Hi,
I have some difficulties caching a wms layer
(http://sdi.geoportal.gov.pl/wms_orto/wmservice.aspx) which I reproject in
my Geoserver instance into local EPSG:2174.
The layer works in Layer Preview but not in GeoWebCache preview where I get
a white screen. I do not get any errors in the geoserver log apart from one
warning which is:

2012-03-16 13:44:21,324 INFO [config.XMLConfiguration] - Read GridSet
EPSG:2174
2012-03-16 13:44:21,324 WARN [grid.GridSetBroker] - Duplicate grid set
EPSG:2174, removing previous instance, but it may still be referenced by
layers.

The the grid set configuration in geowebcache.xml looks as follows:
  <gridSets>
    <gridSet>
    <name>EPSG:2174</name>
    <srs><number>2174</number></srs>
    <extent>
      <coords>
         <double>3431549.1194764557</double>  <--this is a bbox of the wms layer
from GetCapability document from my Geoserver-->
        <double>5347752.427261834</double>
        <double>4189965.550552365</double>
        <double>6104117.96819491</double>
      </coords>
    </extent>
        <metersPerUnit>1</metersPerUnit>
    <tileHeight>256</tileHeight>
    <tileWidth>256</tileWidth>
        </gridSet>
  </gridSets>

and layer.xml for the layer:
  <metadata>
    <entry key="GWC.metaTilingX">4</entry>
    <entry key="GWC.autoCacheStyles">true</entry>
    <entry key="GWC.metaTilingY">4</entry>
    <entry key="GWC.gutter">0</entry>
    <entry key="GWC.enabled">true</entry>
    <entry key="GWC.gridSets">EPSG:4326,EPSG:900913,EPSG:2174</entry>
    <entry key="GWC.cacheFormats">image/png,image/jpeg</entry>
  </metadata>

When I delete the GridSet config from geowebcache.xml, the warning message
dissapears, but layer does not apear. 
I'm running Geoserver nightly build (12-Mar-2012 05:02) on Tomcat 6 due to
jdk 1.7 usage which was not supported in last stable version.


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