David,
As you suspected, this is related to having a "flush" in your applet.
The simple solution is to extend your ServletOutputStream with a flush()
method that does nothing.
In the future, please ask usage questions on the struts-user list. This
list is intended for issues related to developing Struts itself.
Have fun,
Shai.
-----Original Message-----
From: David Anderson [mailto:[EMAIL PROTECTED]
Sent: Monday, September 08, 2003 08:36
To: [EMAIL PROTECTED]
Subject: PLEASE REPLY..response wrapping problem
as by Sun servlet 2.3 specs, I'm using httpServletResponseWrapper to
wrapp
response object, the technique didn't work and I didn't yet figured out
the
cause, I'm deploying my web app to JRUN (I don't know if JRUN4 container
is
related to the problem)
my question is :
is there something wrong in the following code in order to wrap response
object with struts/tiles ? , is this has to do with "flush=true" in
tiles:insert ? or is there any limitations for wrapping response in
Struts
framework? or is it a Tiles limitation ?
in my WEB.XML I wrote :
<filter>
<filter-name>My Response Wrapper</filter-name>
<filter-class>filters.WrapperFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>My Response Wrapper</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
the code in my filter is :
WrapperFilter.java
-------------------------
package filters;
import java.io.IOException;
import javax.servlet.Filter;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class WrapperFilter implements javax.servlet.Filter {
public void doFilter( javax.servlet.ServletRequest request,
javax.servlet.ServletResponse response,
javax.servlet.FilterChain chain )
throws IOException, ServletException {
ServletContext context = filterConfig.getServletContext();
HttpServletRequest req = (HttpServletRequest) request;
OutputStream out = response.getOutputStream();
out.write("<HR>PRE<HR>".getBytes());
GenericResponseWrapper wrapper = new
GenericResponseWrapper((HttpServletResponse) response);
chain.doFilter(request, wrapper);
out.write(wrapper.getData());
context.log(wrapper.getData().toString());
out.write("<HR>POST<HR>".getBytes());
out.close();
}
}
//----------------------------------------------------------------------
--------------------------------//
GenericResponseWrapper.java :
-------------------------------------------
package filters;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.ByteArrayOutputStream;
import java.io.PrintWriter;
public class GenericResponseWrapper extends HttpServletResponseWrapper {
private ByteArrayOutputStream output;
private int contentLength;
private String contentType;
public GenericResponseWrapper(HttpServletResponse response) {
super(response);
output = new ByteArrayOutputStream();
}
public byte[] getData() {
return output.toByteArray();
}
public ServletOutputStream getOutputStream() {
return new FilterServletOutputStream(output);
}
public void setContentLength(int length) {
this.contentLength = length;
super.setContentLength(length);
}
public int getContentLength() {
return contentLength;
}
public void setContentType(String type) {
this.contentType = type;
super.setContentType(type);
}
public String getContentType() {
return contentType;
}
public PrintWriter getWriter() {
return new PrintWriter(getOutputStream(), true);
}
}
========================================================
so when an action URL (http://localhost:8100/emgr/login.do) is called in
browser,the page shows NOTHING (empty page) , that login.do action is
doing
a simple process and than forwarding to tile defininition :
main.home.page ,
the logged error is :
jrun.servlet.io.ClosedIOException: Response has been closed
at
jrun.servlet.io.ClosedOutputStream.write(ClosedOutputStream.java:23)
at
java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
at
jrun.servlet.http.WebOutputStream.write(WebOutputStream.java:64)
at java.io.OutputStream.write(OutputStream.java:58)
at filters.WrapperFilter.doFilter(WrapperFilter.java:176)
at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)
at jrun.servlet.FilterChain.service(FilterChain.java:101)
.....
Also I noticed that the same filter is working fine if my action is
forwarding to a JSP instead of a tiles definition name
so instead of mapping the filter to *.do I mapped it to *.jsp :
<filter-mapping>
<filter-name>My Response Wrapper</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
that time the page shows correctly with the pre/post text embedded.
I'm confused, is it a STRUTS , TILES or JRUN problem ?
Regards.
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