Creating an ES using Java + exposing SAP functionalities as an ES

Hi experts,
I am new to SOA and need to learn more about defining new enterprise service.
My skill set is basically Java and J2ee concepts including web services.
As a webservice programmer, I can understand the interesting concept of SOA.
And I wanted to practise on SOA, by defining a simple ES and build a simple business process based on that.
Now I have downloaded NWDS , NW Composition environment and ESR.
I have also practised some WD, EP and VC.
Do I need any more s/w to be downloaded?
Now can any of you suggest,
1)Steps needed to define and build a new ES using Java?
2)How to expose simple SAP functionalities as an enterprise service?
3)Last step and the only step I know is to build a business process using VC. But, can any of you suggest a simple business process for me to compose and practise, using enterprise services built in Java, or enterprise services exposing a SAP functionality ?
Thanks in advance,
Aravind.

Hi Aravind,
Do I need any more s/w to be downloaded?
No, these are sufficient to approach towards Business process, compsition and ESOA .
1)Steps needed to define and build a new ES using Java?
Enterprise services are currently being implemented by customers, partners or SAP itself. May be in future they come up with something.
J2EE Web Services can be developed with web servers and tools, But ES is more of business semantics instead of technical one.
The main difference between SOA and ESOA is approch.
Earlier anything we were exposing with Web Services , we were calling it as SOA.i.e we were/are exposing already developed functions as web service for better interoperatibility.
ESOA is defining services in such a way that they are useful for reuability with business semantics and implementation is done after preparing the interface.
Currently, it is not much clear to provide implementation with ABAP or JAVA or wahat are pros/cons of any approach except that what skills are available.
You will not be able to develop an Enterprise Services, but merely you can simple develop and deploy any Web Service.
2)How to expose simple SAP functionalities as an enterprise service?
Again, this is done by SAP. You can expose Function Modules(ABAP) as a web Service but that is not true ESOA approach.
3)Last step and the only step I know is to build a business process using VC. But, can any of you suggest a simple business process for me to compose and practise, using enterprise services built in Java, or enterprise services exposing a SAP functionality ?
CAF( complete J2EE solution) is maily used to define Business Process with user interaction. You can find a lot of tutorials in SDN.
Hope this helps.
Regards,
Piyush

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