How to I bind a Hibernate Session to a thread in Grails?

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I'm writing a multi-threaded application in Grails and the additional threads need access to GORM/Hibernate. When they try to access GORM I get the error "org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here".

OK fair enough, can someone guide me on the best way to set the threads up to have access? The error message almost sounds like you just need to change some config options yet I sense, it is not so simple...

grails-orm hibernate-session grails
4 Answers

Luke Daley gave the right answer. Unfortunately, the links have changed. Thus, I'll update his answer and provide a code example to make this answer self-contained.

There is a bean in Grails applications called persistenceInterceptor that can be used for initializing the persistence context / session for Hibernate. You can inject the bean into one of your controller / service classes and start a new thread, e.g. using the following code snippet.

class YourControllerOrService {
    PersistenceContextInterceptor persistenceInterceptor
    
    def someOperation() {
        ...
        Runnable yourTask = { ->
            try {
                if (persistenceInterceptor) {
                    persistenceInterceptor.init()
                }
            
                // execute the hibernate operations here in a transaction,
                // e.g. call a method annotated with @Transactional
                ...
            } catch (Exception e) {
                    log.error('Your error message', e)
            } finally {
                if (persistenceInterceptor) {
                    persistenceInterceptor.flush()
                    persistenceInterceptor.destroy()
                }
            }
        }
        Thread workerThread = new Thread(yourTask)
        workerThread.start()
        ...
    }
}

You'll find an exemplary implementation in the Grails JMS plug-in on GitHub.

The PersistenceContextInterceptor interface can be found on GitHub, too.

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