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Java EE - Interview Questions and Answers for 'J2ee' - 46 question(s) found - Order By Rating | ||||
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This question was recently asked at 'Newgen technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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This question was recently asked at 'Sunovaa Tech'.This question is still unanswered. Can you please provide an answer. | ||||
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Like Discuss Correct / Improve  java vs j2ee  java  j2ee Asked in 1 Companies | ||||
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Ans. JSP files, media files and deployment descriptor ( web.xml ) | ||||
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Like Discuss Correct / Improve  j2ee  j2ee web module | ||||
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Ans. 1. Application Client Module 2. Web Module 3. EJB 4. Resource Adapter | ||||
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Ans. A cookie is a small piece of text stored on a user's computer by the browser for a specific domain. Commonly used for authentication, storing site preferences, and server session identification. | ||||
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Like Discuss Correct / Improve  cookie   javascript   web application   session management   browser   j2ee Asked in 16 Companies basic   frequent | ||||
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Ans. JMS Provides high-performance asynchronous messaging. It enables Java EE applications to communicate with non-Java systems on top of various transports. | ||||
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Ans. EJB Provides a mechanism that make easy for Java developers to use advanced features in their components, such as remote method invocation (RMI), object/ relational mapping (that is, saving Java objects to a relational database), and distributed transactions across multiple data sources. | ||||
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Like Discuss Correct / Improve  ejb   java   j2ee | ||||
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Ans. MVC2 | ||||
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Like Discuss Correct / Improve  struts2   struts   mvc2   j2ee | ||||
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Ans. An API is a kind of technical contract which defines functionality that two parties must provide: a service provider (often called an implementation) and an application. an API simply defines services that a service provider (i.e., the implementation) makes available to applications. | ||||
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Ans. URL is Uniform Resource Locator which is representation of HTTP address. | ||||
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Like Discuss Correct / Improve  j2ee   http   internet   url basic   rare | ||||
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Ans. 1) It is an Action based MVC based framework which has adopt mvc2. 2) Struts2 is a pull-MVC (or MVC2) framework where action takes the role of the model rather than the controller. The “pull†concepts means views ability to pull data from an action, rather than having a separate model object available. 3) The Model View-Controller pattern in Struts2 is implemented with five core components – actions, interceptors, value stack / OGNL, result types and results / view technologies. 4) XML configuration as well as Annotation option available. 5) POJO based action available so we can write test cases easily. 6) Integration with Spring, tiles and OGNL based expression langugae. 7) Theme based tag libraries integrated with struts tag as well as support of Ajax tag. 8) Can have various view options like jsp, velocity, freemarker etc. 9) We can embed plugin through which we can modify and extend framework features. | ||||
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Ans. HTTP or Hypertext Transfer Protocol is internet protocol for tranmission of hypertext ( text with meta data ) over internet. | ||||
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Like Discuss Correct / Improve  j2ee   http   internet  fidelity Asked in 2 Companies basic   frequent | ||||
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Ans. Suppose we want to visit a site for any information, information can be represented in different languages like English,German or may be other and their format for presentation can also differ from HTML to PDF or may be Plain text. In this case when an client makes an HTTP request to a server, client can also specify the media types here. Client can specify what it can accept back from host and on the basis of availability the host will return to the client. This is called content negotiation because client and server negotiated on the language and format of the content to be shared. | ||||
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Ans. Tomcat is a web server and a Servlet container. It is often used as an application server for web-based applications but does not include the complete suite of capabilities that a Java EE application server would supply. | ||||
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Ans. Web server. | ||||
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Like Discuss Correct / Improve  apache   web server   j2ee | ||||
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Ans. An asynchronous event is one that occurs at an unpredictable time outside the control of the program that the CPU is running. It is not "synchronized" with the program. | ||||
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Ans. Yes by making entries in web.xml | ||||
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Like Discuss Correct / Improve  j2ee   servlets   servelets   web application   java   web.xml   yes-no   architecture | ||||
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Ans. Within message.properties file. | ||||
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Ans. The config object is an instantiation of javax.servlet.ServletConfig and is a direct wrapper around the ServletConfig object for the generated servlet. This object allows the JSP programmer access to the Servlet or JSP engine initialization parameters such as the paths or file location. | ||||
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Like Discuss Correct / Improve  j2ee   servlet   jsp   servlet config   servletconfig   javax | ||||
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Ans. The pageContext object is an instance of a javax.servlet.jsp.PageContext object. The pageContext object is used to represent the entire JSP page. This object stores references to the request and response objects for each request. The application, config, session, and out objects are derived by accessing attributes of this object.The pageContext object also contains information about the directives issued to the JSP page, including the buffering information, the errorPageURL, and page scope. | ||||
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Ans. Struts 1 actions are singleton. So all threads operates on the single action object and hence makes it thread unsafe. Struts 2 actions are not singleton and a new action object copy is created each time a new action request is made and hence its thread safe. | ||||
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Like Discuss Correct / Improve  java   j2ee   mvc frameworks   struts   struts1   struts2   struts 1   struts 2   architecture | ||||
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Ans. J2EE or Java 2 Enterprise Edition is an environment for developing and deploying enterprise applications. The J2EE platform consists of J2EE components, services, Application Programming Interfaces (APIs) and protocols that provide the functionality for developing multi-tiered and distributed Web based applications. | ||||
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Ans. applets Client component like Client side Java codes. Web component like JSP, Servlet WAR Enterprise JavaBeans like Session beans, Entity beans, Message driven beans Enterprise application like WAR, JAR, EAR | ||||
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Ans. LDAP servers are typically used in J2EE applications to authenticate and authorise users. LDAP servers are hierarchical and are optimized for read access, so likely to be faster than database in providing read access. | ||||
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Ans. There are seven core modules in spring Spring MVC The Core container O/R mapping DAO Application context Aspect Oriented Programming or AOP Web module | ||||
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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity. | ||||
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Ans. The DispatcherServlet configured in web.xml file receives the request. The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller. Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet. The DispatcherServlet determines the view from the ModelAndView object. Then the DispatcherServlet passes the model object to the View. The View is rendered and the Dispatcher Servlet sends the output to the Servlet container. Finally Servlet Container sends the result back to the user. | ||||
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Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other. | ||||
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Ans. The default scope of bean is Singleton. | ||||
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Ans. The Spring Framework supports following five scopes - Singleton prototype request session global-session | ||||
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Very Frequently asked Spring question. | ||||
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Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using | ||||
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