After sybase upgrade from 12.5 to 15,

we are getting java.lang.Exception: java.text.ParseException: Unparseable date: "YYYY-MM-DD"

SimpleDateFormat oldDateFmt = new SimpleDateFormat( oldFormat );
SimpleDateFormat newDateFmt = new SimpleDateFormat( newFormat );
Date dateObj = oldDateFmt.parse( date );

We are using jconn3.jar.

Is this an issue with code or jconn driver.? In any case, how to resolve it

your jconn3.jar may not be in the path where version 15 is looking.
a) change the path to use version 15
b) pass it during runtime