Avoid using reflection when creating composite health contributors

Closes gh-32541

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/amqp/RabbitHealthContributorAutoConfiguration.java

@@ -44,6 +44,10 @@ import org.springframework.context.annotation.Bean;
 public class RabbitHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<RabbitHealthIndicator, RabbitTemplate> {
 
+	public RabbitHealthContributorAutoConfiguration() {
+		super(RabbitHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "rabbitHealthIndicator", "rabbitHealthContributor" })
 	public HealthContributor rabbitHealthContributor(Map<String, RabbitTemplate> rabbitTemplates) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cassandra/CassandraHealthContributorConfigurations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -43,6 +43,10 @@ class CassandraHealthContributorConfigurations {
 	static class CassandraDriverConfiguration
 			extends CompositeHealthContributorConfiguration<CassandraDriverHealthIndicator, CqlSession> {
 
+		CassandraDriverConfiguration() {
+			super(CassandraDriverHealthIndicator::new);
+		}
+
 		@Bean
 		@ConditionalOnMissingBean(name = { "cassandraHealthIndicator", "cassandraHealthContributor" })
 		HealthContributor cassandraHealthContributor(Map<String, CqlSession> sessions) {
@@ -56,6 +60,10 @@ class CassandraHealthContributorConfigurations {
 	static class CassandraReactiveDriverConfiguration extends
 			CompositeReactiveHealthContributorConfiguration<CassandraDriverReactiveHealthIndicator, CqlSession> {
 
+		CassandraReactiveDriverConfiguration() {
+			super(CassandraDriverReactiveHealthIndicator::new);
+		}
+
 		@Bean
 		@ConditionalOnMissingBean(name = { "cassandraHealthIndicator", "cassandraHealthContributor" })
 		ReactiveHealthContributor cassandraHealthContributor(Map<String, CqlSession> sessions) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/couchbase/CouchbaseHealthContributorAutoConfiguration.java

@@ -49,6 +49,10 @@ import org.springframework.context.annotation.Bean;
 public class CouchbaseHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<CouchbaseHealthIndicator, Cluster> {
 
+	public CouchbaseHealthContributorAutoConfiguration() {
+		super(CouchbaseHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "couchbaseHealthIndicator", "couchbaseHealthContributor" })
 	public HealthContributor couchbaseHealthContributor(Map<String, Cluster> clusters) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/couchbase/CouchbaseReactiveHealthContributorAutoConfiguration.java

@@ -48,6 +48,10 @@ import org.springframework.context.annotation.Bean;
 public class CouchbaseReactiveHealthContributorAutoConfiguration
 		extends CompositeReactiveHealthContributorConfiguration<CouchbaseReactiveHealthIndicator, Cluster> {
 
+	public CouchbaseReactiveHealthContributorAutoConfiguration() {
+		super(CouchbaseReactiveHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "couchbaseHealthIndicator", "couchbaseHealthContributor" })
 	public ReactiveHealthContributor couchbaseHealthContributor(Map<String, Cluster> clusters) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/data/elasticsearch/ElasticsearchReactiveHealthContributorAutoConfiguration.java

@@ -48,6 +48,10 @@ import org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchCl
 public class ElasticsearchReactiveHealthContributorAutoConfiguration extends
 		CompositeReactiveHealthContributorConfiguration<ElasticsearchReactiveHealthIndicator, ReactiveElasticsearchClient> {
 
+	public ElasticsearchReactiveHealthContributorAutoConfiguration() {
+		super(ElasticsearchReactiveHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
 	public ReactiveHealthContributor elasticsearchHealthContributor(Map<String, ReactiveElasticsearchClient> clients) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/data/mongo/MongoHealthContributorAutoConfiguration.java

@@ -46,6 +46,10 @@ import org.springframework.data.mongodb.core.MongoTemplate;
 public class MongoHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<MongoHealthIndicator, MongoTemplate> {
 
+	public MongoHealthContributorAutoConfiguration() {
+		super(MongoHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "mongoHealthIndicator", "mongoHealthContributor" })
 	public HealthContributor mongoHealthContributor(Map<String, MongoTemplate> mongoTemplates) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/data/mongo/MongoReactiveHealthContributorAutoConfiguration.java

