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Posted to dev@johnzon.apache.org by "Kevin (JIRA)" <ji...@apache.org> on 2019/07/24 06:52:00 UTC
[jira] [Created] (JOHNZON-223) Deserialization of objects with
generic types leads to an error
Kevin created JOHNZON-223:
-----------------------------
Summary: Deserialization of objects with generic types leads to an error
Key: JOHNZON-223
URL: https://issues.apache.org/jira/browse/JOHNZON-223
Project: Johnzon
Issue Type: Bug
Components: JSON-B
Affects Versions: 1.1.12
Reporter: Kevin
In our project we use generic containers e.g. for enums to enrich them with additional information. For the serialization in Json we use an own adapter.
Serialization in Json works without problems, but deserialization into an object results in an error:
{code:java}
javax.json.bind.JsonbException: Cannot cast sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl to java.lang.Class{code}
From my point of view the problem lies in the method
{code:java}
org.apache.johnzon.mapper.Mappings.findConverter line 570
final ParameterizedType type = ParameterizedType.class.cast(decoratedType.getType());
final Type rawType = type.getRawType();
if (Class.class.isInstance(rawType)
&& Collection.class.isAssignableFrom(Class.class.cast(rawType))
&& type.getActualTypeArguments().length >= 1) {
typeToTest = type.getActualTypeArguments()[0];
} // TODO: map{code}
The condition checks here whether it is a collection, otherwise nothing else is done for ParameterizedTypes.
However, the variable typeToTest should be set to rawType for ParameterizedTypes so that a converter can be found afterwards. Otherwise typeToTest remains a ParameterizedType and the query in line 576 if (converter == null && Class.class.isInstance(typeToTest)) fails and no converter will be searched.
A small test can be found here: [https://gist.github.com/kevinwilken/12da681534053b776247697c6f24c296]
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