diff --git a/openapi-generator/src/main/java/io/micronaut/openapi/generator/Utils.java b/openapi-generator/src/main/java/io/micronaut/openapi/generator/Utils.java
index cbb5ae1217..9053bd90d4 100644
--- a/openapi-generator/src/main/java/io/micronaut/openapi/generator/Utils.java
+++ b/openapi-generator/src/main/java/io/micronaut/openapi/generator/Utils.java
@@ -156,20 +156,34 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
             return result.toString();
         }
 
+        var patternMsg = (String) prop.vendorExtensions.get("x-pattern-message");
+        var sizeMsg = (String) prop.vendorExtensions.get("x-size-message");
+        var notNullMsg = (String) prop.vendorExtensions.get("x-not-null-message");
+        var minMsg = (String) prop.vendorExtensions.get("x-min-message");
+        var maxMsg = (String) prop.vendorExtensions.get("x-max-message");
+
         if (StringUtils.isNotEmpty(prop.pattern) && !prop.isDate && !prop.isDateTime) {
-            if (prop.isEmail) {
+            if ("email".equals(type) || "email".equalsIgnoreCase(prop.dataFormat) || prop.isEmail) {
                 result.append("@Email(regexp = \"");
             } else {
                 result.append("@Pattern(regexp = \"");
             }
-            result.append(prop.pattern).append("\") ");
+            result.append(prop.pattern).append("\"");
+            if (patternMsg != null) {
+                result.append(", message = \"").append(patternMsg).append("\"");
+            }
+            result.append(") ");
         }
 
         var containsNotEmpty = false;
 
         if (prop.minLength != null || prop.maxLength != null) {
             if (prop.minLength != null && prop.minLength == 1 && prop.maxLength == null && !prop.isNullable) {
-                result.append("@NotEmpty ");
+                result.append("@NotEmpty");
+                if (sizeMsg != null) {
+                    result.append("(message = \"").append(sizeMsg).append("\")");
+                }
+                result.append(' ');
                 containsNotEmpty = true;
             } else {
                 result.append("@Size(");
@@ -182,6 +196,9 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
                     }
                     result.append("max = ").append(prop.maxLength);
                 }
+                if (sizeMsg != null) {
+                    result.append(", message = \"").append(sizeMsg).append('"');
+                }
                 result.append(") ");
             }
         }
@@ -201,6 +218,9 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
                     }
                     result.append("max = ").append(prop.maxItems);
                 }
+                if (sizeMsg != null) {
+                    result.append(", message = \"").append(sizeMsg).append('"');
+                }
                 result.append(") ");
             }
         }
@@ -212,7 +232,11 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
                     result.append("@Nullable ");
                 }
             } else if (!containsNotEmpty) {
-                result.append("@NotNull ");
+                result.append("@NotNull");
+                if (notNullMsg != null) {
+                    result.append("(message = \"").append(notNullMsg).append("\")");
+                }
+                result.append(" ");
             }
         }
         if (StringUtils.isNotEmpty(prop.minimum)) {
@@ -222,21 +246,43 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
                     longNumber++;
                 }
                 if (longNumber == 0 && StringUtils.isEmpty(prop.maximum)) {
-                    result.append("@PositiveOrZero ");
+                    result.append("@PositiveOrZero");
+                    if (minMsg != null) {
+                        result.append("(message = \"").append(minMsg).append("\")");
+                    }
+                    result.append(" ");
                 } else if (longNumber == 1 && StringUtils.isEmpty(prop.maximum)) {
-                    result.append("@Positive ");
+                    result.append("@Positive");
+                    if (minMsg != null) {
+                        result.append("(message = \"").append(minMsg).append("\")");
+                    }
+                    result.append(" ");
                 } else {
-                    result.append("@Min(").append(longNumber).append(") ");
+                    result.append("@Min(");
+                    if (minMsg != null) {
+                        result.append("value = ");
+                    }
+                    result.append(longNumber);
+                    if (prop.isLong) {
+                        result.append("L");
+                    }
+                    if (minMsg != null) {
+                        result.append(", message = \"").append(minMsg).append("\"");
+                    }
+                    result.append(") ");
                 }
             } catch (Exception e) {
                 result.append("@DecimalMin(");
-                if (prop.exclusiveMinimum) {
+                if (prop.exclusiveMinimum || minMsg != null) {
                     result.append("value = ");
                 }
                 result.append('"').append(prop.minimum).append('"');
                 if (prop.exclusiveMinimum) {
                     result.append(", inclusive = false");
                 }
+                if (minMsg != null) {
+                    result.append(", message = \"").append(minMsg).append("\"");
+                }
                 result.append(") ");
             }
         }
@@ -247,21 +293,44 @@ private static String genericAnnotations(CodegenProperty prop, boolean isGenerat
                     longNumber--;
                 }
                 if (longNumber == 0 && StringUtils.isEmpty(prop.minimum)) {
-                    result.append("@NegativeOrZero ");
+                    result.append("@NegativeOrZero");
+                    if (maxMsg != null) {
+                        result.append("(message = \"").append(maxMsg).append("\")");
+                    }
+                    result.append(" ");
                 } else if (longNumber == -1 && StringUtils.isEmpty(prop.minimum)) {
-                    result.append("@Negative ");
+                    result.append("@Negative");
+                    if (maxMsg != null) {
+                        result.append("(message = \"").append(maxMsg).append("\")");
+                    }
+                    result.append(" ");
                 } else {
-                    result.append("@Max(").append(longNumber).append(") ");
