Correctly handle getTargetClass method for observation proxies.

Closes #1426

spring-data-cassandra/src/main/java/org/springframework/data/cassandra/observability/CqlSessionObservationInterceptor.java

@@ -66,6 +66,10 @@ public Object invoke(MethodInvocation invocation) throws Throwable {
 		Method method = invocation.getMethod();
 		Object[] args = invocation.getArguments();
 
+		if (method.getName().equals("getTargetClass")) {
+			return delegate.getClass();
+		}
+
 		if (method.getName().equals("execute") && args.length > 0) {
 			return observe(createStatement(args), method.getName(), this.delegate::execute);
 		}

spring-data-cassandra/src/main/java/org/springframework/data/cassandra/observability/ObservationStatement.java

@@ -17,6 +17,8 @@
 
 import io.micrometer.observation.Observation;
 
+import java.lang.reflect.Method;
+
 import javax.annotation.Nonnull;
 
 import org.aopalliance.intercept.MethodInterceptor;
@@ -77,7 +79,13 @@ public static boolean isObservationStatement(Statement<?> statement) {
 	@Override
 	public Object invoke(@Nonnull MethodInvocation invocation) throws Throwable {
 
-		if (invocation.getMethod().getName().equals("getObservation")) {
+		Method method = invocation.getMethod();
+
+		if (method.getName().equals("getTargetClass")) {
+			return this.delegate.getClass();
+		}
+
+		if (method.getName().equals("getObservation")) {
 			return this.observation;
 		}
 

spring-data-cassandra/src/test/java/org/springframework/data/cassandra/observability/ObservableCqlSessionFactoryUnitTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.cassandra.observability;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import io.micrometer.observation.ObservationRegistry;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.aop.framework.AopProxyUtils;
+import org.springframework.aop.support.AopUtils;
+
+import com.datastax.oss.driver.api.core.CqlSession;
+
+/**
+ * Unit tests for {@link ObservableCqlSessionFactory}.
+ *
+ * @author Mark Paluch
+ */
+class ObservableCqlSessionFactoryUnitTests {
+
+	@Test // GH-1426
+	void sessionFactoryBeanUnwrapsObservationProxy() throws Exception {
+
+		CqlSession session = mock(CqlSession.class);
+		ObservationRegistry registry = ObservationRegistry.NOOP;
+
+		CqlSession object = ObservableCqlSessionFactory.wrap(session, registry);
+
+		assertThat(AopUtils.getTargetClass(object)).isEqualTo(session.getClass());
+		assertThat(AopProxyUtils.getSingletonTarget(object)).isEqualTo(session);
+	}
+
+}