diff --git a/dd-trace-core/src/test/groovy/datadog/trace/common/writer/OtlpWriterCombinedTest.groovy b/dd-trace-core/src/test/groovy/datadog/trace/common/writer/OtlpWriterCombinedTest.groovy
deleted file mode 100644
index 0709f2b285a..00000000000
--- a/dd-trace-core/src/test/groovy/datadog/trace/common/writer/OtlpWriterCombinedTest.groovy
+++ /dev/null
@@ -1,44 +0,0 @@
-package datadog.trace.common.writer
-
-import static datadog.trace.agent.test.server.http.TestHttpServer.httpServer
-import static datadog.trace.api.config.OtlpConfig.TRACE_OTEL_EXPORTER
-
-import datadog.trace.core.test.DDCoreSpecification
-import java.util.concurrent.CountDownLatch
-import java.util.concurrent.TimeUnit
-import spock.lang.Timeout
-
-@Timeout(10)
-class OtlpWriterCombinedTest extends DDCoreSpecification {
-
-  def "happy path over HTTP"() {
-    setup:
-    injectSysConfig(TRACE_OTEL_EXPORTER, "otlp")
-
-    def received = new CountDownLatch(1)
-    def server = httpServer {
-      handlers {
-        post("/v1/traces") {
-          received.countDown()
-          response.status(200).send()
-        }
-      }
-    }
-    def writer = OtlpWriter.builder()
-      .endpoint(server.address.toString() + "/v1/traces")
-      .flushIntervalMilliseconds(-1)
-      .build()
-    def tracer = tracerBuilder().writer(writer).build()
-
-    when:
-    tracer.buildSpan("fakeOperation").start().finish()
-    writer.flush()
-
-    then:
-    received.await(5, TimeUnit.SECONDS)
-
-    cleanup:
-    tracer.close()
-    server.close()
-  }
-}
diff --git a/dd-trace-core/src/test/java/datadog/trace/common/writer/OtlpWriterCombinedTest.java b/dd-trace-core/src/test/java/datadog/trace/common/writer/OtlpWriterCombinedTest.java
new file mode 100644
index 00000000000..b00b424427f
--- /dev/null
+++ b/dd-trace-core/src/test/java/datadog/trace/common/writer/OtlpWriterCombinedTest.java
@@ -0,0 +1,56 @@
+package datadog.trace.common.writer;
+
+import static datadog.trace.api.config.OtlpConfig.TRACE_OTEL_EXPORTER;
+import static datadog.trace.junit.utils.config.WithConfigExtension.injectSysConfig;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import com.sun.net.httpserver.HttpServer;
+import datadog.trace.core.CoreTracer;
+import datadog.trace.core.DDCoreJavaSpecification;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+@Timeout(value = 10, unit = TimeUnit.SECONDS)
+class OtlpWriterCombinedTest extends DDCoreJavaSpecification {
+
+  @Test
+  void happyPathOverHttp() throws IOException, InterruptedException {
+    injectSysConfig(TRACE_OTEL_EXPORTER, "otlp");
+
+    CountDownLatch received = new CountDownLatch(1);
+    HttpServer server = HttpServer.create(new InetSocketAddress("localhost", 0), 0);
+    server.createContext(
+        "/v1/traces",
+        exchange -> {
+          received.countDown();
+          exchange.sendResponseHeaders(200, -1);
+          exchange.close();
+        });
+    server.start();
+
+    OtlpWriter writer =
+        OtlpWriter.builder()
+            .endpoint(
+                "http://"
+                    + server.getAddress().getHostString()
+                    + ":"
+                    + server.getAddress().getPort()
+                    + "/v1/traces")
+            .flushIntervalMilliseconds(-1)
+            .build();
+    CoreTracer tracer = tracerBuilder().writer(writer).build();
+    try {
+      tracer.buildSpan("test", "fakeOperation").start().finish();
+      writer.flush();
+
+      assertTrue(received.await(5, TimeUnit.SECONDS), "OTLP server should receive a request");
+    } finally {
+      tracer.close();
+      server.stop(0);
+    }
+  }
+}