SAPJVM for Netweaver 7.4

Hi experts,

We are planning to install SAP PI 7.4 with AIX 7.1 and oracle 11g.

Referring to following blog, (13th point SAPJVM)

http://scn.sap.com/community/netweaver-administrator/blog/2012/05/22/whats-new-in-sap-netweaver-73--a-basis-perspective-part-ii

in NW 7.3 on wards, we don't need to install the SAPJVM, before we start with SAP installation.

is it so??

If SAPJVM is installed by SAPINSTALLER, then what about the environmental variable JAVA_HOME? This environmental variable is set by SAPINSTALLER itself? or we need to set it manually?

Kindly help.

Regards,

Amit.