Avoid custom properties processing

EntityManagerFactoryBuilder does not currently use the JpaProperties to
initialize the `ddl-auto` and `naming-strategy` parameter automatically.

We can remove that customization. In that case, we have to specify the
`ddl-auto` flag explicitly as the code that auto-detects the value based
 on the database type is not executed anymore.

src/main/java/demo/customer/CustomerConfig.java

@@ -7,7 +7,6 @@
 
 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilder;
-import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -33,12 +32,11 @@ public DataSource customerDataSource() {
 
 	@Bean
 	public LocalContainerEntityManagerFactoryBean customerEntityManager(
-			EntityManagerFactoryBuilder builder, JpaProperties jpaProperties) {
+			EntityManagerFactoryBuilder builder) {
 		return builder
 				.dataSource(customerDataSource())
 				.packages(Customer.class)
 				.persistenceUnit("customers")
-				.properties(jpaProperties.getHibernateProperties(customerDataSource()))
 				.build();
 	}
 

src/main/java/demo/order/OrderConfig.java

@@ -7,7 +7,6 @@
 
 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilder;
-import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -30,12 +29,11 @@ public DataSource orderDataSource() {
 
 	@Bean
 	public LocalContainerEntityManagerFactoryBean orderEntityManager(
-			EntityManagerFactoryBuilder builder, JpaProperties jpaProperties) {
+			EntityManagerFactoryBuilder builder) {
 		return builder
 				.dataSource(orderDataSource())
 				.packages(Order.class)
 				.persistenceUnit("orders")
-				.properties(jpaProperties.getHibernateProperties(orderDataSource()))
 				.build();
 	}
 

src/main/resources/application.properties

@@ -1,3 +1,5 @@
+spring.jpa.properties.hibernate.hbm2ddl.auto=create
+
 app.customer.datasource.url=jdbc:h2:mem:customers;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
 app.customer.datasource.driver-class-name=org.h2.Driver