J2EE Interview Questions

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Top J2EE Interview question and answers

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1) what's J2EE? J2EE suggests that Java two
Enterprise Edition. The practicality of J2EE is
developing multitier web-based applications .The
J2EE platform is consists of a collection of
services, application programming interfaces
(APIs), and protocols.
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• 2) What area unit the four elements of J2EE
  application?
• Application purchasers elements.
• Servlet and JSP technology area unit net
  elements.
• Business elements (JavaBeans).
• Resource adapter elements

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• 3) What square measure sorts of J2EE clients?
• Applets
• Application purchasers
• Java net Start-enabled purchasers, by Java net
  begin technology.
• Wireless purchasers, supported MIDP technology.

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4) What square measure thought of as an internet
component? Java Servlet and Java Server Pages
technology elements square measure net elements.
Servlets square measure Java programming language
that dynamically receive requests and create
responses. JSP pages execute as servlets however
permit a a lot of natural approach to making
static content.
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5) what's JSF? Java Server Faces (JSF) could be
a programmed (UI) coming up with framework for
Java net applications. JSF give a collection of
reusable UI elements, normal for net
applications.JSF relies on MVC style pattern. It
mechanically saves the shape information to
server and populates the shape date once show at
consumer aspect.
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6) outline Hash table Hash Table is simply like
Hash Map, Collection having key(Unique),value
pairs. Hash table could be a assortment
Synchronized object .It doesn't enable duplicate
values however it permits null values.
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7) what's Hibernate? Hibernate may be a open
supply object-relational mapping and question
service. In hibernate we will write HQL rather
than SQL that save developers to pay longer on
writing the native SQL. Hibernate has a lot of
powerful association, inheritance, polymorphism,
composition, and collections. it's a gorgeous
approach for dogging into info victimization the
java objects. Hibernate additionally permits you
to precise queries victimization java-based
criteria .
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8 ) what's the limitation of hibernate? Slower
in execution the queries than queries are used
directly. Only search language support for
composite keys. No shared references to price
sorts.
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• 9) What are the advantage of hibernate.
•  Hibernate is portable mean database independent,
  Vendor independence.
•   Standard ORM also supports JPA
•   Mapping of Domain object to relational
  database.
•   Hibernate is better then plain JDBC.
•   JPA provider in JPA based applications.

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