자바 기술 관련 문서 https://docs.oracle.com/javase/tutorial/ https://docs.oracle.com/javase/8/docs/technotes/guides/ JDBC https://docs.oracle.com/javase/tutorial/jdbc/index.html Reflection API https://docs.oracle.com/javase/tutorial/reflect/TOC.html JAXB https://docs.oracle.com/javase/tutorial/jaxb/TOC.html RMI (Java Remote Method Invocation) https://docs.oracle.com/javase/tutorial/rmi/TOC.html