Script Field throwing Marshalling Exception on Issue Creation

[John Hastings-Kimball]

Script gods, 

I have created a short script field that looks up values from an issue picker field to display to the user in forms and reports. This seems to work well enough except for issue creation where it's throwing a serializer error - although the issue is still properly created.

This is the script:

import com.atlassian.jira.component.ComponentAccessor


def issueManager = ComponentAccessor.getIssueManager()
def customFieldManager = ComponentAccessor.getCustomFieldManager()

//lookup the Feature Group value from the Feature issue then get the Feature Group issue object
def fgField = customFieldManager.getCustomFieldObjectByName("Feature Group")
def fgIssueKey = issue.getCustomFieldValue(fgField).toString()
def fgIssue = issueManager.getIssueObject(fgIssueKey)

//get the Context value from the Feature Group issue object
def context = customFieldManager.getCustomFieldObjectByName("Context")
def contextValue = fgIssue.getCustomFieldValue(context);

//return the value to the script field
return contextValue

this is the error: 

Exception occurred: com.atlassian.plugins.rest.common.json.JsonMarshallingException: org.codehaus.jackson.map.JsonMappingException: No serializer found for class com.atlassian.jira.issue.customfields.option.LazyLoadedOption and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: com.atlassian.jira.quickedit.rest.api.field.QuickEditFields["createdIssueDetails"]->com.atlassian.jira.rest.v2.issue.IssueBean["fields"]->java.util.HashMap["customfield_17317"])

any help would be greatly appreciated!

[Peter-Dave Sheehan · Accepted solution]

Is your "Context" field a single select by any chance?

Is so, the contextValue is returned as "LazyLoadedOption".

So try to return like this:

return contextValue?.value

[John Hastings-Kimball]

@Peter-Dave Sheehan that did the trick!  thank you. I made a couple other updates to get rid of the static type errors and my final script looks like this: 

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.customfields.option.LazyLoadedOption

def issueManager = ComponentAccessor.getIssueManager()
def customFieldManager = ComponentAccessor.getCustomFieldManager()

//lookup the Feature Group value from the Feature issue then get the Feature Group Issue
def fgField = customFieldManager.getCustomFieldObjectByName("Feature Group")
def fgIssueKey = issue.getCustomFieldValue(fgField).toString()
def fgIssue = issueManager.getIssueObject(fgIssueKey)

//get the Context value from the Feature Group issue
def contextFld = customFieldManager.getCustomFieldObjectByName("Context")
def contextValue = getCustomFieldValue(contextFld) as LazyLoadedOption;

//retrun the value to the script field
return contextValue?.value

[Azfar Masut]

alternative method/way but similar concept, broken down for simpler understanding

import com.atlassian.jira.component.ComponentAccessor

def modRating
//select list field below
def modVerRatingField = customFieldManager.getCustomFieldObjectsByName("Final Materiality Rating").first()

//modRating = focusIssue.getCustomFieldValue(modVerRatingField)?:0
//using above will throw the error. use below when calling the select list value field

modRating = (focusIssue.getCustomFieldValue(modVerRatingField)?.value)?:0

return modRating