I've come across the following exception since I believe upgrading to 4.0.1. The page has a basic upload component for documents. It looks like some classloader issue.
org.apache.hivemind.ApplicationRuntimeException: Unable to construct service tapestry.multipart.ServletMultipartDecoder: Could not load class org.apache.tapestry.multipart.MultipartDecoderImpl from WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: [EMAIL PROTECTED] : org/apache/commons/fileupload/servlet/ServletFileUpload org.apache.hivemind.impl.servicemodel.ThreadedServiceModel.constructInstanceForCurrentThread(ThreadedServiceModel.java:175) org.apache.hivemind.impl.servicemodel.ThreadedServiceModel.getServiceImplementationForCurrentThread(ThreadedServiceModel.java:146) $ServletMultipartDecoder_10a93ed226f._service($ServletMultipartDecoder_10a93ed226f.java) $ServletMultipartDecoder_10a93ed226f.cleanup($ServletMultipartDecoder_10a93ed226f.java) $ServletMultipartDecoder_10a93ed2270.cleanup($ServletMultipartDecoder_10a93ed2270.java) org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:57) $ServletRequestServicerFilter_10a93ed22ad.service($ServletRequestServicerFilter_10a93ed22ad.java) $ServletRequestServicer_10a93ed22b5.service($ServletRequestServicer_10a93ed22b5.java) org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53) $ServletRequestServicerFilter_10a93ed22b1.service($ServletRequestServicerFilter_10a93ed22b1.java) $ServletRequestServicer_10a93ed22b5.service($ServletRequestServicer_10a93ed22b5.java) $ServletRequestServicer_10a93ed22a7.service($ServletRequestServicer_10a93ed22a7.java) org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:123) org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:168) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) javax.servlet.http.HttpServlet.service(HttpServlet.java:810) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) -- ~chris