[Springframework-developer] Use .java file as scripted beans

[Nicolas De L. <nic...@ca...>]

Hello guys,

I've looked at new script support and sounds great for quick design or 
prototyping "edit source code, hit refresh and get the result", BUT it 
requires to learn yet another langage.
I can agree that "grrovy is great" or "bsh is java like" or any other 
enthousiastic comment on scripting languages, but my development team 
has lots of junior java developers and my hierarchy has lot's of old 
schools men that will make very difficult to accept a "script" language 
as a valid technology.

I'm looking for a way to code scripted spring beans as 100% Java source 
code, using full IDE support, so that developer doesn't have to know 
some class is used a scripted bean and some other as compiled code. My 
first think comes to JSP that are runtime compiled (an re-compiled) by 
the container. It would be great to have a similar support for java code 
to be "runtime re-compilable". When the code gets fine, it can be 
classicaly compiled into a .class and pakaged into the app, by simply 
changing the spring context.

Looking at the way tomcat (jasper) compiles JSP, it seems it uses a 
custom classloader to load the runtime-compiled .class. My experience 
with classloaders is limited so I can say if it would be easy, but here 
is how I'd see this : a FactoryBean creates a proxy for the bean 
interface and delegates invocation to a "runtime-compiled" class in a 
child classloader. Hot recompilation requires the bean to be stateless, 
but this sounds an aceptable constraint if I can code my web controlers 
or business services by a quick code/test/code.

Thanks for any suggestion to make this a reality.

Nico.



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