Revert "Adapt to Spring Data Neo4j now requiring a transaction manager"

This reverts commit b6467ed. Changes
in Spring Data Neo4j mean that these changes are no longer necessary.
They also caused a problem with multiple transaction managers being
present when mixing Neo4j and, say, Data JPA.

Closes gh-40895

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jDataAutoConfiguration.java

@@ -20,6 +20,7 @@
 
 import org.neo4j.driver.Driver;
 
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -29,18 +30,23 @@
 import org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration;
 import org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration;
 import org.springframework.boot.autoconfigure.transaction.TransactionManagerCustomizationAutoConfiguration;
+import org.springframework.boot.autoconfigure.transaction.TransactionManagerCustomizers;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Import;
 import org.springframework.data.neo4j.aot.Neo4jManagedTypes;
 import org.springframework.data.neo4j.core.DatabaseSelectionProvider;
+import org.springframework.data.neo4j.core.Neo4jClient;
+import org.springframework.data.neo4j.core.Neo4jOperations;
+import org.springframework.data.neo4j.core.Neo4jTemplate;
 import org.springframework.data.neo4j.core.convert.Neo4jConversions;
 import org.springframework.data.neo4j.core.mapping.Neo4jMappingContext;
 import org.springframework.data.neo4j.core.schema.Node;
 import org.springframework.data.neo4j.core.schema.RelationshipProperties;
 import org.springframework.data.neo4j.core.transaction.Neo4jTransactionManager;
+import org.springframework.data.neo4j.repository.config.Neo4jRepositoryConfigurationExtension;
 import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.TransactionManager;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Spring Data Neo4j.
@@ -58,7 +64,6 @@
 @ConditionalOnClass({ Driver.class, Neo4jTransactionManager.class, PlatformTransactionManager.class })
 @EnableConfigurationProperties(Neo4jDataProperties.class)
 @ConditionalOnBean(Driver.class)
-@Import({ Neo4jTransactionManagerConfiguration.class, Neo4jTransactionalComponentsConfiguration.class })
 public class Neo4jDataAutoConfiguration {
 
 	@Bean
@@ -91,4 +96,25 @@ public DatabaseSelectionProvider databaseSelectionProvider(Neo4jDataProperties p
 				: DatabaseSelectionProvider.getDefaultSelectionProvider();
 	}
 
+	@Bean(Neo4jRepositoryConfigurationExtension.DEFAULT_NEO4J_CLIENT_BEAN_NAME)
+	@ConditionalOnMissingBean
+	public Neo4jClient neo4jClient(Driver driver, DatabaseSelectionProvider databaseNameProvider) {
+		return Neo4jClient.create(driver, databaseNameProvider);
+	}
+
+	@Bean(Neo4jRepositoryConfigurationExtension.DEFAULT_NEO4J_TEMPLATE_BEAN_NAME)
+	@ConditionalOnMissingBean(Neo4jOperations.class)
+	public Neo4jTemplate neo4jTemplate(Neo4jClient neo4jClient, Neo4jMappingContext neo4jMappingContext) {
+		return new Neo4jTemplate(neo4jClient, neo4jMappingContext);
+	}
+
+	@Bean(Neo4jRepositoryConfigurationExtension.DEFAULT_TRANSACTION_MANAGER_BEAN_NAME)
+	@ConditionalOnMissingBean(TransactionManager.class)
+	public Neo4jTransactionManager transactionManager(Driver driver, DatabaseSelectionProvider databaseNameProvider,
+			ObjectProvider<TransactionManagerCustomizers> optionalCustomizers) {
+		Neo4jTransactionManager transactionManager = new Neo4jTransactionManager(driver, databaseNameProvider);
+		optionalCustomizers.ifAvailable((customizer) -> customizer.customize((TransactionManager) transactionManager));
+		return transactionManager;
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jReactiveDataAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 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.
@@ -30,7 +30,6 @@
 import org.springframework.data.neo4j.core.ReactiveNeo4jOperations;
 import org.springframework.data.neo4j.core.ReactiveNeo4jTemplate;
 import org.springframework.data.neo4j.core.mapping.Neo4jMappingContext;
-import org.springframework.data.neo4j.core.transaction.ReactiveNeo4jTransactionManager;
 import org.springframework.data.neo4j.repository.config.ReactiveNeo4jRepositoryConfigurationExtension;
 import org.springframework.transaction.ReactiveTransactionManager;
 
@@ -69,11 +68,4 @@ public ReactiveNeo4jTemplate reactiveNeo4jTemplate(ReactiveNeo4jClient neo4jClie
 		return new ReactiveNeo4jTemplate(neo4jClient, neo4jMappingContext);
 	}
 
-	@Bean(ReactiveNeo4jRepositoryConfigurationExtension.DEFAULT_TRANSACTION_MANAGER_BEAN_NAME)
-	@ConditionalOnMissingBean(ReactiveTransactionManager.class)
-	ReactiveNeo4jTransactionManager rectiveNeo4jTransactionManager(Driver driver,
-			ReactiveDatabaseSelectionProvider databaseNameProvider) {
-		return new ReactiveNeo4jTransactionManager(driver, databaseNameProvider);
-	}
-
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/neo4j/Neo4jRepositoriesAutoConfiguration.java

@@ -20,13 +20,11 @@
 
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
-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.data.ConditionalOnRepositoryType;
 import org.springframework.boot.autoconfigure.data.RepositoryType;
 import org.springframework.context.annotation.Import;
-import org.springframework.data.neo4j.core.Neo4jTemplate;
 import org.springframework.data.neo4j.repository.Neo4jRepository;
 import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories;
 import org.springframework.data.neo4j.repository.config.Neo4jRepositoryConfigurationExtension;
@@ -54,7 +52,6 @@
 @AutoConfiguration(after = Neo4jDataAutoConfiguration.class)
 @ConditionalOnClass({ Driver.class, Neo4jRepository.class })
 @ConditionalOnMissingBean({ Neo4jRepositoryFactoryBean.class, Neo4jRepositoryConfigurationExtension.class })
-@ConditionalOnBean(Neo4jTemplate.class)
 @ConditionalOnRepositoryType(store = "neo4j", type = RepositoryType.IMPERATIVE)
 @Import(Neo4jRepositoriesRegistrar.class)
 public class Neo4jRepositoriesAutoConfiguration {