spring jdbc suddenly throws class not found error on SingleColumnRowMapper-Collection of common programming errors

I have been developing a Spring project about 6 months. This project is built with maven and spring. Suddenly today i discovered that jdbc sections of the code throwing the error below. I made some changes to my web services in the project lately but I did not change any maven configurations or spring configurations since the last time the application worked stable. Where should I start to look for the error?

Any comment is appreciated.

Caused by: java.lang.NoClassDefFoundError: org/springframework/jdbc/core/SingleColumnRowMapper
    at org.springframework.jdbc.core.JdbcTemplate.getSingleColumnRowMapper(JdbcTemplate.java:1184)
    at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:744)
    at com.pozitron.bkmtransfer.core.dao.AcsKeyAliasDaoImpl.findRsaPubKeyByBankId(AcsKeyAliasDaoImpl.java:43)
    at com.pozitron.bkmtransfer.services.core.CipherActionImpl.verify(CipherActionImpl.java:97)
    at com.pozitron.bkmtransfer.services.TransferActionImpl.transferMoney(TransferActionImpl.java:67)
    at com.pozitron.bkmtransfer.ws.endpoints.TransferEndPoint.transferMoney(TransferEndPoint.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)