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https://issues.apache.org/jira/browse/JAMES-2335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140583#comment-17140583
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Matthieu Baechler commented on JAMES-2335:
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Partial response:
> I do see it as a way to dynamically load / unload extensions like mailets and
> change the processing pipeline at runtime.
We don't need OSGi to load/unload things at runtime. It's not hard to load
things into a sub-classloader.
> OSGi really makes dependency management so much easier and is enforced by the
> classloader (which does not make available any "private" packages).
Do you mean Java modules are not providing that? I'm very curious, I thought it
does.
> Email is well-known. It seems to me that we ought to be able to provide good
> Java APIs with interchangeable implementations.
Yet there's no good implementation out there. The idea that email is a "done"
topic is completely wrong: just search an IMAP client library and you'll see
what I mean. Mime handling is not really better. I would not be writing email
code if it already existed.
> Using Declarative Services seems to me to be a lot cleaner than Guice.
There's overlap in features but they don't solve the same problem.
> It has a really advanced build system (BND) that works awesome with Gradle.
> Resolving dependencies and packaging up distributions is really clean and
> easy.
Sounds so cool. But you have to write code now or it doesn't exist, right?
> Modernize James configuration
> -----------------------------
>
> Key: JAMES-2335
> URL: https://issues.apache.org/jira/browse/JAMES-2335
> Project: James Server
> Issue Type: Improvement
> Components: configuration
> Reporter: Benoit Tellier
> Priority: Major
> Labels: feature, refactoring
>
> Apache James currently relies on commons-configuration, and thus on XML
> configuration files.
> As such the configuration process has several problems:
> - Working with XML is boiler plate
> - Working with file leads to a real lack of flexibility.
> - For instance, in a cluster environment, we would like all the James
> server to share the same configurations.
> - Also, in tests, we need to test the different configuration values.
> We can not do this without overwriting files, which is dangerous, and
> boilerplate.
> What we need is:
> - To represent all possible configuration via java objects.
> - Configuration providers should be able to convert the configuration stored
> into the java configuration object.
> - We should be able to inject different configuration providers from
> guice/spring.
> It would allow to specify alternative configuration backends (different
> formats, different storage techniques) and allow direct injection (for tests
> for instance).
> Here would be the steps for this work:
> - Add a *Initializable* class in *lifecycle-api*. This should be called by
> Guice and Sprint at initialization
> - *configure* in Configurable will save a Java object (parse the
> HierachicalConfiguration into a java object representing it's content).
> Initialization will then be done by *Initializable*.
> - Then we can move away, object by object, from the *Configurable*
> interface: We need to move the configuration parsing in a separated class
> (behind an interface). We can register *ConfigurationProviders*, with an
> XML/commons-configuration default implementation.
> - Deprecate *Configurable*.
> - Provide alternative configuration providers, for example, a Cassandra
> stored configuration provider
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