diff --git a/terasoluna-gfw-validator/src/main/java/org/terasoluna/gfw/common/validator/constraints/Compare.java b/terasoluna-gfw-validator/src/main/java/org/terasoluna/gfw/common/validator/constraints/Compare.java
index 4923e8105..1054d0300 100644
--- a/terasoluna-gfw-validator/src/main/java/org/terasoluna/gfw/common/validator/constraints/Compare.java
+++ b/terasoluna-gfw-validator/src/main/java/org/terasoluna/gfw/common/validator/constraints/Compare.java
@@ -124,14 +124,14 @@ enum Operator {
         EQUAL(CompareStrategy.EQ),
 
         /**
-         * Left side object must be grater than Right side object.
+         * Left side object must be greater than Right side object.
          */
-        GRATER_THAN(CompareStrategy.GT),
+        GREATER_THAN(CompareStrategy.GT),
 
         /**
-         * Left side object must be grater than or equal Right side object.
+         * Left side object must be greater than or equal Right side object.
          */
-        GRATER_THAN_OR_EQUAL(CompareStrategy.EQ, CompareStrategy.GT);
+        GREATER_THAN_OR_EQUAL(CompareStrategy.EQ, CompareStrategy.GT);
 
         /**
          * strategies to assert result of {@code Comparable#compareTo(Object)} as the expected.
@@ -181,7 +181,7 @@ protected boolean isExpected(int comparisonResult) {
             },
 
             /**
-             * Expected grater than ZERO.
+             * Expected greater than ZERO.
              */
             GT {
                 /**
diff --git a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMaxTest.java b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMaxTest.java
index f07ce337a..a7ca5d583 100644
--- a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMaxTest.java
+++ b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMaxTest.java
@@ -31,7 +31,7 @@
  */
 public class ByteMaxTest extends AbstractConstraintsTest<ByteMaxTestForm> {
 
-    private static final String MESSAGE_VALIDATION_ERROR = "must be under %d Bytes";
+    private static final String MESSAGE_VALIDATION_ERROR = "must be less than or equal to %d Bytes";
 
     @Before
     public void before() {
diff --git a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMinTest.java b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMinTest.java
index 042d2282d..6e7c1eafa 100644
--- a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMinTest.java
+++ b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/ByteMinTest.java
@@ -31,7 +31,7 @@
  */
 public class ByteMinTest extends AbstractConstraintsTest<ByteMinTestForm> {
 
-    private static final String MESSAGE_VALIDATION_ERROR = "must be over %d Bytes";
+    private static final String MESSAGE_VALIDATION_ERROR = "must be greater than or equal to %d Bytes";
 
     @Before
     public void before() {
diff --git a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/CompareTest.java b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/CompareTest.java
index a4544c686..c1650d82e 100644
--- a/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/CompareTest.java
+++ b/terasoluna-gfw-validator/src/test/java/org/terasoluna/gfw/common/validator/constraints/CompareTest.java
@@ -211,13 +211,13 @@ public void testSpecifyOperatorEqual() throws Throwable {
      * @throws Throwable
      */
     @Test
-    public void testSpecifyOperatorGraterThan() throws Throwable {
+    public void testSpecifyOperatorGreaterThan() throws Throwable {
 
         {
             form.setLeft(99);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThan.class);
+            violations = validator.validate(form, GreaterThan.class);
             assertThat(violations.size(), is(1));
             assertThat(violations.iterator().next().getMessage(), is(String
                     .format(MESSAGE_VALIDATION_ERROR, "left", "right")));
@@ -227,7 +227,7 @@ public void testSpecifyOperatorGraterThan() throws Throwable {
             form.setLeft(100);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThan.class);
+            violations = validator.validate(form, GreaterThan.class);
             assertThat(violations.size(), is(1));
             assertThat(violations.iterator().next().getMessage(), is(String
                     .format(MESSAGE_VALIDATION_ERROR, "left", "right")));
@@ -237,7 +237,7 @@ public void testSpecifyOperatorGraterThan() throws Throwable {
             form.setLeft(101);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThan.class);
+            violations = validator.validate(form, GreaterThan.class);
             assertThat(violations.size(), is(0));
         }
     }
@@ -247,13 +247,13 @@ public void testSpecifyOperatorGraterThan() throws Throwable {
      * @throws Throwable
      */
     @Test
-    public void testSpecifyOperatorGraterThanOrEqual() throws Throwable {
+    public void testSpecifyOperatorGreaterThanOrEqual() throws Throwable {
 
