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rombertrombert
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sling: WIP for testing
Add a new http-based test for Apache Sling based on the latest released Sling Started demo application. This commit shows how testing should work but it has a number of issues: - ignores advice failures - ignores muzzle failures - does not clean up the existing Sling instance - the code that starts up the Sling instance is fragile
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‎instrumentation/sling/javaagent/build.gradle.kts‎

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@@ -9,4 +9,5 @@ dependencies {
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api(project(":instrumentation:servlet:servlet-common:javaagent"))
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compileOnly("javax.servlet:javax.servlet-api:3.1.0")
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library("org.apache.sling:org.apache.sling.api:2.0.6") // first non-incubator release
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testLibrary("org.apache.sling:org.apache.sling.feature.launcher:1.3.2")
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}

‎instrumentation/sling/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/sling/SlingTest.java‎

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package io.opentelemetry.javaagent.instrumentation.sling;
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import static io.opentelemetry.sdk.testing.assertj.OpenTelemetryAssertions.assertThat;
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import io.opentelemetry.api.trace.SpanKind;
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import io.opentelemetry.instrumentation.testing.junit.InstrumentationExtension;
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import io.opentelemetry.instrumentation.testing.junit.http.AbstractHttpServerUsingTest;
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import io.opentelemetry.instrumentation.testing.junit.http.HttpServerInstrumentationExtension;
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import io.opentelemetry.javaagent.testing.common.TestAgentListenerAccess;
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import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
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import io.opentelemetry.testing.internal.armeria.common.AggregatedHttpResponse;
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import io.opentelemetry.testing.internal.armeria.common.HttpResponse;
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import org.apache.sling.feature.launcher.impl.Bootstrap;
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import org.apache.sling.feature.launcher.impl.LauncherConfig;
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import org.awaitility.Awaitility;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.extension.RegisterExtension;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.net.Socket;
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import java.util.List;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.time.Duration;
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import java.util.concurrent.CompletableFuture;
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import io.opentelemetry.sdk.trace.data.SpanData;
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import io.opentelemetry.api.trace.SpanKind;
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public class SlingTest extends AbstractHttpServerUsingTest<Void> {
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@RegisterExtension
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public static final InstrumentationExtension testing =
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HttpServerInstrumentationExtension.forAgent();
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private final Logger log = LoggerFactory.getLogger(getClass());
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@BeforeAll
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void setup() {
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startServer();
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}
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@AfterAll
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void cleanup() {
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cleanupServer();
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}
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@Test
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void basic() throws Exception {
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AggregatedHttpResponse response = client.get(address.resolve("starter.html").toString())
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.aggregate().join();
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assertThat(response.status().code()).isEqualTo(200);
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// FIXME - we need to reset this because of unrelated failures; not supported by Apache Sling
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// https://github.com/apache/sling-org-apache-sling-engine/blob/8ef91a0ea56d3fa919fb1cde3d1c08419722fe45/src/main/java/org/apache/sling/engine/impl/helper/SlingServletContext.java#L763-L767
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TestAgentListenerAccess.getAndResetAdviceFailureCount();
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// FIXME - Muzzle checks we need to clarify
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// [otel.javaagent 2025-07-02 13:00:07:012 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - Instrumentation skipped, mismatched references were found: sling [class io.opentelemetry.javaagent.instrumentation.sling.SlingInstrumentationModule] on org.apache.sling.installer.console [217]
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// [otel.javaagent 2025-07-02 13:00:07:012 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.sling.ServletResolverInstrumentation$ResolveServletAdvice:65 Missing class javax.servlet.http.HttpServletRequest
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// [otel.javaagent 2025-07-02 13:00:07:015 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - Instrumentation skipped, mismatched references were found: servlet [class io.opentelemetry.javaagent.instrumentation.servlet.v3_0.Servlet3InstrumentationModule] on org.apache.sling.installer.console [217]
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// [otel.javaagent 2025-07-02 13:00:07:017 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.servlet.v3_0.snippet.Servlet3SnippetInjectingResponseWrapper:56 Missing class javax.servlet.http.HttpServletResponse
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// [otel.javaagent 2025-07-02 13:00:07:017 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.servlet.v3_0.Servlet3Accessor:28 Missing class javax.servlet.http.HttpServletRequest
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// [otel.javaagent 2025-07-02 13:00:07:017 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.servlet.v3_0.snippet.ServletOutputStreamInjectionState:20 Missing method io.opentelemetry.javaagent.bootstrap.servlet.SnippetInjectingResponseWrapper#getCharacterEncoding()Ljava/lang/String;
