xml configuration working as well

spring-jpa/src/main/java/org/baeldung/spring/PersistenceJPAConfig.java

@@ -7,13 +7,11 @@ import javax.sql.DataSource;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
-import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.core.env.Environment;
 import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
 import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.orm.jpa.JpaTransactionManager;
-import org.springframework.orm.jpa.JpaVendorAdapter;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.transaction.PlatformTransactionManager;
@@ -21,7 +19,7 @@ import org.springframework.transaction.annotation.EnableTransactionManagement;
 
 import com.google.common.base.Preconditions;
 
-@Configuration
+// @Configuration
 @EnableTransactionManagement
 @PropertySource({ "classpath:persistence-mysql.properties" })
 @ComponentScan({ "org.baeldung.persistence" })
@@ -36,19 +34,20 @@ public class PersistenceJPAConfig {
 
     @Bean
     public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
-        final LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
-        factoryBean.setDataSource(restDataSource());
-        factoryBean.setPackagesToScan(new String[] { "org.baeldung.persistence.model" });
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(dataSource());
+        em.setPackagesToScan(new String[] { "org.baeldung.persistence.model" });
 
-        final JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
-        factoryBean.setJpaVendorAdapter(vendorAdapter);
-        factoryBean.setJpaProperties(additionalProperties());
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        // vendorAdapter.set
+        em.setJpaVendorAdapter(vendorAdapter);
+        em.setJpaProperties(additionalProperties());
 
-        return factoryBean;
+        return em;
     }
 
     @Bean
-    public DataSource restDataSource() {
+    public DataSource dataSource() {
         final DriverManagerDataSource dataSource = new DriverManagerDataSource();
         dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
         dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));

spring-jpa/src/main/java/org/baeldung/spring/PersistenceJPAConfigXml.java

@@ -1,10 +1,11 @@
 package org.baeldung.spring;
 
 import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.ImportResource;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
-// @Configuration
+@Configuration
 @EnableTransactionManagement
 @ComponentScan({ "org.baeldung.persistence" })
 @ImportResource({ "classpath:jpaConfig.xml" })