@@ -47,6 +47,10 @@ import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
 public class MongoReactiveHealthContributorAutoConfiguration
 		extends CompositeReactiveHealthContributorConfiguration<MongoReactiveHealthIndicator, ReactiveMongoTemplate> {
 
+	public MongoReactiveHealthContributorAutoConfiguration() {
+		super(MongoReactiveHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "mongoHealthIndicator", "mongoHealthContributor" })
 	public ReactiveHealthContributor mongoHealthContributor(Map<String, ReactiveMongoTemplate> reactiveMongoTemplates) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/data/redis/RedisHealthContributorAutoConfiguration.java

@@ -47,6 +47,10 @@ import org.springframework.data.redis.connection.RedisConnectionFactory;
 public class RedisHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<RedisHealthIndicator, RedisConnectionFactory> {
 
+	RedisHealthContributorAutoConfiguration() {
+		super(RedisHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "redisHealthIndicator", "redisHealthContributor" })
 	public HealthContributor redisHealthContributor(Map<String, RedisConnectionFactory> redisConnectionFactories) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/data/redis/RedisReactiveHealthContributorAutoConfiguration.java

@@ -54,6 +54,7 @@ public class RedisReactiveHealthContributorAutoConfiguration extends
 
 	RedisReactiveHealthContributorAutoConfiguration(
 			Map<String, ReactiveRedisConnectionFactory> redisConnectionFactories) {
+		super(RedisReactiveHealthIndicator::new);
 		this.redisConnectionFactories = redisConnectionFactories;
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticsearchRestHealthContributorAutoConfiguration.java

@@ -46,6 +46,10 @@ import org.springframework.context.annotation.Bean;
 public class ElasticsearchRestHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<ElasticsearchRestClientHealthIndicator, RestClient> {
 
+	public ElasticsearchRestHealthContributorAutoConfiguration() {
+		super(ElasticsearchRestClientHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
 	public HealthContributor elasticsearchHealthContributor(Map<String, RestClient> clients) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/hazelcast/HazelcastHealthContributorAutoConfiguration.java

@@ -46,6 +46,10 @@ import org.springframework.context.annotation.Bean;
 public class HazelcastHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<HazelcastHealthIndicator, HazelcastInstance> {
 
+	public HazelcastHealthContributorAutoConfiguration() {
+		super(HazelcastHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "hazelcastHealthIndicator", "hazelcastHealthContributor" })
 	public HealthContributor hazelcastHealthContributor(Map<String, HazelcastInstance> hazelcastInstances) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/AbstractCompositeHealthContributorConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure.health;
 
 import java.lang.reflect.Constructor;
 import java.util.Map;
+import java.util.function.Function;
 
 import org.springframework.beans.BeanUtils;
 import org.springframework.core.ResolvableType;
@@ -36,16 +37,41 @@ import org.springframework.util.Assert;
  */
 public abstract class AbstractCompositeHealthContributorConfiguration<C, I extends C, B> {
 
-	private final Class<?> indicatorType;
+	private final Function<B, I> indicatorFactory;
 
-	private final Class<?> beanType;
-
-	AbstractCompositeHealthContributorConfiguration() {
+	/**
+	 * Creates a {@code AbstractCompositeHealthContributorConfiguration} that will use
+	 * reflection to create health indicator instances.
+	 * @deprecated since 3.0.0 in favor of
+	 * {@link #AbstractCompositeHealthContributorConfiguration(Function)}
+	 */
+	@Deprecated(since = "3.0.0", forRemoval = true)
+	protected AbstractCompositeHealthContributorConfiguration() {
 		ResolvableType type = ResolvableType.forClass(AbstractCompositeHealthContributorConfiguration.class,
 				getClass());
-		this.indicatorType = type.resolveGeneric(1);
-		this.beanType = type.resolveGeneric(2);
+		Class<?> indicatorType = type.resolveGeneric(1);
+		Class<?> beanType = type.resolveGeneric(2);
+		this.indicatorFactory = (bean) -> {
+			try {
+				@SuppressWarnings("unchecked")
+				Constructor<I> constructor = (Constructor<I>) indicatorType.getDeclaredConstructor(beanType);
+				return BeanUtils.instantiateClass(constructor, bean);
+			}
+			catch (Exception ex) {
+				throw new IllegalStateException(
+						"Unable to create health indicator " + indicatorType + " for bean type " + beanType, ex);
+			}
+		};
+	}
 
