Allow DevTools to find and configure Spring Session 1.1's RedisTemplate

Previously, when Spring Session 1.1.0.M1 and DevTools were declared as
dependencies the application failed to start, because
sessionRedisTemplate could not be resolved.

This commit relaxes the dependency for sessionRedisTemplate in
restartCompatibleRedisSerializerConfigurer from
RedisTemplate<String, ExpiringSession> to RedisTemplate<?, ?> and uses
the bean name in a @Qualifer to ensure that the right RedisTemplate
bean gets injected.

Fixes spring-projectsgh-4895
Closes spring-projectsgh-4896

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/LocalDevToolsAutoConfiguration.java

@@ -21,6 +21,7 @@
 import java.util.List;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -42,7 +43,6 @@
 import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.context.event.EventListener;
 import org.springframework.data.redis.core.RedisTemplate;
-import org.springframework.session.ExpiringSession;
 import org.springframework.util.StringUtils;
 
 /**
@@ -169,7 +169,7 @@ static class RedisRestartConfiguration {
 
 			@Bean
 			public RestartCompatibleRedisSerializerConfigurer restartCompatibleRedisSerializerConfigurer(
-					RedisTemplate<String, ExpiringSession> sessionRedisTemplate) {
+					@Qualifier("sessionRedisTemplate") RedisTemplate<?, ?> sessionRedisTemplate) {
 				return new RestartCompatibleRedisSerializerConfigurer(
 						sessionRedisTemplate);
 			}

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/RestartCompatibleRedisSerializerConfigurer.java

@@ -26,7 +26,6 @@
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.data.redis.serializer.RedisSerializer;
 import org.springframework.data.redis.serializer.SerializationException;
-import org.springframework.session.ExpiringSession;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -42,12 +41,11 @@
  */
 class RestartCompatibleRedisSerializerConfigurer implements BeanClassLoaderAware {
 
-	private final RedisTemplate<String, ExpiringSession> redisTemplate;
+	private final RedisTemplate<?, ?> redisTemplate;
 
 	private volatile ClassLoader classLoader;
 
-	RestartCompatibleRedisSerializerConfigurer(
-			RedisTemplate<String, ExpiringSession> redisTemplate) {
+	RestartCompatibleRedisSerializerConfigurer(RedisTemplate<?, ?> redisTemplate) {
 		this.redisTemplate = redisTemplate;
 	}
 

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/LocalDevToolsAutoConfigurationTests.java

@@ -241,13 +241,27 @@ public void watchingAdditionalPaths() throws Exception {
 	}
 
 	@Test
-	public void sessionRedisTemplateIsConfiguredWithCustomDeserializers()
+	public void sessionRedisTemplateIsConfiguredWithCustomDeserializers10()
 			throws Exception {
-		SpringApplication application = new SpringApplication(
-				SessionRedisTemplateConfig.class, LocalDevToolsAutoConfiguration.class);
+		sessionRedisTemplateIsConfiguredWithCustomDeserializers(
+				SessionRedisTemplateConfig10.class);
+	}
+
+	@Test
+	public void sessionRedisTemplateIsConfiguredWithCustomDeserializers11()
+			throws Exception {
+		sessionRedisTemplateIsConfiguredWithCustomDeserializers(
+				SessionRedisTemplateConfig11.class);
+	}
+
+	private void sessionRedisTemplateIsConfiguredWithCustomDeserializers(
+			Object sessionConfig) throws Exception {
+		SpringApplication application = new SpringApplication(sessionConfig,
+				LocalDevToolsAutoConfiguration.class);
 		application.setWebEnvironment(false);
 		this.context = application.run();
-		RedisTemplate<?, ?> redisTemplate = this.context.getBean(RedisTemplate.class);
+		RedisTemplate<?, ?> redisTemplate = this.context.getBean("sessionRedisTemplate",
+				RedisTemplate.class);
 		assertThat(redisTemplate.getHashKeySerializer(),
 				is(instanceOf(RestartCompatibleRedisSerializer.class)));
 		assertThat(redisTemplate.getHashValueSerializer(),
@@ -306,15 +320,24 @@ public static class WebResourcesConfig {
 	}
 
 	@Configuration
-	public static class SessionRedisTemplateConfig {
+	public static class SessionRedisTemplateConfig10 {
 
 		@Bean
 		public RedisTemplate<String, ExpiringSession> sessionRedisTemplate() {
 			RedisTemplate<String, ExpiringSession> redisTemplate = new RedisTemplate<String, ExpiringSession>();
 			redisTemplate.setConnectionFactory(mock(RedisConnectionFactory.class));
 			return redisTemplate;
 		}
-
 	}
 
+	@Configuration
+	public static class SessionRedisTemplateConfig11 {
+
+		@Bean
+		public RedisTemplate<Object, Object> sessionRedisTemplate() {
+			RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<Object, Object>();
+			redisTemplate.setConnectionFactory(mock(RedisConnectionFactory.class));
+			return redisTemplate;
+		}
+	}
 }