#1157 - Fixed custom EntityModel serialization for Map payloads.

Using a custom serializer seems to break downstream projects that also register serializers for EntityModel. We're now using extra methods on EntityModel itself that do the trick as well.

src/main/java/org/springframework/hateoas/EntityModel.java

@@ -23,6 +23,7 @@ import java.util.Map;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
 import com.fasterxml.jackson.annotation.JsonAnySetter;
 import com.fasterxml.jackson.annotation.JsonUnwrapped;
 
@@ -80,6 +81,11 @@ public class EntityModel<T> extends RepresentationModel<EntityModel<T>> {
 
 	// Hacks to allow deserialization into an EntityModel<Map<String, Object>>
 
+	@JsonAnyGetter
+	private Map<String, Object> getMapContent() {
+		return Map.class.isInstance(content) ? (Map<String, Object>) content : null;
+	}
+
 	@JsonAnySetter
 	private void setPropertiesAsMap(String key, Object value) {
 		getOrInitAsMap().put(key, value);