Extract agent shadow configuration to conventions script.

build.gradle

@@ -12,8 +12,6 @@ plugins {
   id 'org.unbroken-dome.test-sets' apply false
   id 'com.github.ben-manes.versions'
 
-  id "com.github.johnrengelman.shadow" apply false
-
   id "com.diffplug.spotless"
   id "net.ltgt.errorprone" apply false
   id "net.ltgt.nullaway" apply false

buildSrc/build.gradle.kts

@@ -0,0 +1,53 @@
+plugins {
+  `java-gradle-plugin`
+  `kotlin-dsl`
+  id("com.diffplug.spotless") version "5.12.4"
+}
+
+spotless {
+  java {
+    googleJavaFormat("1.10.0")
+    licenseHeaderFile(rootProject.file("../gradle/enforcement/spotless.license.java"), "(package|import|public)")
+    target("src/**/*.java")
+  }
+}
+
+gradlePlugin {
+  plugins {
+    create("muzzle-plugin") {
+      id = "muzzle"
+      implementationClass = "io.opentelemetry.instrumentation.gradle.muzzle.MuzzlePlugin"
+    }
+  }
+}
+
+repositories {
+  mavenCentral()
+  gradlePluginPortal()
+  mavenLocal()
+}
+
+tasks.withType<Test>().configureEach {
+  useJUnitPlatform()
+}
+
+dependencies {
+  implementation(gradleApi())
+  implementation(localGroovy())
+
+  implementation("org.eclipse.aether:aether-connector-basic:1.1.0")
+  implementation("org.eclipse.aether:aether-transport-http:1.1.0")
+  implementation("org.apache.maven:maven-aether-provider:3.3.9")
+
+  implementation("com.google.guava:guava:30.1-jre")
+  implementation("gradle.plugin.com.github.jengelman.gradle.plugins:shadow:7.0.0")
+  implementation("org.ow2.asm:asm:7.0-beta")
+  implementation("org.ow2.asm:asm-tree:7.0-beta")
+  implementation("org.apache.httpcomponents:httpclient:4.5.10")
+  // When updating, also update dependencyManagement/dependencyManagement.gradle.kts
+  implementation("net.bytebuddy:byte-buddy-gradle-plugin:1.11.2")
+
+  testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.1")
+  testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.1")
+  testImplementation("org.assertj:assertj-core:3.19.0")
+}

buildSrc/src/main/kotlin/otel.shadow-conventions.gradle.kts

@@ -0,0 +1,33 @@
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+
+plugins {
+  id("com.github.johnrengelman.shadow")
+}
+
+tasks.withType<ShadowJar>().configureEach {
+  mergeServiceFiles()
+
+  exclude("**/module-info.class")
+
+  // Prevents conflict with other SLF4J instances. Important for premain.
+  relocate("org.slf4j", "io.opentelemetry.javaagent.slf4j")
+  // rewrite dependencies calling Logger.getLogger
+  relocate("java.util.logging.Logger", "io.opentelemetry.javaagent.bootstrap.PatchLogger")
+
+  // prevents conflict with library instrumentation
+  relocate("io.opentelemetry.instrumentation", "io.opentelemetry.javaagent.shaded.instrumentation")
+
+  // relocate(OpenTelemetry API)
+  relocate("io.opentelemetry.api", "io.opentelemetry.javaagent.shaded.io.opentelemetry.api")
+  relocate("io.opentelemetry.semconv", "io.opentelemetry.javaagent.shaded.io.opentelemetry.semconv")
+  relocate("io.opentelemetry.context", "io.opentelemetry.javaagent.shaded.io.opentelemetry.context")
+
+  // relocate(the OpenTelemetry extensions that are used by instrumentation modules)
+  // these extensions live in the AgentClassLoader, and are injected into the user"s class loader
+  // by the instrumentation modules that use them
+  relocate("io.opentelemetry.extension.aws", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.aws")
+  relocate("io.opentelemetry.extension.kotlin", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.kotlin")
+
+  // this is for instrumentation on opentelemetry-api itself
+  relocate("application.io.opentelemetry", "io.opentelemetry")
+}

dependencyManagement/dependencyManagement.gradle.kts

@@ -53,6 +53,7 @@ val DEPENDENCY_SETS = listOf(
   ),
   DependencySet(
     "net.bytebuddy",
+    // When updating, also update buildSrc/build.gradle.kts
     "1.11.2",
     listOf("byte-buddy", "byte-buddy-agent")
   ),

gradle/instrumentation.gradle

@@ -2,7 +2,7 @@
 import io.opentelemetry.instrumentation.gradle.bytebuddy.ByteBuddyPluginConfigurator
 
 apply plugin: 'net.bytebuddy.byte-buddy'
-apply plugin: 'com.github.johnrengelman.shadow'
+apply plugin: 'otel.shadow-conventions'
 
 ext {
   mavenGroupId = 'io.opentelemetry.javaagent.instrumentation'
@@ -85,34 +85,8 @@ configurations {
 
 tasks.named('shadowJar').configure {
   configurations = [project.configurations.runtimeClasspath, project.configurations.testInstrumentation]
-  mergeServiceFiles()
 
