Advantages of JAVA stack on ECC 6.0

Hi There
Can any one please make me clear about the adavantages of  JAVA stack on ECC6.0, how does it helps our business, as tehre are no JAVA relaetd components in our environment , now we are on ECC6.0 ABAP stack, if this is the case how to  go ahead with JAVA stack, I mean to ask the of make my ECC6.0 as a dual stack , must i choose JAVA system as an Add-on to existing ECC ABAP stack or  must i go for another stand akone JAVA box, which option is the correct one.
Now we are on BW3.0
got a plan to upgrade to BI 7.0 , is JAVA system required for that or BI 7.0 only runs on ABAP stack?please let me know how to implemnt the JAVA stack for the existing system.Thanks in advanse.

HI
Kakani
Can you go thorough dis link
http://wiki.sdn.sap.com/wiki/display/WDJava/WelcometoWebDynproJava!
Tanks
Rafi Shaik

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