[Geoserver-users] geowebcache - seeding - java.lang.IllegalStateException: getWriter() has already been called for this response

Paul_McCullough · August 13, 2008, 7:06pm

All,

I am trying without success to seed a layer in geowebcache.

Here is the url I am using to do the seeding:
http://127.0.0.1:8080/geowebcache/seed?layers=map&start=12&stop=14

When I enter this url into firefox, I see this...

Seeding map from level 12 to level 14 for format image/png and bounds Min X:
-2.003750834E7 Min Y: -2.003750834E7 Max X: 2.003750834E7 Max Y:
2.003750834E7
Level 12, ~672400 metatile(s) [16777216 tile(s)]
0,

and then it stops.

When use curl I see this:

[pmccullough@anonymised.com ~]$ curl
"http://10.1.15.73:8080/geowebcache/seed?layers=map&start=12&stop=14"
<html><body><table><tr><td>Seeding map from level 12 to level 14 for format
image/png and bounds Min X: -2.003750834E7 Min Y: -2.003750834E7 Max X:
2.003750834E7 Max Y: 2.003750834E7</td></tr><tr><td>Level 12, ~672400
metatile(s) [16777216 tile(s)]</td></tr><tr><td>0, [pmccullough@anonymised.com ~]$

and I am suddenly back at the command prompt.

Here is the stack trace in the tomcat logfile:
    INFO: Initializing Spring FrameworkServlet 'geowebcache'
    Aug 13, 2008 8:57:05 AM org.apache.catalina.core.StandardWrapperValve
invoke
    SEVERE: Servlet.service() for servlet geowebcache threw exception
    java.lang.IllegalStateException: getWriter() has already been called for
this response
      at
org.apache.catalina.connector.Response.getOutputStream(Response.java:579)
      at
org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:183)
      at
org.geowebcache.GeoWebCacheDispatcher.writeError(GeoWebCacheDispatcher.java:381)
      at
org.geowebcache.GeoWebCacheDispatcher.handleRequestInternal(GeoWebCacheDispatcher.java:156)
      at
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
      at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
      at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:874)
      at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:808)
      at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:523)
      at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
      at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
      at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
      at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
      at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
      at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
      at java.lang.Thread.run(Unknown Source)

I see no output to the geoserver log file.

Here is the layer definition in geowebcache:
    #Type, determines configuration parser
    layername=map
    type=wms

    # Backend
    wmsurl=http://localhost:8080/geoserver/wms
    wmslayers=layer-group_map

    # Tile profile
    mimetypes=image/png
    palette=sfmaps
    srs=EPSG:900913
    grid=-20037508.34,-20037508.34,20037508.34,20037508.34
    bbox=-20037508.34,-20037508.34,20037508.34,20037508.34

    width=256
    height=256
    version=1.1.0
    errormime=application/vnd.ogc.se_inimage
    tiled=false
    transparent=true
    metatiling=5x5
    debugheaders=true

    # Cache backend settings
    cacheprefix=c:\\geowebcache\\map

This config works properly using openlayers; images get cached, etc.
I am careful to delete c:\\geowebcache\\ ech time through.
I am careful to restart tomcat.

My environment is
- geowebcache 0.8.4
- geoserver 1.6.3
- java 1.6.0_05
- tomcat 6.0.16
- windows xp sp2

Thanks,
Paul

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Arne_Kepp · August 14, 2008, 8:46pm

Hi Paul,

sorry I didn't have time to test and respond before now. I understand the error message, I'm surprised it doesn't show up when I run it in Jetty (I guess the Servlet implementations differ? or there is some other library difference).

Anyway, I've made you a version that just prints plusses justing OutputStream instead of Writer, I don't think they get sent to the client though, so it'll probably act completely silent. http://geo.openplans.org/~ak/geowebcache.war

A new (proper, queued and multithreaded) seeding mechanism has been written as part of a Google Summer of Code project and we will try to get that out and make a nice JavaScript GUI for it in the next two weeks

Please note that seeding level 12 alone can easily take 23 days, and if the HTTP connection drops you probably have to start over. So I would recommend running it using curl on the same machine as the server.

-Arne

Paul McCullough wrote:

All,

I am trying without success to seed a layer in geowebcache.

Here is the url I am using to do the seeding:
    http://127.0.0.1:8080/geowebcache/seed?layers=map&start=12&stop=14

When I enter this url into firefox, I see this...

Seeding map from level 12 to level 14 for format image/png and bounds Min X:
-2.003750834E7 Min Y: -2.003750834E7 Max X: 2.003750834E7 Max Y:
2.003750834E7
Level 12, ~672400 metatile(s) [16777216 tile(s)]
0,

and then it stops.

When use curl I see this:

[pmccullough@anonymised.com ~]$ curl
"http://10.1.15.73:8080/geowebcache/seed?layers=map&start=12&stop=14"
<html><body><table><tr><td>Seeding map from level 12 to level 14 for format
image/png and bounds Min X: -2.003750834E7 Min Y: -2.003750834E7 Max X:
2.003750834E7 Max Y: 2.003750834E7</td></tr><tr><td>Level 12, ~672400
metatile(s) [16777216 tile(s)]</td></tr><tr><td>0, [pmccullough@anonymised.com ~]$

and I am suddenly back at the command prompt.

Here is the stack trace in the tomcat logfile:
    INFO: Initializing Spring FrameworkServlet 'geowebcache'
    Aug 13, 2008 8:57:05 AM org.apache.catalina.core.StandardWrapperValve
invoke
    SEVERE: Servlet.service() for servlet geowebcache threw exception
    java.lang.IllegalStateException: getWriter() has already been called for
this response
      at
org.apache.catalina.connector.Response.getOutputStream(Response.java:579)
      at
org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:183)
      at
org.geowebcache.GeoWebCacheDispatcher.writeError(GeoWebCacheDispatcher.java:381)
      at
org.geowebcache.GeoWebCacheDispatcher.handleRequestInternal(GeoWebCacheDispatcher.java:156)
      at
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
      at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
      at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:874)
      at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:808)
      at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:523)
      at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
      at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
      at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
      at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
      at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
      at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
      at java.lang.Thread.run(Unknown Source)

I see no output to the geoserver log file.
    Here is the layer definition in geowebcache:
    #Type, determines configuration parser
    layername=map
    type=wms
        # Backend
    wmsurl=http://localhost:8080/geoserver/wms
    wmslayers=layer-group_map
        # Tile profile
    mimetypes=image/png
    palette=sfmaps
    srs=EPSG:900913
    grid=-20037508.34,-20037508.34,20037508.34,20037508.34
    bbox=-20037508.34,-20037508.34,20037508.34,20037508.34
        width=256
    height=256
    version=1.1.0
    errormime=application/vnd.ogc.se_inimage
    tiled=false
    transparent=true
    metatiling=5x5
    debugheaders=true
        # Cache backend settings
    cacheprefix=c:\\geowebcache\\map

This config works properly using openlayers; images get cached, etc.
I am careful to delete c:\\geowebcache\\ ech time through.
I am careful to restart tomcat.

My environment is
- geowebcache 0.8.4
- geoserver 1.6.3
- java 1.6.0_05
- tomcat 6.0.16
- windows xp sp2

Thanks,
Paul