This space is only for NWSSO, the product that can be separately licensed from SAP. It is an option to the out-of-the-box SSO capabilities of SAP NetWeaver. You might have better luck trying in the SAP NetWeaver Portal space. To answer your question, yes you can configure SPNEGO on AS JAVA and keep using ABAP UME, you will probably use the user mapping mode Principal only. See the respective chapter of the application help for details.
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