list of services that every container must provide for its components.
68⟩ What is application component provider?
A vendor that provides the Java classes that implement components' methods, JSP page definitions, and any required deployment descriptors.
69⟩ What is callback methods?
Component methods called by the container to notify the component of important events in its life cycle.
70⟩ What is cascade delete?
A deletion that triggers another deletion. A cascade delete can be specified for an entity bean that has container-managed persistence.
71⟩ What is container-managed persistence?
The mechanism whereby data transfer between an entity bean's variables and a resource manager is managed by the entity bean's container.
72⟩ What is certificate authority?
A trusted organization that issues public key certificates and provides identification to the bearer.
73⟩ What is basic authentication?
An authentication mechanism in which a Web server authenticates an entity via a user name and password obtained using the Web application's built-in authentication mechanism.
74⟩ What is caller principal?
The principal that identifies the invoker of the enterprise bean method.
75⟩ What are the differences between Ear, Jar and War files? Under what circumstances should we use each one?
There are no structural differences between the files; they are all archived using zip-jar compression. However, they are intended for different purposes.
--Jar files (files with a .jar extension) are intended to hold generic libraries of Java classes, resources, auxiliary files, etc.
--War files (files with a .war extension) are intended to contain complete Web applications. In this context, a Web application is defined as a single group of files, classes, resources, .jar files that can be packaged and accessed as one servlet context.
--Ear files (files with a .ear extension) are intended to contain complete enterprise applications. In this context, an enterprise application is defined as a collection of .jar files, resources, classes, and multiple Web applications.
Each type of file (.jar, .war, .ear) is processed uniquely by application servers, servlet containers, EJB containers, etc.
76⟩ What is application assembler?
A person who combines J2EE components and modules into deployable application units.
77⟩ What is bean-managed transaction?
A transaction whose boundaries are defined by an enterprise bean.
78⟩ What is application client container?
A container that supports application client components.
79⟩ What does application client module contain?
The application client module contains:
--class files,
--an application client deployment descriptor.
Application client modules are packaged as JAR files with a .jar extension.
80⟩ What is archiving?
The process of saving the state of an object and restoring it.
