PR comments addressed

Author: kcsurapaneni

docs/supported-libraries.md

@@ -158,6 +158,7 @@ These are the supported libraries and frameworks:
 | [Vibur DBCP](https://www.vibur.org/)                                                                                                        | 11.0+                              | [opentelemetry-vibur-dbcp-11.0](../instrumentation/vibur-dbcp-11.0/library)                                                                                                                                                                                                                                                                                                             | [Database Pool Metrics]                                                                                                                 |
 | [XXL-JOB](https://www.xuxueli.com/xxl-job/en/)                                                                                              | 1.9.2+                             | N/A                                                                                                                                                                                                                                                                                                                                                                                     | none                                                                                                                                    |
 | [ZIO](https://zio.dev/)                                                                                                                     | 2.0+                               | N/A                                                                                                                                                                                                                                                                                                                                                                                     | Context propagation                                                                                                                     |
+| [ActiveJ](https://activej.io/)                                                                                                                 | 6.0+                               | N/A                                                                                                                                                                                                                                                                                                                                                                                     | [HTTP Server Spans]                                                                                                                     |
 
 **[1]** Standalone library instrumentation refers to instrumentation that can be used without the Java agent.
 

instrumentation/activej-http-6.0/javaagent/build.gradle.kts

@@ -6,7 +6,6 @@ muzzle {
   pass {
     group.set("io.activej:activej-http")
     module.set("activej-http")
-
     versions.set("[6.0,)")
     assertInverse.set(true)
   }

instrumentation/activej-http-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/activejhttp/ActivejHttpServerConnectionSingletons.java

@@ -10,7 +10,7 @@
 import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
 import io.opentelemetry.javaagent.bootstrap.internal.JavaagentHttpServerInstrumenters;
 
-public class ActivejHttpServerConnectionSingletons {
+public final class ActivejHttpServerConnectionSingletons {
 
   private static final String INSTRUMENTATION_NAME = "io.opentelemetry.activej-http-6.0";
 

instrumentation/activej-http-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/activejhttp/ActivejHttpServerHeaders.java

@@ -14,16 +14,13 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 
 enum ActivejHttpServerHeaders implements ExtendedTextMapGetter<HttpRequest> {
   INSTANCE;
 
   @Override
   public Iterable<String> keys(HttpRequest httpRequest) {
-    return httpRequest.getHeaders().stream()
-        .map(h -> h.getKey().toString())
-        .collect(Collectors.toList());
+    return httpRequest.getHeaders().stream().map(h -> h.getKey().toString()).toList();
   }
 
   @Override

instrumentation/activej-http-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/activejhttp/ActivejHttpServerUtil.java

@@ -5,13 +5,14 @@
 
 package io.opentelemetry.javaagent.instrumentation.activejhttp;
 
-import io.activej.http.HttpError;
+import static io.activej.http.HttpError.internalServerError500;
+import static java.util.Collections.emptyList;
+
 import io.activej.http.HttpHeaders;
 import io.activej.http.HttpRequest;
 import io.activej.http.HttpResponse;
 import io.activej.http.HttpVersion;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 import javax.annotation.Nullable;
@@ -29,15 +30,15 @@ static String getHttpRequestMethod(HttpRequest request) {
   static List<String> requestHeader(HttpRequest request, String name) {
     String headerValue = request.getHeader(HttpHeaders.of(name));
     if (headerValue == null) {
-      return Collections.emptyList();
+      return emptyList();
     }
     return Arrays.stream(headerValue.split(",")).collect(Collectors.toList());
   }
 
   static Integer getHttpResponseStatusCode(
       HttpRequest request, HttpResponse httpResponse, @Nullable Throwable error) {
     if (error != null && httpResponse.getCode() <= 0) {
-      return HttpError.internalServerError500().getCode();
+      return internalServerError500().getCode();
     }
     return httpResponse.getCode();
   }
@@ -46,7 +47,7 @@ static List<String> getHttpResponseHeader(
       HttpRequest request, HttpResponse httpResponse, String name) {
     String headerValue = httpResponse.getHeader(HttpHeaders.of(name));
     if (headerValue == null) {
-      return Collections.emptyList();
+      return emptyList();
     }
     return Arrays.stream(headerValue.split(",")).toList();
   }