Minor changes to startup code (#5992)

* Minor changes to startup code

* Fix test

javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/AgentInstaller.java

@@ -28,12 +28,10 @@ import io.opentelemetry.javaagent.bootstrap.DefineClassHelper;
 import io.opentelemetry.javaagent.bootstrap.InstrumentedTaskClasses;
 import io.opentelemetry.javaagent.extension.AgentListener;
 import io.opentelemetry.javaagent.extension.ignore.IgnoredTypesConfigurer;
-import io.opentelemetry.javaagent.extension.instrumentation.InstrumentationModule;
 import io.opentelemetry.javaagent.tooling.asyncannotationsupport.WeakRefAsyncOperationEndStrategies;
 import io.opentelemetry.javaagent.tooling.bootstrap.BootstrapPackagesBuilderImpl;
 import io.opentelemetry.javaagent.tooling.bootstrap.BootstrapPackagesConfigurer;
 import io.opentelemetry.javaagent.tooling.config.AgentConfig;
-import io.opentelemetry.javaagent.tooling.config.ConfigInitializer;
 import io.opentelemetry.javaagent.tooling.ignore.IgnoredClassLoadersMatcher;
 import io.opentelemetry.javaagent.tooling.ignore.IgnoredTypesBuilderImpl;
 import io.opentelemetry.javaagent.tooling.ignore.IgnoredTypesMatcher;
@@ -60,7 +58,7 @@ import net.bytebuddy.utility.JavaModule;
 
 public class AgentInstaller {
 
-  private static final Logger logger;
+  private static final Logger logger = Logger.getLogger(AgentInstaller.class.getName());
 
   static final String JAVAAGENT_ENABLED_CONFIG = "otel.javaagent.enabled";
   static final String JAVAAGENT_NOOP_CONFIG = "otel.javaagent.experimental.use-noop-api";
@@ -77,50 +75,33 @@ public class AgentInstaller {
 
   private static final Map<String, List<Runnable>> CLASS_LOAD_CALLBACKS = new HashMap<>();
 
-  static {
-    LoggingConfigurer.configureLogger();
-    logger = Logger.getLogger(AgentInstaller.class.getName());
-
+  public static void installBytebuddyAgent(Instrumentation inst, Config config) {
     addByteBuddyRawSetting();
-    // this needs to be done as early as possible - before the first Config.get() call
-    ConfigInitializer.initialize();
 
     Integer strictContextStressorMillis = Integer.getInteger(STRICT_CONTEXT_STRESSOR_MILLIS);
     if (strictContextStressorMillis != null) {
       io.opentelemetry.context.ContextStorage.addWrapper(
           storage -> new StrictContextStressor(storage, strictContextStressorMillis));
     }
-  }
 
-  public static void installBytebuddyAgent(Instrumentation inst) {
     logVersionInfo();
-    Config config = Config.get();
     if (config.getBoolean(JAVAAGENT_ENABLED_CONFIG, true)) {
       setupUnsafe(inst);
       List<AgentListener> agentListeners = loadOrdered(AgentListener.class);
-      installBytebuddyAgent(inst, agentListeners);
+      installBytebuddyAgent(inst, config, agentListeners);
     } else {
       logger.fine("Tracing is disabled, not installing instrumentations.");
     }
   }
 
-  /**
-   * Install the core bytebuddy agent along with all implementations of {@link
-   * InstrumentationModule}.
-   *
-   * @param inst Java Instrumentation used to install bytebuddy
-   * @return the agent's class transformer
-   */
-  public static ResettableClassFileTransformer installBytebuddyAgent(
-      Instrumentation inst, Iterable<AgentListener> agentListeners) {
+  private static void installBytebuddyAgent(
+      Instrumentation inst, Config config, Iterable<AgentListener> agentListeners) {
 
     WeakRefAsyncOperationEndStrategies.initialize();
 
     EmbeddedInstrumentationProperties.setPropertiesLoader(
         AgentInitializer.getExtensionsClassLoader());
 
-    Config config = Config.get();
-
     setBootstrapPackages(config);
     setDefineClassHandler();
 
@@ -192,8 +173,6 @@ public class AgentInstaller {
     if (autoConfiguredSdk != null) {
       runAfterAgentListeners(agentListeners, config, autoConfiguredSdk);
     }
-
-    return resettableClassFileTransformer;
   }
 
   private static void setupUnsafe(Instrumentation inst) {

javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/AgentStarterImpl.java

@@ -5,8 +5,10 @@
 
 package io.opentelemetry.javaagent.tooling;
 
+import io.opentelemetry.instrumentation.api.config.Config;
 import io.opentelemetry.javaagent.bootstrap.AgentInitializer;
 import io.opentelemetry.javaagent.bootstrap.AgentStarter;
+import io.opentelemetry.javaagent.tooling.config.ConfigInitializer;
 import java.io.File;
 import java.lang.instrument.ClassFileTransformer;
 import java.lang.instrument.Instrumentation;
@@ -62,7 +64,10 @@ public class AgentStarterImpl implements AgentStarter {
     ClassLoader savedContextClassLoader = Thread.currentThread().getContextClassLoader();
     try {
       Thread.currentThread().setContextClassLoader(extensionClassLoader);
-      AgentInstaller.installBytebuddyAgent(instrumentation);
+      // setting up logging and configuration need to be done as early as possible
+      LoggingConfigurer.configureLogger();
+      ConfigInitializer.initialize();
+      AgentInstaller.installBytebuddyAgent(instrumentation, Config.get());
     } finally {
       Thread.currentThread().setContextClassLoader(savedContextClassLoader);
     }

javaagent-tooling/src/test/groovy/io/opentelemetry/javaagent/test/HelperInjectionTest.groovy

@@ -5,6 +5,7 @@
 
 package io.opentelemetry.javaagent.test
 
+import io.opentelemetry.instrumentation.api.config.Config
 import io.opentelemetry.javaagent.tooling.AgentInstaller
 import io.opentelemetry.javaagent.tooling.HelperInjector
 import io.opentelemetry.javaagent.tooling.Utils
@@ -60,7 +61,7 @@ class HelperInjectionTest extends Specification {
   def "helpers injected on bootstrap classloader"() {
     setup:
     ByteBuddyAgent.install()
-    AgentInstaller.installBytebuddyAgent(ByteBuddyAgent.getInstrumentation())
+    AgentInstaller.installBytebuddyAgent(ByteBuddyAgent.getInstrumentation(), Config.get())
     String helperClassName = HelperInjectionTest.getPackage().getName() + '.HelperClass'
     HelperInjector injector = new HelperInjector("test", [helperClassName], [], this.class.classLoader, ByteBuddyAgent.getInstrumentation())
     URLClassLoader bootstrapChild = new URLClassLoader(new URL[0], (ClassLoader) null)