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I3.1.0 and 3.1.1 wars are generated in the same folder.
Are there some blank space in your export folder? I remenber there was a similar problem when the export folder contains blank space.
I export the same job in tos3.1.0 and in tos3.1.1, the first one work in JBoss 5.0.0 the second one not work.
I open the war file and in the 3.1.1 version there's no WSDL and WSDD root directory.