+                    result.append("@Max(");
+                    if (maxMsg != null) {
+                        result.append("value = ");
+                    }
+                    result.append(longNumber);
+                    if (prop.isLong) {
+                        result.append("L");
+                    }
+                    if (maxMsg != null) {
+                        result.append(", message = \"").append(maxMsg).append("\"");
+                    }
+                    result.append(") ");
+
                 }
             } catch (Exception e) {
                 result.append("@DecimalMax(");
-                if (prop.exclusiveMaximum) {
+                if (prop.exclusiveMaximum || maxMsg != null) {
                     result.append("value = ");
                 }
                 result.append('"').append(prop.maximum).append('"');
                 if (prop.exclusiveMaximum) {
                     result.append(", inclusive = false");
                 }
+                if (maxMsg != null) {
+                    result.append(", message = \"").append(maxMsg).append("\"");
+                }
                 result.append(") ");
             }
         }
diff --git a/openapi-generator/src/main/resources/templates/java-micronaut/common/params/validation.mustache b/openapi-generator/src/main/resources/templates/java-micronaut/common/params/validation.mustache
index c444e128f2..6e80ee2217 100644
--- a/openapi-generator/src/main/resources/templates/java-micronaut/common/params/validation.mustache
+++ b/openapi-generator/src/main/resources/templates/java-micronaut/common/params/validation.mustache
@@ -37,7 +37,7 @@
     {{^isNullable}}
         {{#required}}
             {{^isReadOnly}}
-    @NotNull
+    @NotNull{{#vendorExtensions.x-not-null-message}}(message = "{{{.}}}"){{/vendorExtensions.x-not-null-message}}
             {{/isReadOnly}}
         {{/required}}
     {{/isNullable}}
@@ -51,62 +51,62 @@
     {{!Pattern}}
     {{#pattern}}
         {{^isByteArray}}{{^isDate}}{{^isDateTime}}{{^isEmail}}
-    @Pattern(regexp = "{{{pattern}}}")
+    @Pattern(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}})
         {{/isEmail}}{{/isDateTime}}{{/isDate}}{{/isByteArray}}
     {{/pattern}}
     {{!Min length && max length}}
     {{#minLength}}
         {{#maxLength}}
-    @Size(min = {{minLength}}, max = {{maxLength}})
+    @Size(min = {{minLength}}, max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
         {{/maxLength}}
     {{/minLength}}
     {{#minLength}}{{^maxLength}}
-    @Size(min = {{minLength}})
+    @Size(min = {{minLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{^minLength}}{{#maxLength}}
-    @Size(max = {{maxLength}})
+    @Size(max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{!Size}}
     {{#minItems}}{{#maxItems}}
-    @Size(min = {{minItems}}, max = {{maxItems}})
+    @Size(min = {{minItems}}, max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{#minItems}}{{^maxItems}}
-    @Size(min = {{minItems}})
+    @Size(min = {{minItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{^minItems}}{{#maxItems}}
-    @Size(max = {{maxItems}})
+    @Size(max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{!Email}}
     {{#isEmail}}
-    @Email{{#pattern}}(pattern = "{{{pattern}}}"){{/pattern}}
+    @Email{{#pattern}}(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}}){{/pattern}}{{^pattern}}{{#vendorExtensions.x-pattern-message}}(message = "{{{.}}}"){{/vendorExtensions.x-pattern-message}}{{/pattern}}
     {{/isEmail}}
     {{!check for integer or long / all others=decimal type with @Decimal isInteger set}}
     {{#isInteger}}
         {{#minimum}}
-    @Min({{minimum}})
+    @Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @Max({{maximum}})
+    @Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isInteger}}
     {{!isLong set}}
     {{#isLong}}
         {{#minimum}}
-    @Min({{minimum}}L)
+    @Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}L{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @Max({{maximum}}L)
+    @Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}L{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isLong}}
     {{!Not Integer, not Long => we have a decimal value!}}
     {{^isInteger}}
         {{^isLong}}{{!minimum for decimal value}}
             {{#minimum}}
-    @DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}})
+    @DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}{{^exclusiveMinimum}}{{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
             {{/minimum}}
     {{!maximal for decimal value}}
             {{#maximum}}
-    @DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}})
+    @DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}{{^exclusiveMaximum}}{{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
             {{/maximum}}
         {{/isLong}}
     {{/isInteger}}
diff --git a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation.mustache b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation.mustache
index 85c0c13486..460c35d3fb 100644
--- a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation.mustache
+++ b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation.mustache
@@ -17,7 +17,7 @@
     {{^isNullable}}
         {{#required}}
             {{^isReadOnly}}
-    @NotNull
+    @NotNull{{#vendorExtensions.x-not-null-message}}(message = "{{{.}}}"){{/vendorExtensions.x-not-null-message}}
             {{/isReadOnly}}
         {{/required}}
     {{/isNullable}}
@@ -30,63 +30,63 @@
     {{/isContainer}}
     {{!Pattern}}
     {{#pattern}}
-        {{^isByteArray}}{{^isDate}}{{^isDateTime}}
-    @Pattern(regexp = "{{{pattern}}}")
-        {{/isDateTime}}{{/isDate}}{{/isByteArray}}
+        {{^isEmail}}{{^isByteArray}}{{^isDate}}{{^isDateTime}}
+    @Pattern(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}})
+        {{/isDateTime}}{{/isDate}}{{/isByteArray}}{{/isEmail}}
     {{/pattern}}
     {{!Min length && max length}}
     {{#minLength}}
         {{#maxLength}}
-    @Size(min = {{minLength}}, max = {{maxLength}})
+    @Size(min = {{minLength}}, max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
         {{/maxLength}}
     {{/minLength}}
     {{#minLength}}{{^maxLength}}
-    @Size(min = {{minLength}})
+    @Size(min = {{minLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{^minLength}}{{#maxLength}}
-    @Size(max = {{maxLength}})
+    @Size(max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{!Size}}
     {{#minItems}}{{#maxItems}}
-    @Size(min = {{minItems}}, max = {{maxItems}})
