Practical J2EE Application Architecture


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No null return from load. Ans Simply connection pooling is a mechanism to re-use the existing connections. The pooling mechanism maintains a number of already created object connections and when there is a demand the mechanism directly use existing connection without creating a new one. Q 17 Define the Collection types in Hibernate? Ans One-to-many reference is defined as a collection. There are five main collection types associated with J2EE.


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They are. Ans A program interface that does not have any operations like database queries, complex business rules or any connection to the third-party application is called a thin client. Ans Spring is an open source application that reduces the complexity of enterprise application development.

Spring is based on an inversion of control or dependency injection design patterns. Q 21 What are the advantages in the use of spring for application development? Q 22 Discuss the benefit of Spring Framework? Ans Server side component that provides a powerful mechanism to create server side programs is called a servlet. There are servlets available with a design for various protocols. Servlet is also server and platform independent. Also, a servlet is a pure java object.

Practical J2EE Application Architecture by Nadir Gulzar - PDF Drive

Q 24 Describe the phases of servlet lifecycle? Ans There are 4 different types of tags associated with JSP. They are mentioned below. Ans A java bean that is associated with single or multiple action mapping is called action form. Action form objects are automatically populated at server end when data has been enter from the client from a user interface UI.

More especially SSL is a protocol that describes how algorithms to be used in encryption. The general structure of URL is as follows.

Top 40 Popular J2EE Interview Questions and Answers You Should Read

Ans URN stands for Uniform resource name. It is the unique identifier that identified an entity. But the information of where the entity is located is not available. Q 30 What are the phases of a servlet life cycle? Ans Following steps are associated with servlet life cycle. Q 31 Is that Servlet is pure java object or not? It is the server side components that executes in EJB container and encapsulates the business logic for the enterprise application.

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Q 33 What are the system services of EJB container? Ans EJB Container provides following system services. Q 34 What are the design principles for EJB?


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  • Q 35 What are the advantages of EJB components? Ans Two main types and subtypes of EJB are as follows. Q 37 What is the description for expression element? Ans The expressions that use to write dynamic content back to the client browser are called expression elements. This is attributed to the increased overhead of tracking and probing each and every object available in the Cache.

    In such scenarios, it is suggested to follow one of the options highlighted below:. Disable Caching only while profiling the application to find out any bottlenecks in the Java code and other layers such as the Database or external systems. Alternately, Reduce the Cache Size so that impact of object tracking and probing can be reduced this works in most cases since it is desirable to design any Cache that can be configurable in terms of its Size and Cache Invalidation Policies.

    I would like to share my experience with one of the industry-leading Rules Engine product that is hosted in a WebSphere Application Server instance which could not be started successfully after integrating a java profiler. With the profiler, the application server used to crash showing an issue in Java CompilerThread in libjvm. Without the profiler, no JVM crash is observed at any time.

    If enabled, try to disable and run with the profiler. Hence, it is suggested to reach out to the tool vendor or COTS vendor to get required support. It is recommended to check current file descriptors limit using ulimit —n and increase the number of file descriptors allowed on the system higher. It should be noted that this is not a mandatory change required whenever profiler is to be used with an application, however, it acts as one of the checklist items in case of unexpected errors while working with profiler-attached applications.

    In this paper, an attempt is made to de-brief the profiling process and highlight the practical issues in integrating profiling tools with Java applications. Please check the box if you want to proceed.


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      Check out this breakdown of five important terms to help To be a good tester, start at requirements and user expectations, then develop test cases that make certain those needs are met. The new GigaFox platforms enable users to create a pool of shareable mobile devices; remotely add, disable, reboot and unlock Coders can learn a lot from manufacturers, according to Gary Gruver, even though the products are distinctly different. This free Improving the employee experience is a must for modern organizations and their HR teams, but where should you start?

      Web Application Architecture - Load Balancing and Caching

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      Please create a username to comment. Five key terms in enterprise cloud applications you need to know Are you stumped by enterprise cloud applications or related technology? Search Software Quality How to approach test case design To be a good tester, start at requirements and user expectations, then develop test cases that make certain those needs are met. Mobile Labs adds GigaFox Red, Silver to mobile device cloud suite The new GigaFox platforms enable users to create a pool of shareable mobile devices; remotely add, disable, reboot and unlock How to prevent lingering software quality issues Coders can learn a lot from manufacturers, according to Gary Gruver, even though the products are distinctly different.

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      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture
      Practical J2EE Application Architecture Practical J2EE Application Architecture

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