in src/main/java/org/apache/sling/javax/activation/internal/OsgiMailcapCommandMap.java [106:126]
    private void getPreferredCommands(String mimeType, List<CommandInfo> accumulator, boolean fallback) {
        for (Map.Entry<Bundle, MailcapFile> entry : db.entrySet()) {
            Map<?, ?> commandMap = fallback ? entry.getValue().getMailcapFallbackList(mimeType) : entry.getValue()
                    .getMailcapList(mimeType);
            if (commandMap == null) {
                continue;
            }
            for (Object verbObject : commandMap.keySet()) {
                String verb = (String) verbObject;
                if (!commandsHaveVerb(accumulator, verb)) {
                    List<?> commands = (List<?>) commandMap.get(verb);
                    String className = (String) commands.get(0);
                    accumulator.add(new CommandInfo(verb, className));
                }
            }
        }
    }