https://userapps.support.sap.com/sap/support/knowledge/en/2009529
2009529 - JCO_ERROR_RESOURCE: Connection pool UMEBackendConnection - UME connection to ABAP...
UME connection issues occur to ABAP datasource due to the pool size of RFC destination "UMEBackendConnection" exhausted. The error message below have been...
resource connectionjcoerrorpoolume