Numeric overflow Exception in java JDBC

As the data in your DB is Number(11), this will not fit into an Integer.

Try a Long and rs.getLong(15);

Most likely you do not perform any mathematical operations with that "numbers". Since you do not treat them as numbers, but as identifiers. You should use Java type BigDecimal. This is a type which is most similar to Oracle datatype NUMBER. Or you can also use datatype provided by jdbc drivers oracle.sql.NUMBER.