fix pmd useutilityclass, refactor example class modifiers

Author: Benjosh95

examples/authentication/src/main/java/cloud/stackit/sdk/authentication/examples/AuthenticationExample.java

@@ -15,8 +15,8 @@ final class AuthenticationExample {
 	private static final String PRIVATE_KEY_PATH = "/path/to/private_key.pem";
 	private static final String SERVICE_ACCOUNT_MAIL = "name-1234@sa.stackit.cloud";
 
-	@SuppressWarnings({"PMD.CyclomaticComplexity", "PMD.NPathComplexity", "PMD.SystemPrintln"})
-	public static void main(String[] args) {
+	@SuppressWarnings({"PMD.CyclomaticComplexity", "PMD.NPathComplexity", "PMD.SystemPrintln", "PMD.UseUtilityClass"})
+	public static void main(String[] args) throws IOException {
 		/* OPTION 1: setting the paths to service account key (and private key) as configuration */
 		try {
 			ResourceManagerApi api =
@@ -126,6 +126,4 @@ public static void main(String[] args) {
 			throw new IllegalStateException(e);
 		}
 	}
-
-	private AuthenticationExample() {}
 }

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

@@ -23,7 +23,7 @@
  * */
 final class CustomHttpClientExample {
 
-	@SuppressWarnings("PMD.SystemPrintln")
+	@SuppressWarnings({"PMD.SystemPrintln", "PMD.UseUtilityClass"})
 	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

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

@@ -17,7 +17,8 @@ final class IaaSExample {
 		"PMD.CognitiveComplexity",
 		"PMD.NPathComplexity",
 		"PMD.NcssCount",
-		"PMD.SystemPrintln"
+		"PMD.SystemPrintln",
+		"PMD.UseUtilityClass"
 	})
 	public static void main(String[] args) throws IOException {
 		/*
@@ -290,6 +291,4 @@ public static void main(String[] args) throws IOException {
 			throw new IllegalStateException(e);
 		}
 	}
-
-	private IaaSExample() {}
 }

examples/resourcemanager/src/main/java/cloud/stackit/sdk/resourcemanager/examples/ResourcemanagerExample.java

@@ -19,7 +19,7 @@
 
 final class ResourcemanagerExample {
 
-	@SuppressWarnings({"PMD.NPathComplexity", "PMD.SystemPrintln"})
+	@SuppressWarnings({"PMD.NPathComplexity", "PMD.SystemPrintln", "PMD.UseUtilityClass"})
 	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
@@ -113,6 +113,4 @@ public static void main(String[] args) throws IOException {
 			throw new IllegalStateException(e);
 		}
 	}
-
-	private ResourcemanagerExample() {}
 }