(J2EE, as a complete set of standard integration platform for enterprise level development of mission critical, has many standards and broad content, and then brings many "troubles" to the development of J2EE use. For example, in order to realize RDBMS storage of content, our possible methods include JDBC, EntityBeans, JDO, O/R Mapping tools (TopLink, Hibernate), XML-DBMS, JAXB, etc. This document includes the following annexes:)