Hi,
potentially, you are thing of SAP HANA Enterprise Cloud (HEC)? There you can have an ERP provided by SAP, as HEC is an IaaS. SAP HANA Cloud Platform, however, the topic of this forum, is a PaaS, a platfor, on which you can develop your applications. Firstly, in JavaScript within the HANA database, and secondly, in JVM based languages, Java as the original one, Scala, JRuby, Clojure, ... as other ones. All the operations around the operating system and application lifecycle is hidden from developers and taken care by HANA Cloud Platform teams.
Best regards,
Markus