http://confluence.atlassian.com/display/JIRAEXT/JIRA+QuickBuild+Plugin

Plugin Version: 1.2.1

On the JIRA side, entering a mapping > 255 characters long throws an exception:

17:10:23,191 ERROR [EditService] Error occurred trying to update service properties: com.opensymphony.module.propertyset.IllegalPropertyException: String exceeds 255 characters.
com.opensymphony.module.propertyset.IllegalPropertyException: String exceeds 255 characters.
        at com.opensymphony.module.propertyset.AbstractPropertySet.setString(AbstractPropertySet.java:365)
        at com.atlassian.jira.configurableobjects.ConfigurableObjectUtil.createPropertySet(ConfigurableObjectUtil.java:42)
        at com.atlassian.jira.service.OfBizServiceConfigStore.editServiceConfig(OfBizServiceConfigStore.java:72)
        at com.atlassian.jira.service.DefaultServiceManager.editService(DefaultServiceManager.java:118)
        at com.atlassian.jira.web.action.admin.EditService.doExecute(EditService.java:38)