+	/**
+	 * Creates a {@code AbstractCompositeHealthContributorConfiguration} that will use the
+	 * given {@code indicatorFactory} to create health indicator instances.
+	 * @param indicatorFactory the function to create health indicators
+	 * @since 3.0.0
+	 */
+	protected AbstractCompositeHealthContributorConfiguration(Function<B, I> indicatorFactory) {
+		this.indicatorFactory = indicatorFactory;
 	}
 
 	protected final C createContributor(Map<String, B> beans) {
@@ -58,16 +84,8 @@ public abstract class AbstractCompositeHealthContributorConfiguration<C, I exten
 
 	protected abstract C createComposite(Map<String, B> beans);
 
-	@SuppressWarnings("unchecked")
 	protected I createIndicator(B bean) {
-		try {
-			Constructor<I> constructor = (Constructor<I>) this.indicatorType.getDeclaredConstructor(this.beanType);
-			return BeanUtils.instantiateClass(constructor, bean);
-		}
-		catch (Exception ex) {
-			throw new IllegalStateException(
-					"Unable to create health indicator " + this.indicatorType + " for bean type " + this.beanType, ex);
-		}
+		return this.indicatorFactory.apply(bean);
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/CompositeHealthContributorConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -17,6 +17,7 @@
 package org.springframework.boot.actuate.autoconfigure.health;
 
 import java.util.Map;
+import java.util.function.Function;
 
 import org.springframework.boot.actuate.health.CompositeHealthContributor;
 import org.springframework.boot.actuate.health.HealthContributor;
@@ -35,6 +36,27 @@ import org.springframework.boot.actuate.health.HealthIndicator;
 public abstract class CompositeHealthContributorConfiguration<I extends HealthIndicator, B>
 		extends AbstractCompositeHealthContributorConfiguration<HealthContributor, I, B> {
 
+	/**
+	 * Creates a {@code CompositeHealthContributorConfiguration} that will use reflection
+	 * to create {@link HealthIndicator} instances.
+	 * @deprecated since 3.0.0 in favor of
+	 * {@link #CompositeHealthContributorConfiguration(Function)}
+	 */
+	@Deprecated(since = "3.0.0", forRemoval = true)
+	public CompositeHealthContributorConfiguration() {
+		super();
+	}
+
+	/**
+	 * Creates a {@code CompositeHealthContributorConfiguration} that will use the given
+	 * {@code indicatorFactory} to create {@link HealthIndicator} instances.
+	 * @param indicatorFactory the function to create health indicator instances
+	 * @since 3.0.0
+	 */
+	public CompositeHealthContributorConfiguration(Function<B, I> indicatorFactory) {
+		super(indicatorFactory);
+	}
+
 	@Override
 	protected final HealthContributor createComposite(Map<String, B> beans) {
 		return CompositeHealthContributor.fromMap(beans, this::createIndicator);

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/CompositeReactiveHealthContributorConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -17,6 +17,7 @@
 package org.springframework.boot.actuate.autoconfigure.health;
 
 import java.util.Map;
+import java.util.function.Function;
 
 import org.springframework.boot.actuate.health.CompositeReactiveHealthContributor;
 import org.springframework.boot.actuate.health.ReactiveHealthContributor;
@@ -35,6 +36,27 @@ import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
 public abstract class CompositeReactiveHealthContributorConfiguration<I extends ReactiveHealthIndicator, B>
 		extends AbstractCompositeHealthContributorConfiguration<ReactiveHealthContributor, I, B> {
 
+	/**
+	 * Creates a {@code CompositeReactiveHealthContributorConfiguration} that will use
+	 * reflection to create {@link ReactiveHealthIndicator} instances.
+	 * @deprecated since 3.0.0 in favor of
+	 * {@link #CompositeReactiveHealthContributorConfiguration(Function)}
+	 */
+	@Deprecated(since = "3.0.0", forRemoval = true)
+	public CompositeReactiveHealthContributorConfiguration() {
+		super();
+	}
+
+	/**
+	 * Creates a {@code CompositeReactiveHealthContributorConfiguration} that will use the
+	 * given {@code indicatorFactory} to create {@link ReactiveHealthIndicator} instances.
+	 * @param indicatorFactory the function to create health indicator instances
+	 * @since 3.0.0
+	 */
+	public CompositeReactiveHealthContributorConfiguration(Function<B, I> indicatorFactory) {
+		super(indicatorFactory);
+	}
+
 	@Override
 	protected final ReactiveHealthContributor createComposite(Map<String, B> beans) {
 		return CompositeReactiveHealthContributor.fromMap(beans, this::createIndicator);

