Log warning when open-in-view is implicitly enabled for JPA or Neo4j

Closes spring-projectsgh-7107

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.java

@@ -18,6 +18,8 @@
 
 import java.util.List;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.neo4j.ogm.session.SessionFactory;
 import org.neo4j.ogm.session.event.EventListener;
 
@@ -117,8 +119,23 @@ protected static class Neo4jWebConfiguration {
 		@Configuration
 		protected static class Neo4jWebMvcConfiguration implements WebMvcConfigurer {
 
+			private static final Log logger = LogFactory
+					.getLog(Neo4jWebMvcConfiguration.class);
+
+			private final Neo4jProperties neo4jProperties;
+
+			protected Neo4jWebMvcConfiguration(Neo4jProperties neo4jProperties) {
+				this.neo4jProperties = neo4jProperties;
+			}
+
 			@Bean
 			public OpenSessionInViewInterceptor neo4jOpenSessionInViewInterceptor() {
+				if (this.neo4jProperties.getOpenInView() == null) {
+					logger.warn("spring.data.neo4j.open-in-view is enabled by default."
+							+ "Therefore, database queries may be performed during view "
+							+ "rendering. Explicitly configure "
+							+ "spring.data.neo4j.open-in-view to disable this warning");
+				}
 				return new OpenSessionInViewInterceptor();
 			}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jProperties.java

@@ -66,6 +66,12 @@ public class Neo4jProperties implements ApplicationContextAware {
 	 */
 	private AutoIndexMode autoIndex = AutoIndexMode.NONE;
 
+	/**
+	 * Register OpenSessionInViewInterceptor. Binds a Neo4j Session to the thread for the
+	 * entire processing of the request.",
+	 */
+	private Boolean openInView;
+
 	private final Embedded embedded = new Embedded();
 
 	private ClassLoader classLoader = Neo4jProperties.class.getClassLoader();
@@ -102,6 +108,14 @@ public void setAutoIndex(AutoIndexMode autoIndex) {
 		this.autoIndex = autoIndex;
 	}
 
+	public Boolean getOpenInView() {
+		return this.openInView;
+	}
+
+	public void setOpenInView(Boolean openInView) {
+		this.openInView = openInView;
+	}
+
 	public Embedded getEmbedded() {
 		return this.embedded;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaBaseConfiguration.java

@@ -22,6 +22,9 @@
 import javax.persistence.EntityManagerFactory;
 import javax.sql.DataSource;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
@@ -214,8 +217,23 @@ protected static class JpaWebConfiguration {
 		@Configuration
 		protected static class JpaWebMvcConfiguration implements WebMvcConfigurer {
 
+			private static final Log logger = LogFactory
+					.getLog(JpaWebMvcConfiguration.class);
+
+			private final JpaProperties jpaProperties;
+
+			protected JpaWebMvcConfiguration(JpaProperties jpaProperties) {
+				this.jpaProperties = jpaProperties;
+			}
+
 			@Bean
 			public OpenEntityManagerInViewInterceptor openEntityManagerInViewInterceptor() {
+				if (this.jpaProperties.getOpenInView() == null) {
+					logger.warn("spring.jpa.open-in-view is enabled by default. "
+							+ "Therefore, database queries may be performed during view "
+							+ "rendering. Explicitly configure "
+							+ "spring.jpa.open-in-view to disable this warning");
+				}
 				return new OpenEntityManagerInViewInterceptor();
 			}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaProperties.java

@@ -72,6 +72,12 @@ public class JpaProperties {
 	 */
 	private boolean showSql = false;
 
+	/**
+	 * Register OpenEntityManagerInViewInterceptor. Binds a JPA EntityManager to the
+	 * thread for the entire processing of the request.
+	 */
+	private Boolean openInView;
+
 	private Hibernate hibernate = new Hibernate();
 
 	public Map<String, String> getProperties() {
@@ -118,6 +124,14 @@ public void setShowSql(boolean showSql) {
 		this.showSql = showSql;
 	}
 
