JEE App vs Middleware Product like PS

JEE App

JEE Focus on supporting "enterprise" rather than "middleware"
Enterprise JEE App
Middleware JEE App Product
Developed & maintained by Enterprise
Developed & maintained by middleware "vendor". Possibly extended by third party integrators before deployment in Enterprise.
Need not be portable across multiple JEE brand containers
Should be portable across multiple JEE brand containers
Installation involves deploying Enterprise JEE App in JEE container
Installation involves deploying middleware with configuration of tools (CLI, UIConsole, etc). Also, configuration for HA is something beyond what JEE containers supports.
Customized solution to enterprise problem. Need not be extensible.
Middleware needs to be extensible, customizable
Upgrading is comparatively easier
Upgrading is comparatively tougher

Challenges and Options

JEE Application Delivery
  1. Deliver pre-packaged JEE App archive (.war or .ear)
  2. Deliver un-packaged JEE App, build the archive just before deployment into JEE container
Internationalization and Localization
  1. All locales are bundled inside JEE App archive
  2. Locales are added on need basis to JEE App. The JEE App archive is not updated, but JEE App is intelligent enough to work with EndUser's locale, possibly referring resources from backend or another JEE App archive
Using Shared Libraries
  1. Bundle shared library as part of WEB-INF/lib [Standard]
  2. Put shared library as part of JEE container's classpath [Portability impact]
  3. Put shared library as JavaSE extension [JavaSE wide impact; possible linkage errors]
JEE Application Content Upgrades
  1. Bundle content as part of JEE App [Standard]
  2. Store content external to JEE App; either on file system or content management system
Distributed JEE Apps [List of issues]
  1. JEE Container or JavaSE classpath update for clustered JEE container instances
  2. JMX, Logging is JavaSE instance specific rather than clustered JEE container specific

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