Caused by: java.sql.SQLException: JDBC SQL type id = 16 is unknown to this driver
at sap.jdbc4.sqlanywhere.IIPreparedStatement.setNull(Native Method) ~[sajdbc4.jar:na]
at sap.jdbc4.sqlanywhere.IPreparedStatement.setNull(IPreparedStatement.java:327) ~[sajdbc4.jar:na]

Note: ASA allow 'null' value for 'BIT' datatype;