+	public Boolean getOpenInView() {
+		return this.openInView;
+	}
+
+	public void setOpenInView(Boolean openInView) {
+		this.openInView = openInView;
+	}
+
 	public Hibernate getHibernate() {
 		return this.hibernate;
 	}

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -145,12 +145,6 @@
     "description": "Enable Mongo repositories.",
     "defaultValue": true
   },
-  {
-    "name": "spring.data.neo4j.open-in-view",
-    "type": "java.lang.Boolean",
-    "description": "Register OpenSessionInViewInterceptor. Binds a Neo4j Session to the thread for the entire processing of the request.",
-    "defaultValue": false
-  },
   {
     "name": "spring.data.neo4j.repositories.enabled",
     "type": "java.lang.Boolean",
@@ -227,12 +221,6 @@
     "description": "MBeanServer bean name.",
     "defaultValue": "mbeanServer"
   },
-  {
-    "name": "spring.jpa.open-in-view",
-    "type": "java.lang.Boolean",
-    "description": "Register OpenEntityManagerInViewInterceptor. Binds a JPA EntityManager to the thread for the entire processing of the request.",
-    "defaultValue": true
-  },
   {
     "name": "spring.jta.enabled",
     "type": "java.lang.Boolean",

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -3723,7 +3723,7 @@ By default, if you are running a web application, the session is bound to the th
 the entire processing of the request (i.e. the "Open Session in View" pattern). If you
 don't want this behavior add the following to your `application.properties`:
 
-
+[source,properties,indent=0]
 ----
 	spring.data.neo4j.open-in-view=false
 ----

spring-boot-samples/spring-boot-sample-data-jpa/src/main/resources/application.properties

@@ -1,3 +1,3 @@
 spring.h2.console.enabled=true
-
+spring.jpa.open-in-view=true
 logging.level.org.hibernate.SQL=debug

spring-boot-samples/spring-boot-sample-data-neo4j/src/main/resources/application.properties

@@ -0,0 +1 @@
+# spring.data.neo4j.open-in-view=true

spring-boot-samples/spring-boot-sample-flyway/src/main/resources/application.properties

@@ -1,5 +1,4 @@
 endpoints.flyway.web.enabled=true
-
 spring.jpa.hibernate.ddl-auto=validate
-
-spring.h2.console.enabled=true
+spring.jpa.open-in-view=true
+spring.h2.console.enabled=true

spring-boot-samples/spring-boot-sample-jpa/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.jpa.open-in-view=true

spring-boot-samples/spring-boot-sample-jta-atomikos/src/main/resources/application.properties

@@ -1,2 +1,3 @@
 logging.level.com.atomikos=WARN
-spring.artemis.embedded.queues=accounts
+spring.artemis.embedded.queues=accounts
+spring.jpa.open-in-view=true

spring-boot-samples/spring-boot-sample-jta-bitronix/src/main/resources/application.properties

@@ -1 +1,2 @@
-spring.artemis.embedded.queues=accounts
+spring.artemis.embedded.queues=accounts
+spring.jpa.open-in-view=true

spring-boot-samples/spring-boot-sample-jta-jndi/src/main/resources/application.properties

@@ -1,2 +1,3 @@
-spring.jpa.generate-ddl=true
 spring.datasource.jndi-name=java:jboss/datasources/bootdemo
+spring.jpa.generate-ddl=true
+spring.jpa.open-in-view=true

spring-boot-samples/spring-boot-sample-jta-narayana/src/main/resources/application.properties

@@ -1,2 +1,3 @@
+logging.level.com.arjuna=INFO
 spring.artemis.embedded.queues=accounts
-logging.level.com.arjuna=INFO
+spring.jpa.open-in-view=true

spring-boot-samples/spring-boot-sample-test/src/main/resources/application.properties

@@ -1 +1,2 @@
 spring.datasource.url=jdbc:mysql://localhost/doesnotexist
+spring.jpa.open-in-view=true