         {
             form.setLeft(99);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThanOrEqual.class);
+            violations = validator.validate(form, GreaterThanOrEqual.class);
             assertThat(violations.size(), is(1));
             assertThat(violations.iterator().next().getMessage(), is(String
                     .format(MESSAGE_VALIDATION_ERROR, "left", "right")));
@@ -263,7 +263,7 @@ public void testSpecifyOperatorGraterThanOrEqual() throws Throwable {
             form.setLeft(100);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThanOrEqual.class);
+            violations = validator.validate(form, GreaterThanOrEqual.class);
             assertThat(violations.size(), is(0));
         }
 
@@ -271,7 +271,7 @@ public void testSpecifyOperatorGraterThanOrEqual() throws Throwable {
             form.setLeft(101);
             form.setRight(100);
 
-            violations = validator.validate(form, GraterThanOrEqual.class);
+            violations = validator.validate(form, GreaterThanOrEqual.class);
             assertThat(violations.size(), is(0));
         }
     }
@@ -475,15 +475,15 @@ private static interface LessThan {
     };
 
     /**
-     * Validation group operator grater than.
+     * Validation group operator greater than.
      */
-    private static interface GraterThan {
+    private static interface GreaterThan {
     };
 
     /**
-     * Validation group operator grater than or equal.
+     * Validation group operator greater than or equal.
      */
-    private static interface GraterThanOrEqual {
+    private static interface GreaterThanOrEqual {
     };
 
     /**
@@ -536,8 +536,8 @@ private static interface NotComparableLeft {
 
     @Compare.List({
             @Compare(left = "left", right = "right", operator = Operator.EQUAL),
-            @Compare(left = "left", right = "right", operator = Operator.GRATER_THAN_OR_EQUAL, groups = { GraterThanOrEqual.class }),
-            @Compare(left = "left", right = "right", operator = Operator.GRATER_THAN, groups = { GraterThan.class }),
+            @Compare(left = "left", right = "right", operator = Operator.GREATER_THAN_OR_EQUAL, groups = { GreaterThanOrEqual.class }),
+            @Compare(left = "left", right = "right", operator = Operator.GREATER_THAN, groups = { GreaterThan.class }),
             @Compare(left = "left", right = "right", operator = Operator.LESS_THAN_OR_EQUAL, groups = { LessThanOrEqual.class }),
             @Compare(left = "left", right = "right", operator = Operator.LESS_THAN, groups = { LessThan.class }),
             @Compare(left = "left", right = "right", operator = Operator.EQUAL, requireBoth = true, groups = { RequireBoth.class }),
diff --git a/terasoluna-gfw-validator/src/test/resources/ValidationMessages.properties b/terasoluna-gfw-validator/src/test/resources/ValidationMessages.properties
index a1e713205..a438f19a5 100644
--- a/terasoluna-gfw-validator/src/test/resources/ValidationMessages.properties
+++ b/terasoluna-gfw-validator/src/test/resources/ValidationMessages.properties
@@ -1,5 +1,5 @@
 # this file contains the default messages of JSR 303 bean validation for validations provided in the common library
 
-org.terasoluna.gfw.common.validator.constraints.ByteMin.message = must be over {value} Bytes
-org.terasoluna.gfw.common.validator.constraints.ByteMax.message = must be under {value} Bytes
+org.terasoluna.gfw.common.validator.constraints.ByteMin.message = must be greater than or equal to {value} Bytes
+org.terasoluna.gfw.common.validator.constraints.ByteMax.message = must be less than or equal to {value} Bytes
 org.terasoluna.gfw.common.validator.constraints.Compare.message = not match '{left}' and '{right}'