Convert internal-class-loader tests from groovy to java

instrumentation/internal/internal-class-loader/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/internal/classloader/ClassLoadingTest.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.instrumentation.internal.classloader;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+import org.junit.jupiter.api.Test;
+
+class ClassLoadingTest {
+
+  @Test
+  void testDelegatesToBootstrapClassLoaderForAgentClasses() throws ClassNotFoundException {
+    NonDelegatingUrlClassLoader classLoader = new NonDelegatingUrlClassLoader();
+    Class<?> clazz =
+        Class.forName(
+            "io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge", false, classLoader);
+
+    assertThat(clazz).isNotNull();
+    assertThat(clazz.getClassLoader()).isNull();
+  }
+
+  @Test
+  void testDelegatesToBootstrapClassLoaderForAgentClassesTwoArguments()
+      throws ClassNotFoundException {
+    NonDelegatingUrlClassLoader classLoader = new NonDelegatingUrlClassLoader();
+    Class<?> clazz =
+        classLoader.loadClass("io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge", false);
+    assertThat(clazz).isNotNull();
+    assertThat(clazz.getClassLoader()).isNull();
+  }
+
+  static class NonDelegatingUrlClassLoader extends URLClassLoader {
+
+    NonDelegatingUrlClassLoader() {
+      super(new URL[0]);
+    }
+
+    @Override
+    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+      synchronized (getClassLoadingLock(name)) {
+        Class<?> clazz = findLoadedClass(name);
+        if (clazz == null) {
+          clazz = findClass(name);
+        }
+        if (resolve) {
+          resolveClass(clazz);
+        }
+        return clazz;
+      }
+    }
+  }
+}

instrumentation/internal/internal-class-loader/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/internal/classloader/JbossClassloadingTest.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.instrumentation.internal.classloader;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.instrumentation.testing.junit.AgentInstrumentationExtension;
+import io.opentelemetry.instrumentation.testing.junit.InstrumentationExtension;
+import org.jboss.modules.Module;
+import org.jboss.modules.ModuleClassLoader;
+import org.jboss.modules.ModuleFinder;
+import org.jboss.modules.ModuleIdentifier;
+import org.jboss.modules.ModuleLoadException;
+import org.jboss.modules.ModuleLoader;
+import org.jboss.modules.ModuleSpec;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+class JbossClassloadingTest {
+
+  @RegisterExtension
+  static final InstrumentationExtension testing = AgentInstrumentationExtension.create();
+
+  @Test
+  void testDelegatesToBootstrapClassLoaderForAgentClasses()
+      throws ModuleLoadException, ClassNotFoundException {
+    ModuleFinder[] moduleFinders = new ModuleFinder[1];
+    moduleFinders[0] = (identifier, delegateLoader) -> ModuleSpec.build(identifier).create();
+
+    ModuleLoader moduleLoader = new ModuleLoader(moduleFinders);
+    ModuleIdentifier moduleId = ModuleIdentifier.fromString("test");
+    Module testModule = moduleLoader.loadModule(moduleId);
+    ModuleClassLoader classLoader = testModule.getClassLoader();
+
+    Class<?> clazz =
+        Class.forName(
+            "io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge", false, classLoader);
+
+    assertThat(clazz).isNotNull();
+    assertThat(clazz.getClassLoader()).isNull();
+  }
+}