I see that PostgreSQL, SQL Sever, Oracle, DB2, and H2 define bigint as a 8-byte signed integer, so it seems that SQL type is not a good fit for Java BigInteger.

Is it possible to change BigIntegerType back to using NumericTypeDescriptor, but with precision 20 and scale 0 (to accommodate the smallest bigint value, -9223372036854775808)? I seem to remember there was a complication for setting scale to 0 by default for Java BigInteger types...