Trying to create a REST endpoint using script runner

[Abyakta Lenka]

i am trying to create a small REST endpoint , please help

here is the small code i am working on. what am i missing ?

trying to add a user to a group

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.security.groups.GroupManager
import com.atlassian.jira.user.ApplicationUser

@BaseScript CustomEndpointDelegate delegate

addUserToGroup(httpMethod: "PUT", groups: ["jira-administrators"]) { MultivaluedMap queryParams, String body, HttpServletRequest request ->


GroupManager groupManager = ComponentAccessor.getGroupManager();
try
    {
    groupManager.addUserToGroup(((ApplicationUser) issue.getCustomFieldValue(ComponentAccessor.getCustomFieldManager().getCustomFieldObjectByName("ABCD"))).getDirectoryUser() , groupManager.getGroup("Group"))
    } catch (NullPointerException e){ }

[Nic Brough -Adaptavist-]

Duplicate of https://community.atlassian.com/t5/Atlassian-Marketplace-questions/REST-endpoint-using-ScriptRunner/qaq-p/601037#M33300