RedisService withConnection broken due to unwired grailsApplication #72

Currently, calling redisService.withConnection throws a NullPointerException.

RedisService withConnection(String connectionName){
        if(grailsApplication.mainContext.containsBean("redisService${connectionName.capitalize()}")){
            return (RedisService)grailsApplication.mainContext.getBean("redisService${connectionName.capitalize()}")
        }
        ...
    }

Referencing grailsApplication.mainContext causes the exception, with the message being Cannot get property 'mainContext' on null object. I believe autowiring GrailsApplication is not done properly, seeing that this is the only method that makes use of this bean. I look a look at the tests, and it seems like even though retrieving the GrailsApplication bean is tested in a vacuum, the withConnection method itself is not touched.

Currently a workaround for this issue is adding the following to BootStrap.groovy.

def grailsApplication
    def redisService

    def init = { servletContext ->
        redisService.grailsApplication = grailsApplication
    }