feat(iaas): add multi API version support

CHANGELOG.md

@@ -1,12 +1,14 @@
 ## Release (2026-MM-DD)
+- `alb`: [v0.5.0](services/alb/CHANGELOG.md#v050)
+  - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
+- `iaas`: [v1.2.0](services/resourcemanager/CHANGELOG.md#v120)
+  - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
 - `resourcemanager`: [v0.5.0](services/resourcemanager/CHANGELOG.md#v050)
   - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
 - `sfs`: [v0.3.1](services/sfs/CHANGELOG.md#v031)
   - Deprecate `getSchedule` and `listSchedules` methods in `SfsApi` class
 
 ## Release (2026-04-08)
-- `alb`: [v0.5.0](services/alb/CHANGELOG.md#v050)
-  - **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
 - `iaas`: 
   - [v1.0.1](services/iaas/CHANGELOG.md#v101)
     - **Docs:** Extend docs of class `PortRange`

examples/custom-http-client/src/main/java/cloud/stackit/sdk/customhttpclient/examples/CustomHttpClientExample.java

@@ -3,8 +3,8 @@
 import cloud.stackit.sdk.core.KeyFlowAuthenticator;
 import cloud.stackit.sdk.core.config.CoreConfiguration;
 import cloud.stackit.sdk.core.exception.ApiException;
-import cloud.stackit.sdk.iaas.api.IaasApi;
-import cloud.stackit.sdk.iaas.model.*;
+import cloud.stackit.sdk.iaas.v2api.api.IaasApi;
+import cloud.stackit.sdk.iaas.v2api.model.*;
 import java.io.IOException;
 import java.util.UUID;
 import okhttp3.OkHttpClient;

examples/iaas/src/main/java/cloud/stackit/sdk/iaas/examples/IaaSExample.java

@@ -1,8 +1,8 @@
 package cloud.stackit.sdk.iaas.examples;
 
 import cloud.stackit.sdk.core.exception.ApiException;
-import cloud.stackit.sdk.iaas.api.IaasApi;
-import cloud.stackit.sdk.iaas.model.*;
+import cloud.stackit.sdk.iaas.v2api.api.IaasApi;
+import cloud.stackit.sdk.iaas.v2api.model.*;
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.util.Collections;

examples/serverbackup/src/main/java/cloud/stackit/sdk/serverbackup/examples/ServerbackupExample.java → examples/serverbackup/src/main/java/cloud/stackit/sdk/serverbackup/examples/ServerBackupExample.java

@@ -1,8 +1,8 @@
 package cloud.stackit.sdk.serverbackup.examples;
 
 import cloud.stackit.sdk.core.exception.ApiException;
-import cloud.stackit.sdk.iaas.api.IaasApi;
-import cloud.stackit.sdk.iaas.model.*;
+import cloud.stackit.sdk.iaas.v2api.api.IaasApi;
+import cloud.stackit.sdk.iaas.v2api.model.*;
 import cloud.stackit.sdk.serverbackup.api.ServerBackupApi;
 import cloud.stackit.sdk.serverbackup.model.*;
 import cloud.stackit.sdk.serverbackup.model.Backup;

services/iaas/CHANGELOG.md

@@ -1,3 +1,6 @@
+## v1.2.0
+- **Feature (breaking change):** Introduction of multi API version support. See the GitHub discussion post for more details: https://github.com/stackitcloud/stackit-sdk-java/discussions/530
+
 ## v1.1.0
 - **Feature:** Add `cascade` parameter to `deleteVolume` methods in `DefaultApi` / `IaasApi` class
 - **Feature:** Add methods for new attribute `configDrive` in `CreateServerPayload` and `Server` class

services/iaas/README.md

@@ -1,11 +1,5 @@
 # STACKIT Java SDK for STACKIT IaaS API
 
-- API version: 2
-
-This API allows you to create and modify IaaS resources.
-
-For more information, please visit [https://support.stackit.cloud/servicedesk](https://support.stackit.cloud/servicedesk)
-
 This package is part of the STACKIT Java SDK. For additional information, please visit the [GitHub repository](https://github.com/stackitcloud/stackit-sdk-java) of the SDK.
 
 ## Installation from Maven Central (recommended)

services/iaas/VERSION

@@ -1 +1 @@
-1.1.0
+1.2.0

services/iaas/src/main/java/cloud/stackit/sdk/iaas/v1api/ApiCallback.java

@@ -0,0 +1,60 @@
+/*
+ * STACKIT IaaS API
+ * This API is deprecated. It will be retired on 01.03.2027. Please use the STACKIT IaaS API V2 instead.
+ *
+ * The version of the OpenAPI document: 1
+ * Contact: stackit-iaas@mail.schwarz
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+package cloud.stackit.sdk.iaas.v1api;
+
+import cloud.stackit.sdk.core.exception.ApiException;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Callback for asynchronous API call.
+ *
+ * @param <T> The return type
+ */
+public interface ApiCallback<T> {
+	/**
+	 * This is called when the API call fails.
+	 *
+	 * @param e The exception causing the failure
+	 * @param statusCode Status code of the response if available, otherwise it would be 0
+	 * @param responseHeaders Headers of the response if available, otherwise it would be null
+	 */
+	void onFailure(ApiException e, int statusCode, Map<String, List<String>> responseHeaders);
+
+	/**
+	 * This is called when the API call succeeded.
+	 *
+	 * @param result The result deserialized from response
+	 * @param statusCode Status code of the response
+	 * @param responseHeaders Headers of the response
+	 */
+	void onSuccess(T result, int statusCode, Map<String, List<String>> responseHeaders);
+
+	/**
+	 * This is called when the API upload processing.
+	 *
+	 * @param bytesWritten bytes Written
+	 * @param contentLength content length of request body
+	 * @param done write end
+	 */
+	void onUploadProgress(long bytesWritten, long contentLength, boolean done);
+
+	/**
+	 * This is called when the API download processing.
+	 *
+	 * @param bytesRead bytes Read
+	 * @param contentLength content length of the response
+	 * @param done Read end
+	 */
+	void onDownloadProgress(long bytesRead, long contentLength, boolean done);
+}