response.isCommitted()???

[Poonam Agarwal]

Consider the following code: (Enthuware)

public void doGet(HttpServletRequest req, HttpServlerResponse res)
{

	PrintWriter out = res.getWriter();
	out.println("Unable to find resource.");
	//1
	response.sendError(404);
}

Which of the following lines, when inserted at //1, will ensure that an IllegalStateException is NOT thrown?

1. res.clear();
2. res.empty();
3. res.remove();
[b]4. if(!res.isCommitted())[/b]
5. if( res.getStatus() != res.COMMITTED)

the correct answer is 4.

refering to srvelet API
public boolean isCommitted()Returns a boolean indicating if the response has been committed. A committed response has already had its status code and headers written.

what are the status_code and headers for committed responce???

please help

Thanks
Poonam

[Ankit Garg]

Look every response has a status code (like 200 for OK etc) headers. So if headers are already sent to the client, then the response is said to have been committed. Headers are committed before the response content i.e. the HTML that we write. You can set the status code using reponse.setStatus() and set headers using response.addHeader and response.setHeader...

[Poonam Agarwal]

Ok, thanks ankit