Re: [Wicket-user] Exception on WebResponse Outputstream
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:
* 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 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);
>
Re: [Wicket-user] Exception on WebResponse Outputstream
Thank you very much, Johan!
I wrote my own XMLRequestTarget around your code and now it works.
Daniel
Johan Compagner schrieb:
> you can't just write to something in the constructor (thats in the
> event/request phase)
>
> make a RequestTarget that outputs that what you want and set that
> request target as the response request target
> on the request cycle
>
> RequestCycle.get().setRequestTarget(new IRequestTarget()
> {
>void respond(RequestCycle requestCycle)
>{
> Response rep = requestCycle.getResponse();
> rep.write(yourxml);
> }
> });
>
> johan
>
> On 1/23/07, *Daniel Nüst* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> 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:
>
>
>
>
>
> * 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*
[Wicket-user] Exception on WebResponse Outputstream
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 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 = 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:
[...]
Anybody an idea how to solve the former or the latter?
Regards,
Daniel
-
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