Unwrap user type when checking if type is JPA-managed.

We now unwrap the user type in JpaMetamodelMappingContext.shouldCreatePersistentEntityFor(…) to enable usage of proxy types when requesting a PersistentEntity.

Previously, we checked against the proxy type which is not managed by the JPA meta-model.

Closes #2383

src/main/java/org/springframework/data/jpa/mapping/JpaMetamodelMappingContext.java

@@ -86,7 +86,7 @@ public class JpaMetamodelMappingContext
 	 */
 	@Override
 	protected boolean shouldCreatePersistentEntityFor(TypeInformation<?> type) {
-		return models.isMetamodelManagedType(type);
+		return models.isMetamodelManagedType(type.getUserTypeInformation());
 	}
 
 	/**

src/test/java/org/springframework/data/jpa/mapping/JpaMetamodelMappingContextIntegrationTests.java

@@ -22,6 +22,7 @@ import java.util.Collections;
 import javax.persistence.EntityManager;
 
 import org.hibernate.proxy.HibernateProxy;
+import org.hibernate.proxy.LazyInitializer;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -51,6 +52,7 @@ import org.springframework.transaction.support.TransactionTemplate;
  * @author Oliver Gierke
  * @author Thomas Darimont
  * @author Jens Schauder
+ * @author Mark Paluch
  * @since 1.3
  */
 @ExtendWith(SpringExtension.class)
@@ -75,6 +77,16 @@ public class JpaMetamodelMappingContextIntegrationTests {
 		assertThat(entity).isNotNull();
 	}
 
+	@Test // GH-2383
+	void considersProxiedTypes() {
+
+		JpaPersistentEntityImpl<?> directEntity = context.getRequiredPersistentEntity(User.class);
+		assertThat(directEntity).isNotNull();
+
+		JpaPersistentEntityImpl<?> unproxiedEntitx = context.getRequiredPersistentEntity(UserProxy.class);
+		assertThat(unproxiedEntitx).isNotNull().isSameAs(directEntity);
+	}
+
 	@Test
 	void detectsIdProperty() {
 
@@ -183,4 +195,17 @@ public class JpaMetamodelMappingContextIntegrationTests {
 	static class Config {
 
 	}
+
+	static class UserProxy extends User implements HibernateProxy {
+
+		@Override
+		public Object writeReplace() {
+			return null;
+		}
+
+		@Override
+		public LazyInitializer getHibernateLazyInitializer() {
+			return null;
+		}
+	}
 }