java.sql.SQLException: Io exception: Connection refused

Error: Error with oracle JDBC connection when incompatible jar referred in the class-path. 
Resolution: Use the correct ojdbc.jar and run the application. 

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186647296)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))

at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)

at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:572)

at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:636)

at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:665)

at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:673)

at org.springframework.jdbc.core.JdbcTemplate.queryForObject(JdbcTemplate.java:728)

at com.hm.dao.impl.UserDetailsDAOImpl.getUserDetails(UserDetailsDAOImpl.java:28)

at com.hm.service.impl.UserDetailsServiceImpl.getUserDetails(UserDetailsServiceImpl.java:21)

at com.hm.main.FileTransferService.main(FileTransferService.java:53)

Caused by: java.sql.SQLException: Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186647296)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:333)

at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:404)

at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:468)

at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)

at java.sql.DriverManager.getConnection(DriverManager.java:317)

at java.sql.DriverManager.getConnection(DriverManager.java:297)