User Guide > About the User Guide > Codebeamer: Common Concepts > Trackers and Items > Synchronizing Trackers with Atlassian JIRA > Add Support for Special JIRA Custom Fields > Development Environment > MetaData
MetaData
If you need to make adjustments to the JIRA custom field schema mapping, then your @CustomField extension must also provide a @CustomField.MetaData method.
The method can have any name, return type and can request the following context information using parameters of the appropriate type:
• JiraImportController: To receive the controller of the current JIRA import.
• TrackerLayoutLabelDto: To receive the Codebeamer tracker field definition that should be mapped to the JIRA custom field.
• ObjectNode: To receive the JIRA custom field JSON schema as provided by the JIRA REST API.
For example: Checklist for Jira:


package com.intland.codebeamer.controller.jira;

import org.springframework.stereotype.Component;

import com.fasterxml.jackson.databind.node.ObjectNode;

import com.intland.codebeamer.controller.jira.CustomField;

import com.intland.codebeamer.controller.jira.JiraImportController;

import com.intland.codebeamer.persistence.dto.TrackerLayoutLabelDto;


@Component("com.okapya.jira.checklist:checklist")

@CustomField(type="WikiText", of="Checklist")

public class ChecklistForJiraField {


   @CustomField.MetaData

   public void setMetaData(TrackerLayoutLabelDto field, ObjectNode metaData, JiraImportController controller) {

    // In the JIRA REST-API schema, a checklist field is an array of checklist items, but in CB it's a single value WIKI field'

    field.setMultipleSelection(Boolean.FALSE);

    // The default value (options) of a checklist, are available in the "allowedValues" property. Only status ID is available with Meta API's. The status name is not.'

    field.setDefaultValue(importChecklist(null, metaData.remove("allowedValues"), controller));



    // Place checklist on own row with full width

    field.setBreakRow(Boolean.TRUE);

    field.setColspan(Integer.valueOf(3));

   }

}
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