implement negative cache
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Key: MERCURY-126
URL: http://jira.codehaus.org/browse/MERCURY-126
Project: Mercury
Issue Type: Sub-task
Reporter: Oleg Gusakov-- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.codehaus.org/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