+    @Size(min = {{minItems}}, max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{#minItems}}{{^maxItems}}
-    @Size(min = {{minItems}})
+    @Size(min = {{minItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{^minItems}}{{#maxItems}}
-    @Size(max = {{maxItems}})
+    @Size(max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{!Email}}
     {{#isEmail}}
-    @Email
+    @Email{{#pattern}}(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}}){{/pattern}}{{^pattern}}{{#vendorExtensions.x-pattern-message}}(message = "{{{.}}}"){{/vendorExtensions.x-pattern-message}}{{/pattern}}
     {{/isEmail}}
     {{!check for integer or long / all others=decimal type with @Decimal isInteger set}}
     {{#isInteger}}
         {{#minimum}}
-    @Min({{minimum}})
+    @Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @Max({{maximum}})
+    @Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isInteger}}
     {{!isLong set}}
     {{#isLong}}
         {{#minimum}}
-    @Min({{minimum}}L)
+    @Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}L{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @Max({{maximum}}L)
+    @Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}L{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isLong}}
     {{!Not Integer, not Long => we have a decimal value!}}
     {{^isInteger}}
         {{^isLong}}{{!minimum for decimal value}}
             {{#minimum}}
-    @DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}})
+    @DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}{{^exclusiveMinimum}}{{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
             {{/minimum}}
     {{!maximal for decimal value}}
             {{#maximum}}
-    @DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}})
+    @DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}{{^exclusiveMaximum}}{{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
             {{/maximum}}
         {{/isLong}}
     {{/isInteger}}
diff --git a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation_field.mustache b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation_field.mustache
index ee22a4199b..a67a595b65 100644
--- a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation_field.mustache
+++ b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/params/validation_field.mustache
@@ -17,12 +17,12 @@
     {{^isNullable}}
         {{#required}}
             {{^isReadOnly}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}NotNull
+    @{{{vendorExtensions.fieldAnnPrefix}}}NotNull{{#vendorExtensions.x-not-null-message}}(message = "{{{.}}}"){{/vendorExtensions.x-not-null-message}}
             {{/isReadOnly}}
         {{/required}}
     {{/isNullable}}
-    {{^isUuid}}
     {{!Validate all pojos and enums}}
+    {{^isUuid}}
     {{^isContainer}}
         {{#isModel}}
     @{{{vendorExtensions.fieldAnnPrefix}}}Valid
@@ -30,63 +30,63 @@
     {{/isContainer}}
     {{!Pattern}}
     {{#pattern}}
-        {{^isByteArray}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Pattern(regexp = "{{{pattern}}}")
-        {{/isByteArray}}
+        {{^isEmail}}{{^isByteArray}}{{^isDate}}{{^isDateTime}}
+    @{{{vendorExtensions.fieldAnnPrefix}}}Pattern(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}})
+        {{/isDateTime}}{{/isDate}}{{/isByteArray}}{{/isEmail}}
     {{/pattern}}
     {{!Min length && max length}}
     {{#minLength}}
         {{#maxLength}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minLength}}, max = {{maxLength}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minLength}}, max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
         {{/maxLength}}
     {{/minLength}}
     {{#minLength}}{{^maxLength}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minLength}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{^minLength}}{{#maxLength}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(max = {{maxLength}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(max = {{maxLength}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxLength}}{{/minLength}}
     {{!Size}}
     {{#minItems}}{{#maxItems}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minItems}}, max = {{maxItems}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minItems}}, max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{#minItems}}{{^maxItems}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minItems}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(min = {{minItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{^minItems}}{{#maxItems}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Size(max = {{maxItems}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Size(max = {{maxItems}}{{#vendorExtensions.x-size-message}}, message = "{{{.}}}"{{/vendorExtensions.x-size-message}})
     {{/maxItems}}{{/minItems}}
     {{!Email}}
     {{#isEmail}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Email
+    @{{{vendorExtensions.fieldAnnPrefix}}}Email{{#pattern}}(regexp = "{{{pattern}}}"{{#vendorExtensions.x-pattern-message}}, message = "{{{.}}}"{{/vendorExtensions.x-pattern-message}}){{/pattern}}{{^pattern}}{{#vendorExtensions.x-pattern-message}}(message = "{{{.}}}"){{/vendorExtensions.x-pattern-message}}{{/pattern}}
     {{/isEmail}}
     {{!check for integer or long / all others=decimal type with @Decimal isInteger set}}
     {{#isInteger}}
         {{#minimum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Min({{minimum}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Max({{maximum}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isInteger}}
     {{!isLong set}}
     {{#isLong}}
         {{#minimum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Min({{minimum}}L)
+    @{{{vendorExtensions.fieldAnnPrefix}}}Min({{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{{.}}}L{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
         {{/minimum}}
         {{#maximum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}Max({{maximum}}L)
+    @{{{vendorExtensions.fieldAnnPrefix}}}Max({{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{{.}}}L{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
         {{/maximum}}
     {{/isLong}}
     {{!Not Integer, not Long => we have a decimal value!}}
     {{^isInteger}}
         {{^isLong}}{{!minimum for decimal value}}
             {{#minimum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}DecimalMin({{#exclusiveMinimum}}value = {{/exclusiveMinimum}}{{^exclusiveMinimum}}{{#vendorExtensions.x-min-message}}value = {{/vendorExtensions.x-min-message}}{{/exclusiveMinimum}}"{{minimum}}"{{#exclusiveMinimum}}, inclusive = false{{/exclusiveMinimum}}{{#vendorExtensions.x-min-message}}, message = "{{{.}}}"{{/vendorExtensions.x-min-message}})
