diff --git a/javaxval/src/main/java/org/baeldung/Customer.java b/javaxval/src/main/java/org/baeldung/Customer.java
index 02a95cc546..f7f4a27b4a 100644
--- a/javaxval/src/main/java/org/baeldung/Customer.java
+++ b/javaxval/src/main/java/org/baeldung/Customer.java
@@ -20,6 +20,7 @@ public class Customer {
     @PositiveOrZero
     private OptionalInt numberOfOrders;
 
+    @NotBlank
     private Profile profile;
 
     public String getName() {
diff --git a/javaxval/src/test/java/org/baeldung/ContainerValidationIntegrationTest.java b/javaxval/src/test/java/org/baeldung/ContainerValidationIntegrationTest.java
index aa2cf577de..afa7c0c16c 100644
--- a/javaxval/src/test/java/org/baeldung/ContainerValidationIntegrationTest.java
+++ b/javaxval/src/test/java/org/baeldung/ContainerValidationIntegrationTest.java
@@ -76,7 +76,7 @@ public class ContainerValidationIntegrationTest {
         assertEquals(0, violations.size());
     }
 
-    // @Test
+    @Test
     public void whenProfileCompanyNameBlank_thenValidationFails() {
         Customer customer = new Customer();
         customer.setName("John");
diff --git a/javaxval/src/test/java/org/baeldung/javabeanconstraints/bigdecimal/InvoiceUnitTest.java b/javaxval/src/test/java/org/baeldung/javabeanconstraints/bigdecimal/InvoiceUnitTest.java
index a07328e2fb..50206259ae 100644
--- a/javaxval/src/test/java/org/baeldung/javabeanconstraints/bigdecimal/InvoiceUnitTest.java
+++ b/javaxval/src/test/java/org/baeldung/javabeanconstraints/bigdecimal/InvoiceUnitTest.java
@@ -3,6 +3,7 @@ package org.baeldung.javabeanconstraints.bigdecimal;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import java.math.BigDecimal;
+import java.util.Locale;
 import java.util.Set;
 
 import javax.validation.ConstraintViolation;
@@ -18,6 +19,8 @@ public class InvoiceUnitTest {
 
     @BeforeClass
     public static void setupValidatorInstance() {
+        Locale.setDefault(Locale.US);
+
         validator = Validation.buildDefaultValidatorFactory()
             .getValidator();
     }
diff --git a/javaxval/src/test/java/org/baeldung/javabeanconstraints/validationgroup/RegistrationFormUnitTest.java b/javaxval/src/test/java/org/baeldung/javabeanconstraints/validationgroup/RegistrationFormUnitTest.java
index efe61bf926..e0b1aa7bf8 100644
--- a/javaxval/src/test/java/org/baeldung/javabeanconstraints/validationgroup/RegistrationFormUnitTest.java
+++ b/javaxval/src/test/java/org/baeldung/javabeanconstraints/validationgroup/RegistrationFormUnitTest.java
@@ -2,6 +2,7 @@ package org.baeldung.javabeanconstraints.validationgroup;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import java.util.Locale;
 import java.util.Set;
 
 import javax.validation.ConstraintViolation;
@@ -16,6 +17,8 @@ public class RegistrationFormUnitTest {
 
     @BeforeClass
     public static void setupValidatorInstance() {
+        Locale.setDefault(Locale.US);
+
         validator = Validation.buildDefaultValidatorFactory()
             .getValidator();
     }