in src/main/java/org/apache/sling/javax/activation/internal/OsgiMailcapCommandMap.java [70:77]
    public void addMailcapEntries(InputStream mailcapFile, Bundle originatingBundle) throws IOException {
        synchronized (sync) {
            db.put(originatingBundle, new MailcapFile(mailcapFile));
        }
        log.debug("Added mailcap entries from bundle {}", originatingBundle);
    }