diff --git a/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/MyMessageInterpolator.java b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/MyMessageInterpolator.java
new file mode 100644
index 0000000000..efa3d62b88
--- /dev/null
+++ b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/MyMessageInterpolator.java
@@ -0,0 +1,29 @@
+package com.baeldung.interpolation;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import javax.validation.MessageInterpolator;
+import java.util.Locale;
+
+public class MyMessageInterpolator implements MessageInterpolator {
+
+    private static Logger logger = LoggerFactory.getLogger(MyMessageInterpolator.class);
+
+    private final MessageInterpolator defaultInterpolator;
+
+    public MyMessageInterpolator(MessageInterpolator interpolator) {
+        this.defaultInterpolator = interpolator;
+    }
+
+    @Override
+    public String interpolate(String messageTemplate, Context context) {
+        messageTemplate = messageTemplate.toUpperCase();
+        return defaultInterpolator.interpolate(messageTemplate, context, Locale.getDefault());
+    }
+
+    @Override
+    public String interpolate(String messageTemplate, Context context, Locale locale) {
+        messageTemplate = messageTemplate.toUpperCase();
+        return defaultInterpolator.interpolate(messageTemplate, context, locale);
+    }
+}
diff --git a/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/NotNullRequest.java b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/NotNullRequest.java
new file mode 100644
index 0000000000..9a2b00be8f
--- /dev/null
+++ b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/NotNullRequest.java
@@ -0,0 +1,17 @@
+package com.baeldung.interpolation;
+
+import javax.validation.constraints.NotNull;
+
+public class NotNullRequest {
+
+    @NotNull(message = "stringValue has to be present")
+    private String stringValue;
+
+    public String getStringValue() {
+        return stringValue;
+    }
+
+    public void setStringValue(String stringValue) {
+        this.stringValue = stringValue;
+    }
+}
diff --git a/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationController.java b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationController.java
new file mode 100644
index 0000000000..3fed170fdf
--- /dev/null
+++ b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationController.java
@@ -0,0 +1,15 @@
+package com.baeldung.interpolation;
+
+import javax.validation.Valid;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class ValidationController {
+
+    @PostMapping("/test-not-null")
+    public void testNotNull(@Valid @RequestBody NotNullRequest request) {
+
+    }
+}
diff --git a/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationExamples.java b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationExamples.java
new file mode 100644
index 0000000000..6c9b924200
--- /dev/null
+++ b/spring-mvc-simple-2/src/main/java/com/baeldung/interpolation/ValidationExamples.java
@@ -0,0 +1,31 @@
+package com.baeldung.interpolation;
+
+import java.util.Formatter;
+import javax.validation.constraints.Size;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.DecimalMin;
+
+public class ValidationExamples {
+
+    private static final Formatter formatter = new Formatter();
+
+    @Size(
+      min = 5,
+      max = 14,
+      message = "The author email '${validatedValue}' must be between {min} and {max} characters long"
+    )
+    private String authorEmail;
+
+    @Min(
+      value = 1,
+      message = "There must be at least {value} test{value > 1 ? 's' : ''} in the test case"
+    )
+    private int testCount;
+
+    @DecimalMin(
+      value = "50",
+      message = "The code coverage ${formatter.format('%1$.2f', validatedValue)} must be higher than {value}%"
+    )
+    private double codeCoverage;
+
+}