Question

I installed the “executor” plugin into my Grails app to do some simple asynchronous processing; I’m not using Hibernate or any fancy persistence. Based on the documentation for the plugin, which can be found here https://github.com/basejump/grails-executor, the setup is very simple, just add the following to resources.groovy and I should be good to go…

//resources.groovy
    executorService( PersistenceContextExecutorWrapper ) { bean->
        bean.destroyMethod = 'destroy'
        persistenceInterceptor = ref("persistenceInterceptor")
        executor = Executors.newCachedThreadPool()
    }

I have not yet tried to use any of the asynchronous constructs in my code, but when I start up my grails app I see the following error…

Cannot resolve reference to bean 'persistenceInterceptor' while setting bean property 'persistenceInterceptor';
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No bean named 'persistenceInterceptor' is defined

The error makes sense since in I have not wired up any bean named persistenceInterceptor in resources.groovy , but according to the plugin documentation I don’t have to. Do I have to write a groovy class that implements the PersistenceContextInterceptor interface, and wire that up as the “persistenceInterceptor” bean? In the Setup section of the documentation, there is no mention of this..

Answer 1

I figured this out….

The persistenceInterceptor is referenced by the executor plugin configuration, so once you add the plugin to a Grails project, your code must wire up an instance of PersistenceContextInterceptor in resources.groovy. I mocked a class to implement the interface just to get around this for now, and it worked fine.

//resources.groovy
 persistenceInterceptor(  com.cache.DefaultCacheInterceptor){
}