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https://issues.apache.org/jira/browse/JOHNZON-152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16306341#comment-16306341
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Romain Manni-Bucau commented on JOHNZON-152:
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@Steven: if it helps here is a 'test) implementation which does exactly that
https://github.com/apache/johnzon/blob/master/johnzon-mapper/src/test/java/org/apache/johnzon/mapper/ObjectTypeTest.java#L249
> Ability to serialize field of a type from value introspection instead of
> field introspection
> --------------------------------------------------------------------------------------------
>
> Key: JOHNZON-152
> URL: https://issues.apache.org/jira/browse/JOHNZON-152
> Project: Johnzon
> Issue Type: Wish
> Components: Mapper
> Affects Versions: 1.1.5
> Reporter: Steven Walters
> Priority: Minor
>
> In our project, we have a few types that have an Object field that is used to
> accept a few different types of objects.
> * Sometimes the field is an effective primitives (Float, Integer, Long, etc)
> * Sometimes they're Collections (List, Set)
> * Sometimes they're other custom defined objects
> Right now johnzon mapper determines the type of the field based on its
> defined type "Object" which means just about nothing. This almost always
> causes serialization issues (with default behavior) unless its null.
> We would like to have an annotation (such as @JohnzonDynamic) to indicate the
> field is dynamic and its type should be determined via introspection of the
> value, rather than the field's declared type. Similar to how a map's value is
> done.
> For simplicity, this could be considered a read-only field to avoid the
> complexity of trying to set this field to whatever data comes in during
> deserialization.
> Right now we're working around this via a custom ObjectWriter that converts
> the object to a map and then passes the map to serialization, which has some
> inconveniences of maintenance.
> Maybe other projects could see some use of this?
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