diff --git a/.github/workflows/gradle-build.yml b/.github/workflows/gradle-build.yml
index 8be8d8d..7344861 100644
--- a/.github/workflows/gradle-build.yml
+++ b/.github/workflows/gradle-build.yml
@@ -14,12 +14,12 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: actions/setup-java@v3
         with:
-          java-version: '8'
+          java-version: '11'
           distribution: 'temurin'
       - name: Set up Gradle Build Action
         uses: gradle/gradle-build-action@v2
-      - name: Build with Gradle
+      - name: Build and test with Gradle
         run: ./gradlew build
diff --git a/README.md b/README.md
index 303f260..6cca642 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,11 @@ $ ./gradlew install
 This builds and installs the program into `build/install/gradle-enterprise-api-samples`.
 You can use the `build/install/gradle-enterprise-api-samples/bin/gradle-enterprise-api-samples` script to run the sample.
 
+### Note on Java 11
+
+The current version of the OpenAPI generator requires Java 11 to generate the client code. Even though this sample uses Java 11 to generate the client, but the generated **client code is based on Java 8**.
+Therefore, the generated client is still compatible with Java 8 based projects.
+
 ## How to run
 
 A Gradle Enterprise access key with the “Export build data via the API” permission is required.
@@ -55,7 +60,6 @@ The sample code can be found [here](https://github.com/gradle/gradle-enterprise-
 
 The Gradle Enterprise API manual and reference documentation for each version of the API can be found [here](https://docs.gradle.com/enterprise/api-manual).
 
-
 ## License
 
 The Gradle Enterprise API Samples project is open-source software released under the [Apache 2.0 License][apache-license].
diff --git a/build.gradle.kts b/build.gradle.kts
index 4de3234..2bc7d70 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,8 +1,10 @@
+import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.util.distsDirectory
+
 group = "com.gradle.enterprise.api"
 description = "Gradle Enterprise API sample"
 
 plugins {
-    id("org.openapi.generator") version "6.6.0"
+    id("org.openapi.generator") version "7.0.0"
     kotlin("jvm") version embeddedKotlinVersion apply false
     `java-library`
     application
@@ -17,8 +19,9 @@ application {
 }
 
 java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(8))
+        languageVersion.set(JavaLanguageVersion.of(11))
     }
 }
 
@@ -32,18 +35,25 @@ dependencies {
     implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.15.2")
     implementation("com.google.code.findbugs:jsr305:3.0.2")
     implementation("org.apache.httpcomponents.client5:httpclient5:5.2.1")
+
+    testImplementation("org.mock-server:mockserver-netty:5.15.0")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.7.1")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+
 }
 
 val gradleEnterpriseVersion = "2023.2" // Must be later than 2022.1
 val baseApiUrl = providers.gradleProperty("apiManualUrl").orElse("https://docs.gradle.com/enterprise/api-manual/ref/")
 
 val apiSpecificationFileGradleProperty = providers.gradleProperty("apiSpecificationFile")
+val apiSpecificationURL = baseApiUrl.map { "${it}gradle-enterprise-${gradleEnterpriseVersion}-api.yaml" }
 val apiSpecificationFile = apiSpecificationFileGradleProperty
     .map { s -> file(s) }
-    .orElse(objects.property(File::class)
-        .convention(provider {
-            resources.text.fromUri("${baseApiUrl.get()}gradle-enterprise-${gradleEnterpriseVersion}-api.yaml").asFile()
-        })
+    .orElse(
+        objects.property(File::class)
+            .convention(provider {
+                resources.text.fromUri(apiSpecificationURL).asFile()
+            })
     ).map { file -> file.absolutePath }
 
 val basePackageName = "com.gradle.enterprise.api"
@@ -73,6 +83,17 @@ openApiGenerate {
     ))
 }
 
+tasks.test {
+    useJUnitPlatform()
+
+    apiSpecificationURL.orNull.let { systemProperties["ge.api.url"] = it }
+
+
+    javaLauncher.set(javaToolchains.launcherFor {
+        languageVersion.set(JavaLanguageVersion.of(8))
+    })
+}
+
 sourceSets {
     main {
         java {
diff --git a/src/test/java/com/gradle/enterprise/api/SimpleApiClientTest.java b/src/test/java/com/gradle/enterprise/api/SimpleApiClientTest.java
new file mode 100644
index 0000000..366d125
--- /dev/null
+++ b/src/test/java/com/gradle/enterprise/api/SimpleApiClientTest.java
@@ -0,0 +1,52 @@
+package com.gradle.enterprise.api;
+
+import com.gradle.enterprise.api.client.ApiClient;
+import com.gradle.enterprise.api.client.ApiException;
+import com.gradle.enterprise.api.client.ServerConfiguration;
+import com.gradle.enterprise.api.model.Build;
+import com.gradle.enterprise.api.model.BuildsQuery;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockserver.configuration.Configuration;
+import org.mockserver.integration.ClientAndServer;
+import org.mockserver.logging.MockServerLogger;
+import org.mockserver.mock.Expectation;
+import org.mockserver.openapi.OpenAPIConverter;
+
+import java.net.InetSocketAddress;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+public class SimpleApiClientTest {
+
+    private static final String gradleEnterpriseAPIYamlUrl = System.getProperty("ge.api.url");
+
+    private ClientAndServer mockServer;
+
+    @BeforeEach
+    public void setup() {
+        Configuration configuration = Configuration.configuration();
+        List<Expectation> openApiExpectations = new OpenAPIConverter(new MockServerLogger()).buildExpectations(gradleEnterpriseAPIYamlUrl, null);
+        mockServer = ClientAndServer.startClientAndServer(configuration, Collections.singletonList(19234));
+        mockServer.upsert(openApiExpectations.toArray(new Expectation[0]));
+    }
+
+    @Test
+    public void testSimpleAPICall() throws ApiException {
+        InetSocketAddress remoteAddress = mockServer.remoteAddress();
+
+        ApiClient apiClient = new ApiClient();
+        apiClient.setServers(Collections.singletonList(new ServerConfiguration(
+            "http://" + remoteAddress.getHostName() + ":" + remoteAddress.getPort(), "mockServer", Collections.emptyMap()
+        )));
+        BuildsApi buildsApi = new BuildsApi(apiClient);
+        apiClient.addDefaultHeader("Authorization", "Bearer XYZ");
+
+        List<Build> builds = buildsApi.getBuilds(new BuildsQuery());
+
+        assertFalse(builds.isEmpty());
+    }
+}