Fix #20370 by adding an OAuth access token supplier (#21800)

modules/openapi-generator/src/main/resources/Java/libraries/restclient/ApiClient.mustache

@@ -389,10 +389,20 @@ public class ApiClient{{#jsr310}} extends JavaTimeFormatter{{/jsr310}} {
      * @param accessToken the access token
      */
     public void setAccessToken(String accessToken) {
+        setAccessToken(() -> accessToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for OAuth2 authentication.
+     *
+     * @param tokenSupplier The supplier of access tokens
+     * @return ApiClient this client
+     */
+    public ApiClient setAccessToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof OAuth) {
-                ((OAuth) auth).setAccessToken(accessToken);
+                ((OAuth) auth).setAccessToken(tokenSupplier);
-                return;
+                return this;
             }
         }
         throw new RuntimeException("No OAuth2 authentication configured!");

samples/client/petstore/java/restclient-swagger2/src/main/java/org/openapitools/client/ApiClient.java

@@ -386,10 +386,20 @@ public class ApiClient extends JavaTimeFormatter {
      * @param accessToken the access token
      */
     public void setAccessToken(String accessToken) {
+        setAccessToken(() -> accessToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for OAuth2 authentication.
+     *
+     * @param tokenSupplier The supplier of access tokens
+     * @return ApiClient this client
+     */
+    public ApiClient setAccessToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof OAuth) {
-                ((OAuth) auth).setAccessToken(accessToken);
+                ((OAuth) auth).setAccessToken(tokenSupplier);
-                return;
+                return this;
             }
         }
         throw new RuntimeException("No OAuth2 authentication configured!");

samples/client/petstore/java/restclient-useSingleRequestParameter-static/src/main/java/org/openapitools/client/ApiClient.java

@@ -386,10 +386,20 @@ public class ApiClient extends JavaTimeFormatter {
      * @param accessToken the access token
      */
     public void setAccessToken(String accessToken) {
+        setAccessToken(() -> accessToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for OAuth2 authentication.
+     *
+     * @param tokenSupplier The supplier of access tokens
+     * @return ApiClient this client
+     */
+    public ApiClient setAccessToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof OAuth) {
-                ((OAuth) auth).setAccessToken(accessToken);
+                ((OAuth) auth).setAccessToken(tokenSupplier);
-                return;
+                return this;
             }
         }
         throw new RuntimeException("No OAuth2 authentication configured!");

samples/client/petstore/java/restclient-useSingleRequestParameter/src/main/java/org/openapitools/client/ApiClient.java

@@ -386,10 +386,20 @@ public class ApiClient extends JavaTimeFormatter {
      * @param accessToken the access token
      */
     public void setAccessToken(String accessToken) {
+        setAccessToken(() -> accessToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for OAuth2 authentication.
+     *
+     * @param tokenSupplier The supplier of access tokens
+     * @return ApiClient this client
+     */
+    public ApiClient setAccessToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof OAuth) {
-                ((OAuth) auth).setAccessToken(accessToken);
+                ((OAuth) auth).setAccessToken(tokenSupplier);
-                return;
+                return this;
             }
         }
         throw new RuntimeException("No OAuth2 authentication configured!");

samples/client/petstore/java/restclient/src/main/java/org/openapitools/client/ApiClient.java

@@ -386,10 +386,20 @@ public class ApiClient extends JavaTimeFormatter {
      * @param accessToken the access token
      */
     public void setAccessToken(String accessToken) {
+        setAccessToken(() -> accessToken);
+    }
+
+    /**
+     * Helper method to set the supplier of access tokens for OAuth2 authentication.
+     *
+     * @param tokenSupplier The supplier of access tokens
+     * @return ApiClient this client
+     */
+    public ApiClient setAccessToken(Supplier<String> tokenSupplier) {
         for (Authentication auth : authentications.values()) {
             if (auth instanceof OAuth) {
-                ((OAuth) auth).setAccessToken(accessToken);
+                ((OAuth) auth).setAccessToken(tokenSupplier);
-                return;
+                return this;
             }
         }
         throw new RuntimeException("No OAuth2 authentication configured!");