How to wrap all Grails service methods with a Groovy closure?

Grails 2.4.x here.

I have a requirement that all the methods of all my Grails services, generated by grails create-service <xyz>, be "wrapped"/intercepted with the following logic:

try {
    executeTheMethod()
} catch(MyAppException maExc) {
    log.error(ExceptionUtils.getStackTrace(maExc))
    myAppExceptionHandler.handleOrRethrow(maExc)
}

Where:

• log.error(...) is the SLF4J-provided logger you get when you annotate your class with the @Slf4j annotation; and
• ExceptionUtils is the one from org.apache.commons:commons-lang3:3.4; and
• myAppExceptionHandler is of type com.example.myapp.MyAppExceptionHandler; and
• This behavior exists (or has the option to exist in the event that it needs to be explicitly called somehow) for each method defined in a Grails service

So obviously this wrapper code needs to include import statements for those classes as well.

So for example if I have a WidgetService that looks like this:

class WidgetService {
    WidgetDataService widgetDataService = new WidgetDataService()

    Widget getWidgetById(Long widgetId) {
        List<Widget> widgets = widgetDataService.getAllWidgets()
        widgets.each {
            if(it.id.equals(widgetId)) {
                return it
            }
        }

        return null
    }
}

Then after this Groovy/Grails/closure magic occurs I need the code to behave as if I had written it like:

import groovy.util.logging.Slf4j
import org.apache.commons.lang3.exception.ExceptionUtils
import com.example.myapp.MyAppExceptionHandler

@Slf4j
class WidgetService {
    WidgetDataService widgetDataService = new WidgetDataService()

    MyAppExceptionHandler myAppExceptionHandler = new MyAppExceptionHandler()

    Widget getWidgetById(Long widgetId) {
        try {
            List<Widget> widgets = widgetDataService.getAllWidgets()
            widgets.each {
                if(it.id.equals(widgetId)) {
                    return it
                }
            }

            return null
        } catch(MyAppException maExc) {
            log.error(ExceptionUtils.getStackTrace(maExc))
            myAppExceptionHandler.handleOrRethrow(maExc)
        }
    }
}

Any ideas as to how I might be able to achieve this? I'm worried that a pure Groovy closure might interfere somehow with whatever Grails is doing to its services under the hood at runtime (since they are all classes that don't explicitly extend a parent class).

Here is what I was trying to pin point in my comment:

package com.example

import groovy.util.logging.Log4j

@Log4j
trait SomeTrait {

    def withErrorHandler(Closure clos) {
        try {
            clos()
        } catch(Exception e) {
            log.error e.message
            throw new ApplicationSpecificException(
                "Application Specific Message: ${e.message}"
            )
        }
    }
}

Service class:

package com.example

class SampleService implements SomeTrait {

    def throwingException() {
        withErrorHandler {
            throw new Exception("I am an exception")
        }
    }

    def notThrowingException() {
        withErrorHandler {
            println "foo bar"
        }
    }
}

Test:

package com.example

import grails.test.mixin.TestFor
import spock.lang.Specification

@TestFor(SampleService)
class SampleServiceSpec extends Specification {

    void "test something"() {
        when:
        service.throwingException()

        then:
        ApplicationSpecificException e = thrown(ApplicationSpecificException)
        e.message == "Application Specific Message: I am an exception"
    }

    void "test something again"() {
        when:
        service.notThrowingException()

        then:
        notThrown(Exception)
    }
}

Here is the sample app.

Grails 3.0.9 but it should not matter. this is applicable for Grails 2.4.*