Grails create instance of inner class of service

Question

In Grails, services are singletons by default. Can I keep it that way and still create an instance of an inner class of that service from a controller?

//by default grails makes MyTestService a singlton
class MyTestService{

     public class InnerTest{
          String msg;
          def addMsg(String str){
               this.msg=str;
          }
          def printMsg(){
             println this.msg;
         }
     }

}

In controller "MyController"...

def m=myTestService.getInstance().new InnerTest();
//produces " MyTestService.InnerTest cannot be cast to MyTestService.InnerTest"

 def m=myTestService.new InnerTest();
//No signature of method:MyController.InnerTest()

yep the errors it produces are in the code comments. Is the cannot be cast error due to the singleton nature of the service? — user2782001, Apr 16 '15 at 23:48

M. Adam Kendall · Accepted Answer · 2015-04-17T00:28:55.013

1

You should be able to do something like:

class MyTestService{

     public class InnerTest{
          String msg;
          def addMsg(String str){
               this.msg=str;
          }
          def printMsg(){
             println this.msg;
         }
     }

     def InnerTestFactory() {
        new InnerTest()
     }

}

And use it from your controller:

def m=myTestService.InnerTestFactory();

edited Apr 17 '15 at 00:28

answered Apr 17 '15 at 00:07

M. Adam Kendall

1,202
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8

still get "No signature of method: MyTestService.InnerTest()" using the InnerTestFactory approach – user2782001 Apr 17 '15 at 00:15
Ok, using InnerTestFactory method, don't use `this` just `new InnerTest()` – M. Adam Kendall Apr 17 '15 at 00:28

Grails create instance of inner class of service

1 Answers1