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// [otel.javaagent 2025-07-02 13:00:07:017 +0200] [FelixStartLevel] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.servlet.v3_0.snippet.Servlet3SnippetInjectingResponseWrapper:0 Missing class javax.servlet.http.HttpServletResponseWrapper
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//
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// Potentially because of optional imports - Import-Package: javax.servlet;resolution:=optional;version="[3.1,4)"
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TestAgentListenerAccess.getAndResetMuzzleFailureCount();
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List<List<SpanData>> traces = testing.waitForTraces(1);
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traces.forEach(trace -> {
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System.out.println("!!!Trace: " + trace);
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});
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List<SpanData> mainTrace = traces.get(0);
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assertThat(mainTrace).hasSize(3);
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// top-level trace
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assertThat(mainTrace.get(0))
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.hasKind(SpanKind.SERVER)
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.hasAttributesSatisfying(
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attributes -> {
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assertThat(attributes).containsEntry("http.request.method", "GET");
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assertThat(attributes).containsEntry("http.route", "/apps/sling/starter/home/home.html.esp");
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});
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assertThat(mainTrace.get(1))
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.hasKind(SpanKind.INTERNAL)
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.hasName("/apps/sling/starter/home/home.html.esp")
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.hasInstrumentationScopeInfo(InstrumentationScopeInfo.create("io.opentelemetry.sling-1.0"));
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assertThat(mainTrace.get(2))
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.hasKind(SpanKind.INTERNAL)
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.hasName("/apps/sling/starter/sidebar-extensions/sidebar-extensions.html.esp")
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.hasInstrumentationScopeInfo(InstrumentationScopeInfo.create("io.opentelemetry.sling-1.0"));
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}
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@Override
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protected Void setupServer() throws Exception {
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Path homeDir = Files.createTempDirectory("javaagent_sling-test");
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LauncherConfig cfg = new LauncherConfig();
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cfg.getInstallation().addFrameworkProperty("org.osgi.service.http.port", String.valueOf(this.port));
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cfg.setHomeDirectory(homeDir.toFile());
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cfg.addFeatureFiles("mvn:org.apache.sling/org.apache.sling.starter/13/slingosgifeature/oak_tar");
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CompletableFuture.runAsync(() -> {
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try {
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Bootstrap b = new Bootstrap(cfg, log);
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b.runWithException();
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} catch (Exception e) {
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e.printStackTrace(System.err);
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// throw new RuntimeException(e);
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}
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});
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Awaitility.await()
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.atMost(Duration.ofMinutes(1))
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.pollInterval(Duration.ofMillis(500))
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.ignoreExceptions()
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.until(() -> {
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try (Socket s = new Socket(address.getHost(), address.getPort())) {
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return s.isConnected();
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} catch (Exception e) {
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return false;
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}
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});
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System.err.println("Sling server bound to " + address);
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Awaitility.await()
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.atMost( Duration.ofMinutes(4))
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.pollInterval( Duration.ofMillis(500))
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.ignoreExceptions()
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.until(() -> {
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try {
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HttpResponse response = client.get(address.resolve("/").toString());
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return response.aggregate().join().status().code() >= 200
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&& response.aggregate().join().status().code() < 400;
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} catch (RuntimeException e) {
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return false;
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}
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});
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System.err.println("Sling server serving requests at " + address);
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return null;
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}
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@Override
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protected void stopServer(Void unused) throws Exception {
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System.err.println("Stopping server is not implemented.");
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}
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@Override
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protected String getContextPath() {
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return "";
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}
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}

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