Added test for OtlpGrpcSpanExporterProvider

Signed-off-by: Shephali Mittal <shephalm@amazon.com>

plugins/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/exporter/OTelSpanExporterFactory.java

@@ -16,6 +16,7 @@
 
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
 import java.security.AccessController;
 import java.security.PrivilegedActionException;
 import java.security.PrivilegedExceptionAction;
@@ -55,16 +56,16 @@ private static SpanExporter instantiateSpanExporter(Class<SpanExporter> spanExpo
             // Check we ourselves are not being called by unprivileged code.
             SpecialPermission.check();
             return AccessController.doPrivileged((PrivilegedExceptionAction<SpanExporter>) () -> {
-                try {
-                    String methodName = "create";
-                    boolean createMethodWithSettingsParamExists = true;
-                    try {
-                        // Attempt to get the method with the specified name and parameter types
-                        spanExporterProviderClass.getMethod(methodName, Settings.class);
-                    } catch (NoSuchMethodException e) {
-                        createMethodWithSettingsParamExists = false;
+                String methodName = "create";
+                boolean isCreateMethodContainsSettingsParam = false;
+                for (Method m : spanExporterProviderClass.getMethods()) {
+                    if (m.getName().equals(methodName) && m.getParameterCount() == 1 && m.getParameterTypes()[0] == Settings.class) {
+                        isCreateMethodContainsSettingsParam = true;
+                        break;
                     }
-                    if (createMethodWithSettingsParamExists) {
+                }
+                try {
+                    if (isCreateMethodContainsSettingsParam) {
                         return (SpanExporter) MethodHandles.publicLookup()
                             .findStatic(
                                 spanExporterProviderClass,
@@ -79,7 +80,6 @@ private static SpanExporter instantiateSpanExporter(Class<SpanExporter> spanExpo
                             .asType(MethodType.methodType(SpanExporter.class))
                             .invokeExact();
                     }
-
                 } catch (Throwable e) {
                     if (e.getCause() instanceof NoSuchMethodException) {
                         throw new IllegalStateException("No create factory method exist in [" + spanExporterProviderClass.getName() + "]");

plugins/telemetry-otel/src/test/java/org/opensearch/telemetry/tracing/exporter/OtlpGrpcSpanExporterProviderTests.java

@@ -0,0 +1,26 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.telemetry.tracing.exporter;
+
+import org.opensearch.common.settings.Settings;
+import org.opensearch.telemetry.OTelTelemetrySettings;
+import org.opensearch.test.OpenSearchTestCase;
+
+public class OtlpGrpcSpanExporterProviderTests extends OpenSearchTestCase {
+    public void testSpanExporterInstantiatedProperly() {
+        Settings settings = Settings.builder()
+            .put(
+                OTelTelemetrySettings.OTEL_TRACER_SPAN_EXPORTER_CLASS_SETTING.getKey(),
+                "org.opensearch.telemetry.tracing.exporter.OtlpGrpcSpanExporterProvider"
+            )
+            .build();
+
+        assertTrue(OTelSpanExporterFactory.create(settings) instanceof OtlpGrpcSpanExporterProvider);
+    }
+}