While deploying any components for a Java system, in case there was no valid maintenance certificate installed, the validation of the deployment queue was only ending with status warning and it was possible to continue with deployment without being mandatory to install the certificate, like this:
But with the latest SUM versions, I am not sure since when exactly, but I think it is somewhere since some patch of SUM SP21 this has changed and the installation of the maintenance certificate cannot be skipped anymore and this error will show up: “Validation of deployment queue completed with error: No valid Maintenance Certificate found on AS Java with SID XXX. For more information, refer to SAP Note 1236587 … ”
So in order to pass the error a valid maintenance certificate is mandatory to be installed for the Java application server. How to do that? First generate a new certificate on SAP Support Portal:
https://launchpad.support.sap.com/ => System Operations and Maintenance -> License Keys -> Select installation number -> Select the respective SID from the list -> Select the current HW key, License type Licence Entitlement and press button Renew certificate or if there is already one that has a validity date that is not expired, press download button:
Now that we have the license, we can also install it. This can be done from NWA -> Configuration -> Infrastructure -> Licenses -> Select the Maintenance certificate from the list -> Install from file button
And now we have an up to date maintenance certificate, retry the step from SUM, that should continue with success.