when uploading large or many files at once, it aborts the upload at 10M with the stack trace:

Caused by: java.io.IOException: UT000020: Connection terminated as request was larger than 10485760
at io.undertow.conduits.FixedLengthStreamSourceConduit.checkMaxSize(FixedLengthStreamSourceConduit.java:166) [undertow-core-1.0.0.Beta30.jar:1.0.0.Beta30]
at io.undertow.conduits.FixedLengthStreamSourceConduit.read(FixedLengthStreamSourceConduit.java:224) [undertow-core-1.0.0.Beta30.jar:1.0.0.Beta30]
at org.xnio.conduits.ConduitStreamSourceChannel.read(ConduitStreamSourceChannel.java:127)
at io.undertow.channels.DetachableStreamSourceChannel.read(DetachableStreamSourceChannel.java:180) [undertow-core-1.0.0.Beta30.jar:1.0.0.Beta30]
at io.undertow.server.HttpServerExchange$ReadDispatchChannel.read(HttpServerExchange.java:1776) [undertow-core-1.0.0.Beta30.jar:1.0.0.Beta30]
at org.xnio.channels.Channels.readBlocking(Channels.java:294)
at io.undertow.servlet.spec.ServletInputStreamImpl.readIntoBuffer(ServletInputStreamImpl.java:138) [undertow-servlet-1.0.0.Beta30.jar:1.0.0.Beta30]
at io.undertow.servlet.spec.ServletInputStreamImpl.read(ServletInputStreamImpl.java:117) [undertow-servlet-1.0.0.Beta30.jar:1.0.0.Beta30]
at org.apache.wicket.util.upload.MultipartFormInputStream$ItemInputStream.makeAvailable(MultipartFormInputStream.java:1093) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.MultipartFormInputStream$ItemInputStream.read(MultipartFormInputStream.java:976) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.io.Streams.copy(Streams.java:104) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.io.Streams.copy(Streams.java:76) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.MultipartFormInputStream.readBodyData(MultipartFormInputStream.java:596) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.MultipartFormInputStream.discardBodyData(MultipartFormInputStream.java:625) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.MultipartFormInputStream.skipPreamble(MultipartFormInputStream.java:645) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:899) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:873) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.FileUploadBase.getItemIterator(FileUploadBase.java:271) [wicket-util-6.13.0.jar:6.13.0]
at org.apache.wicket.util.upload.FileUploadBase.parseRequest(FileUploadBase.java:291) [wicket-util-6.13.0.jar:6.13.0]

it was reported in mailing lists but i couldn't find a bug for it: http://list-archives.org/2013/04/08/jboss-as7-dev-lists-jboss-org/undertow-error/f/3753630395