/*
* This example custom script validator script shows how you can define a multi line error message.
* "All right, title and interest in this code snippet shall remain the exclusive intellectual property of Adaptavist Group Ltd and its affiliates. Customers with a valid ScriptRunner
* license shall be granted a  non-exclusive, non-transferable, freely revocable right to use this code snippet only within their own instance of Atlassian products. This licensing notice cannot be removed or
* amended and must be included in any circumstances where the code snippet is shared by You or a third party."
*/


import com.opensymphony.workflow.InvalidInputException

// Create a map to store all errors in
Map<String,String> errors = [:]

// add in each error specifying its inxed in the map as the first paramater
// and the error message as the second paramater
errors.put("1", "Error line 1")
errors.put("2", "Error line 2")

// return the errors map which now contains the multiline error message
// Note this will return each line as a bullet point in the error message and the bullet points cannot be removed as these are added in by Jira itself and not by ScriptRunner. 
throw new InvalidInputException(errors)