through custom programming, I conducted extensive research on Java's mapping mechanism and JPA technology (at that time, only Hibernate was available), and developed an integration framework based on XML configuration. Through simple POJO codes and XML data, the system integration was achieved by reading and writing to the database. Later on, when I came across the Spring framework, I realized that the concept was similar, as both aimed to complete most of the coding work through configuration. In addition, I have experience in using enterprise-level MQ (Message Queue) and Cluster technologies during system installation and