public class EmployeeDAO{

        public List<Map<String,Object>> viewEmployees() {

        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);

        //This is where i make the sql-statement
        List<Map<String, Object>> rows = jdbcTemplate.queryForList("SELECT * FROM employee");

        //here I want to return an List<Map<String,Object>> of rows
        return rows;
    }
}

public List viewEmployees(){List<Employee> employees = new ArrayList<>();
        EmployeeDAO employeeDAO = new EmployeeDAO();
        List<Map<String, Object>> rows = employeeDAO.viewEmployees();
        //For loop of rows (Employees)
        for (Map row : rows) {
            Employee employee = new Employee();
            employee.setId((int) (row.get("id")));
            employee.setName((String) (row.get("name")));
            employee.setPosition((String) (row.get("position")));
            employee.setProvision_goal((int) (row.get("provision_goal")));
            employee.setProvision_accumulated((int) (row.get("provision_accumulated")));
            employees.add(employee);
        }
        return employees;
    }

java.lang.IllegalArgumentException: Property 'dataSource' is required

    at org.springframework.jdbc.support.JdbcAccessor.afterPropertiesSet(JdbcAccessor.java:160) ~[spring-jdbc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at org.springframework.jdbc.core.JdbcTemplate.<init>(JdbcTemplate.java:166) ~[spring-jdbc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
    at com.example.demo.dao.EmployeeDAO.viewEmployees(EmployeeDAO.java:37) ~[classes/:na]
    at com.example.demo.services.EmployeeServiceImpl.viewEmployees(EmployeeServiceImpl.java:61) ~[classes/:na]
    at com.example.demo.controller.HomeController.home(HomeController.java:37) ~[classes/:na]