Flushing response and then forwarding not working as expected

Balraj Momi

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posted 13 years ago

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HI
I tried this example to flush PrintWriter/ServletOutputStream and then forwarding it to another jsp. I was expecting it to throws IllegalStageException, but it worked fine in both cases. Could anyone please tell me what am I be doing wrong here.
Thanks in advance

public class TesterServlet extends HttpServlet{
	public void doGet(HttpServletRequest request, 
				HttpServletResponse response) throws ServletException, IOException{
		response.setContentType("text/html");

//Use init parameter for URL
		String forwardURL = super.getServletConfig().getInitParameter("forwardURL");
		System.out.println("Forward URL "+forwardURL);
		PrintWriter out = response.getWriter();
		out.write("");
		out.flush();
	/*	byte []b = new byte[1024];
		b = "OutStream Flush".getBytes();
		ServletOutputStream outStream = response.getOutputStream();
		outStream.write(b);
		outStream.flush();*/
		//Request Dispatcher dispatching simple way
		request.getRequestDispatcher(forwardURL).forward(request, response);

//Request Dispatcher dispatching with query string parameters
	}
}

>web.xml<
<web-app>
	<servlet>
		<servlet-name>TestServlet</servlet-name>
		<servlet-class>com.balraj.scwcd.exam.servlet.TesterServlet</servlet-class>
		<init-param>
			<param-name>forwardURL</param-name>
			<param-value>welcome.jsp</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>TestServlet</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
</web-app>

>welcome.jsp<
<HTML><BODY>Hi There!!!!!</BODY></HTML>

Regards
Balraj Kumar
SCJP 5 95%
SCWCD 82%
Preparing for SCBCD

Frits Walraven

Creator of Enthuware JWS+ V6

Posts: 3411

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posted 13 years ago

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Hi Balraj,

You should get an IllegalStateException! What server are you using? What is the URL that you are submitting?

Regards,
Frits

Balraj Momi

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posted 13 years ago

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Now I have no idea what made it to work now

. I can see IllegalStateException after I put try-catch block.
Earlier It was blindly going to forwarded url.

But anyway thanks much for looking into it.

Regards
Balraj Kumar
SCJP 5 95%
SCWCD 82%
Preparing for SCBCD