   archiveFileName = 'agent-testing.jar'
-
-  // rewrite library instrumentation dependencies
-  relocate "io.opentelemetry.instrumentation", "io.opentelemetry.javaagent.shaded.instrumentation"
-
-  // Prevents conflict with other SLF4J instances. Important for premain.
-  relocate 'org.slf4j', 'io.opentelemetry.javaagent.slf4j'
-  // rewrite dependencies calling Logger.getLogger
-  relocate 'java.util.logging.Logger', 'io.opentelemetry.javaagent.bootstrap.PatchLogger'
-
-  // prevents conflict with library instrumentation
-  relocate 'io.opentelemetry.instrumentation.api', 'io.opentelemetry.javaagent.shaded.instrumentation.api'
-
-  // relocate OpenTelemetry API usage
-  relocate "io.opentelemetry.api", "io.opentelemetry.javaagent.shaded.io.opentelemetry.api"
-  relocate "io.opentelemetry.semconv", "io.opentelemetry.javaagent.shaded.io.opentelemetry.semconv"
-  relocate "io.opentelemetry.context", "io.opentelemetry.javaagent.shaded.io.opentelemetry.context"
-
-  // relocate the OpenTelemetry extensions that are used by instrumentation modules
-  // these extensions live in the AgentClassLoader, and are injected into the user's class loader
-  // by the instrumentation modules that use them
-  relocate "io.opentelemetry.extension.aws", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.aws"
-  relocate "io.opentelemetry.extension.kotlin", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.kotlin"
-
-  // this is for instrumentation on opentelemetry-api itself
-  relocate "application.io.opentelemetry", "io.opentelemetry"
 }
 
 evaluationDependsOn(":testing:agent-for-testing")

instrumentation/instrumentation.gradle

@@ -1,6 +1,6 @@
 // this project will run in isolation under the agent's classloader
 plugins {
-  id "com.github.johnrengelman.shadow"
+  id "otel.shadow-conventions"
 }
 apply from: "$rootDir/gradle/java.gradle"
 
@@ -36,13 +36,6 @@ configurations {
 }
 
 shadowJar {
-  mergeServiceFiles()
-
-  exclude '**/module-info.class'
-
-  // Prevents conflict with other SLF4J instances. Important for premain.
-  relocate 'org.slf4j', 'io.opentelemetry.javaagent.slf4j'
-
   duplicatesStrategy = DuplicatesStrategy.FAIL
 
   dependencies {
@@ -51,26 +44,6 @@ shadowJar {
     exclude(project(':instrumentation-api'))
     exclude(project(':javaagent-api'))
   }
-
-  // rewrite library instrumentation dependencies
-  relocate "io.opentelemetry.instrumentation", "io.opentelemetry.javaagent.shaded.instrumentation"
-
-  // rewrite dependencies calling Logger.getLogger
-  relocate 'java.util.logging.Logger', 'io.opentelemetry.javaagent.bootstrap.PatchLogger'
-
-  // relocate OpenTelemetry API usage
-  relocate "io.opentelemetry.api", "io.opentelemetry.javaagent.shaded.io.opentelemetry.api"
-  relocate "io.opentelemetry.semconv", "io.opentelemetry.javaagent.shaded.io.opentelemetry.semconv"
-  relocate "io.opentelemetry.context", "io.opentelemetry.javaagent.shaded.io.opentelemetry.context"
-
-  // relocate the OpenTelemetry extensions that are used by instrumentation modules
-  // these extensions live in the AgentClassLoader, and are injected into the user's class loader
-  // by the instrumentation modules that use them
-  relocate "io.opentelemetry.extension.aws", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.aws"
-  relocate "io.opentelemetry.extension.kotlin", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.kotlin"
-
-  // this is for instrumentation on opentelemetry-api itself
-  relocate "application.io.opentelemetry", "io.opentelemetry"
 }
 
 tasks.register("listInstrumentations") {

javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/muzzle/collector/MuzzleCodeGenerator.java

@@ -14,6 +14,7 @@
 import io.opentelemetry.javaagent.extension.muzzle.MethodRef;
 import io.opentelemetry.javaagent.extension.muzzle.Source;
 import io.opentelemetry.javaagent.tooling.Utils;
+import java.net.URLClassLoader;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -158,7 +159,14 @@ private ReferenceCollector collectReferences() {
         typeInstrumentation.transform(adviceClassNameCollector);
       }
 
-      ReferenceCollector collector = new ReferenceCollector(instrumentationModule::isHelperClass);
+      // the classloader has a parent including the Gradle classpath, such as buildSrc dependencies.
+      // These may have resources take precedence over ones we define, so we need to make sure to
+      // not include them when loading resources.
+      ClassLoader resourceLoader =
+          new URLClassLoader(
+              ((URLClassLoader) MuzzleCodeGenerator.class.getClassLoader()).getURLs(), null);
+      ReferenceCollector collector =
+          new ReferenceCollector(instrumentationModule::isHelperClass, resourceLoader);
       for (String adviceClass : adviceClassNameCollector.getAdviceClassNames()) {
         collector.collectReferencesFromAdvice(adviceClass);
       }

javaagent-tooling/src/main/java/io/opentelemetry/javaagent/tooling/muzzle/collector/ReferenceCollector.java

