These processes reduce waiting time, organize patient flow, and greatly improve the quality of care by optimizing resources. The Java 2 Platform, Enterprise Edition (J2EE) was extensively used to build this mission-critical application and to achieve the required level of integration. Using J2EE technologies such as Enterprise JavaBeans (EJB), Java Servlet, JavaServer Pages (JSP), Java Message Service (JMS), Java technology Transaction API (Java TTA), and Java Authentication and Authorization Service (JAAS), it was possible to create a robust and high-performance application, with a high level of reuse and flexibility. Taking advantage of the new Java technology annotations facility, a large part of the code was automatically generated, which sped the development and reduced the number of errors.