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https://issues.apache.org/jira/browse/CAMEL-4233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066383#comment-13066383
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Claus Ibsen commented on CAMEL-4233:
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Okay the OSGi pieces is also in place, and all tests passes.
> avoid runtime package scanning to discover TypeConverters
> ---------------------------------------------------------
>
> Key: CAMEL-4233
> URL: https://issues.apache.org/jira/browse/CAMEL-4233
> Project: Camel
> Issue Type: Improvement
> Components: camel-core
> Affects Versions: 2.7.0
> Reporter: james strachan
> Assignee: Claus Ibsen
> Fix For: 2.8.0
>
>
> Package scanning to discover classes annotated with @Converter is slow. Plus
> on many containers (especially commercial JEE containers) its not even
> possible; since ClassLoader.getResource() doesn't often return file system
> based URIs you can easily convert to a java.io.File so you can list files in
> a directory.
> Finding known resources/classes in class loaders generally works; scanning
> packages is generally more problematic - as well as being slow.
> So it would be better if Camel could use a text file per jar containing all
> the fully qualified class names of the converters to use. Then no package
> scanning is required. Or rather we only need to use package scanning if a
> text file contains packages (rather than fully qualified classes). i.e. do
> the package scanning at build time (when you have full access to the file
> system :) rather than at runtime when you generally don't have access to the
> files - and expanding jars to look inside them is awfully slow.
> In addition it'd be great if we added a maven plugin - or Java compiler
> AnnotationProcessor we can use with the compile step - to generate the
> META-INF/services/org/apache/camel/TypeConverter file automatically as part
> of the build. Then users don't even have to think about it; they just add
> @Converter to a class and the plugin generates the text file as part of the
> build., using fully qualified class names - so no package scanning required
> at runtime - and much faster startup times too
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