@@ -48,15 +48,24 @@
  * plugin.
  */
 public class ReferenceCollector {
+
   private final Map<String, ClassRef> references = new LinkedHashMap<>();
   private final MutableGraph<String> helperSuperClassGraph = GraphBuilder.directed().build();
   private final Map<String, String> contextStoreClasses = new LinkedHashMap<>();
   private final Set<String> visitedClasses = new HashSet<>();
   private final InstrumentationClassPredicate instrumentationClassPredicate;
+  private final ClassLoader resourceLoader;
 
+  // only used by tests
   public ReferenceCollector(Predicate<String> libraryInstrumentationPredicate) {
+    this(libraryInstrumentationPredicate, ReferenceCollector.class.getClassLoader());
+  }
+
+  public ReferenceCollector(
+      Predicate<String> libraryInstrumentationPredicate, ClassLoader resourceLoader) {
     this.instrumentationClassPredicate =
         new InstrumentationClassPredicate(libraryInstrumentationPredicate);
+    this.resourceLoader = resourceLoader;
   }
 
   /**
@@ -158,16 +167,13 @@ private void visitClassesAndCollectReferences(
     }
   }
 
-  private static InputStream getClassFileStream(String className) throws IOException {
+  private InputStream getClassFileStream(String className) throws IOException {
     return getResourceStream(Utils.getResourceName(className));
   }
 
-  private static InputStream getResourceStream(String resource) throws IOException {
+  private InputStream getResourceStream(String resource) throws IOException {
     URLConnection connection =
-        checkNotNull(
-                ReferenceCollector.class.getClassLoader().getResource(resource),
-                "Couldn't find resource %s",
-                resource)
+        checkNotNull(resourceLoader.getResource(resource), "Couldn't find resource %s", resource)
             .openConnection();
 
     // Since the JarFile cache is not per class loader, but global with path as key, using cache may

javaagent/javaagent.gradle

@@ -3,7 +3,7 @@ import com.github.jk1.license.filter.LicenseBundleNormalizer
 import com.github.jk1.license.render.InventoryMarkdownReportRenderer
 
 plugins {
-  id "com.github.johnrengelman.shadow"
+  id "otel.shadow-conventions"
   id "com.github.jk1.dependency-license-report" version "1.16"
 }
 
@@ -60,8 +60,6 @@ shadowJar {
 
 //Includes instrumentations, but not exporters
 task lightShadow(type: ShadowJar) {
-  from sourceSets.main.output
-
   dependsOn ':instrumentation:shadowJar'
   def projectsWithShadowJar = [project(':instrumentation')]
   with isolateSpec(projectsWithShadowJar)
@@ -77,32 +75,10 @@ publishing {
 
 tasks.withType(ShadowJar).configureEach {
   configurations = [project.configurations.shadowInclude]
-  mergeServiceFiles()
 
   manifest {
     inheritFrom project.tasks.jar.manifest
   }
-
-  exclude '**/module-info.class'
-
-  // Prevents conflict with other SLF4J instances. Important for premain.
-  relocate 'org.slf4j', 'io.opentelemetry.javaagent.slf4j'
-  // rewrite dependencies calling Logger.getLogger
-  relocate 'java.util.logging.Logger', 'io.opentelemetry.javaagent.bootstrap.PatchLogger'
-
-  // prevents conflict with library instrumentation
-  relocate 'io.opentelemetry.instrumentation.api', 'io.opentelemetry.javaagent.shaded.instrumentation.api'
-
-  // relocate OpenTelemetry API
-  relocate "io.opentelemetry.api", "io.opentelemetry.javaagent.shaded.io.opentelemetry.api"
-  relocate "io.opentelemetry.semconv", "io.opentelemetry.javaagent.shaded.io.opentelemetry.semconv"
-  relocate "io.opentelemetry.context", "io.opentelemetry.javaagent.shaded.io.opentelemetry.context"
-
-  // relocate the OpenTelemetry extensions that are used by instrumentation modules
-  // these extensions live in the AgentClassLoader, and are injected into the user's class loader
-  // by the instrumentation modules that use them
-  relocate "io.opentelemetry.extension.aws", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.aws"
-  relocate "io.opentelemetry.extension.kotlin", "io.opentelemetry.javaagent.shaded.io.opentelemetry.extension.kotlin"
 }
 
 configurations {

settings.gradle

@@ -2,7 +2,6 @@ pluginManagement {
   plugins {
     id "com.diffplug.spotless" version "5.12.4"
     id 'com.github.ben-manes.versions' version '0.27.0'
-    id "com.github.johnrengelman.shadow" version "6.1.0"
     id "io.github.gradle-nexus.publish-plugin" version "1.0.0"
     id "me.champeau.jmh" version "0.6.4"
     id "net.ltgt.errorprone" version "1.3.0"