Hi Nicolas, I was not able to reproduce this using the latest release. Can you update the CXF version?
Otherwise you can check the Multipart testcases which were running successfully for 3.0.3 and adapt your code accordingly: https://github.com/apache/cxf/blob/cxf-3.0.3/systests/jaxrs/src/test/java/org/apache/cxf/systest/jaxrs/JAXRSMultipartTest.java Regards Dennis
