That seems to imply it is impossible to apply a servlet filter which
adds response headers (for caching). I mean, I have absolutely no way of
knowing ahead of time which Wicket page I am filtering is going to
redirect or not.
I believe Eelco originally recommended caching headers should be set
using servlet filters. If this is no longer viable, we'd have to add
support directly into Wicket core, no?
Gili
Johan Compagner wrote:
with a redirect nothing should be written to the stream i believe.
Gili wrote:
In my AddResponseHeaders filter (it's in the stack-trace) my code
reads:
HttpServletResponse response = (HttpServletResponse) servletResponse;
// set the provided HTTP response parameters
for (Enumeration e=config.getInitParameterNames();
e.hasMoreElements();)
{
String headerName = (String) e.nextElement();
response.addHeader(headerName,
config.getInitParameter(headerName));
}
chain.doFilter(servletRequest, servletResponse);
so really all I am doing is setting response headers, why would
this cause problems for redirect? Is this normal?
Gili
Johan Compagner wrote:
that is strange somehow there is already written something to the
stream when we want to redirect
I added some more info (the redirect url) so that you can see which
urls are causing these problems.
johan
Gili wrote:
I just noticed this in my tomcat logs. Has anyone else
experienced the same thing? (This is rc3)
23:42:21,171 ERROR WebResponse:148 - Unable to redirect. HTTP
Response has already been committed.
23:42:21,171 ERROR [Webpage]:260 - Servlet.service() for servlet
Webpage threw exception
java.lang.IllegalStateException
at
org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:423)
at wicket.protocol.http.WebResponse.redirect(WebResponse.java:156)
at
wicket.protocol.http.BufferedWebResponse.close(BufferedWebResponse.java:74)
at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:226)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
com.be.desktopbeautifier.web.filter.AddResponseHeaders.doFilter(AddResponseHeaders.java:44)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:526)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
This does not occur on a regular basis but if it's a bug, it
would be nice to be able to track it down and fix it.
Gili
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