How to initialize the variables of domain class with the properties defined in config.groovy

Question

I have defined a variable in Config.groovy as below

environments {
    development {
        training.defaultStartTime = "09:00"

    }
    production {
        training.defaultStartTime = "09:00"
    }
}

Now I want to Initialize the variable startTime in my domain class using grailsApplication.config .defaultStartTime . I am doing as follows

class Training {
    def grailsApplication
    String startTime = grailsApplication.config.training.defaultStartTime
}

But getting an error

"Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Invocation of init method failed; nested exception is org.hibernate.InstantiationException: could not instantiate test objectcom.Training"

what is the best way to initialize the variables of domain class with the properties defined in config.groovy (grailsapplication)

Answer 1

The problem is due to the way injection works. The bean (in the case a domain class instance) is created using its default constructor, then the DI fields are set to the corresponding beans. But the startTime field is initialized in the constructor - before DI happens - so grailsApplication is null.

One workaround would be to create a custom constructor - see http://burtbeckwith.com/blog/?p=1003 for the details