Yes, you can. You will just have to figure out a way how to access AS JAVA in order to authenticate using SPNEGO so that the SAP Logon Ticket is issued and that it can be used to access AS ABAP. I have seen all kinds of implementations in the past including portal desktops with all the available backend systems as icons, definitely not what you would want. Nowadays since there are so many other SSO options available, customers usually choose something besides SAP Logon Tickets even if additional costs are involved. Companies usually also have a PKI which they can use to generate certificates for users. Both AS JAVA and AS ABAP support authentication based on X.509 user certificates.
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