feat(java-sdk): include core module in service generation

scripts/generate-sdk/.openapi-generator-ignore-java

@@ -19,3 +19,12 @@ gradle.properties
 gradlew.bat
 gradlew
 gradle/**
+
+# ApiException from core library should be used (avoid multiple ApiException imports in case different services are used at the same time)
+**/ApiException.java
+
+# Authentication classes are not required because the KeyFlowAuth is attached as interceptor
+**/auth/**
+
+# Service Configuration is not required. It only stores a defaultApiClient
+**/Configuration.java

templates/java/ApiCallback.mustache

@@ -0,0 +1,54 @@
+{{! This template was customized to add the core ApiException class as import. }}
+{{! Original template: https://github.com/OpenAPITools/openapi-generator/blob/v7.14.0/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiCallback.mustache }}
+{{>licenseInfo}}
+
+package {{invokerPackage}};
+
+import java.io.IOException;
+import cloud.stackit.sdk.core.exception.ApiException;
+
+import java.util.Map;
+import java.util.List;
+
+/**
+ * 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);
+}