► JEST Servlet must be deployed within the same module scope of the application.  
  ► The unit name of the persistence unit used by the application must be known to JEST Servlet  
  ► The persistence unit must be configured with 
     openjpa.EntityManagerFactoryPool=true
  
  Once JEST servlet knows the name of the persistence unit, it can 
  ► browse the domain model
  ► execute query 
  from any web browser in a meta-data driven, generic fashion
  i.e. without knowing anything further about he application.
  
<servlet> <servlet-name>demo</servlet-name> <servlet-class>demo.SimpleApp</servlet-class> </servlet> <servlet-mapping> <servlet-name>demo</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> <!-- Deployment descriptor for JESTServlet. --> <servlet> <servlet-name>jest</servlet-name> <servlet-class>org.apache.openjpa.persistence.jest.JESTServlet</servlet-class> <init-param> <param-name>persistence.unit</param-name> <param-value>jestdemo</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>jest</servlet-name> <url-pattern>/jest/*</url-pattern> </servlet-mapping>