             {{/minimum}}
     {{!maximal for decimal value}}
             {{#maximum}}
-    @{{{vendorExtensions.fieldAnnPrefix}}}DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}})
+    @{{{vendorExtensions.fieldAnnPrefix}}}DecimalMax({{#exclusiveMaximum}}value = {{/exclusiveMaximum}}{{^exclusiveMaximum}}{{#vendorExtensions.x-max-message}}value = {{/vendorExtensions.x-max-message}}{{/exclusiveMaximum}}"{{maximum}}"{{#exclusiveMaximum}}, inclusive = false{{/exclusiveMaximum}}{{#vendorExtensions.x-max-message}}, message = "{{{.}}}"{{/vendorExtensions.x-max-message}})
             {{/maximum}}
         {{/isLong}}
     {{/isInteger}}
diff --git a/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautClientCodegenTest.java b/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautClientCodegenTest.java
index 141c087099..4c464a279c 100644
--- a/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautClientCodegenTest.java
+++ b/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautClientCodegenTest.java
@@ -1159,4 +1159,153 @@ public enum StateEnum {
                 """
         );
     }
+
+    @Test
+    void testCustomValidationMessages() {
+
+        var codegen = new JavaMicronautClientCodegen();
+        codegen.setUseEnumCaseInsensitive(true);
+        String outputPath = generateFiles(codegen, "src/test/resources/3_0/validation-messages.yml", CodegenConstants.APIS, CodegenConstants.MODELS);
+        String path = outputPath + "src/main/java/org/openapitools/";
+
+        assertFileContains(path + "api/BooksApi.java",
+            """
+                @QueryValue("emailParam") @NotNull List<@Email(regexp = "email@dot.com", message = "This is email pattern message") @Size(min = 5, max = 10, message = "This is min max email length message") @NotNull(message = "This is required email message") String> emailParam,
+                """,
+            """
+                @QueryValue("strParam") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam,
+                """,
+            """
+                @QueryValue("strParam2") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam2,
+                """,
+            """
+                @QueryValue("strParam3") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam3,
+                """,
+            """
+                @QueryValue("intParam") @NotNull List<@NotNull(message = "This is required int message") @Min(value = 5, message = "This is min message") @Max(value = 10, message = "This is max message") Integer> intParam,
+                """,
+            """
+                @QueryValue("decimalParam") @NotNull List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", message = "This is decimal min message") @DecimalMax(value = "10.5", message = "This is decimal max message") BigDecimal> decimalParam,
+                """,
+            """
+                    @QueryValue("decimalParam2") @NotNull(message = "This is required param message") List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message") @DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message") BigDecimal> decimalParam2,
+                """,
+            """
+                @QueryValue("positiveParam") @NotNull List<@NotNull(message = "This is required int message") @Positive(message = "This is positive message") Integer> positiveParam,
+                """,
+            """
+                @QueryValue("positiveOrZeroParam") @NotNull List<@NotNull(message = "This is required int message") @PositiveOrZero(message = "This is positive or zero message") Integer> positiveOrZeroParam,
+                """,
+            """
+                @QueryValue("negativeParam") @NotNull List<@NotNull(message = "This is required int message") @Negative(message = "This is negative message") Integer> negativeParam,
+                """,
+            """
+                @QueryValue("negativeOrZeroParam") @NotNull List<@NotNull(message = "This is required int message") @NegativeOrZero(message = "This is negative or zero message") Integer> negativeOrZeroParam,
+                """);
+
+        assertFileContains(path + "model/Book.java",
+            """
+                    @NotNull(message = "This is required string message")
+                    @Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @Size(min = 5, max = 10, message = "This is min max string length message")
+                    @JsonProperty(JSON_PROPERTY_STR_PROP)
+                    private String strProp;
+                """,
+            """
+                    @Nullable
+                    @Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @Size(min = 5, message = "This is min string length message")
+                    @JsonProperty(JSON_PROPERTY_STR_PROP2)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private String strProp2;
+                """,
+            """
+                    @Nullable
+                    @Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @Size(max = 10, message = "This is min string length message")
+                    @JsonProperty(JSON_PROPERTY_STR_PROP3)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private String strProp3;
+                """,
+            """
+                    @NotNull(message = "This is required email message")
+                    @Size(min = 5, max = 10, message = "This is min max email length message")
+                    @Email(regexp = "email@dot.com", message = "This is email pattern message")
+                    @JsonProperty(JSON_PROPERTY_EMAIL_PROP)
+                    private String emailProp;
+                """,
+            """
+                    @NotNull(message = "This is required int message")
+                    @Min(value = 5, message = "This is min message")
+                    @Max(value = 10, message = "This is max message")
+                    @JsonProperty(JSON_PROPERTY_INT_PROP)
+                    private Integer intProp;
+                """,
+            """
+                    @Nullable
+                    @Min(value = 0, message = "This is positive message")
+                    @JsonProperty(JSON_PROPERTY_POSITIVE_PROP)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private Integer positiveProp;
+                """,
+            """
+                    @Nullable
+                    @Min(value = 0, message = "This is positive or zero message")
