Spring Mongo transactions Manager bean presence alters behaviour of save() for JPA repositories

Affects: \Spring framework 5.1, Spring boot - 2.1.1.RELEASE

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I have a use case to use Mongo transactions. For enabling transactions i followed the mongo transaction document In my application I have MySql DB connections as well.

Upon creating the mongo transaction bean, the JPA repositories save() method is not persisting data.

The JPA repositories save method works well, if I comment out MongoTransactionManager bean:

public class MongoTransactionConfiguration  extends AbstractMongoConfiguration {

    @Autowired
    private MongoProperties props;

/*    @Bean
    MongoTransactionManager transactionManager(MongoDbFactory dbFactory) {
        return new MongoTransactionManager(dbFactory);
    }*/

    @Override
    public MongoClient mongoClient() {
        return new MongoClient(new MongoClientURI(props.getUri()));
    }

    @Override
    protected String getDatabaseName() {
        return props.getDatabase();
    }
}

The sample code is available in github In this example I'm connecting to local host mysql, and as part of @PostConstruct of Application class, will try to populate a table.

The table gets populated when mongo transaction bean does not exists. But when the MongoTransactionBean exists nothing gets populated.

I expect to have MongoTransactions enabled and proper functioning of mysql save(). Could someone help me figure out how to overcome this issue?

Stackoverflow : https://stackoverflow.com/questions/56424920/mongo-transactions-manager-bean-presence-alters-behaviour-of-save-for-jpa-repo

Comment From: snicoll

I can see someone answered you on StackOverflow.