The following code works for me (java 6, JBoss 5.0.0CR1, jbossws Core 3.02): @WebService(...) @EndpointConfig(...) @SOAPBinding(style = SOAPBinding.Style.DOCUMENT, parameterStyle = SOAPBinding.ParameterStyle.WRAPPED) @MTOM(enabled = true) @BindingType(value = "http://schemas.xmlsoap.org/wsdl/soap/http?mtom=true") public class StatementService { ... @WebMethod(operationName = "GetStatementContent") public StatementListDO getStatementContent(@WebParam(name = "FileName") final String fileName) { StatementListDO sldo = new StatementListDO(); ... ArrayList statements = new ArrayList(1); final File f7z = new File(fileName); StatementDO statement = new StatementDO(); statement.setStmtContent(new DataHandler(new FileDataSource(f7z))); statements.add(statement); sldo.setStatements(statements); return sldo; } ... } @XmlType @XmlRootElement(name = "StatementList") public class StatementListDO implements Serializable { private ArrayList statements; @XmlElement(name = "Statements", nillable = true, required = false) public final ArrayList getStatements() { return this.statements; } public final void setStatements(ArrayList statements) { this.statements = statements; } } @XmlType public final class StatementDO implements Serializable { ... private DataHandler stmtContent; @XmlElement(name = "StatementContent", required = false) @XmlMimeType("application/zip") public final DataHandler getStmtContent() { return this.stmtContent; } public final void setStmtContent(DataHandler stmtContent) { this.stmtContent = stmtContent; } ... } View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170135#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...