Directory structure for ABAP+JAVA Dialog Instance

Hello,
Can any one clarify how will be the directory structure in a case where we have ABAP+Java System?
For Central Instance,DVEBMGS<instance no>
Central Services,SCS<instance no+1>
Ex:DVEBMGS20
SCS21
If I have another dialog instance,can I have only ABAP or only Java in that?What will be the directory structure?But I read that they will be in 1:1 ratio
Will it be D22(Only ABAP) or J22(Java only).
As a dialog instance,can ABAP exist with out JAVA.
or can JAVA exist without ABAP
Please explain the directory structure with an example.
Thanks,
Sudheer.

Sudheer,
http://www.redbooks.ibm.com/redpapers/pdfs/redp4200.pdf page No 24 should help you...

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Directory structure for ABAP+JAVA Dialog Instance

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