Unexpected end of file Exception

[Marc]

I have currently no idea what´s here the issue and I asked kindly for help.

I´m generating a ics - File. But if I would like to open the ics - File to get the Calender, I got the following error message:

net.fortuna.ical4j.data.ParserException: Error at line 1:Unexpected end of file

Here my information:
ical4j Version 3.0.1
Java: 8 Build 181

My output from the ics - File:

BEGIN:VCALENDAR
PRODID:-//Ben Fortuna//iCal4j 1.0//EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTSTAMP:20180826T165052Z
DTSTART:01180905T000000
DTEND:01180905T000000
SUMMARY:ddd
TZID:Europe/Berlin
UID:1535302250819-9ed0489f-0320-4a66-8f9c-4af0e62cdedd
END:VEVENT
END:VCALENDAR

Here my code for generation the calender.ics - File:

public void createEvent(BookingDate bookingDate, Mandatory mandatory, Employee employee)
        throws FileNotFoundException, IOException, ParserException, ConstraintViolationException {

    // Create a TimeZone
    System.setProperty("net.fortuna.ical4j.timezone.cache.impl", MapTimeZoneCache.class.getName());

    TimeZoneRegistry registry = TimeZoneRegistryFactory.getInstance().createRegistry();
    TimeZone timezone = registry.getTimeZone("Europe/Berlin");
    VTimeZone tz = timezone.getVTimeZone();

    String pathMandatoryFile = null;
    String pathEmployeeFile = null;

    // Reading the file and creating the calendar
    Calendar icsCalendar = null;
    FileOutputStream fout = null;

    if (bookingDate.isCreateCalendarMandatoryEntry()) {
        // timezone = registry.getTimeZone(mandatory.getTimeZone());

        pathMandatoryFile = "calendar.ics";
        fout = new FileOutputStream(pathMandatoryFile);
        try {
            FileInputStream fin = new FileInputStream(pathMandatoryFile);
            CalendarBuilder builder = new CalendarBuilder();
            icsCalendar = builder.build(fin);
        } catch (Exception e) {

        }

        if (icsCalendar == null) {
            icsCalendar = createNewCalender(pathMandatoryFile);
        }
    }

Can you help me, please

[LuckyLuigi]

I suspect you need to close your inputstream to flush the buffer