From 54be51f488b5d68f960f540c3a97bee88559f329 Mon Sep 17 00:00:00 2001
From: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Date: Tue, 7 Oct 2025 18:28:09 +0200
Subject: [PATCH] convert to java

---
 .../javaagent-tooling-java9/build.gradle.kts  |  8 +++++
 .../javaagent/tooling/UnsafeInitializer.java  |  3 +-
 .../src/test/groovy/UnsafeTest.groovy         | 23 -------------
 .../javaagent/tooling/UnsafeTest.java         | 32 +++++++++++++++++++
 4 files changed, 42 insertions(+), 24 deletions(-)
 delete mode 100644 javaagent-tooling/javaagent-tooling-java9/src/test/groovy/UnsafeTest.groovy
 create mode 100644 javaagent-tooling/javaagent-tooling-java9/src/test/java/io/opentelemetry/javaagent/tooling/UnsafeTest.java

diff --git a/javaagent-tooling/javaagent-tooling-java9/build.gradle.kts b/javaagent-tooling/javaagent-tooling-java9/build.gradle.kts
index d1a54f2e7e7f..47984f346e61 100644
--- a/javaagent-tooling/javaagent-tooling-java9/build.gradle.kts
+++ b/javaagent-tooling/javaagent-tooling-java9/build.gradle.kts
@@ -29,4 +29,12 @@ tasks {
       compilerArgs.add("-Xlint:none")
     }
   }
+  compileTestJava {
+    with(options) {
+      // Because this module targets Java 9, we trigger this compiler bug which was fixed but not
+      // backported to Java 9 compilation.
+      // https://bugs.openjdk.java.net/browse/JDK-8209058
+      compilerArgs.add("-Xlint:none")
+    }
+  }
 }
diff --git a/javaagent-tooling/javaagent-tooling-java9/src/main/java/io/opentelemetry/javaagent/tooling/UnsafeInitializer.java b/javaagent-tooling/javaagent-tooling-java9/src/main/java/io/opentelemetry/javaagent/tooling/UnsafeInitializer.java
index 7f81277f154d..69a9a76a2d79 100644
--- a/javaagent-tooling/javaagent-tooling-java9/src/main/java/io/opentelemetry/javaagent/tooling/UnsafeInitializer.java
+++ b/javaagent-tooling/javaagent-tooling-java9/src/main/java/io/opentelemetry/javaagent/tooling/UnsafeInitializer.java
@@ -22,7 +22,8 @@ static void initialize(Instrumentation instrumentation, ClassLoader classLoader)
     initialize(instrumentation, classLoader, true);
   }
 
-  private static void initialize(
+  // visible for testing
+  static void initialize(
       Instrumentation instrumentation, ClassLoader classLoader, boolean testUnsafePresent) {
     Class<?> unsafeClass;
     try {
diff --git a/javaagent-tooling/javaagent-tooling-java9/src/test/groovy/UnsafeTest.groovy b/javaagent-tooling/javaagent-tooling-java9/src/test/groovy/UnsafeTest.groovy
deleted file mode 100644
index 671be3c55d5c..000000000000
--- a/javaagent-tooling/javaagent-tooling-java9/src/test/groovy/UnsafeTest.groovy
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Copyright The OpenTelemetry Authors
- * SPDX-License-Identifier: Apache-2.0
- */
-
-import io.opentelemetry.javaagent.bootstrap.AgentClassLoader
-import io.opentelemetry.javaagent.tooling.UnsafeInitializer
-import net.bytebuddy.agent.ByteBuddyAgent
-import spock.lang.Specification
-
-class UnsafeTest extends Specification {
-
-  def "test generate sun.misc.Unsafe"() {
-    setup:
-    ByteBuddyAgent.install()
-    URL testJarLocation = AgentClassLoader.getProtectionDomain().getCodeSource().getLocation()
-    AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()))
-    UnsafeInitializer.initialize(ByteBuddyAgent.getInstrumentation(), loader, false)
-
-    expect:
-    loader.loadClass("sun.misc.Unsafe").getClassLoader() == loader
-  }
-}
diff --git a/javaagent-tooling/javaagent-tooling-java9/src/test/java/io/opentelemetry/javaagent/tooling/UnsafeTest.java b/javaagent-tooling/javaagent-tooling-java9/src/test/java/io/opentelemetry/javaagent/tooling/UnsafeTest.java
new file mode 100644
index 000000000000..373fc6e59615
--- /dev/null
+++ b/javaagent-tooling/javaagent-tooling-java9/src/test/java/io/opentelemetry/javaagent/tooling/UnsafeTest.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent.tooling;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.javaagent.bootstrap.AgentClassLoader;
+import java.io.File;
+import java.net.URL;
+import net.bytebuddy.agent.ByteBuddyAgent;
+import org.junit.jupiter.api.Test;
+
+class UnsafeTest {
+
+  @Test
+  void testGenerateSunMiscUnsafe() throws Exception {
+    ByteBuddyAgent.install();
+    URL testJarLocation =
+        AgentClassLoader.class.getProtectionDomain().getCodeSource().getLocation();
+
+    try (AgentClassLoader loader = new AgentClassLoader(new File(testJarLocation.toURI()))) {
+      UnsafeInitializer.initialize(ByteBuddyAgent.getInstrumentation(), loader, false);
+
+      Class<?> unsafeClass = loader.loadClass("sun.misc.Unsafe");
+
+      assertThat(unsafeClass.getClassLoader()).isEqualTo(loader);
+    }
+  }
+}