diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
index 28260368a9b3..fe3c172a6297 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache
@@ -88,6 +88,8 @@ public class ApiClient {
     public ApiClient() {
         this.dateFormat = createDefaultDateFormat();
         this.webClient = buildWebClient(new ObjectMapper(), this.dateFormat);
+
+        init();
     }
 
     public ApiClient(ObjectMapper mapper, DateFormat format) {
@@ -97,6 +99,8 @@ public class ApiClient {
     private ApiClient(WebClient webClient, DateFormat format) {
         this.webClient = webClient;
         this.dateFormat = format;
+
+        init();
     }
 
     public DateFormat createDefaultDateFormat() {
diff --git a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
index ee1885811e6f..88b883f366b4 100644
--- a/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient/src/main/java/org/openapitools/client/ApiClient.java
@@ -88,6 +88,8 @@ private String collectionToString(Collection<? extends CharSequence> collection)
     public ApiClient() {
         this.dateFormat = createDefaultDateFormat();
         this.webClient = buildWebClient(new ObjectMapper(), this.dateFormat);
+
+        init();
     }
 
     public ApiClient(ObjectMapper mapper, DateFormat format) {
@@ -97,6 +99,8 @@ public ApiClient(ObjectMapper mapper, DateFormat format) {
     private ApiClient(WebClient webClient, DateFormat format) {
         this.webClient = webClient;
         this.dateFormat = format;
+
+        init();
     }
 
     public DateFormat createDefaultDateFormat() {