Skip to main content

What are JEE Containers? What are their different types?

Containers are the interface between a component and the low-level, platform-specific functionality that supports the component. Before it can be executed, a web, enterprise bean, or application client component must be assembled into a Java EE module and deployed into its container.

The assembly process involves specifying container settings for each component in the Java EE application and for the Java EE application itself. Container settings customize the underlying support provided by the Java EE server, including such services as security, transaction management, Java Naming and Directory Interface (JNDI) API lookups, and remote connectivity. Here are some of the highlights.

  • The Java EE security model lets you configure a web component or enterprise bean so that system resources are accessed only by authorized users.
  • The Java EE transaction model lets you specify relationships among methods that make up a single transaction so that all methods in one transaction are treated as a single unit.
  • JNDI lookup services provide a unified interface to multiple naming and directory services in the enterprise so that application components can access these services.
  • The Java EE remote connectivity model manages low-level communications between clients and enterprise beans. After an enterprise bean is created, a client invokes methods on it as if it were in the same virtual machine.
Because the Java EE architecture provides configurable services, components within the same application can behave differently based on where they are deployed. For example, an enterprise bean can have security settings that allow it a certain level of access to database data in one production environment and another level of database access in another production environment.

The server and containers are as follows:
  • Java EE server: The runtime portion of a Java EE product. A Java EE server provides EJB and web containers.
  • EJB container: Manages the execution of enterprise beans for Java EE applications. Enterprise beans and their container run on the Java EE server.
  • Web container: Manages the execution of web pages, servlets, and some EJB components for Java EE applications. Web components and their container run on the Java EE server.
  • Application client container: Manages the execution of application client components. Application clients and their container run on the client.
  • Applet container: Manages the execution of applets. Consists of a web browser and a Java Plug-in running on the client together.

Comments

Popular posts from this blog

Who is Peter Lynch and what is his philosophy in equity market investment? 25 Golden Rules of the most successful Fund Manager.

Peter Lynch (born January 19, 1944) is an American investor, mutual fund manager, and philanthropist. As the manager of the Magellan Fund at Fidelity Investments between 1977 and 1990, Lynch averaged a 29.2% annual return, consistently more than doubling the S&P 500 stock market index and making it the best-performing mutual fund in the world. During his 13 year tenure, assets under management increased from $18 million to $14 billion. He also co-authored a number of books and papers on investing and coined a number of well known mantras of modern individual investing strategies, such as Invest in what you know and ten bagger. Lynch is consistently described as a "legend" by the financial media for his performance record. Base on his career I have compiled his investing rules here. 25 GOLDEN RULES by @Peter Lynch 1: Nobody can predict interest rates, the future direction of the economy or the stock market. Dismiss all such forecasts & concentrate on what's actual

What is wrong with HDFC securities? Are they doing some fraudulent activities or just causing issues with their platform as usually it don't work during market hours?

I have opened a DEMAT account with HDFC Securities in 2019 as HDFC group is well known for the customer services and I also hold a salary account with HDFC Bank, DEMAT account with the following conditions/offers as expressed by the executive. Trading Account Opening Charges (One Time) :  ₹999 (At that time it offered on lower price, I forget the exact price) Trading Annual Maintenance Charges AMC (Yearly Fee) : ₹0 Demat Account Opening Charges (One Time) : ₹0 Demat Account Annual Maintenance Charges AMC (Yearly Fee) : ₹750, nil if portfolio value below ₹2 lacs. Equity Delivery : 0.50% Equity Intraday : 0.05% Equity Futures : 0.05% Equity Options : ₹100 per lot or 1% of the premium (whichever is higher) Currency Futures : ₹23 per contract Currency Options : ₹20 per contract Commodity Futures : 0.02% for Intraday / 0.025% for positional Commodity Options : 0.02% for Intraday / 0.025% for positional It was going good but after 2-3 months I got to know that there are som

What is version checking in Hibernate ?

Version checking used in hibernate when more then one thread trying to access same data. For example : User A edit the row of the TABLE for update ( In the User Interface changing data This is user thinking time) and in the same time User B edit the same record for update and click the update. Then User A click the Update and update done. Change made by user B is gone. In hibernate you can prevent slate object updation using version checking. Check the version of the row when you are updating the row. Get the version of the row when you are fetching the row of the TABLE for update. On the time of updation just fetch the version number and match with your version number (on the time of fetching).