The groovy classes placed in the src/groovy
folder does not have dependency injection by default. However we can can access service classes using servlet context.
package com.example.ExampleClass
import org.codehaus.groovy.grails.web.context.ServletContextHolder
import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes
class ExampleClass {
def context = ServletContextHolder.servletContext.getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT)
def exampleService = context.exampleService
}