We ran into this when we were demoing gridFS webdav demo on the developer conference using Gnome's 'Connect to server' function and then accessing via Nautilus. Looks like error in webdav 3rd party lib.

14:57:07,790 ERROR [WebDavServletBean] Exception: java.lang.NullPointerException
at net.sf.webdav.methods.DoPropfind.parseProperties(DoPropfind.java:256)
at net.sf.webdav.methods.DoPropfind.recursiveParseProperties(DoPropfind.java:212)
at net.sf.webdav.methods.DoPropfind.recursiveParseProperties(DoPropfind.java:227)
at net.sf.webdav.methods.DoPropfind.execute(DoPropfind.java:165)
at net.sf.webdav.WebDavServletBean.service(WebDavServletBean.java:128)
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.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
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:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)

Before happening, I noticed (maybe unrelated..)

14:42:31,269 INFO [STDOUT] LockedObject.removeLockedObjectOwner()
14:42:31,269 INFO [STDOUT] java.lang.ArrayIndexOutOfBoundsException: 1