Enter more than 6000+ char's in the issue description field. It throws java exception during issue edit event.

http://10.1.10.128:8080/secure/EditIssue.jspa

Form Errors:
Exception occurred: com.atlassian.core.AtlassianCoreException: Error in action: com.atlassian.jira.action.issue.IssueUpdate@eb3689, result: null: while updating: [GenericEntity:Issue][created,2003-12-05 16:50:51.0][summary,Java expception when you cross the limit of Level field while editing the project units.][timeoriginalestimate,null][workflowId,10018][component,null][fixfor,null][type,1][timespent,null][environment,][status,2][resolution,null][updated,2003-12-05 17:20:43.686][id,10018][timeestimate,null][key,DEF-18][duedate,null][