прикрепить файл через MIME

            objData.getFiles().forEach( ( field, value ) ->{
                try {
                 
                    Stream stream = session.createStream();
                    MIMEEntity body = doc.createMIMEEntity( field );
                 
                    value.forEach( (fileName, fileData) ->
                    {
                        try {
                            System.out.println( "fileName = " + fileName );
                            stream.writeText( fileData );
                            MIMEEntity child = body.createChildEntity();
                            MIMEHeader header = child.createHeader( "Content-Type" );
                            header.setHeaderVal( "multipart/related" );
                            header = child.createHeader("Content-Disposition" );
                            header.setHeaderVal( "attachment; filename=" + fileName );
                            header = child.createHeader( "Content-ID" );
                            header.setHeaderVal( fileName );
                            //child.setContentFromText( stream, "text/plain;charset=UTF-8", MIMEEntity.ENC_BASE64 );
                            child.setContentFromText( stream, "application/octet-stream;charset=UTF-8", MIMEEntity.ENC_BASE64 );
                            stream.close();                    
                            stream.recycle();
                         
                        } catch (NotesException e2) {
                            // TODO Auto-generated catch block
                            e2.printStackTrace();
                        }
                     
                    } );
. . .
            if( compute ) {
                doc.computeWithForm(true, false);
            }
         
            doc.save(true, false, true);

Field Name: $FILE
Data Type: Attached Object
Data Length: 44 bytes
Seq Num: 1
Dup Item ID: 0
Field Flags: ATTACH SIGN SEAL SUMMARY

Object Type: File
Object ID: 00040212
Object Length: 3256
File Name: mime.123
Flags:
Host: MSDOS/OS2
Compression Type: NONE
Encoding Type:
File Attributes: RW PUBLIC
File Size: 3256
File Created: 21.08.2019 11:35:53
File Modified: 21.08.2019 11:35:53

private HashMap<String, Object > fields;
private HashMap<String, HashMap<String, String> > files;