Java EE PaaS and Application Server Interoperability

As observed in my earlier articles, the Java EE PaaS portfolio is gaining in strength each day, with support from major players such as IBM, Oracle, VMWare, Redhat , Google and Amazon.
However unlike the Microsoft > .NET Framework > Azure PaaS equation where there is just one version of the framework from one vendor, the openness of Java EE led to several implementations of application server-specific implementations.
As Java EE standards define a core set of API, frame works and features as part of its implementation, an application server is the container that executes these instructions and provides a development and runtime platform for Java EE applications.

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