Display portlet preview - JPDK

I try to implement the preview mode of the portlet, but get the following error message in the source of the lower left frame of the Add Portlet window:
<!-- Error: The listener returned the following Message: &ltFONT color="#FF0000" face=&quotarial,helvetica">&ltB&gt500</B></FONT> &ltB&gtInternal Server Error</B> -->
In my provider.xml I have the following entries:
<showPreview>true</showPreview>
<renderer class="oracle.portal.provider.v1.RenderManager">
<contentType>text/html</contentType>
<showPage class="mapportlet.MapShowRenderer" />
<editPage class="mapportlet.MapEditRenderer" />
<helpPage class="mapportlet.MapHelpRenderer" />
<aboutPage class="mapportlet.MapAboutRenderer" />
<previewPage class="mapportlet.MapPreviewRenderer" />
</renderer>
Thanks,
Peter

My jserv.log:
[18/05/2001 10:26:24:677] (EMERGENCY) ajp12: can not connect to host 127.0.0.1:8
008
[18/05/2001 10:26:24:677] (EMERGENCY) ajp12: connection fail
[18/05/2001 10:26:24:677] (ERROR) an error returned handling request via protocol "ajpv12"
[18/05/2001 10:26:26:067 PDT] page/oracle.webdb.page.ParallelServlet: init
[18/05/2001 10:26:26:093 PDT] page/JNI: Cache is enabled.
[18/05/2001 10:26:26:118 PDT] page/Starting a pool of 25 handlers.
[18/05/2001 10:26:28:538 PDT] map1/init
I'm afraid the syntax of the provider.xml is incorrect... Is there any documentation available on all the show modes... I do miss the default edit mode as well...
The error message is not very specific... :-(
Thanks,
Peter

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    INFO: [ OE_CUSTOMER_LOCATION ] sql exec time: 281ms, total time loading 46 features: 409ms.Edited by: Wolfgang on 20.07.2009 11:42

    Hi Wolfgang,
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