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https://issues.apache.org/jira/browse/LOG4J2-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962606#comment-13962606
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Ralph Goers commented on LOG4J2-598:
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I would have to look at the plugins we have created. We should do the normal 
strategy of aiming to cover the top 80% of what is happening in a typical 
plugin factory as far as parameter validation goes.  I could envision that 
things like min and max values, or a list of valid values might be there but I 
would take these things one at a time.  Starting with just doing the data 
conversion from Strings in XML or JSON to the correct data type goes a long way 
towards simplification.

> Support more data types in plugin attributes
> --------------------------------------------
>
>                 Key: LOG4J2-598
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-598
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.0-rc1
>            Reporter: Matt Sicker
>            Assignee: Matt Sicker
>            Priority: Minor
>              Labels: annotations, plugins
>
> Currently, annotating plugin factory method parameters with 
> {{@PluginAttribute}} only supports String types, but we use a lot of plugin 
> attributes that could be automatically converted to primitive types. Now I'm 
> not suggesting something as advanced as how Camel handles parameter injection 
> (which does automatic non-trivial type conversion), but it would be great to 
> support booleans, ints, longs, etc., to simplify quite a bit of extraneous 
> string parsing.



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