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2008: Decision Year for RIAs - October 20-22, 2008 San Jose

Responding to the "Adobe Flex Shortcomings" Java Blog
The Flex Shortcomings blog has been published recently which I first thought was a joke but the author seems to be serious

A blog Flex Shortcomings has been published on April 1. At first, I thought it’s a joke, but the author seems to be serious. These are some responses from Farata Systems.

By Yakov Fain:
1. IntellijIDEA 7.03 started supporting Flex, but this support is limited. This year the version 8.0 will be released which will compete with Flex Builder. And this is great, because tha latter has a lot of room for improvements.
2. Generics is one of the most confusing Java elements. The lack of generics in AS is a plus
3. No Concurrecny. Flex UI was designed as a single threaded app, with absolute different model of screen refresh if you compare it with Java Swing.
Flash player applocates time slices (frame events) to the clients CPU (screen refresh, AS code, events). The calls to the servers that are originated from
the client define callbacks that will be called when either results of faults are returned from the server. This model is cleaner than messing
with the dispatch thread in Swing. Also, it eliminates "frozen screens".
4. No dependency injection. This is just wrong. Flex is an event driven environment that allow lose coupling design of components.
If interested, I blog on the subj at
5. No abstract classes. True, but this is no big deal.
6. No method overloading. Action Script has a way to define methods with variable argument list (see args). This allows to emulate
method overloading if need be.
7. No constant in interfaces. True. I can live with that.

By Anatole Tartakovsky:
Vectors supporting types are the part of next release - and are billed more of performance/coding help then language enhancement. Most of the Java 5 constructs are not really applicable to ActionScript 3 - for fair comparison you need to use Java 7/8 with dynamic scripting language support - and then the way you speak that language changes.
Compare how enum support evolved in Java over the years - starting with patterns - and you would think of language as of evolving environment. I was coming to Java in '97 from C++ and I thought of it as a very poor language. 10 years made it almost tolerable - but I still miss ability to redefine operators - does it really matter to anyone who never did it in first place?

The code for model view controller you are basing your generics case upon is really bad way to do client side software. Not using generics actually allows for more generic code and better reuse of controls and libraries. That allows smaller libraries to be streamed to the client. It is common to take large Flex application ( >20,000 lines of code) built by Java shops, then re-build them using dynamic coding techniques and more generic code - ending up with less then 25% of the original size.

Multithreading is great thing - when it works - and that still require some skills in almost every environment. If you are up to multithreading, it is not hard to provide solution that instantiate and synchronize multiple Flash VMs

Dependency injections - again - Flex uses and promotes factories, gives you annotations both design time (code generator) and run-time (interpreting annotated type info). Combined with built-in introspection ( ie you have DYNAMIC language) it is much more then following pattern that fights with limitation of the language. With e4x XML/object model) and NATIVE getters and setters and Proxy objects you can build your beloved patterns - but time will be better spent on reading framework code and understanding patterns written natively using language

Every language and framework has it's strong and week points. I would not use Flex for a few things - but there is no comparable portable environment for building RIA at this point. Learning new language is fun - as long as you approach it as learning process.

Disclaimer. Farata Systems is an independent software vendor and consultancy. We are not getting paid in any shape or form by Adobe for promoting Flex.

About Yakov Fain
Yakov Fain is a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay. He wrote a thousand blogs ( and several books about software development. Yakov authored and co-authored such books as "Angular 2 Development with TypeScript", "Java 24-Hour Trainer", and "Enterprise Web Development". His Twitter tag is @yfain

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