Configuration of chained transaction manager in SDN4 after migration from SDN3 - spring-data-neo4j-4

Question

At the moment I am trying to migrate from SDN3 to SDN4. In my project I use two databases: Neo4j and MySQL, so I end up with chained transaction manager. However, after migration I have problem with its configuration. Before the migration I had this:
#Bean(name = "transactionManager")
#Autowired
public PlatformTransactionManager neo4jTransactionManager(
LocalContainerEntityManagerFactoryBean entityManagerFactory, GraphDatabaseService graphDatabaseService)
throws Exception {
JtaTransactionManager neoTransactionManager = new JtaTransactionManagerFactoryBean(graphDatabaseService)
.getObject();
neoTransactionManager.setRollbackOnCommitFailure(true);
neoTransactionManager.setAllowCustomIsolationLevels(true);
JpaTransactionManager mysqlTransactioNmanager = new JpaTransactionManager(entityManagerFactory.getObject());
return new ChainedTransactionManager(mysqlTransactioNmanager, neoTransactionManager);
}
Now I have something like this:
#Bean(name = "transactionManager")
#Autowired
public PlatformTransactionManager neo4jTransactionManager(
LocalContainerEntityManagerFactoryBean entityManagerFactory, Neo4jTransactionManager neo4jTransactionManager)
throws Exception {
Neo4jTransactionManager neoTransactionManager = neo4jTransactionManager;
JpaTransactionManager mysqlTransactioNmanager = new JpaTransactionManager(entityManagerFactory.getObject());
return new ChainedTransactionManager(mysqlTransactioNmanager, neoTransactionManager);
}
However, project could not be deployed on server, because of this exception:
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public org.springframework.transaction.PlatformTransactionManager com.project.config.ApplicationConfig.neo4jTransactionManager(org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean,org.springframework.data.neo4j.transaction.Neo4jTransactionManager) throws java.lang.Exception; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.data.neo4j.transaction.Neo4jTransactionManager] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
When mentioned part of configuration is commented project is properly deployed, but obviously there is an exception concerning missing transaction during save to MySQL database.
How should I configure this chained transaction manager in SDN4? It is hard to find any examples now, because SDN4 is quite recent and I really need to have Neo4j in standalone mode, so migration seems to be a good idea.

Answer 1

With this configuration I managed to successfully deploy my application:
#Bean(name = "transactionManager")
#Autowired
public PlatformTransactionManager neo4jTransactionManager(
LocalContainerEntityManagerFactoryBean entityManagerFactory,
Session session) throws Exception {
Neo4jTransactionManager neoTransactionManager = new Neo4jTransactionManager(session);
JpaTransactionManager mysqlTransactioNmanager = new JpaTransactionManager(entityManagerFactory.getObject());
return new ChainedTransactionManager(mysqlTransactioNmanager,neoTransactionManager);
}
I had also to add this element to my config:
#Override
#Bean
#Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public Session getSession() throws Exception {
return super.getSession();
}