Bael 5123: uncomment @NotBlank annotation (#11788)

* revert: comment Hibernate Validator AP dependency

See http://jira.baeldung.com/browse/BAEL-5123

* revert: restore @NotBlank annotation

See http://jira.baeldung.com/browse/BAEL-5123

javaxval/pom.xml

@@ -36,6 +36,8 @@
         </dependency>
     </dependencies>
 
+    <!-- uncomment in order to enable Hibernate Validator Anotation Processor -->
+    <!--
     <build>
         <plugins>
             <plugin>
@@ -63,6 +65,8 @@
         </plugins>
     </build>
 
+    -->
+
     <properties>
         <hibernate-validator.version>6.0.13.Final</hibernate-validator.version>
         <hibernate-validator.ap.version>6.2.0.Final</hibernate-validator.ap.version>

javaxval/src/main/java/com/baeldung/javaxval/container/validation/Customer.java

@@ -20,6 +20,7 @@ public class Customer {
     @PositiveOrZero
     private OptionalInt numberOfOrders;
 
+    @NotBlank
     private Profile profile;
 
     public String getName() {