chore(sdk): enforce java 8 compatibility

Author: rubenhoenle

build.gradle

@@ -24,10 +24,15 @@ allprojects {
 	java {
 		sourceCompatibility = JavaVersion.VERSION_1_8
 		targetCompatibility = JavaVersion.VERSION_1_8
+
+		toolchain {
+			languageVersion = JavaLanguageVersion.of(8)
+		}
 	}
 
 	tasks.withType(JavaCompile).configureEach {
 		options.encoding = 'UTF-8'
+		options.release = 8 // enforce java 8 compatibility
 	}
 
 	spotless {
@@ -69,7 +74,6 @@ subprojects {
 	afterEvaluate { project ->
 		// only apply to service sub-projects and core
 		if (project.path.startsWith(':services:') || project.name == "core" ) {
-
 			// override the version of each service with the ones obtained from the VERSION files
 			def versionFile = project.file("VERSION")
 			if (versionFile.exists()) {

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

@@ -4,6 +4,7 @@
 import cloud.stackit.sdk.iaas.api.IaasApi;
 import cloud.stackit.sdk.iaas.model.*;
 import java.io.IOException;
+import java.util.Collections;
 import java.util.Map;
 import java.util.Objects;
 import java.util.UUID;
@@ -36,7 +37,7 @@ public static void main(String[] args) throws IOException {
 									.name("java-sdk-example-network-01")
 									.dhcp(true)
 									.routed(false)
-									.labels(Map.ofEntries(Map.entry("foo", "bar")))
+									.labels(Collections.singletonMap("foo", "bar"))
 									.addressFamily(
 											new CreateNetworkAddressFamily()
 													.ipv4(
@@ -50,7 +51,7 @@ public static void main(String[] args) throws IOException {
 					newNetwork.getNetworkId(),
 					new PartialUpdateNetworkPayload()
 							.dhcp(false)
-							.labels(Map.ofEntries(Map.entry("foo", "bar-updated"))));
+							.labels(Collections.singletonMap("foo", "bar-updated")));
 
 			/* fetch the network we just created */
 			Network fetchedNetwork = iaasApi.getNetwork(projectId, newNetwork.getNetworkId());
@@ -83,7 +84,7 @@ public static void main(String[] args) throws IOException {
 			/* get an image */
 			UUID imageId =
 					images.getItems()
-							.getFirst()
+							.get(0)
 							.getId(); // we just use a random image id in our example
 			assert imageId != null;
 			Image fetchedImage = iaasApi.getImage(projectId, imageId);
@@ -119,7 +120,7 @@ public static void main(String[] args) throws IOException {
 			assert newKeypair.getName() != null;
 			iaasApi.updateKeyPair(
 					newKeypair.getName(),
-					new UpdateKeyPairPayload().labels(Map.ofEntries(Map.entry("foo", "bar"))));
+					new UpdateKeyPairPayload().labels(Collections.singletonMap("foo", "bar")));
 
 			/* fetch the keypair we just created / updated */
 			Keypair fetchedKeypair = iaasApi.getKeyPair(newKeypair.getName());
@@ -144,7 +145,7 @@ public static void main(String[] args) throws IOException {
 
 			/* fetch details about a machine type */
 			MachineType fetchedMachineType =
-					iaasApi.getMachineType(projectId, machineTypes.getItems().getFirst().getName());
+					iaasApi.getMachineType(projectId, machineTypes.getItems().get(0).getName());
 			System.out.println("\nFetched machine type: ");
 			System.out.println("* Name: " + fetchedMachineType.getName());
 			System.out.println("* Description: " + fetchedMachineType.getDescription());
@@ -163,7 +164,7 @@ public static void main(String[] args) throws IOException {
 									.name("java-sdk-example-server-01")
 									.machineType("t2i.1")
 									.imageId(imageId)
-									.labels(Map.ofEntries(Map.entry("foo", "bar")))
+									.labels(Collections.singletonMap("foo", "bar"))
 									// add the keypair we created above
 									.keypairName(newKeypair.getName())
 									// add the server to the network we created above
@@ -188,7 +189,7 @@ public static void main(String[] args) throws IOException {
 					projectId,
 					newServer.getId(),
 					new UpdateServerPayload()
-							.labels(Map.ofEntries(Map.entry("foo", "bar-updated"))));
+							.labels(Collections.singletonMap("foo", "bar-updated")));
 
 			/* list all servers */
 			ServerListResponse servers = iaasApi.listServers(projectId, false, null);

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

@@ -7,6 +7,7 @@
 import cloud.stackit.sdk.resourcemanager.model.FolderResponse;
 import cloud.stackit.sdk.resourcemanager.model.Project;
 import java.io.IOException;
+import java.util.Collections;
 import java.util.Map;
 import java.util.UUID;
 
@@ -25,14 +26,14 @@ public static void main(String[] args) throws IOException {
 					resourceManagerApi.createProject(
 							new CreateProjectPayload()
 									.containerParentId(containerParentId.toString())
-									.labels(Map.ofEntries(Map.entry("foo", "bar"))));
+									.labels(Collections.singletonMap("foo", "bar")));
 
 			/* create a folder */
 			FolderResponse folder =
 					resourceManagerApi.createFolder(
 							new CreateFolderPayload()
 									.containerParentId(containerParentId.toString())
-									.labels(Map.ofEntries(Map.entry("foo", "bar"))));
+									.labels(Collections.singletonMap("foo", "bar")));
 		} catch (ApiException e) {
 			throw new RuntimeException(e);
 		}