Remove the use of fixed ports

Author: psx95

javaagent-extensions/gcp-auth/src/test/java/com/google/cloud/opentelemetry/extension/auth/ExtensionIntegrationTest.java

@@ -44,17 +44,21 @@ public void smokeTest() throws IOException, InterruptedException {
       throw new RuntimeException(e);
     }
     backendServer.start();
+    int backendServerPort = backendServer.getAddress().getPort();
+    System.out.println("Started OTLP HTTP Endpoint on localhost:" + backendServerPort);
     Process p =
         new ProcessBuilder(
                 "java",
                 "-javaagent:" + javaAgentJarPath,
                 "-Dotel.javaagent.extensions=" + authExtensionJarPath,
-                "-Dotel.java.global-autoconfigure.enabled=true",
                 "-Dgoogle.cloud.project=dummy-test-project",
-                "-Dotel.exporter.otlp.endpoint=http://localhost:4318",
+                "-Dotel.java.global-autoconfigure.enabled=true",
+                "-Dotel.javaagent.logging=none",
+                "-Dotel.exporter.otlp.endpoint=http://localhost:" + backendServerPort,
                 "-Dotel.exporter.otlp.insecure=true",
-                "-Dotel.traces.exporter=otlp,logging",
+                "-Dotel.traces.exporter=otlp",
                 "-Dotel.metrics.exporter=none",
+                "-Dotel.logs.exporter=none",
                 "-Dotel.javaagent.debug=false",
                 "-Dotel.exporter.otlp.protocol=http/protobuf",
                 "-jar",

javaagent-extensions/gcp-auth/src/test/java/com/google/cloud/opentelemetry/extension/auth/testapp/InstrumentedTestApp.java

@@ -28,12 +28,11 @@
 
 public class InstrumentedTestApp {
   private static final String serverUrl = "http://localhost:%d/%s";
-  private static final int defaultPort = 8080;
 
   public static void main(String[] args) throws IOException, InterruptedException {
-    int port = parsePort(args);
-
-    HttpServer server = HttpServer.create(new InetSocketAddress(port), 0);
+    int port;
+    HttpServer server = HttpServer.create(new InetSocketAddress(0), 0);
+    port = server.getAddress().getPort();
     server.createContext("/doWork", new TestHandler());
     server.createContext(
         "/stop",
@@ -48,7 +47,7 @@ public static void main(String[] args) throws IOException, InterruptedException
         });
     server.setExecutor(null); // creates a default executor
     server.start();
-    System.out.println("Server ready");
+    System.out.println("Starting Server at port " + port);
     System.out.println("Sending request to do work ...");
     makeCall(String.format(serverUrl, port, "doWork"));
     Thread.sleep(1000);
@@ -72,21 +71,4 @@ private static void makeCall(String url) {
       System.err.println("Error making request: " + e.getMessage());
     }
   }
-
-  private static int parsePort(String[] args) {
-    int port;
-    if (args.length > 0) {
-      try {
-        port = Integer.parseInt(args[0]);
-        if (port < 0 || port > 65535) {
-          throw new NumberFormatException("Port number must be between 0 and 65535");
-        }
-        return port;
-      } catch (NumberFormatException e) {
-        System.err.println("Invalid port number provided: " + args[0]);
-        System.err.println("Using default port: " + defaultPort);
-      }
-    }
-    return defaultPort;
-  }
 }

javaagent-extensions/gcp-auth/src/test/java/com/google/cloud/opentelemetry/extension/auth/testbackend/DummyOTelHttpEndpoint.java

@@ -32,9 +32,7 @@ public class DummyOTelHttpEndpoint {
   public static Map<String, Boolean> receivedRequests = new HashMap<>();
 
   public static HttpServer createTestServer() throws IOException {
-    int port = 4318; // Use a different port than gRPC (e.g., 4318)
-
-    HttpServer server = HttpServer.create(new InetSocketAddress(port), 0);
+    HttpServer server = HttpServer.create(new InetSocketAddress(0), 0);
     server.createContext("/v1/traces", new TraceHandler()); // Handle traces
     server.setExecutor(null); // Use default thread pool
     return server;