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Three tier architecture system is more scalable than two tier as it supports hundreds of users and organization is also a lot more easier and also increases flexibility and freedom.

Configuring

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with Apache HTTPd

Summary

Using the Geronimo application server lets you build a secure enterprise infrastructure conforming to the latest standards and requirements.Geronimo supports provides two security options for both web-tier and J2EE EJB, programmatic and declarative.