Fix overridden methods nullability

Issue: SPR-15869

spring-orm/src/main/java/org/springframework/orm/hibernate5/HibernateExceptionTranslator.java

@@ -22,6 +22,7 @@ import org.hibernate.HibernateException;
 
 import org.springframework.dao.DataAccessException;
 import org.springframework.dao.support.PersistenceExceptionTranslator;
+import org.springframework.lang.Nullable;
 import org.springframework.orm.jpa.EntityManagerFactoryUtils;
 
 /**
@@ -44,6 +45,7 @@ import org.springframework.orm.jpa.EntityManagerFactoryUtils;
 public class HibernateExceptionTranslator implements PersistenceExceptionTranslator {
 
 	@Override
+	@Nullable
 	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
 		if (ex instanceof HibernateException) {
 			return convertHibernateAccessException((HibernateException) ex);

spring-orm/src/main/java/org/springframework/orm/hibernate5/HibernateTemplate.java

@@ -328,6 +328,7 @@ public class HibernateTemplate implements HibernateOperations, InitializingBean
 
 
 	@Override
+	@Nullable
 	public <T> T execute(HibernateCallback<T> action) throws DataAccessException {
 		return doExecute(action, false);
 	}
@@ -453,11 +454,13 @@ public class HibernateTemplate implements HibernateOperations, InitializingBean
 	//-------------------------------------------------------------------------
 
 	@Override
+	@Nullable
 	public <T> T get(Class<T> entityClass, Serializable id) throws DataAccessException {
 		return get(entityClass, id, null);
 	}
 
 	@Override
+	@Nullable
 	public <T> T get(final Class<T> entityClass, final Serializable id, @Nullable final LockMode lockMode)
 			throws DataAccessException {
 
@@ -472,11 +475,13 @@ public class HibernateTemplate implements HibernateOperations, InitializingBean
 	}
 
 	@Override
+	@Nullable
 	public Object get(String entityName, Serializable id) throws DataAccessException {
 		return get(entityName, id, null);
 	}
 
 	@Override
+	@Nullable
 	public Object get(final String entityName, final Serializable id, @Nullable final LockMode lockMode)
 			throws DataAccessException {
 

spring-orm/src/main/java/org/springframework/orm/hibernate5/LocalSessionFactoryBean.java

@@ -549,6 +549,7 @@ public class LocalSessionFactoryBean extends HibernateExceptionTranslator
 
 
 	@Override
+	@Nullable
 	public SessionFactory getObject() {
 		return this.sessionFactory;
 	}

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

@@ -495,6 +495,7 @@ public abstract class AbstractEntityManagerFactoryBean implements
 	 * @see EntityManagerFactoryUtils#convertJpaAccessExceptionIfPossible
 	 */
 	@Override
+	@Nullable
 	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
 		return (this.jpaDialect != null ? this.jpaDialect.translateExceptionIfPossible(ex) :
 				EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(ex));
@@ -522,11 +523,13 @@ public abstract class AbstractEntityManagerFactoryBean implements
 	}
 
 	@Override
+	@Nullable
 	public PersistenceUnitInfo getPersistenceUnitInfo() {
 		return null;
 	}
 
 	@Override
+	@Nullable
 	public DataSource getDataSource() {
 		return null;
 	}
@@ -536,6 +539,7 @@ public abstract class AbstractEntityManagerFactoryBean implements
 	 * Return the singleton EntityManagerFactory.
 	 */
 	@Override
+	@Nullable
 	public EntityManagerFactory getObject() {
 		return this.entityManagerFactory;
 	}

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

@@ -57,6 +57,7 @@ public class DefaultJpaDialect implements JpaDialect, Serializable {
 	 * @see #cleanupTransaction
 	 */
 	@Override
+	@Nullable
 	public Object beginTransaction(EntityManager entityManager, TransactionDefinition definition)
 			throws PersistenceException, SQLException, TransactionException {
 
@@ -70,6 +71,7 @@ public class DefaultJpaDialect implements JpaDialect, Serializable {
 	}
 
 	@Override
+	@Nullable
 	public Object prepareTransaction(EntityManager entityManager, boolean readOnly, @Nullable String name)
 			throws PersistenceException {
 
@@ -90,6 +92,7 @@ public class DefaultJpaDialect implements JpaDialect, Serializable {
 	 * indicating that no JDBC Connection can be provided.
 	 */
 	@Override
+	@Nullable
 	public ConnectionHandle getJdbcConnection(EntityManager entityManager, boolean readOnly)
 			throws PersistenceException, SQLException {
 
@@ -119,6 +122,7 @@ public class DefaultJpaDialect implements JpaDialect, Serializable {
 	 * @see EntityManagerFactoryUtils#convertJpaAccessExceptionIfPossible
 	 */
 	@Override
+	@Nullable
 	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
 		return EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(ex);
 	}

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

@@ -400,6 +400,7 @@ public class LocalContainerEntityManagerFactoryBean extends AbstractEntityManage
 	}
 
 	@Override
+	@Nullable
 	public String getPersistenceUnitName() {
 		if (this.persistenceUnitInfo != null) {
 			return this.persistenceUnitInfo.getPersistenceUnitName();

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

@@ -109,6 +109,7 @@ public class SharedEntityManagerBean extends EntityManagerFactoryAccessor
 
 
 	@Override
+	@Nullable
 	public EntityManager getObject() {
 		return this.shared;
 	}

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

@@ -118,16 +118,19 @@ public abstract class AbstractJpaVendorAdapter implements JpaVendorAdapter {
 
 
 	@Override
+	@Nullable
 	public String getPersistenceProviderRootPackage() {
 		return null;
 	}
 
 	@Override
+	@Nullable
 	public Map<String, ?> getJpaPropertyMap() {
 		return null;
 	}
 
 	@Override
+	@Nullable
 	public JpaDialect getJpaDialect() {
 		return null;
 	}

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

@@ -72,6 +72,7 @@ public class EclipseLinkJpaDialect extends DefaultJpaDialect {
 
 
 	@Override
+	@Nullable
 	public Object beginTransaction(EntityManager entityManager, TransactionDefinition definition)
 			throws PersistenceException, SQLException, TransactionException {
 

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

@@ -216,6 +216,7 @@ public class HibernateJpaDialect extends DefaultJpaDialect {
 	}
 
 	@Override
+	@Nullable
 	public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
 		if (ex instanceof HibernateException) {
 			return convertHibernateAccessException((HibernateException) ex);

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

@@ -22,6 +22,7 @@ import javax.persistence.EntityManagerFactory;
 import org.hibernate.SessionFactory;
 
 import org.springframework.beans.factory.FactoryBean;
+import org.springframework.lang.Nullable;
 import org.springframework.orm.jpa.EntityManagerFactoryAccessor;
 import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
@@ -41,6 +42,7 @@ import org.springframework.util.ReflectionUtils;
 public class HibernateJpaSessionFactoryBean extends EntityManagerFactoryAccessor implements FactoryBean<SessionFactory> {
 
 	@Override
+	@Nullable
 	public SessionFactory getObject() {
 		EntityManagerFactory emf = getEntityManagerFactory();
 		Assert.state(emf != null, "EntityManagerFactory must not be null");