Problem
We're experiencing loads of these errors in our Jira log... nearly 300k in 2 days :
2018-04-26 11:19:10,495 http-nio-8080-exec-6 WARN <username> 679x59888x11 fnw9cw 127.0.0.1 /rest/timesheet-gadget/1.0/timesheet.json [c.a.jira.ofbiz.ConnectionPoolHealthSqlInterceptor] Dangerous use of multiple connections: replaced => count=0; marks=[-1-0]; pool=6/20
This causes the available db connection pool to get exhausted and is causing the entire Jira instance to crash.
Solution
Unfortunately, this problem has no clear solution, please contact Atlassian Support for help.
Note, stopping JIRA service, rebooting the DB server, then starting JIRA service might help.
See also issue#1066.
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