분영 아래와 같이 정상적으로 잘 연결한것 같지만 null 발생한다. java Controller -> Service -> ServiceImpl -> DAO -> DAO.xml ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerE..