Are you sure the actual Java actions are in place? Sometimes people misplace them. I just had a look at the community module and the code in refreshClass.java should contain something like this:
// BEGIN USER CODE ORM.refreshClass(this, objectType); return true; // END USER CODE
And which entity type are you passing in this action? Which entity you have to refresh may depend on which entity is the owner of the association, as that is the place where the association is stored.
The microflow timer widget v1.2 did the trick if the start at once option is set to true. When the new location is made in content then after the closing of this screen the widget is triggered again and the screen refreshes.
But I really would like to know if I also could have done it with the jave refresh action. I hope someone of Mendix can give an axample on a string that refreshes a reference.
It is not possible to refresh a member directly. If there is an entity (+ xpath) is the source of the grid, then refresh that entity. If the source of the grid is a path, I think that refreshing the parent/context object should do the trick. But I am not sure about the latter one.
e.g: [Datagrid: Entity : B, xpath : [bladibal = bla]] -> AddrefreshClass("MyModule.B")
[Datagrid: Source : myassoc/myentity ] -> Refresh the context object
Interesting question, maybe someone should test it using a really simple project :)