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/influx/InfluxDbHealthContributorAutoConfiguration.java

@@ -45,6 +45,10 @@ import org.springframework.context.annotation.Bean;
 public class InfluxDbHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<InfluxDbHealthIndicator, InfluxDB> {
 
+	public InfluxDbHealthContributorAutoConfiguration() {
+		super(InfluxDbHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "influxDbHealthIndicator", "influxDbHealthContributor" })
 	public HealthContributor influxDbHealthContributor(Map<String, InfluxDB> influxDbs) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/jms/JmsHealthContributorAutoConfiguration.java

@@ -45,6 +45,10 @@ import org.springframework.context.annotation.Bean;
 public class JmsHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<JmsHealthIndicator, ConnectionFactory> {
 
+	public JmsHealthContributorAutoConfiguration() {
+		super(JmsHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "jmsHealthIndicator", "jmsHealthContributor" })
 	public HealthContributor jmsHealthContributor(Map<String, ConnectionFactory> connectionFactories) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/ldap/LdapHealthContributorAutoConfiguration.java

@@ -45,6 +45,10 @@ import org.springframework.ldap.core.LdapOperations;
 public class LdapHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<LdapHealthIndicator, LdapOperations> {
 
+	public LdapHealthContributorAutoConfiguration() {
+		super(LdapHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "ldapHealthIndicator", "ldapHealthContributor" })
 	public HealthContributor ldapHealthContributor(Map<String, LdapOperations> ldapOperations) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/mail/MailHealthContributorAutoConfiguration.java

@@ -44,6 +44,10 @@ import org.springframework.mail.javamail.JavaMailSenderImpl;
 public class MailHealthContributorAutoConfiguration
 		extends CompositeHealthContributorConfiguration<MailHealthIndicator, JavaMailSenderImpl> {
 
+	public MailHealthContributorAutoConfiguration() {
+		super(MailHealthIndicator::new);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean(name = { "mailHealthIndicator", "mailHealthContributor" })
 	public HealthContributor mailHealthContributor(Map<String, JavaMailSenderImpl> mailSenders) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/neo4j/Neo4jHealthContributorConfigurations.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -43,6 +43,10 @@ class Neo4jHealthContributorConfigurations {
 	@Configuration(proxyBeanMethods = false)
 	static class Neo4jConfiguration extends CompositeHealthContributorConfiguration<Neo4jHealthIndicator, Driver> {
 
+		Neo4jConfiguration() {
+			super(Neo4jHealthIndicator::new);
+		}
+
 		@Bean
 		@ConditionalOnMissingBean(name = { "neo4jHealthIndicator", "neo4jHealthContributor" })
 		HealthContributor neo4jHealthContributor(Map<String, Driver> drivers) {
@@ -56,6 +60,10 @@ class Neo4jHealthContributorConfigurations {
 	static class Neo4jReactiveConfiguration
 			extends CompositeReactiveHealthContributorConfiguration<Neo4jReactiveHealthIndicator, Driver> {
 
+		Neo4jReactiveConfiguration() {
+			super(Neo4jReactiveHealthIndicator::new);
+		}
+
 		@Bean
 		@ConditionalOnMissingBean(name = { "neo4jHealthIndicator", "neo4jHealthContributor" })
 		ReactiveHealthContributor neo4jHealthContributor(Map<String, Driver> drivers) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/r2dbc/ConnectionFactoryHealthContributorAutoConfiguration.java

@@ -49,6 +49,7 @@ public class ConnectionFactoryHealthContributorAutoConfiguration
 	private final Map<String, ConnectionFactory> connectionFactory;
 
