What are the different types of restrictions on EJB?

What are the different types of restrictions on EJB?

EJB Restrictions

• Run-time distribution. Enterprise bean instances may be distributed; that is, running in separate Java virtual machines or on separate machines.
• Security. Many of the restrictions are imposed to maintain the integrity of the enterprise bean security model.
• Container control.
• Server model.

Is threading possible in EJB?

It is not possible to have threading in EJB because Container maintains and controls the processing in EJB. EJB is not built to control the system or implementation works so container itself manage the thread.

Which statements about message driven beans MDBS are true?

A message driven bean is a type of enterprise bean which is invoked by EJB container when it receives a message from queue or topic. Message driven bean is a stateless bean and is used to do task asynchronously. Q 9 – Which of the following is true about message driven bean? A – Message driven bean is a stateless bean.

What is J2EE development?

J2EE is a platform-independent, Java-centric environment from Sun for developing, building and deploying Web-based enterprise applications online. The J2EE platform consists of a set of services, APIs, and protocols that provide the functionality for developing multitiered, Web-based applications.

What is EJB and why it is used?

EJB is a server-side software component that encapsulates business logic of an application. An EJB web container provides a runtime environment for web related software components, including computer security, Java servlet lifecycle management, transaction processing, and other web services.

What is the purpose of message driven beans explain the various circumstances under which a message driven bean should be used?

When to Use Message-Driven Beans Session beans allow you to send JMS messages and to receive them synchronously, but not asynchronously. To avoid tying up server resources, do not to use blocking synchronous receives in a server-side component, and in general JMS messages should not be sent or received synchronously.

What is allowed in message driven bean?

A message-driven bean is an enterprise bean that allows Java EE applications to process messages asynchronously. The messages can be sent by any Java EE component (an application client, another enterprise bean, or a web component) or by a JMS application or system that does not use Java EE technology.

What is J2EE and it purposes?

The purpose of the J2EE platform is to develop multi-tier, web-based applications using a series of protocols and application programming interfaces (APIs). J2EE provides the enterprise level with a Java platform that is fast, safe and secure, improving on the J2SE (Java 2 Platform, Standard Edition).

Where do we use J2EE?

It is mainly used to develop web applications by taking help from HTML pages or specific applet in java and defining java-based application. The main concern technologies of the J2EE platform are Servlet, and JSP (Java Server Pages), both of which are very much useful normally in an enterprise web application.

What is J2EE platform?

J2EE stands for Java 2 Platform, Enterprise Edition. J2EE is the standard platform for developing applications in the enterprise and is designed for enterprise applications that run on servers. J2EE provides APIs that let developers create workflows and make use of resources such as databases or web services.

What is allowed in message-driven bean?

What is J2EE?

Short for Java 2 Platform Enterprise Edition. J2EE is a platform -independent, Java -centric environment from Sun for developing, building and deploying Web-based enterprise applications online. The J2EE platform consists of a set of services, APIs, and protocols that provide the functionality for developing multitiered, Web-based applications.

What is the best programming language for J2EE platform?

Java programming language is always one of the best programming languages for developing a web-based application in a J2EE platform. For a long time, Java has been developed from running one small applet to a web application; now, it came to its enterprise version.

What should I do after learning J2EE?

J2EE is a huge technology and always upgraded itself for better features. After learning J2EE, a developer should need to concentrate more on some specific framework like Spring core, Spring MVC, Spring Boot or Struts 1, 2, etc.

What are the constraints of J2ME?

Constraints included limited processing power, battery limitation, small display etc. Also, the J2ME apps help in using web compression technologies, which in turn, reduce network usage, and hence cheap internet accessibility. J2ME uses many libraries and API’s of J2SE, as well as, many of it’s own.