SPR9157 draft

[ferengra]

The converter in this very little project without any security, interceptors etc. works fine.
However, the project the issue happens is much more complex.
It might be difficult to demostrate the issue as a sample.

[ferengra]

The demo for the issue is created.

I think the issue is on the line 432 in GenericConversionService.ConverterAdapter:
return this.typeInfo.getTargetType().equals(targetType.getObjectType());

In my view it should be:
return this.typeInfo.getTargetType().isAssignableFrom(targetType.getObjectType());

If you compare the version of 3.0.6 and 3.0.7 of GenericConversionService, you'll see that those lines were only added in 3.0.7.