DataConfig.java

package org.springframework.issues.config;

import java.util.Collections;

import javax.persistence.EntityManagerFactory;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.web.config.EnableSpringDataWebSupport;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableJpaRepositories(basePackages = "org.springframework.issues.domain")
@EnableTransactionManagement
@EnableSpringDataWebSupport
public class DataConfig {

	@Bean
	public EntityManagerFactory entityManagerFactory() {

		HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
		vendorAdapter.setGenerateDdl(true);

		LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
		factory.setJpaVendorAdapter(vendorAdapter);
		factory.setPackagesToScan("org.springframework.issues.domain");
		factory.setDataSource(h2Database());
		factory.setJpaPropertyMap(Collections.singletonMap("hibernate.show_sql", "true"));
		factory.afterPropertiesSet();

		return factory.getObject();
	}

	@Bean
	public PlatformTransactionManager transactionManager() {

		JpaTransactionManager txManager = new JpaTransactionManager();
		txManager.setEntityManagerFactory(entityManagerFactory());
		return txManager;
	}

	@Bean
	public EmbeddedDatabase h2Database() {
		return new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.H2).build();
	}
}