Enable http pipelining tests for jaxrs-2.0-resteasy (#8425)

instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-resteasy-3.0/javaagent/build.gradle.kts

@@ -46,6 +46,7 @@ dependencies {
 
   testInstrumentation(project(":instrumentation:servlet:servlet-3.0:javaagent"))
   testInstrumentation(project(":instrumentation:servlet:servlet-javax-common:javaagent"))
+  testInstrumentation(project(":instrumentation:undertow-1.4:javaagent"))
 
   testImplementation(project(":instrumentation:jaxrs:jaxrs-2.0:jaxrs-2.0-common:testing"))
   testImplementation("org.eclipse.jetty:jetty-webapp:9.4.6.v20170531")

instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-resteasy-3.0/javaagent/src/test/groovy/ResteasyHttpServerTest.groovy

@@ -33,9 +33,4 @@ class ResteasyHttpServerTest extends JaxRsHttpServerTest<UndertowJaxrsServer> {
   boolean shouldTestCompletableStageAsync() {
     false
   }
-
-  @Override
-  boolean testHttpPipelining() {
-    false
-  }
 }

instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-resteasy-3.1/javaagent/build.gradle.kts

@@ -44,6 +44,7 @@ dependencies {
 
   testInstrumentation(project(":instrumentation:servlet:servlet-3.0:javaagent"))
   testInstrumentation(project(":instrumentation:servlet:servlet-javax-common:javaagent"))
+  testInstrumentation(project(":instrumentation:undertow-1.4:javaagent"))
 
   testImplementation(project(":instrumentation:jaxrs:jaxrs-2.0:jaxrs-2.0-common:testing"))
   testImplementation("org.eclipse.jetty:jetty-webapp:9.4.6.v20170531")

instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-resteasy-3.1/javaagent/src/test/groovy/ResteasyHttpServerTest.groovy

@@ -27,9 +27,4 @@ class ResteasyHttpServerTest extends JaxRsHttpServerTest<UndertowJaxrsServer> {
   void stopServer(UndertowJaxrsServer server) {
     server.stop()
   }
-
-  @Override
-  boolean testHttpPipelining() {
-    false
-  }
 }

instrumentation/undertow-1.4/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/undertow/UndertowInstrumentationModule.java

@@ -5,12 +5,14 @@
 
 package io.opentelemetry.javaagent.instrumentation.undertow;
 
+import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
 import static java.util.Arrays.asList;
 
 import com.google.auto.service.AutoService;
 import io.opentelemetry.javaagent.extension.instrumentation.InstrumentationModule;
 import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
 import java.util.List;
+import net.bytebuddy.matcher.ElementMatcher;
 
 @AutoService(InstrumentationModule.class)
 public class UndertowInstrumentationModule extends InstrumentationModule {
@@ -19,6 +21,12 @@ public class UndertowInstrumentationModule extends InstrumentationModule {
     super("undertow", "undertow-1.4");
   }
 
+  @Override
+  public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
+    // class added in 1.4.0
+    return hasClassesNamed("io.undertow.Undertow$ListenerInfo");
+  }
+
   @Override
   public List<TypeInstrumentation> typeInstrumentations() {
     return asList(