Auto-configure ReactiveStringRedisTemplate if necessary

See gh-16604

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/redis/RedisReactiveAutoConfiguration.java

@@ -28,6 +28,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.data.redis.connection.ReactiveRedisConnectionFactory;
 import org.springframework.data.redis.core.ReactiveRedisTemplate;
+import org.springframework.data.redis.core.ReactiveStringRedisTemplate;
 import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
 import org.springframework.data.redis.serializer.RedisSerializationContext;
 
@@ -60,4 +61,12 @@ public class RedisReactiveAutoConfiguration {
 				serializationContext);
 	}
 
+	@Bean
+	@ConditionalOnMissingBean(name = "reactiveStringRedisTemplate")
+	@ConditionalOnBean(ReactiveRedisConnectionFactory.class)
+	public ReactiveStringRedisTemplate reactiveStringRedisTemplate(
+			ReactiveRedisConnectionFactory reactiveRedisConnectionFactory) {
+		return new ReactiveStringRedisTemplate(reactiveRedisConnectionFactory);
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/redis/RedisReactiveAutoConfigurationTests.java

@@ -41,7 +41,8 @@ public class RedisReactiveAutoConfigurationTests {
 	public void testDefaultRedisConfiguration() {
 		this.contextRunner.run((context) -> {
 			Map<String, ?> beans = context.getBeansOfType(ReactiveRedisTemplate.class);
-			assertThat(beans).containsOnlyKeys("reactiveRedisTemplate");
+			assertThat(beans).containsOnlyKeys("reactiveRedisTemplate",
+					"reactiveStringRedisTemplate");
 		});
 	}