Can an AS-Java instance be added to an existing AS-ABAP?

Hi everyone!
I'm facing the following situation: can an AS-Java instance be installed on a existing AS-ABAP instance?
My development team wants to activate the AS-Java in order to "publish" some ERP transactions to some web applications but that one has not been installed with the AS-ABAP instance we already have.
Can I add this Java instance to the ABAP instance or should I create an Java instance separately?
Any info or help is appreciated.
Best regards,
Paulo

Ok, Manoj. Thanks for your answer.
But I forgot to mention that my system is NW 7.0, not Web AS 6.20 or 6.40.
I have followed the link you sent and searched for the SAP note mentioned there - 914486 - but the info is restricted to Web AS 6.20/6.40 platforms, and there is nothing mentioned for NW 7.0.
I was reading some docs for NW 7.0, explaining the "usage types" of SAP systems. It says that a SAP system can be installed as a single AS ABAP or AS Java or altogether.
Since my system was installed as a single AS ABAP, now I'm not sure if I can simply add an AS Java instance to it. I'm considering now to install a separated AS Java instance and then make the appropriated "links" between those instances.
What do you think?
Have you ever been through such thing?
Sorry I'm bothering you with it but sometimes we haven't got noboby to discuss such things like that. Somebody's else experiences can always help us to make an appropriated decision.
Thanks in advance.
Paulo

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java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
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EPD,jdbc/pool/EPD,/sapmnt/EPD/global/security/data/SecStore.properties,/
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corresponding values for the Message server host and Message server port on the
Message Server and Bootstrap tab page. The connection details for dispatchers or
servers to the message server are maintained in the Cluster Manager. As shown in the
figure, the ms.host and ms.port are maintained, respectively, in the Cluster Manager
with Global Dispatcher and the Global Server. After you have maintained all of the
parameters, you can start the instances."

Can an AS-Java instance be added to an existing AS-ABAP?

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