Hi Igor!
Igor Vaynberg schrieb:
> looks like you are trying to output your xml too late in the game
> (wicket has already written something to the request).
I would rather guess it seems the other way around (and I will try to
explain the situation a bit better):
* If I use res.write( xmlout.outputString( doc ) );, I do not get the
exeption, but the response is not a xml file, but a "xml+html" document:
<?xml version="1.0" encoding="UTF-8"?>
<newsList xlmns="http:// ... </newsList>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Cp1252"/>
* If I use xmlout.output(doc, res.getOutputStream() );, I have an
exception (whole trace):
java.lang.IllegalStateException: getOutputStream() has already been
called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:599)
at
org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:195)
at wicket.protocol.http.WebResponse.write(WebResponse.java:315)
at
wicket.protocol.http.BufferedWebResponse.close(BufferedWebResponse.java:75)
at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:229)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
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
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.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:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
To me it looks as if I wrote my xml file and wicket wants to write the
html code just behind it (just as it does when i use Response.write() ),
but it cannot because I already called getOutputStream().
I create the xml file on runtime and do not have a empty one in the same
directory as suggested in the rss examples, but I see not reason that is
the problem.
> what triggers that code?
The constructor:
public RequestXML() {
WebRequest req = (WebRequest) getRequest();
WebResponse res = (WebResponse) getResponse();
parametersToResponse(req.getParameterMap(), res);
} catch (IOException e) {
e.printStackTrace();
}
}
I want to use that page to request data out of a Firefox extension.
I appreciate every idea.
Regards
Daniel
>
> -igor
>
>
> On 1/22/07, *Daniel Nüst* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Hi!
>
> I want to load an XML-file from a wicket page concerning the html page
> parameters with javascript. The javascript part (load and parse xml)
> works fine and also the generated xml file is okay.
>
> I just always get an
>
> java.lang.IllegalStateException: getOutputStream() has already been
> called for this response
> at
> org.apache.catalina.connector.Response.getWriter(Response.java:599)
> at
> org.apache.catalina.connector.ResponseFacade.getWriter
> (ResponseFacade.java:195)
> at wicket.protocol.http.WebResponse.write(WebResponse.java:315)
> at
>
> wicket.protocol.http.BufferedWebResponse.close(BufferedWebResponse.java:75)
> at wicket.protocol.http.WicketServlet.doGet
> (WicketServlet.java:229)
> [...]
>
>
> I did some research on this problem and found some workarounds for jsp.
> I also tried different combinations of Streams and Writers. Alsways that
> exception.
>
> The code:
>
> private void parametersToResponse(Map<String, String> params, Response
> res) throws IOException {
> res.setContentType("text/xml");
>
> logger.info("map: " + params);
>
> // test for illegal keys
> if ( containsIllegalKeys(params) || params.isEmpty() ) {
> logger.warn(howtoString);
> res.write(howtoString); //works!
> } else {
>
> // get news from database
> Collection<News> news = getNewsFromDB(params);
>
> // create xml document from news
> Document doc = createXML(news);
>
> // write xml file to stream
> XMLOutputter xmlout = new XMLOutputter();
> // res.write ( xmlout.outputString( doc )
> ); //does not work, res
> writes xml to beginning of html page
> xmlout.output(doc, res.getOutputStream() );
> //somehow dublicate call
> of getOutputStream !!!
> }
> }
>
> Another solution would be, not to use XMLOutputter, just
> response.write("..."), but I don't get a correct XML file but just my
> xml put before the html:
>
> <?xml version=" 1.0" encoding="UTF-8"?>
> <newsList [...]
> <html>
> <head>[...]
>
> Anybody an idea how to solve the former or the latter?
>
> Regards,
> Daniel
>
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