We've updated the Recommended Reading List for JEE and WebSphere Application Server.
I've talked about our Recommended Reading Lists, compilations of what we think are the best articles for getting started in a topic area. We update them from time to time to add the latest articles.
We have just updated the Java EE (fka J2EE) reading list: "Recommended reading list: Java EE and WebSphere Application Server." Thanks to ISSW's Sree Ratnasinghe for making the updates. Check out the list, I think you'll find it helpful.
Bobby Woolf: WebSphere SOA and JEE in Practice
From archive: September 2009 X
I find that customers often confuse the role of an environment with its quality of service.
I previously discussed Data Center Environments, specifically the typical environment roles of Dev, Test, Stage, and Prod. These separate environments keep code under development (Dev) away from code the enterprise's users use to do their work (Prod). They also create a reliable, controlled environment for performing testing (Test) and for practicing installation and migration procedures (Stage).
These are environment roles, which describe who should be able to access an environment, what it is used for, and therefore what it should and shouldn't contain. For example, only the Prod environment should be able to access and change real customer data. Stage may contain a separate copy of the production data. Dev and Test shouldn't even have a copy of the production data, which is probably confidential and should be protected, but instead should conatin a representative set of fake data. (Use a Data Obfuscator to produce test data from a set of production data.)
The role of an environment is often confused with the quality of service (QoS) an environment should support to meet its requirements. One common example is availability. The applications running in Prod are typically assumed to need to be available 24x7 (aka always). Test and Stage are understood to be unreliable, that they may be taken down or crash at any time as testing needs dictate. The Dev environment is typically assumed to be fairly reliable, but with the understanding that outages are acceptable.
These assumptions about the availability of different environments can become a problem for repository products like Rational Asset Manager (RAM) and WebSphere Services Registry and Repository (WSRR). Dev environments are typically not managed for reliability, yet products like RAM and WSRR (used in development to manage SOA governance) need to be reliably available. This is likewise true for the source code management system, but somehow the reliability requirements of RAM and WSRR are seen as being much more complex.
Long story short, customers often decide to install RAM and WSRR in their Prod environment simply because that has people prepared to manage WebSphere Application Server (WAS) servers (which is what RAM and WSRR run in) and make those WAS servers highly available. This, in my mind, is kind of crazy. RAM and WSRR store development artifacts, which are not used by production applications any more than source code is, and so should not be stored in Prod.
Customers often insist on installing RAM and WSRR in Prod because it's set up to make them highly available. I think the far better approach is to set up a couple of WAS servers in Dev for reasonable (maybe high) availability and install RAM and WSRR there, and assign personnel (who perhaps normally work in Prod) to manage those servers in Dev.
I'd be interested to hear from customers using RAM and/or WAS: What environment do you have them installed in?
One issue I see customers get confused on is the purpose of separate but equivalent software environments.
An enterprise should divide its IT servers and software into multiple separate and fairly independent environments. The number and purpose of these can vary somewhat, but a typical separation is these four environments:
These environments are actually four roles than an environment can play. An environment in the Dev role needs development tools and test data, but probably doesn't need monitoring. The environment in the Prod role is the only one that should store confidential customer data and should have monitoring to verify that it's running properly.
The role of an environment is independent of its quality of service (QoS) requirements, a topic I'll discuss in my next posting.