3090602 - AS JAVA fails to start with exit code 2150: JCO_ERROR_CONFIGURATION: Parameter backend host ('ashost') is missing

The SAP NetWeaver Java application server startup fails with error code 2150 with ABAP user store.

From /usr/sap/<SID>/<inst_nr>/work/dev_server0 log file you can see:
ERROR => Java node 'server0' terminated with exit code 2150.

The reason of the startup is recorded in std_server0.out file:
************************************
  Service [com.sap.security.core.ume.service] start ================= ERROR ================= 
  CSN Component [BC-JAS-SEC-UME], DC Name [sap.com/com.sap.security.core.ume.service]
com.sap.engine.frame.ServiceException: Start of UME service failed. Check help topic "Start of UME Service Failed". Technical details: com.sap.conn.jco.JCoException: (101) JCO_ERROR_CONFIGURATION: Parameter backend host ('ashost') is missing
...
Caused by: com.sap.security.core.persistence.datasource.PersistenceException: com.sap.conn.jco.JCoException: (101) JCO_ERROR_CONFIGURATION: Parameter backend host ('ashost') is missing
...
Caused by: com.sap.conn.jco.JCoException: (101) JCO_ERROR_CONFIGURATION: Parameter backend host ('ashost') is missing
...
Caused by: RfcException: [null]
    message: Parameter backend host ('ashost') is missing
    Return code: RFC_INVALID_PARAMETER(19)
    error group: 101
    key: RFC_ERROR_PROGRAM
...
FATAL: Critical shutdown with exit code [2150] was requested due to [AS Java cannot be started; core service [com.sap.security.core.ume.service] failed to start]

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• SAP NetWeaver AS Java
• UME user store is ABAP

UME, failed, ashost, missing, com.sap.conn.jco.JCoException, JCO_ERROR_CONFIGURATION, RFC_INVALID_PARAMETER, UMEBackendConnection, RfcException, Exit code 2150 , KBA , BC-JAS-SEC-UME , User Management Engine , Problem