DATAREST-665 - Prevent non-serializable properties from making it into the schema.

We now explicitly skip non-Jackson-serializable properties from being rendered in the schema. This prevents exceptions in rare cases where the Jackson BeanPropertyDefinition is only backed by a setter.

The issue occurred with current Spring Data Gemfire as it considers a BigDecimal a PersistentEntity and then failed to produce a proper ResolvableProperty for setScale(…) as it's a setter-only property.

Related tickets: SGF-429.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/json/PersistentEntityToJsonSchemaConverter.java

@@ -166,8 +166,6 @@ public class PersistentEntityToJsonSchemaConverter implements ConditionalGeneric
 
 		JsonSchemaPropertyRegistrar registrar = new JsonSchemaPropertyRegistrar(jackson);
 
-		// final List<JsonSchemaProperty<?>> properties = new ArrayList<JsonSchema.JsonSchemaProperty<?>>();
-
 		for (BeanPropertyDefinition definition : jackson) {
 
 			PersistentProperty<?> persistentProperty = entity.getPersistentProperty(definition.getInternalName());
@@ -182,6 +180,10 @@ public class PersistentEntityToJsonSchemaConverter implements ConditionalGeneric
 				if (persistentProperty.isVersionProperty()) {
 					continue;
 				}
+
+				if (!definition.couldSerialize()) {
+					continue;
+				}
 			}
 
 			TypeInformation<?> propertyType = persistentProperty == null