https://tools.ietf.org/html/draft-ietf-calext-extensions-00

The no-arg constructor of CalendarValidatorImpl was removed in 3.0.11. It is required by net.fortuna.ical4j.extensions.validate.ExtensionsCalendarValidator.

Hi,

I was checking out the code and I see in CalendarServerAccess.java,

When we're initializing ImmutableCalendarServerAccess,
it calls

public CalendarServerAccess(ParameterList aList, String value) {
        super(PROPERTY_NAME, aList, new Factory());
        setValue(value);
    }

which eventually calls the setValue method defined in ImmutableCalendarServerAccess:

    private static final class ImmutableCalendarServerAccess extends CalendarServerAccess {
        private static final long serialVersionUID = -2054338254L;

        private ImmutableCalendarServerAccess(String value) {
            super(new ParameterList(true), value);
        }

        public void setValue(String aValue) {
            throw new UnsupportedOperationException("Cannot modify constant instances");
        }
    }

I'm wondering if I'm using this library wrong or is this a real issue.
because I see in similar class like ical4j Method.java, the ImmutableMethod will call the super constructor which will use this.value = value and not invoking the setValue method.

I know that those code were there for quite a long time, so I'm wondering if I'm using this library in a wrong way.

Thanks. Looking forward to your reply.

I'm using ical4j-extension 1.0.3 and ical4j 2.2.0

Current plugin implementation uses ServiceLoader and doesn't support Android and OSGi environments.

Use the extensions library to support multiple injection models to support different environments.

• ServiceLoader, refactor current implementation to load from extensions library
• OSGi
• Spring
• guice

I want to use a calendar published in Confluence, but this fails on the property SUBCALENDAR-ID

net.fortuna.ical4j.data.ParserException: Error at line 177:Illegal property [SUBCALENDAR-ID]
Caused by: java.lang.IllegalArgumentException: Illegal property [SUBCALENDAR-ID]

cfr. ics-file in attachement
calendar.txt

http://tools.ietf.org/html/draft-daboo-valarm-extensions-04#section-8.1

Relates to:

http://sourceforge.net/p/ical4j/bugs/167/

The ‘ical4j’ package works without issue on Android.

It seems that the keywords in my ICS file require an ‘extension’. When I try to build with ‘ical4j-extensions’, I get the Java8 error when trying to create the APK.

parser_error.txt

Compilation works without error, but fails on package creation.

We are using iCal4J 2.0.0 with iCal4J extensions 1.0.0 (all the latest). When constructing a new Calendar object, the AbstractCalendarValidatorFactory is setting its static CalendarValidatorFactory instance to a DefaultCalendarValidatorFactory instead of the expected ExtensionsCalendarValidatorFactory, which happens to be second in the Iterator returned by ServiceLoader. Is this a bug or is there something that should be done to get the classes to load in the proper order so that the ExtensionsCalendarValidatorFactory is used? As it stands right now, we are required to use the Calendar constructor that takes the Validator in order to explicitly set the ExtensionsCalendarValidator as the validator to use. Otherwise, any Calendars that use extensions will fail validation.

FWIW, we were using iCal4J 1.0.6 and iCal4J extensions 0.9.2 previously and didn't need to do anything special to handle the extensions validation (though I see the validation framework was handled completely differently on those older versions).

Thanks for providing a great open source library!