Add auto-configuration for Spring Data Envers

spring-boot-project/spring-boot-autoconfigure/build.gradle

@@ -112,6 +112,7 @@ dependencies {
 	optional("org.springframework.batch:spring-batch-core")
 	optional("org.springframework.data:spring-data-couchbase")
 	optional("org.springframework.data:spring-data-jpa")
+	optional("org.springframework.data:spring-data-envers")
 	optional("org.springframework.data:spring-data-rest-webmvc")
 	optional("org.springframework.data:spring-data-cassandra")
 	optional("org.springframework.data:spring-data-elasticsearch") {

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/jpa/EnversRevisionRepositoriesRegistrar.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012-2020 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.autoconfigure.data.jpa;
+
+import org.springframework.boot.autoconfigure.data.AbstractRepositoryConfigurationSourceSupport;
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
+import org.springframework.core.env.Environment;
+import org.springframework.data.envers.repository.support.EnversRevisionRepositoryFactoryBean;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.data.jpa.repository.config.JpaRepositoryConfigExtension;
+import org.springframework.data.repository.config.BootstrapMode;
+import org.springframework.data.repository.config.RepositoryConfigurationExtension;
+import org.springframework.util.StringUtils;
+
+import java.lang.annotation.Annotation;
+import java.util.Locale;
+
+/**
+ * {@link ImportBeanDefinitionRegistrar} used to auto-configure Spring Data Envers
+ * Repositories.
+ *
+ * @author Stefano Cordio
+ */
+class EnversRevisionRepositoriesRegistrar extends JpaRepositoriesRegistrar {
+
+	@Override
+	protected Class<?> getConfiguration() {
+		return EnableJpaRepositoriesConfiguration.class;
+	}
+
+	@EnableJpaRepositories(repositoryFactoryBeanClass = EnversRevisionRepositoryFactoryBean.class)
+	private static class EnableJpaRepositoriesConfiguration {
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/jpa/JpaRepositoriesAutoConfiguration.java

@@ -26,6 +26,7 @@
 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.ConditionalOnMissingClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilderCustomizer;
 import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
@@ -35,6 +36,7 @@
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.task.AsyncTaskExecutor;
+import org.springframework.data.envers.repository.support.EnversRevisionRepositoryFactoryBean;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 import org.springframework.data.jpa.repository.config.JpaRepositoryConfigExtension;
@@ -57,6 +59,7 @@
  * @author Phillip Webb
  * @author Josh Long
  * @author Scott Frederick
+ * @author Stefano Cordio
  * @since 1.0.0
  * @see EnableJpaRepositories
  */
@@ -66,10 +69,23 @@
 @ConditionalOnMissingBean({ JpaRepositoryFactoryBean.class, JpaRepositoryConfigExtension.class })
 @ConditionalOnProperty(prefix = "spring.data.jpa.repositories", name = "enabled", havingValue = "true",
 		matchIfMissing = true)
-@Import(JpaRepositoriesRegistrar.class)
 @AutoConfigureAfter({ HibernateJpaAutoConfiguration.class, TaskExecutionAutoConfiguration.class })
 public class JpaRepositoriesAutoConfiguration {
 
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass(EnversRevisionRepositoryFactoryBean.class)
+	@Import(EnversRevisionRepositoriesRegistrar.class)
+	public static class EnversRevisionRepositoriesRegistrarConfiguration {
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnMissingClass("org.springframework.data.envers.repository.support.EnversRevisionRepositoryFactoryBean")
+	@Import(JpaRepositoriesRegistrar.class)
+	public static class JpaRepositoriesRegistrarConfiguration {
+
+	}
+
 	@Bean
 	@Conditional(BootstrapExecutorCondition.class)
 	public EntityManagerFactoryBuilderCustomizer entityManagerFactoryBootstrapExecutorCustomizer(