+                    @JsonProperty(JSON_PROPERTY_POSITIVE_OR_ZERO_PROP)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private Integer positiveOrZeroProp;
+                """,
+            """
+                    @Nullable
+                    @Max(value = 0, message = "This is negative message")
+                    @JsonProperty(JSON_PROPERTY_NEGATIVE_PROP)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private Integer negativeProp;
+                """,
+            """
+                    @Nullable
+                    @Max(value = 0, message = "This is negative or zero message")
+                    @JsonProperty(JSON_PROPERTY_NEGATIVE_OR_ZERO_PROP)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private Integer negativeOrZeroProp;
+                """,
+            """
+                    @Nullable
+                    @DecimalMin(value = "5.5", message = "This is decimal min message")
+                    @DecimalMax(value = "10.5", message = "This is decimal max message")
+                    @JsonProperty(JSON_PROPERTY_DECIMAL_PROP)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private BigDecimal decimalProp;
+                """,
+            """
+                    @Nullable
+                    @DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message")
+                    @DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message")
+                    @JsonProperty(JSON_PROPERTY_DECIMAL_PROP2)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private BigDecimal decimalProp2;
+                """,
+            """
+                    @Nullable
+                    @Size(min = 5, max = 10, message = "This is min max string length message")
+                    @JsonProperty(JSON_PROPERTY_ARRAY_PROP1)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private List<@NotNull Integer> arrayProp1;
+                """,
+            """
+                    @Nullable
+                    @Size(min = 5, message = "This is min max string length message")
+                    @JsonProperty(JSON_PROPERTY_ARRAY_PROP2)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private List<@NotNull Integer> arrayProp2;
+                """,
+            """
+                    @Nullable
+                    @Size(max = 10, message = "This is min max string length message")
+                    @JsonProperty(JSON_PROPERTY_ARRAY_PROP3)
+                    @JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    private List<@NotNull Integer> arrayProp3;
+                """
+        );
+    }
 }
diff --git a/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautServerCodegenTest.java b/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautServerCodegenTest.java
index d433da3c7c..c15f3667c6 100644
--- a/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautServerCodegenTest.java
+++ b/openapi-generator/src/test/java/io/micronaut/openapi/generator/JavaMicronautServerCodegenTest.java
@@ -640,4 +640,48 @@ void testDeprecated() {
                         );
                     """);
     }
+
+    @Test
+    void testCustomValidationMessages() {
+
+        var codegen = new JavaMicronautServerCodegen();
+        codegen.setUseEnumCaseInsensitive(true);
+        String outputPath = generateFiles(codegen, "src/test/resources/3_0/validation-messages.yml", CodegenConstants.APIS, CodegenConstants.MODELS);
+        String path = outputPath + "src/main/java/org/openapitools/";
+
+        assertFileContains(path + "api/BooksApi.java",
+            """
+                @QueryValue("emailParam") @NotNull List<@Email(regexp = "email@dot.com", message = "This is email pattern message") @Size(min = 5, max = 10, message = "This is min max email length message") @NotNull(message = "This is required email message") String> emailParam,
+                """,
+            """
+                @QueryValue("strParam") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam,
+                """,
+            """
+                @QueryValue("strParam2") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam2,
+                """,
+            """
+                @QueryValue("strParam3") @NotNull List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String> strParam3,
+                """,
+            """
+                @QueryValue("intParam") @NotNull List<@NotNull(message = "This is required int message") @Min(value = 5, message = "This is min message") @Max(value = 10, message = "This is max message") Integer> intParam,
+                """,
+            """
+                @QueryValue("decimalParam") @NotNull List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", message = "This is decimal min message") @DecimalMax(value = "10.5", message = "This is decimal max message") BigDecimal> decimalParam,
+                """,
+            """
+                    @QueryValue("decimalParam2") @NotNull(message = "This is required param message") List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message") @DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message") BigDecimal> decimalParam2,
+                """,
+            """
+                @QueryValue("positiveParam") @NotNull List<@NotNull(message = "This is required int message") @Positive(message = "This is positive message") Integer> positiveParam,
+                """,
+            """
+                @QueryValue("positiveOrZeroParam") @NotNull List<@NotNull(message = "This is required int message") @PositiveOrZero(message = "This is positive or zero message") Integer> positiveOrZeroParam,
+                """,
+            """
+                @QueryValue("negativeParam") @NotNull List<@NotNull(message = "This is required int message") @Negative(message = "This is negative message") Integer> negativeParam,
+                """,
+            """
+                @QueryValue("negativeOrZeroParam") @NotNull List<@NotNull(message = "This is required int message") @NegativeOrZero(message = "This is negative or zero message") Integer> negativeOrZeroParam,
+                """);
+    }
 }
diff --git a/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautClientCodegenTest.java b/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautClientCodegenTest.java
index eb173fd0a6..ccc3454658 100644
--- a/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautClientCodegenTest.java
+++ b/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautClientCodegenTest.java
@@ -1132,4 +1132,152 @@ enum class StateEnum(
                 """
         );
     }
+
+    @Test
+    void testCustomValidationMessages() {
+
+        var codegen = new KotlinMicronautClientCodegen();
