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 026c04dd9c2..9ec0f795219 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
@@ -117,7 +117,7 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     {{#generateClientAsBean}}
@@ -139,7 +139,7 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -163,15 +163,16 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
         return mapper;
     }
 
-    protected void init() {
+    protected static Map<String, Authentication> buildAuthentications() {{=<% %>=}}{<%={{ }}=%>{{#authMethods.0}}
         // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();{{#authMethods}}{{#isBasic}}{{#isBasicBasic}}
+        Map<String, Authentication> authentications = new HashMap<>();{{#authMethods}}{{#isBasic}}{{#isBasicBasic}}
         authentications.put("{{name}}", new HttpBasicAuth());{{/isBasicBasic}}{{#isBasicBearer}}
         authentications.put("{{name}}", new HttpBearerAuth("{{scheme}}"));{{/isBasicBearer}}{{/isBasic}}{{#isApiKey}}
         authentications.put("{{name}}", new ApiKeyAuth({{#isKeyInHeader}}"header"{{/isKeyInHeader}}{{#isKeyInQuery}}"query"{{/isKeyInQuery}}{{#isKeyInCookie}}"cookie"{{/isKeyInCookie}}, "{{keyParamName}}"));{{/isApiKey}}{{#isOAuth}}
         authentications.put("{{name}}", new OAuth());{{/isOAuth}}{{/authMethods}}
         // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+        return Collections.unmodifiableMap(authentications);{{/authMethods.0}}{{^authMethods.0}}
+        return Collections.emptyMap();{{/authMethods.0}}
     }
 
     /**
diff --git a/samples/client/others/java/webclient-useAbstractionForFiles/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/others/java/webclient-useAbstractionForFiles/src/main/java/org/openapitools/client/ApiClient.java
index 3dc2ed2c7c1..2470859ca23 100644
--- a/samples/client/others/java/webclient-useAbstractionForFiles/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/others/java/webclient-useAbstractionForFiles/src/main/java/org/openapitools/client/ApiClient.java
@@ -112,7 +112,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public ApiClient(WebClient webClient) {
@@ -131,7 +131,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -153,11 +153,8 @@ public class ApiClient extends JavaTimeFormatter {
         return mapper;
     }
 
-    protected void init() {
-        // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();
-        // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+    protected static Map<String, Authentication> buildAuthentications() {
+        return Collections.emptyMap();
     }
 
     /**
diff --git a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/ApiClient.java
index 63181b4f618..517fd6f8cf9 100644
--- a/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient-jakarta/src/main/java/org/openapitools/client/ApiClient.java
@@ -113,7 +113,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public ApiClient(WebClient webClient) {
@@ -132,7 +132,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -154,16 +154,16 @@ public class ApiClient extends JavaTimeFormatter {
         return mapper;
     }
 
-    protected void init() {
+    protected static Map<String, Authentication> buildAuthentications() {
         // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();
+        Map<String, Authentication> authentications = new HashMap<>();
         authentications.put("petstore_auth", new OAuth());
         authentications.put("api_key", new ApiKeyAuth("header", "api_key"));
         authentications.put("api_key_query", new ApiKeyAuth("query", "api_key_query"));
         authentications.put("http_basic_test", new HttpBasicAuth());
         authentications.put("bearer_test", new HttpBearerAuth("bearer"));
         // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+        return Collections.unmodifiableMap(authentications);
     }
 
     /**
diff --git a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/ApiClient.java
index 8b998104492..d37baf5cb95 100644
--- a/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient-nullable-arrays/src/main/java/org/openapitools/client/ApiClient.java
@@ -112,7 +112,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public ApiClient(WebClient webClient) {
@@ -131,7 +131,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -153,11 +153,8 @@ public class ApiClient extends JavaTimeFormatter {
         return mapper;
     }
 
-    protected void init() {
-        // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();
-        // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+    protected static Map<String, Authentication> buildAuthentications() {
+        return Collections.emptyMap();
     }
 
     /**
diff --git a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/ApiClient.java
index 5502ac03a91..8d6e1090cd8 100644
--- a/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/webclient-swagger2/src/main/java/org/openapitools/client/ApiClient.java
@@ -113,7 +113,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public ApiClient(WebClient webClient) {
@@ -132,7 +132,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -154,16 +154,16 @@ public class ApiClient extends JavaTimeFormatter {
         return mapper;
     }
 
-    protected void init() {
+    protected static Map<String, Authentication> buildAuthentications() {
         // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();
+        Map<String, Authentication> authentications = new HashMap<>();
         authentications.put("petstore_auth", new OAuth());
         authentications.put("api_key", new ApiKeyAuth("header", "api_key"));
         authentications.put("api_key_query", new ApiKeyAuth("query", "api_key_query"));
         authentications.put("http_basic_test", new HttpBasicAuth());
         authentications.put("bearer_test", new HttpBearerAuth("bearer"));
         // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+        return Collections.unmodifiableMap(authentications);
     }
 
     /**
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 5502ac03a91..8d6e1090cd8 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
@@ -113,7 +113,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.dateFormat = createDefaultDateFormat();
         this.objectMapper = createDefaultObjectMapper(this.dateFormat);
         this.webClient = buildWebClient(this.objectMapper);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public ApiClient(WebClient webClient) {
@@ -132,7 +132,7 @@ public class ApiClient extends JavaTimeFormatter {
         this.webClient = webClient;
         this.dateFormat = format;
         this.objectMapper = createDefaultObjectMapper(format);
-        this.init();
+        this.authentications = buildAuthentications();
     }
 
     public static DateFormat createDefaultDateFormat() {
@@ -154,16 +154,16 @@ public class ApiClient extends JavaTimeFormatter {
         return mapper;
     }
 
-    protected void init() {
+    protected static Map<String, Authentication> buildAuthentications() {
         // Setup authentications (key: authentication name, value: authentication).
-        authentications = new HashMap<String, Authentication>();
+        Map<String, Authentication> authentications = new HashMap<>();
         authentications.put("petstore_auth", new OAuth());
         authentications.put("api_key", new ApiKeyAuth("header", "api_key"));
         authentications.put("api_key_query", new ApiKeyAuth("query", "api_key_query"));
         authentications.put("http_basic_test", new HttpBasicAuth());
         authentications.put("bearer_test", new HttpBearerAuth("bearer"));
         // Prevent the authentications from being modified.
-        authentications = Collections.unmodifiableMap(authentications);
+        return Collections.unmodifiableMap(authentications);
     }
 
     /**