public class BankServiceImpl implements BankService {

public BigDecimal getAccountBalance(String accountNumber) {
    BalanceEnquiry balanceEnquiry= new BalanceEnquiry();
    return balanceEnquiry.getBalanceAmount(accountNumber);
}

public class BalanceEnquiry extends JdbcDaoSupport {

public BigDecimal getBalanceAmount(String accountNumber) {

    String sql = "Select balanceAmount from accountDetails where accountNumber=?";

    BigDecimal balanceAmount = (BigDecimal) getJdbcTemplate()
            .queryForObject(sql, new Object[] { accountNumber },
                    BigDecimal.class);

    return balanceAmount;
}

java.lang.NullPointerException
at com.cts.dao.balanceenquiry.BalanceEnquiry.getBalanceAmount(BalanceEnquiry.java:13)
at com.cts.bankops.impl.BanksServiceImpl.getAccountBalance(BankServiceImpl.java:20)