When starting JIRA you get warnings of the following type:

2010-04-07 15:55:49,583 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.allowattachments' from database. Using default
2010-04-07 15:56:00,976 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.allowunassigned' from database. Using default
2010-04-07 15:58:40,379 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.indexing' from database. Using default
2010-04-07 15:58:43,264 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.issuelinking' from database. Using default
2010-04-07 15:58:43,264 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.user.externalmanagement' from database. Using default
2010-04-07 15:58:43,264 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.voting' from database. Using default
2010-04-07 15:58:43,264 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.option.watching' from database. Using default
2010-04-07 15:58:43,265 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.path.attachments.use.default.directory' from database. Using default
2010-04-07 15:58:43,265 main WARN [jira.config.properties.ApplicationPropertiesImpl] Exception getting property 'jira.path.index.use.default.directory' from database. Using default

These warnings don't affect any functionality and are just noise.