I don't have a concrete answer since I'd have to also debug. However, I can
make a suggestion to perhaps try:
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>org.apache.felix.converter</artifactId>
<version>1.0.8</version>
</dependency>
which is Apache Felix implementation of the osgi converter spec. What
you'll find is that it's moving along a little faster with bug fixes. It's
a drop in replacement.
It also means that Apache Felix mail list may have a few more bodies
monitoring it that have deep knowledge of the implementation details.
Also note that Apache Felix converter implementation was the seed code for
the official OSGi artifact.
- Ray
On Fri, May 17, 2019 at 12:43 PM Clément Delgrange via osgi-dev <
osgi-dev@mail.osgi.org> wrote:
> 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.
>
>
>
> _______________________________________________
> OSGi Developer Mail List
> osgi-dev@mail.osgi.org
> https://mail.osgi.org/mailman/listinfo/osgi-dev
--
*Raymond Augé* <http://www.liferay.com/web/raymond.auge/profile>
(@rotty3000)
Senior Software Architect *Liferay, Inc.* <http://www.liferay.com>
(@Liferay)
Board Member & EEG Co-Chair, OSGi Alliance <http://osgi.org> (@OSGiAlliance)
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