Expected URL scheme 'http' or 'https' but no scheme was found for /api/v...

[Memo2782]

Hi

In the following days i have tried to setup and environmment where i can fetch kuerbenetes secrets and test them in junit, however in java kubernetes client i have faced some challenges in how to retrieve information about, in this case this is the code i am trying to test

package ocpm.certificatemanagement.service;

import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1Secret;
import org.junit.Test;
import org.mockito.Mockito;

import static org.junit.jupiter.api.Assertions.;
import static org.mockito.Mockito.;

public class KubernetesSecretFetcherTest {

@Test
public void testFetchSecret() throws Exception {
    // Mock CoreV1Api
    CoreV1Api mockApi = mock(CoreV1Api.class);
    mockApi = new CoreV1Api();

    // Create a mock secret
    V1Secret mockSecret = new V1Secret();
    mockSecret.putDataItem("username", "admin".getBytes());
    mockSecret.putDataItem("password", "secret".getBytes());

    // Mock API response
    when(mockApi.readNamespacedSecret("example-secret", "default").execute()).thenReturn(mockSecret);

    // Call the mocked API method
    V1Secret secret = mockApi.readNamespacedSecret("example-secret", "default").execute();

    // Assertions
    assertNotNull(secret);
    assertEquals("admin", new String(secret.getData().get("username")));
    assertEquals("secret", new String(secret.getData().get("password")));
}

}

This code is returning back a error such as the following one

Expected URL scheme 'http' or 'https' but no scheme was found for /api/v...
java.lang.IllegalArgumentException: Expected URL scheme 'http' or 'https' but no scheme was found for /api/v...
at okhttp3.HttpUrl$Builder.parse$okhttp(HttpUrl.kt:1261)
at okhttp3.HttpUrl$Companion.get(HttpUrl.kt:1634)
at okhttp3.Request$Builder.url(Request.kt:184)
at io.kubernetes.client.openapi.ApiClient.buildRequest(ApiClient.java:1192)
at io.kubernetes.client.openapi.ApiClient.buildCall(ApiClient.java:1138)
at io.kubernetes.client.openapi.apis.CoreV1Api.readNamespacedSecretCall(CoreV1Api.java:41761)
at io.kubernetes.client.openapi.apis.CoreV1Api.readNamespacedSecretValidateBeforeCall(CoreV1Api.java:41776)
at io.kubernetes.client.openapi.apis.CoreV1Api.readNamespacedSecretWithHttpInfo(CoreV1Api.java:41782)
at io.kubernetes.client.openapi.apis.CoreV1Api$APIreadNamespacedSecretRequest.execute(CoreV1Api.java:41843)
at ocpm.certificatemanagement.service.KubernetesSecretFetcherTest.testFetchSecret(KubernetesSecretFetcherTest.java:25)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:61)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:108)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:57)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:39)
at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:52)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at jdk.proxy2/jdk.proxy2.$Proxy5.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:113)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:65)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)

OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended

This the implementation code tried to be tested

package ocpm.certificatemanagement.service;

import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1Secret;

public class KubernetesSecretFetcher {

public static V1Secret fetchSecret(String namespace, String secretName, ApiClient client) throws ApiException {
    // Use the provided client
    CoreV1Api api = new CoreV1Api(client);

    // Fetch the secret
    return api.readNamespacedSecret(secretName, namespace).execute();
}

public static void main(String[] args) {
    try {
        // Configure TLS
        ApiClient client = KubernetesTLSConfigurator.configureTls(
                "/path/to/ca.crt",         // Path to CA certificate
                "/path/to/client.crt",     // Path to client certificate
                "/path/to/client.key"      // Path to client key
        );

        // Fetch secret securely
        String namespace = "default";
        String secretName = "example-secret";

        V1Secret secret = fetchSecret(namespace, secretName, client);

        if (secret != null && secret.getData() != null) {
            secret.getData().forEach((key, value) -> {
                System.out.println(key + ": " + new String(value));
            });
        } else {
            System.out.println("Secret not found or has no data.");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

[Memo2782]

This is reference as well with a issue reference #3859 i hope you can guide on it to sort it out

[yue9944882]

    CoreV1Api mockApi = mock(CoreV1Api.class);

hey @Memo2782, you're hitting the error because the entire CoreV1Api class is mocked from the top. it's not the recommended way to write unit-tests for mocking client. a better alternative is to use wire-mock in your unit tests

[Memo2782]

hi @yue9944882 any example how? cause i have used wire-mock but for usage in HTTP, i have never used for mocking kubernetes, in addition i have try to look at the documentation and looks like this one still not available here https://javadoc.io/doc/io.kubernetes/client-java/21.0.1/index.html, that is making just work in a blind side,

[brendandburns]

There are lots of examples of how to use WireMock, here's one:

https://github.com/kubernetes-client/java/blob/master/util/src/test/java/io/kubernetes/client/PodLogsTest.java

Also, in this case, I think that the problem is that you re-assign mockAPI to be a real instance of the CoreV1API class in the second line of your code:

 mockApi = new CoreV1Api();

But @yue9944882 is right, the correct way to test is to mock the actual HTTP calls.