Beside Time4A, icu4j, which are too heavy libraries, I written a class to handle Persian calendar accurately and you can find it here:
https://github.com/hadilq/java-persian-calendar/blob/master/persian/src/main/java/ir/hadilq/PersianCalendar.java
As you can find it in its tests, this class supports from year 3000 before hijra to 3000 after hijra.