+        String outputPath = generateFiles(codegen, "src/test/resources/3_0/validation-messages.yml", CodegenConstants.APIS, CodegenConstants.MODELS);
+        String path = outputPath + "src/main/kotlin/org/openapitools/";
+
+        assertFileContains(path + "api/BooksApi.kt",
+            """
+                @QueryValue("emailParam") @NotNull emailParam: List<@Email(regexp = "email@dot.com", message = "This is email pattern message") @Size(min = 5, max = 10, message = "This is min max email length message") @NotNull(message = "This is required email message") String>,
+                """,
+            """
+                @QueryValue("strParam") @NotNull strParam: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("strParam2") @NotNull strParam2: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("strParam3") @NotNull strParam3: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("intParam") @NotNull intParam: List<@NotNull(message = "This is required int message") @Min(value = 5, message = "This is min message") @Max(value = 10, message = "This is max message") Int>,
+                """,
+            """
+                @QueryValue("decimalParam") @NotNull decimalParam: List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", message = "This is decimal min message") @DecimalMax(value = "10.5", message = "This is decimal max message") BigDecimal>,
+                """,
+            """
+                @QueryValue("decimalParam2") @NotNull(message = "This is required param message") decimalParam2: List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message") @DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message") BigDecimal>,
+                """,
+            """
+                @QueryValue("positiveParam") @NotNull positiveParam: List<@NotNull(message = "This is required int message") @Positive(message = "This is positive message") Int>,
+                """,
+            """
+                @QueryValue("positiveOrZeroParam") @NotNull positiveOrZeroParam: List<@NotNull(message = "This is required int message") @PositiveOrZero(message = "This is positive or zero message") Int>,
+                """,
+            """
+                @QueryValue("negativeParam") @NotNull negativeParam: List<@NotNull(message = "This is required int message") @Negative(message = "This is negative message") Int>,
+                """,
+            """
+                @QueryValue("negativeOrZeroParam") @NotNull negativeOrZeroParam: List<@NotNull(message = "This is required int message") @NegativeOrZero(message = "This is negative or zero message") Int>,
+                """);
+
+        assertFileContains(path + "model/Book.kt",
+            """
+                    @field:NotNull(message = "This is required string message")
+                    @field:Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @field:Size(min = 5, max = 10, message = "This is min max string length message")
+                    @field:JsonProperty(JSON_PROPERTY_STR_PROP)
+                    var strProp: String,
+                """,
+            """
+                    @field:NotNull(message = "This is required email message")
+                    @field:Size(min = 5, max = 10, message = "This is min max email length message")
+                    @field:Email(regexp = "email@dot.com", message = "This is email pattern message")
+                    @field:JsonProperty(JSON_PROPERTY_EMAIL_PROP)
+                    var emailProp: String,
+                """,
+            """
+                    @field:NotNull(message = "This is required int message")
+                    @field:Min(value = 5, message = "This is min message")
+                    @field:Max(value = 10, message = "This is max message")
+                    @field:JsonProperty(JSON_PROPERTY_INT_PROP)
+                    var intProp: Int,
+                """,
+            """
+                    @field:Nullable
+                    @field:Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @field:Size(min = 5, message = "This is min string length message")
+                    @field:JsonProperty(JSON_PROPERTY_STR_PROP2)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var strProp2: String? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Pattern(regexp = "[a-zA-Z ]+", message = "This is string pattern message")
+                    @field:Size(max = 10, message = "This is min string length message")
+                    @field:JsonProperty(JSON_PROPERTY_STR_PROP3)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var strProp3: String? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Min(value = 0, message = "This is positive message")
+                    @field:JsonProperty(JSON_PROPERTY_POSITIVE_PROP)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var positiveProp: Int? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Min(value = 0, message = "This is positive or zero message")
+                    @field:JsonProperty(JSON_PROPERTY_POSITIVE_OR_ZERO_PROP)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var positiveOrZeroProp: Int? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Max(value = 0, message = "This is negative message")
+                    @field:JsonProperty(JSON_PROPERTY_NEGATIVE_PROP)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var negativeProp: Int? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Max(value = 0, message = "This is negative or zero message")
+                    @field:JsonProperty(JSON_PROPERTY_NEGATIVE_OR_ZERO_PROP)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var negativeOrZeroProp: Int? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:DecimalMin(value = "5.5", message = "This is decimal min message")
+                    @field:DecimalMax(value = "10.5", message = "This is decimal max message")
+                    @field:JsonProperty(JSON_PROPERTY_DECIMAL_PROP)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var decimalProp: BigDecimal? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message")
+                    @field:DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message")
+                    @field:JsonProperty(JSON_PROPERTY_DECIMAL_PROP2)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var decimalProp2: BigDecimal? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Size(min = 5, max = 10, message = "This is min max string length message")
+                    @field:JsonProperty(JSON_PROPERTY_ARRAY_PROP1)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var arrayProp1: List<@NotNull Int>? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Size(min = 5, message = "This is min max string length message")
