Key benefits of multitier J2EE

• Manageability: Each tier can be monitored, tuned and upgraded independently and different people can have clearly defined responsibilities.
• Scalability: More hardware can be added and allows clustering (i.e. horizontal scaling).
• Maintainability: Changes and upgrades can be performed without affecting other components.
• Availability: Clustering and load balancing can provide availability.
• Extensibility: Additional features can be easily added.