7.2 WITH SERVLETS
With this introduction, how are Servlets and EJB's placed? Table 7.1 attempts to uncover this idea.
Table 7.1
| EJB | Servlet | |
|---|---|---|
| Web positioning layer (tier) | More towards backend, but broad based | More towards presentation |
| Primary responsibility | Persistence | Request-response mechanism |
| Nature of functionality | Encapsulate data | Expose data (present) |
| Enabler | Enterprise capability | Multi-threading capability |
| Enterprise concerns | Scalability,transactions, load-balancing,component based model (promoting reusability) | Can act as the controller (C in MVC) in the application |
| Tier | Three or more tier architecture | Two or three tier architecture |
| Development complexity | Complex | Simpler |
| Nature of application | Requirement for ... |
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