JSP - Why main() is not written in servlets programs?

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Why main() is not written in servlets programs?

Total Answers and Comments: 7

Last Update: August 06, 2008 Asked by: m.pavankumar

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Submitted by: mullangi13

Servlet will execute in webcontainer only. The life cycle of servlet is

init(ServletConfig cg)
service(ServletRequest,ServletResponse)
destroy()

So our webcontainer will call these methods only to execute our servlet. So even you defined main() method in your servlet there is no wrong but there is no use why because it never execute throughout the servlet life cycle.

Rgds,
Mullangi

Above answer was rated as good by the following members:
ramana123123

August 13, 2007 03:29:04

askvenki

Member Since: July 2007 Contribution: 18

RE: Why main() is not written in servlets programs?

In normal Java Application we have to invoke Java Interpter, it will start through main.
Servlets have live cycle
Client Request->Container->Invokes the HTTP method automatically

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November 17, 2007 15:57:02

ramesh.sukka

RE: Why main() is not written in servlets programs?

As per the specs of Java, the only standalone program should implement/have the methods main() so that interpreter will understand the starting point of execution. If you consider Servlets it is not standalone program so id doesnâ€™t require main.

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November 17, 2007 15:59:13

ramesh.sukka

Member Since: November 2007 Contribution: 7

RE: Why main() is not written in servlets programs?

As per the java specs , the only standalone program should implement/have the methods main() so that interpreter will understand the starting point of execution. If you consider Servlets it is not standalone program so id doesn’t require main.

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March 10, 2008 04:02:22

bharaniprasanth

Member Since: February 2008 Contribution: 46

RE: Why main() is not written in servlets programs?

why does applets don't have main...same way I think

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0 1

Overall Rating: -1

June 11, 2008 04:03:00

pradeepkmr18

Member Since: June 2008 Contribution: 25

RE: Why main() is not written in servlets programs?

Servlets are server side programmes everything will be done by the webcontainer.

i agree with them as they said standalone java applications will have main method

but servlets are not standalone java applications .

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July 23, 2008 10:12:15

mullangi13

Member Since: March 2007 Contribution: 9

RE: Why main() is not written in servlets programs?

Servlet will execute in webcontainer only. The life cycle of servlet is

init(ServletConfig cg)
service(ServletRequest,ServletResponse)
destroy()

So our webcontainer will call these methods only to execute our servlet. So even you defined main() method in your servlet there is no wrong but there is no use why because it never execute throughout the servlet life cycle.

Rgds,
Mullangi

Is this answer useful? Yes | No

1 0

Overall Rating: +1

August 06, 2008 03:21:36

vinayroz

Member Since: August 2008 Contribution: 3

RE: Why main() is not written in servlets programs?

Simple java programs are stand alone application and in this caseÂ we have to specify the starting point of execution for interpreter but servlets are server side tech and based on client request. Whenever client send a request, webcontainer calls servlet withÂ its own life cycle method. So there is no need of having main() method in servlets.

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