Alexander Falb created JOHNZON-202:
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Summary: 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
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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