Setting up Confluence with MySQL datasource throws ERROR on getMySQLDatabaseName and checkMySQLStorageEngineType although it succeed eventually

2012-05-16 16:38:11,020 INFO [http-8090-4] [springframework.web.context.ContextLoader] initWebApplicationContext Root WebApplicationContext: initialization completed in 29033 ms
2012-05-16 16:38:11,093 ERROR [http-8090-4] [atlassian.config.bootstrap.DefaultAtlassianBootstrapManager] getMySQLDatabaseName There was an error finding your hibernate connection url.
 -- referer: http://localhost:8090/setup/setupdatasourcedb-start.action?database=mysql | url: /setup/setupdatasourcedb.action | userName: anonymous | action: setupdatasourcedb
2012-05-16 16:38:11,096 ERROR [http-8090-4] [atlassian.config.bootstrap.DefaultAtlassianBootstrapManager] checkMySQLStorageEngineType Your database Storage Engine could not be determined. Using the MyISAM engine can result in data integrity issues. Please see http://confluence.atlassian.com/x/voTcDQ for more information.
 -- referer: http://localhost:8090/setup/setupdatasourcedb-start.action?database=mysql | url: /setup/setupdatasourcedb.action | userName: anonymous | action: setupdatasourcedb
2012-05-16 16:39:16,276 INFO [http-8090-4] [atlassian.plugin.manager.DefaultPluginManager] shutdown Shutting down the plugin system
2012-05-16 16:39:16,609 INFO [http-8090-4] [atlassian.plugin.manager.DefaultPluginManager] init Initialising the plugin system