A simple doubt in the usage of GET & POST

[Shanmugam Karthikeyan]

package com.baboon.servletmodel;
2.public class TestParamServlet extends HttpServlet {
3. protected void doPost(HttpServletRequest req,
4. HttpServletResponse resp)
5. throws ServletException, IOException
6. {
7. resp.getWriter().println(req.getParameter("param"));
8. }
9.}

What would be the output in your browser when you invoke the servlet-code with the following URL:
http://localhost/servlet/com.baboon.servletmodel.TestParamServlet?Param=10

1. Code compiles, the output is a blank page with the value 10 printed out.
2. Code compiles, a blank page is displayed.
3. Code compiles, the output is a blank page with null printed out.
4. Code failed compilation, exception IOException is not caught.
5. Code compiles, stacktrace is printed out in browser.


The answer given is No.2., but when i tried a similiar example iam not getting this response.I am actually getting the following error

HTTP Status 405 - HTTP method GET is not supported by this URL

Can anyone let me know the reason for this behaviour.

[Vishnu Prakash]

When ever you click a link or type in a url the method that gets invoked in your servlet is GET and NOT POST. Since you didn't override the GET method you see the standard error message.

[Shanmugam Karthikeyan]

Hi,

Thanks for your reply .... so does it means that the answer given is wrong.

[Rajesh Vijaya]

I created a TestParamSerlvet.java as given in the question and placed in my /Context/WEB-INF/classes folder and also placed the class TestParamServlet in that.

when i tried the same url(context changed) i get the HTTP 404 ....

can we invoke the sevlet directly from the browser without defining in the DD..I dont think so....

correct me if i'm wrong....the question itslef is somewhat vague...or ami getting wrong....can anyone explain.....

[Rajesh Vijaya]

i got the doubt cleared myself...i need to configure in the DD...

and karthikeyan ...vat are u getting is correct....

answer no 2 is wrong...as a matter of fact all the answers are wrong....

[Albin Joseph]

Since it is a get method , the container will call the doGet() method of the servlet. But it is not overriden in your servlet, the default implementation will get executed and the default implementation for doGet() is 'HTTP 405 message' ( at least in BEA Weblogic).

[Rahim Vindhani]

Originally posted by Albin Joseph:
Since it is a get method , the container will call the doGet() method of the servlet. But it is not overriden in your servlet, the default implementation will get executed and the default implementation for doGet() is 'HTTP 405 message' ( at least in BEA Weblogic).

Yes exactly albin...the default implementaion of the doGet() will be called by the container.

[satheesh krishnaswamy]

Hi All,

I think the proper way of using this is,

override doGet() method and inside that call doPost().That will work out really.

Guys,correct me if I am wrong.

Can anyone suggest me some links for SCWCD Exam.
Thanks a lot

[Richard Green]

can we invoke the sevlet directly from the browser without defining in the DD..I dont think so....

in tomcat, u can just drop ur servlets in tomcat\webapps\ROOT folder and access it as http://localhost/yourServletName

[Rajesh Vijaya]

Hi mike ...

I places the test servlet TestParamServlet in ,my Tomcat/webapps/ROOT/ folder

and tried invoking

by http://localhost:8080/TestParamSevlet but i'm getting 404 Error

and i even tried placing the class in Tomcat/webapps/ROOT/web-inf/classes/


but still the same....

[rehans oberoi]

override doGet() method
and inside that call doPost().
That will work out really.


ranchers what is teh need of this
overriding doget and then call do post

[Rishi M]

It means for such questions correct answer will be
HTTP 405 - Resource not allowed

and not the one marked in HFSJ that blank page will be dispplayed.
please correct me if i am wrong.

[Christophe Verré]

Yes. Since doGet is not overriden in the servlet, HttpServlet.doGet will be called by the container.

As far as Tomcat is concerned, the default behaviour is sending a 405(Method not allowed) error in HTTP 1.1, and a 400(Bad Request) error in HTTP 1.0.
[ December 06, 2005: Message edited by: Satou kurinosuke ]

[Shanmugam Karthikeyan]

Hi guys,

Thanks for all of your response.The example which i have given in my post has a proper configuration in the web.xml, sorry for not specifying this information in the starting itself.

As it is stated in order to prevent these types of error i think we can call a doPost() inside a doGet().

I got this question from www.j2eecerfication.com site.May be i will mail the author so that others won't get confused by this question.