HowTo: change Group Picker (multiple groups) with scriptrunner / post-function

[Tim S_]

Hi,

I try to set an MultiGroupPicker custom field with multiple groups. The setting with 'setCustomFieldValue' works fine.

...
List<Group> accessGroups = (List<Group>) mutableIssue.getCustomFieldValue(multiGroupCf);
if(accessGroups != null)
{
  accessGroups.add(groupManager.getGroupObject(it));
  //set custom field
  mutableIssue.setCustomFieldValue(multiGroupCf, [accessGroups]);
}
...

 But if I update the issue with

    ComponentAccessor.getIssueManager().updateIssue(currentUser, mutableIssue, EventDispatchOption.DO_NOT_DISPATCH, false);

I get the following error

...
java.lang.ClassCastException: java.util.ArrayList cannot be cast to com.atlassian.crowd.embedded.api.Group
...

Maybe someone can help me with this problem.

[Tim S_ · Accepted solution]

I found it. The bracktes were to much:

mutableIssue.setCustomFieldValue(multiGroupCf, accessGroups);