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From "Mark Struberg (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (JOHNZON-202) org.apache.johnzon.mapper.Adapter JavaDoc wrong and IllegalArgumentException-message from org.apache.johnzon.mapper.Mappings misleading
Date Sat, 27 Jul 2019 17:57:00 GMT

     [ https://issues.apache.org/jira/browse/JOHNZON-202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mark Struberg reassigned JOHNZON-202:
-------------------------------------

    Assignee: Mark Struberg

> org.apache.johnzon.mapper.Adapter JavaDoc wrong and IllegalArgumentException-message
from org.apache.johnzon.mapper.Mappings misleading
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JOHNZON-202
>                 URL: https://issues.apache.org/jira/browse/JOHNZON-202
>             Project: Johnzon
>          Issue Type: Improvement
>          Components: Mapper
>    Affects Versions: 1.1.11
>            Reporter: Alexander Falb
>            Assignee: Mark Struberg
>            Priority: Major
>         Attachments: image-2019-02-19-14-59-17-119.png
>
>
> {{org.apache.johnzon.mapper.Adapter<A, B>}} states, that {{A}} is taken from JSON
and converted to {{B}} to store in the POJO. Following this, I implemented 3 adapter for java.time.*
classes. When calling {{Mapper#writeObjectAsString(Object)}} the following exception is thrown:
> {code:java}
> java.lang.IllegalArgumentException: Ambiguous adapter for org.apache.johnzon.mapper.access.FieldAccessMode$FieldReader@5e265ba4
>   at org.apache.johnzon.mapper.Mappings.findConverter(Mappings.java:593)
>   at org.apache.johnzon.mapper.Mappings.addGetterIfNeeded(Mappings.java:494)
>   at org.apache.johnzon.mapper.Mappings.createClassMapping(Mappings.java:412)
>   at org.apache.johnzon.mapper.Mappings.findOrCreateClassMapping(Mappings.java:361)
>   at org.apache.johnzon.mapper.Mapper.isDeduplicateObjects(Mapper.java:141)
>   at org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:134)
>   at org.apache.johnzon.mapper.Mapper.writeObjectAsString(Mapper.java:178)
>   at JohnzonTestMain.main(JohnzonTestMain.java:27){code}
> While debugging this problem I found the following:
> (my custom adapers are highlighted - it looks like I implemented them the wrong way)
> !image-2019-02-19-14-59-17-119.png!
> I think the JavaDoc of Adapter is wrong. The {{A to(B b);}} method is ment to convert
from a JSON-value to a Java-value and {{B from(A a);}} from a Java-value to a JSON-value (A
is the Javatype and B the JSONtype)?
> Also the exception is kind of misleading. Getting the actually ambiguous key would have
been helpful.
>  
> If you are interested I can provide a PR on GitHub, fixing the JavaDoc and changing the
exception message?



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