Add missing @Nullable annotations on parameters

Issue: SPR-15540

spring-orm/src/main/java/org/springframework/orm/hibernate5/support/OpenSessionInViewInterceptor.java

@@ -25,6 +25,7 @@ import org.hibernate.SessionFactory;
 
 import org.springframework.dao.DataAccessException;
 import org.springframework.dao.DataAccessResourceFailureException;
+import org.springframework.lang.Nullable;
 import org.springframework.orm.hibernate5.SessionFactoryUtils;
 import org.springframework.orm.hibernate5.SessionHolder;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
@@ -130,7 +131,7 @@ public class OpenSessionInViewInterceptor implements AsyncWebRequestInterceptor
 	}
 
 	@Override
-	public void postHandle(WebRequest request, ModelMap model) {
+	public void postHandle(WebRequest request, @Nullable ModelMap model) {
 	}
 
 	/**
@@ -138,7 +139,7 @@ public class OpenSessionInViewInterceptor implements AsyncWebRequestInterceptor
 	 * @see TransactionSynchronizationManager
 	 */
 	@Override
-	public void afterCompletion(WebRequest request, Exception ex) throws DataAccessException {
+	public void afterCompletion(WebRequest request, @Nullable Exception ex) throws DataAccessException {
 		if (!decrementParticipateCount(request)) {
 			SessionHolder sessionHolder =
 					(SessionHolder) TransactionSynchronizationManager.unbindResource(getSessionFactory());

spring-orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java

@@ -300,7 +300,7 @@ public abstract class AbstractEntityManagerFactoryBean implements
 	}
 
 	@Override
-	public void setBeanClassLoader(ClassLoader classLoader) {
+	public void setBeanClassLoader(@Nullable ClassLoader classLoader) {
 		this.beanClassLoader = classLoader;
 	}
 

spring-orm/src/main/java/org/springframework/orm/jpa/DefaultJpaDialect.java

@@ -23,6 +23,7 @@ import javax.persistence.PersistenceException;
 
 import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.datasource.ConnectionHandle;
+import org.springframework.lang.Nullable;
 import org.springframework.transaction.InvalidIsolationLevelException;
 import org.springframework.transaction.TransactionDefinition;
 import org.springframework.transaction.TransactionException;
@@ -81,7 +82,7 @@ public class DefaultJpaDialect implements JpaDialect, Serializable {
 	 * @see #beginTransaction
 	 */
 	@Override
-	public void cleanupTransaction(Object transactionData) {
+	public void cleanupTransaction(@Nullable Object transactionData) {
 	}
 
 	/**

spring-orm/src/main/java/org/springframework/orm/jpa/support/OpenEntityManagerInViewInterceptor.java

@@ -21,6 +21,7 @@ import javax.persistence.PersistenceException;
 
 import org.springframework.dao.DataAccessException;
 import org.springframework.dao.DataAccessResourceFailureException;
+import org.springframework.lang.Nullable;
 import org.springframework.orm.jpa.EntityManagerFactoryAccessor;
 import org.springframework.orm.jpa.EntityManagerFactoryUtils;
 import org.springframework.orm.jpa.EntityManagerHolder;
@@ -99,11 +100,11 @@ public class OpenEntityManagerInViewInterceptor extends EntityManagerFactoryAcce
 	}
 
 	@Override
-	public void postHandle(WebRequest request, ModelMap model) {
+	public void postHandle(WebRequest request, @Nullable ModelMap model) {
 	}
 
 	@Override
-	public void afterCompletion(WebRequest request, Exception ex) throws DataAccessException {
+	public void afterCompletion(WebRequest request, @Nullable Exception ex) throws DataAccessException {
 		if (!decrementParticipateCount(request)) {
 			EntityManagerHolder emHolder = (EntityManagerHolder)
 					TransactionSynchronizationManager.unbindResource(getEntityManagerFactory());

spring-orm/src/main/java/org/springframework/orm/jpa/vendor/HibernateJpaDialect.java

@@ -200,7 +200,7 @@ public class HibernateJpaDialect extends DefaultJpaDialect {
 	}
 
 	@Override
-	public void cleanupTransaction(Object transactionData) {
+	public void cleanupTransaction(@Nullable Object transactionData) {
 		((SessionTransactionData) transactionData).resetSessionState();
 	}