Dealing with Transaction isolation level using SpringBoot

Question

I'm working on a Spring-Boot app and using Spring Boot version 1.5.9.

I have a method for payment transfer that contains a set of DB inserts, and I would like to make it Transactional with locking to avoid double spending. So I need to set the isolation level to Serializable. And this is what I've done:

@Transactional(isolation = Isolation.SERIALIZABLE)
public void transfer() {
...
}

The problem is that I'm getting the below exception when calling this method:

{
    "timestamp": 1539357851437,
    "status": 500,
    "error": "Internal Server Error",
    "exception": "org.springframework.transaction.InvalidIsolationLevelException",
    "message": "JtaTransactionManager does not support custom isolation levels by default - switch 'allowCustomIsolationLevels' to 'true'",
    "path": "app/transfer"
}

I'm new to Spring in general and SpringBoot doesn't seem to have an XML configuration that I can override to set allowCustomIsolationLevels to true for the JtaTransactionManager bean. But Instead i should use Java annotation and @Bean definitions and I'm not sure how to achieve my goal with this.

Any help would be apprciated!

Answer 1

If you'd like to use an XML file for configuration, in your main class that has the @SprintBootApplication annotation just add this:

@ImportResource("classpath:/static/context/name-of-context-file.xml")

Which will import the XML file from a path where the root is the resources directory in the project.

From what I can tell from Spring's Documentation , you'll want to look into potentially using the DataSourceTransactionManager or using the XML file like I mentioned, since according to that documentation (much like the error message states, but at least gives you the option of setting)

JTA does not support custom isolation levels.

I know that page I linked is long, but if you just do a find on the page for "custom isolation" it narrows it down to three options, two of which are right next to each other.

Hope this helps.