no response when adding a project

Using jetty:run, I get this exception adding a project:

2008-04-04 12:15:31,408 [btpool0-4] ERROR com.opensymphony.webwork.dispatcher.multipart.MultiPartRequest - org.apache.commons.fileupload.FileUploadBase$UnknownSizeException: the request was rejected because its size is unknown
org.apache.commons.fileupload.FileUploadBase$UnknownSizeException: the request was rejected because its size is unknown
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:305)
at com.opensymphony.webwork.dispatcher.multipart.JakartaMultiPartRequest.<init>(JakartaMultiPartRequest.java:51)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at com.opensymphony.webwork.dispatcher.multipart.MultiPartRequestWrapper.<init>(MultiPartRequestWrapper.java:100)
at com.opensymphony.webwork.dispatcher.DispatcherUtils.wrapRequest(DispatcherUtils.java:470)
at com.opensymphony.webwork.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:70)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:185)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:146)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:285)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:751)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:500)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:209)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:357)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:329)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
2008-04-04 12:15:31,421 [btpool0-4] ERROR com.opensymphony.webwork.interceptor.FileUploadInterceptor - the request was rejected because its size is unknown

The request fails after that, but the project has already been added