On Jan 10, 2008, at 11:53 AM, Tom wrote:
Ok, I'm quite baffled about this one. And it's not complex, just
very very very strange. Bear with me.
I've just filed a bug report at http://bugs.caucho.com/view.php?id=2324
Hessian should be serializing the calendar as a handle, not the
calendar object itself, but this may have been added after 3.0.13.
-- Scott
Let me first give a quick description of the setup: I'm using
Hessian 3.0.13 to communicate between an applet and a class running
on Tomcat 4.1.31. Both the appplet and Tomcat run on Java 1.6.0_03.
The applet calls a method with a GregorianCalendar as a parameter.
The parameter is then cloned twice and one is moved to the
beginning of the week, and the other to the end of the week. Then
some more processing is done, but the problem is in the "beginning
of the week part".
For example, if the passed date is "2006-01-08" then the first day
in the week will be "2006-01-02". This is done by some fairly
simple math using the Calendar's getFirstDayOfWeek() and get
(Calendar.DAY_OF_WEEK) contained in the static gotoFirstDateOfWeek
(c) utility method .
The fun part comes now.
If the gotoFirstDateOfWeek() method is called in the applet BEFORE
the Calendar is sent using Hessian, this is the debug output:
gotoFirstDateOfWeek in=2006-01-08 19:49:38
!!!java.util.GregorianCalendar
[time=1136746178453,areFieldsSet=true,areAllFieldsSet=true,lenient=tru
e,zone=sun.util.calendar.ZoneInfo[id="Europe/
Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions
=143,lastRule=java.util.SimpleTimeZone[id=Europe/
Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,
startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=360000
0,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTim
e=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ER
A=1,YEAR=2006,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=8,DA
Y_OF_YEAR=8,DAY_OF_WEEK=1,DAY_OF_WEEK_IN_MONTH=2,AM_PM=1,HOUR=7,HOUR_O
F_DAY=19,MINUTE=49,SECOND=38,MILLISECOND=453,ZONE_OFFSET=3600000,DST_O
FFSET=0]
!!!1.6.0_03
lFirstDayOfWeek=2
lCurrentDayOfWeek=1
delta=-6
gotoFirstDateOfWeek out=2006-01-02 19:49:38
!!!java.util.GregorianCalendar
[time=1136230848015,areFieldsSet=true,areAllFieldsSet=true,lenient=tru
e,zone=sun.util.calendar.ZoneInfo[id="Europe/
Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions
=143,lastRule=java.util.SimpleTimeZone[id=Europe/
Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,
startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=360000
0,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTim
e=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ER
A=1,YEAR=2006,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=2,DA
Y_OF_YEAR=2,DAY_OF_WEEK=2,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=8,HOUR_O
F_DAY=20,MINUTE=40,SECOND=48,MILLISECOND=15,ZONE_OFFSET=3600000,DST_OF
FSET=0]
Perfect! You can see the incoming date, the fact that 6 days need
to be substracted and the resulting date.
Now the calendar is sent over the line and the same method is
called in the class:
gotoFirstDateOfWeek in=2006-01-08 19:49:38
!!!java.util.GregorianCalendar
[time=1136746178453,areFieldsSet=true,areAllFieldsSet=true,lenient=tru
e,zone=sun.util.calendar.ZoneInfo[id="Europe/
Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions
=143,lastRule=java.util.SimpleTimeZone[id=Europe/
Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,
startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=360000
0,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTim
e=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ER
A=1,YEAR=2006,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=8,DA
Y_OF_YEAR=8,DAY_OF_WEEK=1,DAY_OF_WEEK_IN_MONTH=2,AM_PM=1,HOUR=7,HOUR_O
F_DAY=19,MINUTE=49,SECOND=38,MILLISECOND=453,ZONE_OFFSET=3600000,DST_O
FFSET=0]
lFirstDayOfWeek=2
lCurrentDayOfWeek=1
delta=-6
gotoFirstDateOfWeek out=2008-01-04 19:49:38
!!!java.util.GregorianCalendar
[time=1199475648015,areFieldsSet=true,areAllFieldsSet=true,lenient=tru
e,zone=sun.util.calendar.ZoneInfo[id="Europe/
Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions
=143,lastRule=java.util.SimpleTimeZone[id=Europe/
Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,
startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=360000
0,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTim
e=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ER
A=1,YEAR=2008,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=4,DA
Y_OF_YEAR=4,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=8,HOUR_O
F_DAY=20,MINUTE=40,SECOND=48,MILLISECOND=15,ZONE_OFFSET=3600000,DST_OF
FSET=0]
A totally different outcome! Look at the year! And it still only
substracted 6 days. To answer the cry for sourcecode:
static public Calendar gotoFirstDateOfWeek(Calendar c)
{
System.out.println( "gotoFirstDateOfWeek in=" +
quickFormatCalendar(c));
System.out.println( "!!!" + c);
System.out.println( "!!!" + System.getProperty
("java.version"));
int lFirstDayOfWeek = c.getFirstDayOfWeek();
System.out.println( "lFirstDayOfWeek=" + lFirstDayOfWeek);
int lCurrentDayOfWeek = c.get(Calendar.DAY_OF_WEEK);
System.out.println( "lCurrentDayOfWeek=" + lCurrentDayOfWeek);
int lDelta = 0;
if (lFirstDayOfWeek <= lCurrentDayOfWeek)
{
lDelta = -lCurrentDayOfWeek + lFirstDayOfWeek;
}
else
{
lDelta = -lCurrentDayOfWeek - (7-lFirstDayOfWeek);
}
System.out.println( "delta=" + lDelta);
c.add(Calendar.DATE, lDelta);
System.out.println( "gotoFirstDateOfWeek out=" +
quickFormatCalendar(c));
System.out.println( "!!!" + c);
return c;
}
Now, I can actually work around this, by inserting the following
code at the beginning of the method:
static public Calendar gotoFirstDateOfWeek(Calendar c)
{
Calendar o = c;
c = new GregorianCalendar();
c.setFirstDayOfWeek( o.getFirstDayOfWeek() );
c.setMinimalDaysInFirstWeek( o.getMinimalDaysInFirstWeek() );
c.setTimeInMillis( o.getTimeInMillis() );
System.out.println( "gotoFirstDateOfWeek in=" +
quickFormatCalendar(c));
...
}
This basically creates a new Calendar and sets all relevant
properties so the behavior is correct again. Cloning does not help,
so something must get screwed when sending a Calendar via Hessian.
I tried the 3.1.3 release, but I get a bunch of HTTP 500 errors, so
no luck there so far.
Any suggestions?
Tom
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