Hi,
I use the OSGi Converter to convert a proxy of an Interface to a Map and I get
an exception:
org.osgi.util.converter.ConversionException: Cannot convert null to interface
java.util.Map
at
org.osgi.util.converter.ConvertingImpl.convertToMapType(ConvertingImpl.java:650)
at org.osgi.util.converter.ConvertingImpl.to(ConvertingImpl.java:187)
at
org.osgi.util.converter.CustomConverterImpl$ConvertingWrapper.to(CustomConverterImpl.java:176)
at
org.osgi.util.converter.CustomConverterImpl$ConvertingWrapper.to(CustomConverterImpl.java:144)
...
I don't know if it is a bug or not? Here is what I am doing:
1- I have two interfaces:
public interface ParentType
{
String test();
}
public interface ChildType extends ParentType
{
// Marker interface
}
2- I instantiate my proxy:
ChildType proxy = createProxy(); // My proxy return a constant "test" when
test() is invoked.
3- I try to convert and get the exception:
converter.convert(proxy).sourceAs(ChildType.class).to(new
TypeReference<Map<String, Object>>() {/**/}));
If I add a method to ChildType ('String qq();') the conversion works.
Here is what I have found while debugging:
1- The converter tries to determine if my source is a map type
(ConvertingImpl.isMapType)
2- For this, it calls the method ConvertingImpl.getInterfaces0(Class< ? > cls)
with cls=ChildType.class. For ChildType be considered as a map type, this
method should return a set of interfaces that contains ParentType.class (which
has public method) but it doesn't. Indeed, implemented/extended interfaces are
added to the result only if `cls` is not an interface, I don't really
understand why?
Sorry if this mail is a bit obscure and specific, I didn't find an other place
to ask...
You can find a repository demonstrating the issue here:
https://github.com/cdelg/demo-converter-bug-or-not
Thanks for help.
Clément._______________________________________________
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