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resources.report.rules.findbugs.STCAL_STATIC_CALENDAR_INSTANCE.html Maven / Gradle / Ivy

STCAL: Static Calendar field (STCAL_STATIC_CALENDAR_INSTANCE)
Even though the JavaDoc does not contain a hint about it, Calendars are inherently unsafe for multihtreaded use.
Sharing a single instance across thread boundaries without proper synchronization will result in erratic behavior of the
application. Under 1.4 problems seem to surface less often than under Java 5 where you will probably see
random ArrayIndexOutOfBoundsExceptions or IndexOutOfBoundsExceptions in sun.util.calendar.BaseCalendar.getCalendarDateFromFixedDate().
You may also experience serialization problems.
Using an instance field is recommended.
For more information on this see Sun Bug #6231579
and Sun Bug #6178997.