Solr 3.5 has the same problem.  Luke had a similar issue: 
http://code.google.com/p/luke/issues/detail?id=40.

Any ideas?

Thanks,
David

From: David Chandek-Stark [mailto:[email protected]]
Sent: Tuesday, May 01, 2012 2:53 PM
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] GSearch/Solr compatibility

Sorry, just saw in GSearch 2.4 release notes compatible with Solr 3.5 - will 
try that.

--David

From: David Chandek-Stark 
[mailto:[email protected]]<mailto:[mailto:[email protected]]>
Sent: Tuesday, May 01, 2012 1:56 PM
To: 
[email protected]<mailto:[email protected]>
Subject: [fcrepo-user] GSearch/Solr compatibility

Hi,

I have GSearch 2.4.1 indexing a Fedora 3.5 repository.  It works fine with 
Lucene, but I have issues with Solr 3.6 (which does work independently of 
GSearch).  I can downgrade Solr, but would like to know which version exactly, 
if that's the problem.

Thanks,
David

FWIW, the GSearch Solr error I can't work around with Solr 3.6 is:

java.lang.ClassCastException: org.apache.lucene.document.NumericField cannot be 
cast to org.apache.lucene.document.Field
        at dk.defxws.fgssolr.Statement.executeQuery(Statement.java:161)
        at dk.defxws.fgssolr.OperationsImpl.gfindObjects(OperationsImpl.java:95)
        at 
dk.defxws.fedoragsearch.server.RESTImpl.gfindObjects(RESTImpl.java:243)
        at dk.defxws.fedoragsearch.server.RESTImpl.doGet(RESTImpl.java:125)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.fcrepo.server.security.servletfilters.FilterSetup.doFilter(FilterSetup.java:247)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.fcrepo.server.security.servletfilters.FilterSetup.doFilter(FilterSetup.java:247)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.fcrepo.server.security.servletfilters.FilterSetup.doFilter(FilterSetup.java:247)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.fcrepo.server.security.servletfilters.FilterSetup.doFilter(FilterSetup.java:247)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.fcrepo.server.security.servletfilters.FilterSetup.doFilter(FilterSetup.java:247)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        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:191)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:662)
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