config fix

spring-hibernate4-dao/src/main/java/org/baeldung/spring/persistence/config/PersistenceConfig.java

@@ -69,6 +69,8 @@ public class PersistenceConfig {
         return new Properties() {
             {
                 setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+                setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
+
                 // setProperty("hibernate.globally_quoted_identifiers", "true");
                 // note: necessary in launchpad-storage, but causing problems here
             }