dataType class loading issue in managed containers such as play framework

[yaronyam]

When setting dataType on ApiModelProperty annotation, where the type is referenced from an ApiImplicitParam annotation - I get the below exception, running from Play Framework 2.4.6.
This issue may be relevant to other frameworks. This is due to the framework's customized class loading mechanism. In play - the project sources are loaded in a child class loader of the loaded dependencies, this cater for hot swapping during development. As a side effect, a class imported as a dependency can't load a local project class from it's current class loader or one of it's parent class loaders.
Sorry for the lack of UT coverage, it was difficult for me to simulate such a scenario.

Caused by: java.lang.IllegalArgumentException: Unrecognized Type: [null]
    at com.fasterxml.jackson.databind.type.TypeFactory._constructType(TypeFactory.java:405) ~[jackson-databind.jar:2.5.4]
    at com.fasterxml.jackson.databind.type.TypeFactory.constructType(TypeFactory.java:354) ~[jackson-databind.jar:2.5.4]
    at com.fasterxml.jackson.databind.ObjectMapper.constructType(ObjectMapper.java:1332) ~[jackson-databind.jar:2.5.4]
    at io.swagger.scala.converter.SwaggerScalaModelConverter.resolveProperty(SwaggerScalaModelConverter.scala:34) ~[na:na]
    at io.swagger.converter.ModelConverterContextImpl.resolveProperty(ModelConverterContextImpl.java:79) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.jackson.ModelResolver.resolve(ModelResolver.java:355) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.jackson.ModelResolver.resolve(ModelResolver.java:159) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.scala.converter.SwaggerScalaModelConverter.resolve(SwaggerScalaModelConverter.scala:101) ~[na:na]
    at io.swagger.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:99) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:138) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:103) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.scala.converter.SwaggerScalaModelConverter.resolveProperty(SwaggerScalaModelConverter.scala:69) ~[na:na]
    at io.swagger.converter.ModelConverterContextImpl.resolveProperty(ModelConverterContextImpl.java:79) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.converter.ModelConverters.readAsProperty(ModelConverters.java:58) ~[swagger-core-1.5.4.jar:1.5.4]
    at io.swagger.util.ParameterProcessor.applyAnnotations(ParameterProcessor.java:155) ~[swagger-core-1.5.4.jar:1.5.4]
    at play.modules.swagger.PlayReader.readImplicitParam(PlayReader.java:386) ~[swagger-play2_2.11-1.5.0.jar:1.5.0]