Part 2 of changes for #4907 (converter access)

Author: cowtowncoder

src/main/java/tools/jackson/databind/introspect/BasicBeanDescription.java

@@ -676,17 +676,17 @@ protected Converter<Object,Object> _createConverter(Object converterDef)
             return (Converter<Object,Object>) converterDef;
         }
         if (!(converterDef instanceof Class)) {
-            throw new IllegalStateException("AnnotationIntrospector returned Converter definition of type "
-                    +converterDef.getClass().getName()+"; expected type Converter or Class<Converter> instead");
+            throw new IllegalStateException("`AnnotationIntrospector` returned `Converter` definition of type "
+                    +ClassUtil.classNameOf(converterDef)+"; expected type `Converter` or `Class<Converter>` instead");
         }
         Class<?> converterClass = (Class<?>)converterDef;
         // there are some known "no class" markers to consider too:
         if (converterClass == Converter.None.class || ClassUtil.isBogusClass(converterClass)) {
             return null;
         }
         if (!Converter.class.isAssignableFrom(converterClass)) {
-            throw new IllegalStateException("AnnotationIntrospector returned Class "
-                    +converterClass.getName()+"; expected Class<Converter>");
+            throw new IllegalStateException("AnnotationIntrospector returned `Class<"
+                    +ClassUtil.classNameOf(converterClass)+"`>; expected `Class<Converter>`");
         }
         HandlerInstantiator hi = _config.getHandlerInstantiator();
         Converter<?,?> conv = (hi == null) ? null : hi.converterInstance(_config, _classInfo, converterClass);