DATACMNS-596 - Polishing.

PersistentEntityInformation now falls back to null values for PersistentEntity instances that don't expose an identifier property.

src/main/java/org/springframework/data/repository/core/support/PersistentEntityInformation.java

@@ -18,6 +18,7 @@ package org.springframework.data.repository.core.support;
 import java.io.Serializable;
 
 import org.springframework.data.mapping.PersistentEntity;
+import org.springframework.data.mapping.PersistentProperty;
 import org.springframework.data.mapping.model.BeanWrapper;
 import org.springframework.data.repository.core.EntityInformation;
 
@@ -49,7 +50,14 @@ public class PersistentEntityInformation<T, ID extends Serializable> extends Abs
 	 */
 	@Override
 	public ID getId(T entity) {
-		return (ID) persistentEntity.getPropertyAccessor(entity).getProperty(this.persistentEntity.getIdProperty());
+
+		PersistentProperty<?> property = persistentEntity.getIdProperty();
+
+		if (property == null) {
+			return null;
+		}
+
+		return (ID) persistentEntity.getPropertyAccessor(entity).getProperty(property);
 	}
 
 	/*