 	ConnectionFactoryHealthContributorAutoConfiguration(Map<String, ConnectionFactory> connectionFactory) {
+		super(ConnectionFactoryHealthIndicator::new);
 		this.connectionFactory = connectionFactory;
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/CompositeHealthContributorConfigurationReflectionTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2022 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.boot.actuate.autoconfigure.health;
+
+import org.springframework.boot.actuate.autoconfigure.health.CompositeHealthContributorConfigurationReflectionTests.TestHealthIndicator;
+import org.springframework.boot.actuate.health.AbstractHealthIndicator;
+import org.springframework.boot.actuate.health.Health.Builder;
+import org.springframework.boot.actuate.health.HealthContributor;
+
+/**
+ * Tests for {@link CompositeHealthContributorConfiguration} using reflection to create
+ * indicator instances.
+ *
+ * @author Phillip Webb
+ */
+@Deprecated(since = "3.0.0", forRemoval = true)
+class CompositeHealthContributorConfigurationReflectionTests
+		extends AbstractCompositeHealthContributorConfigurationTests<HealthContributor, TestHealthIndicator> {
+
+	@Override
+	protected AbstractCompositeHealthContributorConfiguration<HealthContributor, TestHealthIndicator, TestBean> newComposite() {
+		return new ReflectiveTestCompositeHealthContributorConfiguration();
+	}
+
+	static class ReflectiveTestCompositeHealthContributorConfiguration
+			extends CompositeHealthContributorConfiguration<TestHealthIndicator, TestBean> {
+
+	}
+
+	static class TestHealthIndicator extends AbstractHealthIndicator {
+
+		TestHealthIndicator(TestBean testBean) {
+		}
+
+		@Override
+		protected void doHealthCheck(Builder builder) throws Exception {
+			builder.up();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/CompositeHealthContributorConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -37,6 +37,10 @@ class CompositeHealthContributorConfigurationTests
 	static class TestCompositeHealthContributorConfiguration
 			extends CompositeHealthContributorConfiguration<TestHealthIndicator, TestBean> {
 
+		TestCompositeHealthContributorConfiguration() {
+			super(TestHealthIndicator::new);
+		}
+
 	}
 
 	static class TestHealthIndicator extends AbstractHealthIndicator {

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/CompositeReactiveHealthContributorConfigurationReflectionTests.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2012-2022 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.boot.actuate.autoconfigure.health;
+
+import reactor.core.publisher.Mono;
+
+import org.springframework.boot.actuate.autoconfigure.health.CompositeReactiveHealthContributorConfigurationReflectionTests.TestReactiveHealthIndicator;
+import org.springframework.boot.actuate.health.AbstractReactiveHealthIndicator;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Health.Builder;
+import org.springframework.boot.actuate.health.ReactiveHealthContributor;
+
+/**
+ * Tests for {@link CompositeReactiveHealthContributorConfiguration} using reflection to
+ * create indicator instances.
+ *
+ * @author Phillip Webb
+ */
+@Deprecated(since = "3.0.0", forRemoval = true)
+class CompositeReactiveHealthContributorConfigurationReflectionTests extends
+		AbstractCompositeHealthContributorConfigurationTests<ReactiveHealthContributor, TestReactiveHealthIndicator> {
+
+	@Override
+	protected AbstractCompositeHealthContributorConfiguration<ReactiveHealthContributor, TestReactiveHealthIndicator, TestBean> newComposite() {
+		return new TestCompositeReactiveHealthContributorConfiguration();
+	}
+
+	static class TestCompositeReactiveHealthContributorConfiguration
+			extends CompositeReactiveHealthContributorConfiguration<TestReactiveHealthIndicator, TestBean> {
+
+	}
+
+	static class TestReactiveHealthIndicator extends AbstractReactiveHealthIndicator {
+
+		TestReactiveHealthIndicator(TestBean testBean) {
+		}
+
+		@Override
+		protected Mono<Health> doHealthCheck(Builder builder) {
+			return Mono.just(builder.up().build());
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/CompositeReactiveHealthContributorConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -40,6 +40,10 @@ class CompositeReactiveHealthContributorConfigurationTests extends
 	static class TestCompositeReactiveHealthContributorConfiguration
 			extends CompositeReactiveHealthContributorConfiguration<TestReactiveHealthIndicator, TestBean> {
 
+		TestCompositeReactiveHealthContributorConfiguration() {
+			super(TestReactiveHealthIndicator::new);
+		}
+
 	}
 
 	static class TestReactiveHealthIndicator extends AbstractReactiveHealthIndicator {