diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
index cdf398a0d58..4bc1e243843 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/resttemplate/ApiClient.mustache
@@ -342,6 +342,8 @@ public class ApiClient {
 
     /**
      * Parse the given string into Date object.
+     * @param str the string to parse
+     * @return the Date parsed from the string
      */
     public Date parseDate(String str) {
         try {
@@ -353,6 +355,8 @@ public class ApiClient {
 
     /**
      * Format the given Date object into string.
+     * @param date the date to format
+     * @return the formatted date as string
      */
     public String formatDate(Date date) {
         return dateFormat.format(date);
@@ -386,7 +390,7 @@ public class ApiClient {
     * Formats the specified collection path parameter to a string value.
     *
     * @param collectionFormat The collection format of the parameter.
-    * @param value The value of the parameter.
+    * @param values The values of the parameter.
     * @return String representation of the parameter
     */
     public String collectionPathParameterToString(CollectionFormat collectionFormat, Collection<? extends CharSequence> values) {
diff --git a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
index c06f80a1381..7db0ef8909b 100644
--- a/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/resttemplate-withXml/src/main/java/org/openapitools/client/ApiClient.java
@@ -331,6 +331,8 @@ public class ApiClient {
 
     /**
      * Parse the given string into Date object.
+     * @param str the string to parse
+     * @return the Date parsed from the string
      */
     public Date parseDate(String str) {
         try {
@@ -342,6 +344,8 @@ public class ApiClient {
 
     /**
      * Format the given Date object into string.
+     * @param date the date to format
+     * @return the formatted date as string
      */
     public String formatDate(Date date) {
         return dateFormat.format(date);
@@ -375,7 +379,7 @@ public class ApiClient {
     * Formats the specified collection path parameter to a string value.
     *
     * @param collectionFormat The collection format of the parameter.
-    * @param value The value of the parameter.
+    * @param values The values of the parameter.
     * @return String representation of the parameter
     */
     public String collectionPathParameterToString(CollectionFormat collectionFormat, Collection<? extends CharSequence> values) {
diff --git a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
index e0c50a4e867..928a12b933a 100644
--- a/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/resttemplate/src/main/java/org/openapitools/client/ApiClient.java
@@ -326,6 +326,8 @@ public class ApiClient {
 
     /**
      * Parse the given string into Date object.
+     * @param str the string to parse
+     * @return the Date parsed from the string
      */
     public Date parseDate(String str) {
         try {
@@ -337,6 +339,8 @@ public class ApiClient {
 
     /**
      * Format the given Date object into string.
+     * @param date the date to format
+     * @return the formatted date as string
      */
     public String formatDate(Date date) {
         return dateFormat.format(date);
@@ -370,7 +374,7 @@ public class ApiClient {
     * Formats the specified collection path parameter to a string value.
     *
     * @param collectionFormat The collection format of the parameter.
-    * @param value The value of the parameter.
+    * @param values The values of the parameter.
     * @return String representation of the parameter
     */
     public String collectionPathParameterToString(CollectionFormat collectionFormat, Collection<? extends CharSequence> values) {