Inconsistent behaviour when accessing java.util.*-classes

[tschoergez]

Hi!

In a workflow I try to work with some java.util.*-Classes, and get some strange behaviour:

Working with java.util.Random works as expected, I can access methods of the class without problems.

Trying the same with java.util.Calendar or GregorianCalendar does not work: I always get a "Cannot find function ....()" error when calling a mehtod of Calendar / GregorianCalendar!

(See example code below)

What do I miss?

Download the full example-workflow from the attachment...

Regards,

Joerg

The Code:

//ACCESS java.util.Random works as expected
var rnd = new java.util.Random();
//print out all attributes of rnd
for (var i in rnd) {
System.debug("i: " + i );
}
System.debug("rnd: " + rnd);
var rndint = rnd.nextInt();
System.debug("rndint: " + rndint);
//ACCESS java.util.TimeZone works as expected
var ids = java.util.TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000);
System.debug("ids: " + ids);
var  pdt = new java.util.SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]);
System.debug("pdt: " + pdt);
//ACCESS Constants in java.util.Calendar works as expected
System.debug("APRIL: " + java.util.Calendar.APRIL);
 // set up rules for daylight savings time
 pdt.setStartRule(java.util.Calendar.APRIL, 1, java.util.Calendar.SUNDAY, 2 * 60 * 60 * 1000);
 pdt.setEndRule(java.util.Calendar.OCTOBER, -1, java.util.Calendar.SUNDAY, 2 * 60 * 60 * 1000);
 // create a GregorianCalendar with the Pacific Daylight time zone
 // and the current date and time
 var calendar = new java.util.GregorianCalendar(pdt);
System.debug("calendar: " + calendar);
//(try to) print out all attributes of calendar: shows nothing!?!?!
for ( i in calendar) {
System.debug("i: " + i );
}
System.debug("========");
//create a calender, and set time to yesterday...
 var trialTime = new Date((System.getCurrentTime() - (24 * 60 * 60 * 1000)));
System.debug("trialTime: " + trialTime);
 calendar.setTime(trialTime);
System.debug("calendar: " + calendar);
// Creating a java.util.Calendar works
var cl =  java.util.Calendar.getInstance();
System.debug("cl: " + cl);
//**** ACCESS methods of java.util.calendar does not work!
var test = cl.getFirstDayOfWeek();

[bbonev · Accepted solution]

Hi,

I tested locally and indeed it is the same problem. However this doesn’t seem to be vCO specific problem. I debugged the server and it seems that the Mozilla Rhino JS engine, that we are using, maps the java.util.Calendar and GregorianCalendar to a native (JS) date type. When you try to invoke a method, the Rhino engine tries to call this method on this NativeObject and it doesn’t have it declared and that’s why you get this exception. I don’t know how urgent for you is to use java.util.Calendar, but I would recommend not using it. You can use our JS Date type instead.

By the way this problem is not only with Calendar. It is a generic problem. If you create a new ArrayList, for example, the JS engine will map it to a native array and you won’t be able to call ArrayList’s methods.

Although I didn’t solve your problem, hope this helps you understand the JS integration with Java.

[tschoergez]

Hi!

Thank you very much for your time to do these tests!

And good to know that neither I did miss a thing nor there is some bug in vCO related to this .

I tried to create a plugin, and one of it's classes needed a calendar as input (crazy: alternatively it uses an ArrayList with properties, so thanks to your explanation I will save a lot of time trying this as replacement 🙂 )...

Regards,

Joerg