One can register type mapping for (de)serializing object, but one can not register mime type name to qualified name and no way to register in utils.JavaUtils a mime-type to Java Object (see the method mimeToJava(...)).
Also, also in the file org.apache.axis.wsdl.toJava.Utils there is a mime-type "applications/xml". The Type "applications" does not exist (see RFC2045,RFC2046); the corrent Type is "application".
Lastly, the mime-subtype "octetstream" ("application/octetstream") appears in many places; it also does not exist, rather please change it to "application/octet-stream".
Richard