Do not run BlockingLoadBalancerClientAutoConfiguration or LoadBalancerCacheAutoConfiguration when load-balancing disabled. Fixes gh-1114.

spring-cloud-loadbalancer/src/main/java/org/springframework/cloud/loadbalancer/config/BlockingLoadBalancerClientAutoConfiguration.java

@@ -21,6 +21,7 @@ import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.client.ServiceInstance;
 import org.springframework.cloud.client.loadbalancer.AsyncLoadBalancerAutoConfiguration;
@@ -52,6 +53,7 @@ import org.springframework.web.client.RestTemplate;
 @AutoConfigureBefore({ org.springframework.cloud.client.loadbalancer.LoadBalancerAutoConfiguration.class,
 		AsyncLoadBalancerAutoConfiguration.class })
 @ConditionalOnClass(RestTemplate.class)
+@ConditionalOnProperty(value = "spring.cloud.loadbalancer.enabled", havingValue = "true", matchIfMissing = true)
 public class BlockingLoadBalancerClientAutoConfiguration {
 
 	@Bean

spring-cloud-loadbalancer/src/main/java/org/springframework/cloud/loadbalancer/config/LoadBalancerCacheAutoConfiguration.java

@@ -25,6 +25,7 @@ import org.apache.commons.logging.LogFactory;
 
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.AllNestedConditions;
 import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -43,9 +44,9 @@ import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 
 /**
- * An AutoConfiguration that automatically enables caching when when Spring Boot, and
- * Spring Framework Cache support are present. If Caffeine is present in the classpath, it
- * will be used for loadbalancer caching. If not, a default cache will be used.
+ * An AutoConfiguration that automatically enables caching when Spring Boot, and Spring
+ * Framework Cache support are present. If Caffeine is present in the classpath, it will
+ * be used for loadbalancer caching. If not, a default cache will be used.
  *
  * @author Olga Maciaszek-Sharma
  * @since 2.2.0
@@ -57,8 +58,8 @@ import org.springframework.context.annotation.Configuration;
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnClass({ CacheManager.class, CacheAutoConfiguration.class })
 @AutoConfigureAfter(CacheAutoConfiguration.class)
-@ConditionalOnProperty(value = "spring.cloud.loadbalancer.cache.enabled", matchIfMissing = true)
 @EnableConfigurationProperties(LoadBalancerCacheProperties.class)
+@Conditional(LoadBalancerCacheAutoConfiguration.OnLoadBalancerCachingEnabledCondition.class)
 public class LoadBalancerCacheAutoConfiguration {
 
 	@Configuration(proxyBeanMethods = false)
@@ -130,4 +131,22 @@ public class LoadBalancerCacheAutoConfiguration {
 
 	}
 
+	static final class OnLoadBalancerCachingEnabledCondition extends AllNestedConditions {
+
+		OnLoadBalancerCachingEnabledCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnProperty(value = "spring.cloud.loadbalancer.enabled", havingValue = "true", matchIfMissing = true)
+		static class LoadBalancerEnabled {
+
+		}
+
+		@ConditionalOnProperty(value = "spring.cloud.loadbalancer.cache.enabled", matchIfMissing = true)
+		static class LoadBalancerCacheEnabled {
+
+		}
+
+	}
+
 }

spring-cloud-loadbalancer/src/test/java/org/springframework/cloud/loadbalancer/config/BlockingLoadBalancerClientAutoConfigurationTests.java

@@ -53,4 +53,12 @@ class BlockingLoadBalancerClientAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void shouldNotFailOnRetryFactoryWhenLoadBalancingDisabled() {
+		applicationContextRunner.withPropertyValues("spring.cloud.loadbalancer.enabled=false").run(context -> {
+			assertThat(context).doesNotHaveBean(BlockingLoadBalancerClient.class);
+			assertThat(context).doesNotHaveBean(LoadBalancedRetryFactory.class);
+		});
+	}
+
 }

spring-cloud-loadbalancer/src/test/java/org/springframework/cloud/loadbalancer/config/LoadBalancerCacheAutoConfigurationTests.java

@@ -171,6 +171,16 @@ class LoadBalancerCacheAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void shouldNotInstantiateDefaultLoadBalancerCacheIfLoadBalancingDisabled() {
+		noCaffeineRunner().withPropertyValues("spring.cloud.loadbalancer.enabled=false")
+				.withUserConfiguration(TestConfiguration.class).run(context -> {
+					assertThat(context.getBeansOfType(CacheManager.class)).hasSize(1);
+					assertThat(context.getBean("cacheManager")).isInstanceOf(ConcurrentMapCacheManager.class);
+					assertThat(((CacheManager) context.getBean("cacheManager")).getCacheNames()).isEmpty();
+				});
+	}
+
 	private ApplicationContextRunner baseApplicationRunner() {
 		return new ApplicationContextRunner().withConfiguration(
 				AutoConfigurations.of(CacheAutoConfiguration.class, LoadBalancerCacheAutoConfiguration.class));