+                    @field:JsonProperty(JSON_PROPERTY_ARRAY_PROP2)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var arrayProp2: List<@NotNull Int>? = null,
+                """,
+            """
+                    @field:Nullable
+                    @field:Size(max = 10, message = "This is min max string length message")
+                    @field:JsonProperty(JSON_PROPERTY_ARRAY_PROP3)
+                    @field:JsonInclude(JsonInclude.Include.USE_DEFAULTS)
+                    var arrayProp3: List<@NotNull Int>? = null,
+                """
+        );
+    }
 }
diff --git a/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautServerCodegenTest.java b/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautServerCodegenTest.java
index 0a2e9bad54..3b61c4a044 100644
--- a/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautServerCodegenTest.java
+++ b/openapi-generator/src/test/java/io/micronaut/openapi/generator/KotlinMicronautServerCodegenTest.java
@@ -714,4 +714,47 @@ fun sendPrimitives(
                     ): Mono<SendPrimitivesResponse>
                 """);
     }
+
+    @Test
+    void testCustomValidationMessages() {
+
+        var codegen = new KotlinMicronautServerCodegen();
+        String outputPath = generateFiles(codegen, "src/test/resources/3_0/validation-messages.yml", CodegenConstants.APIS, CodegenConstants.MODELS);
+        String path = outputPath + "src/main/kotlin/org/openapitools/";
+
+        assertFileContains(path + "api/BooksApi.kt",
+            """
+                @QueryValue("emailParam") @NotNull emailParam: List<@Email(regexp = "email@dot.com", message = "This is email pattern message") @Size(min = 5, max = 10, message = "This is min max email length message") @NotNull(message = "This is required email message") String>,
+                """,
+            """
+                @QueryValue("strParam") @NotNull strParam: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("strParam2") @NotNull strParam2: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(min = 5, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("strParam3") @NotNull strParam3: List<@Pattern(regexp = "my_pattern", message = "This is string pattern message") @Size(max = 10, message = "This is min max string length message") @NotNull(message = "This is required string message") String>,
+                """,
+            """
+                @QueryValue("intParam") @NotNull intParam: List<@NotNull(message = "This is required int message") @Min(value = 5, message = "This is min message") @Max(value = 10, message = "This is max message") Int>,
+                """,
+            """
+                @QueryValue("decimalParam") @NotNull decimalParam: List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", message = "This is decimal min message") @DecimalMax(value = "10.5", message = "This is decimal max message") BigDecimal>,
+                """,
+            """
+                @QueryValue("decimalParam2") @NotNull(message = "This is required param message") decimalParam2: List<@NotNull(message = "This is required decimal message") @DecimalMin(value = "5.5", inclusive = false, message = "This is decimal min message") @DecimalMax(value = "10.5", inclusive = false, message = "This is decimal max message") BigDecimal>,
+                """,
+            """
+                @QueryValue("positiveParam") @NotNull positiveParam: List<@NotNull(message = "This is required int message") @Positive(message = "This is positive message") Int>,
+                """,
+            """
+                @QueryValue("positiveOrZeroParam") @NotNull positiveOrZeroParam: List<@NotNull(message = "This is required int message") @PositiveOrZero(message = "This is positive or zero message") Int>,
+                """,
+            """
+                @QueryValue("negativeParam") @NotNull negativeParam: List<@NotNull(message = "This is required int message") @Negative(message = "This is negative message") Int>,
+                """,
+            """
+                @QueryValue("negativeOrZeroParam") @NotNull negativeOrZeroParam: List<@NotNull(message = "This is required int message") @NegativeOrZero(message = "This is negative or zero message") Int>,
+                """);
+    }
 }
diff --git a/openapi-generator/src/test/resources/3_0/validation-messages.yml b/openapi-generator/src/test/resources/3_0/validation-messages.yml
new file mode 100644
index 0000000000..2f2180ee47
--- /dev/null
+++ b/openapi-generator/src/test/resources/3_0/validation-messages.yml
@@ -0,0 +1,292 @@
+openapi: 3.0.0
+info:
+  description: This is a library API
+  version: 1.0.0
+  title: Library
+  license:
+    name: Apache-2.0
+    url: "https://www.apache.org/licenses/LICENSE-2.0.html"
+tags:
+  - name: books
+    description: Add books
+paths:
+  /add-book:
+    post:
+      tags: [books]
+      summary: Add a new book
+      operationId: addBook
+      parameters:
+        - name: emailParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: string
+              format: email
+              pattern: email@dot.com
+              minLength: 5
+              maxLength: 10
+              x-pattern-message: This is email pattern message
+              x-size-message: This is min max email length message
+              x-not-null-message: This is required email message
+
+        - name: strParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: string
+              pattern: my_pattern
+              minLength: 5
+              maxLength: 10
+              x-pattern-message: This is string pattern message
+              x-size-message: This is min max string length message
+              x-not-null-message: This is required string message
+        - name: strParam2
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: string
+              pattern: my_pattern
+              minLength: 5
+              x-pattern-message: This is string pattern message
+              x-size-message: This is min max string length message
+              x-not-null-message: This is required string message
+
+        - name: strParam3
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: string
+              pattern: my_pattern
+              maxLength: 10
+              x-pattern-message: This is string pattern message
+              x-size-message: This is min max string length message
+              x-not-null-message: This is required string message
+
+        - name: intParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: integer
+              format: int32
