fix pmd SystemPrintln

Author: Benjosh95

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

@@ -7,6 +7,8 @@
 import cloud.stackit.sdk.iaas.model.*;
 import java.io.IOException;
 import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import okhttp3.OkHttpClient;
 
 /*
@@ -22,6 +24,8 @@
  *
  * */
 public class CustomHttpClientExample {
+	private static final Logger LOGGER = Logger.getLogger(CustomHttpClientExample.class.getName());
+
 	public static void main(String[] args) throws IOException {
 		// Credentials are read from the credentialsFile in `~/.stackit/credentials.json` or the env
 		// STACKIT_SERVICE_ACCOUNT_KEY_PATH / STACKIT_SERVICE_ACCOUNT_KEY
@@ -37,17 +41,19 @@ public static void main(String[] args) throws IOException {
 		// the id of your STACKIT project, read from env var for this example
 		String projectIdString = System.getenv("STACKIT_PROJECT_ID");
 		if (projectIdString == null || projectIdString.isEmpty()) {
-			System.err.println("Environment variable 'STACKIT_PROJECT_ID' not found.");
+			LOGGER.severe("Environment variable 'STACKIT_PROJECT_ID' not found.");
 			return;
 		}
 		UUID projectId = UUID.fromString(projectIdString);
 
 		try {
 			/* list all servers */
 			ServerListResponse servers = iaasApi.listServers(projectId, false, null);
-			System.out.println("\nAvailable servers: ");
-			for (Server server : servers.getItems()) {
-				System.out.println("* " + server.getId() + " | " + server.getName());
+			if (LOGGER.isLoggable(Level.INFO)) {
+				LOGGER.info("\nAvailable servers: ");
+				for (Server server : servers.getItems()) {
+					LOGGER.info("* " + server.getId() + " | " + server.getName());
+				}
 			}
 		} catch (ApiException e) {
 			throw new RuntimeException(e);