Container


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Container

Container provides runtime environment for Java2ee (j2ee) applications. A web container is a predefined application provided by a server, its takes care of Servlet and JSP.

In console based java applications a class which contains main method acts as a container for other classes.

Example

class Vachile
{
void speed()
{
System.out.println("Speed limit is 40 km/hr");
}
}
class Mainclass
{
public static void main(String args[])
{
Vachile v=new Vachile();
v.speed();
}
}

Output

Speed limit is 40 km/hr

Explanation: Here Mainclass is providing run-time support for vehicle class so main class is called a container.

In GUI based applications a frame acts as a container for other awt components like button, textfield etc.

Operations of Container.

  • Life Cycle Management
  • Communication Support
  • Multithreaded support
  • Security etc.

1. Life cycle management: Servlet and JSP are dynamic resources of java based web application. The Servlet or JSP will run on a server and at server side. A container will take care about life and death of a Servlet or JSP.
A container will instantiate, Initialize, Service and destroy of a Servlet or JSP. It means life cycle will be managed by a container.

2. Communication Support: If Servlet or JSP wants to communicate with server than its need some communication logic like socket programming. Designing communication logic is increase the burden on programmers, but container act as a mediator between a server and a Servlet or JSP and provides communication between them.

3. Multithreading: A container creates a thread for each request, maintains the thread and finally destroy it whenever its work is finished.

4. Security: A programmer is not required to write security code in a Servlet/JSP. A container will automatically provide security for a Servlet/JSP.


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