I'm writting an application which needs to be able to create tickets using the RESTful API. I'm using the java rest client (version 1.0) to do this. When creating issues, I need to populate two custom fields. At the moment I'm using the custom field id customfield_10021 for example. Am I am able to set the field value by the actual name of the field, or look up the field id by its name in some way. I'm not eager to leave the custom field ids hard coded as I imagine they'll be different on different JIRA instances (we actually have 3 running, a local develoment copy, a test instance and a production instance).