+              minimum: 5
+              maximum: 10
+              x-min-message: This is min message
+              x-max-message: This is max message
+              x-not-null-message: This is required int message
+
+        - name: decimalParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: number
+              minimum: 5.5
+              maximum: 10.5
+              x-min-message: This is decimal min message
+              x-max-message: This is decimal max message
+              x-not-null-message: This is required decimal message
+
+        - name: decimalParam2
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: number
+              minimum: 5.5
+              exclusiveMinimum: true
+              maximum: 10.5
+              exclusiveMaximum: true
+              x-min-message: This is decimal min message
+              x-max-message: This is decimal max message
+              x-not-null-message: This is required decimal message
+            x-not-null-message: This is required param message
+
+        - name: positiveParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: integer
+              format: int32
+              minimum: 0
+              exclusiveMinimum: true
+              x-min-message: This is positive message
+              x-not-null-message: This is required int message
+
+        - name: positiveOrZeroParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: integer
+              format: int32
+              minimum: 0
+              exclusiveMinimum: false
+              x-min-message: This is positive or zero message
+              x-not-null-message: This is required int message
+
+        - name: negativeParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: integer
+              format: int32
+              maximum: 0
+              exclusiveMaximum: true
+              x-max-message: This is negative message
+              x-not-null-message: This is required int message
+
+        - name: negativeOrZeroParam
+          in: query
+          required: true
+          schema:
+            type: array
+            items:
+              type: integer
+              format: int32
+              maximum: 0
+              exclusiveMaximum: false
+              x-max-message: This is negative or zero message
+              x-not-null-message: This is required int message
+
+      requestBody:
+        required: true
+        content:
+          "application/json":
+            schema:
+              $ref: "#/components/schemas/Book"
+      responses:
+        "200":
+          description: Success
+        "400":
+          description: Bad Request
+components:
+  schemas:
+    Book:
+      type: object
+      required:
+        - strProp
+        - intProp
+        - emailProp
+      properties:
+        strProp:
+          type: string
+          minLength: 5
+          maxLength: 10
+          pattern: "[a-zA-Z ]+"
+          x-pattern-message: This is string pattern message
+          x-size-message: This is min max string length message
+          x-not-null-message: This is required string message
+        strProp2:
+          type: string
+          minLength: 5
+          pattern: "[a-zA-Z ]+"
+          x-pattern-message: This is string pattern message
+          x-size-message: This is min string length message
+          x-not-null-message: This is required string message
+        strProp3:
+          type: string
+          maxLength: 10
+          pattern: "[a-zA-Z ]+"
+          x-pattern-message: This is string pattern message
+          x-size-message: This is min string length message
+          x-not-null-message: This is required string message
+        emailProp:
+          type: string
+          format: email
+          pattern: email@dot.com
+          minLength: 5
+          maxLength: 10
+          x-pattern-message: This is email pattern message
+          x-size-message: This is min max email length message
+          x-not-null-message: This is required email message
+        intProp:
+          type: integer
+          format: int32
+          minimum: 5
+          maximum: 10
+          x-min-message: This is min message
+          x-max-message: This is max message
+          x-not-null-message: This is required int message
+        positiveProp:
+          type: integer
+          format: int32
+          minimum: 0
+          exclusiveMinimum: true
+          x-min-message: This is positive message
+          x-not-null-message: This is required int message
+        positiveOrZeroProp:
+          type: integer
+          format: int32
+          minimum: 0
+          exclusiveMinimum: false
+          x-min-message: This is positive or zero message
+          x-not-null-message: This is required int message
+        negativeProp:
+          type: integer
+          format: int32
+          maximum: 0
+          exclusiveMaximum: true
+          x-max-message: This is negative message
+          x-not-null-message: This is required int message
+        negativeOrZeroProp:
+          type: integer
+          format: int32
+          maximum: 0
+          exclusiveMaximum: false
+          x-max-message: This is negative or zero message
+          x-not-null-message: This is required int message
+        decimalProp:
+          type: number
+          minimum: 5.5
+          maximum: 10.5
+          x-min-message: This is decimal min message
+          x-max-message: This is decimal max message
+          x-not-null-message: This is required decimal message
+        decimalProp2:
+          type: number
+          minimum: 5.5
+          exclusiveMinimum: true
+          maximum: 10.5
+          exclusiveMaximum: true
+          x-min-message: This is decimal min message
+          x-max-message: This is decimal max message
+          x-not-null-message: This is required decimal message
+        arrayProp1:
+          type: array
+          items:
+            type: integer
+          minItems: 5
+          maxItems: 10
+          x-size-message: This is min max string length message
+          x-not-null-message: This is required string message
+        arrayProp2:
+          type: array
+          items:
+            type: integer
+          minItems: 5
+          x-size-message: This is min max string length message
+          x-not-null-message: This is required string message
+        arrayProp3:
+          type: array
+          items:
+            type: integer
+          maxItems: 10
+          x-size-message: This is min max string length message
+          x-not-null-message: This is required string message