Re: [e4-dev] minimum execution environment for the "org.eclipse.e4.core.

[Boris Bokowski <Boris_Bokowski@xxxxxxxxxx>]

I believe the answer is to use Java 1.5 for the e4.core.services bundle.

There is a general argument that being frugal with external dependencies - including dependencies within the Java class libraries - is a good thing. However, in this specific case, we created a fragment just so we could have the base bundle be on 1.4 even though we needed to use 1.5 class library functionality (annotations API) for the injector implementation.

It would make our life (specifically, Oleg's life) easier if we could merge the fragment back into the main bundle, so let's just do that.

Boris

Oleg Besedin---03/04/2010 03:08:38 PM---In the past we maintained that the minimum execution environment (EE) for the "org.eclipse.e4.core.

From:	Oleg Besedin/Ottawa/IBM@IBMCA
To:	e4-dev@xxxxxxxxxxx
Date:	03/04/2010 03:08 PM
Subject:	[e4-dev] minimum execution environment for the "org.eclipse.e4.core.services"
Sent by:	e4-dev-bounces@xxxxxxxxxxx

---

In the past we maintained that the minimum execution environment (EE) for the "org.eclipse.e4.core.services" bundle will be Foundation 1.1 / J2SE1.4. 

Overtime, we discovered that there were problems in keeping 1.4 as a minimum execution environment for dependency injection. Some problems were more on the convenience side ( https://bugs.eclipse.org/bugs/show_bug.cgi?id=284940 ), but some were rather fundamental. 

In Java 1.5 we can use annotations to match values in the contexts to injected fields and method arguments. In Java 1.4 we have to rely on tricks like adding special prefixes to field names and requiring injected methods to have special names. There is no good way to describe things like optional injections or providers. Moreover, the original code supporting 1.4, not being used, deteriorated over time and will require some effort to be fixed. While it can be made to work, there is a substantial extra cost to developing and maintaining two code paths. 

Recently the minimum EE for the bundle was bumped to 1.5 for other unrelated changes, so, this seems like a good time to revisit the question of minimum EE. 

My vote would be to say that dependency injection really needs Java 1.5+. That would allow us to merge back the services fragment, remove duplicate and deteriorated code, and provide cleaner, easier to understand API side to consumers. 

Any opinions? 

Sincerely, 
Oleg Besedin _______________________________________________
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