Access SAP BW from Java

Hello,
I need to build a Java web application that can collect and display data from various SAP BWs.
Write operations are not required. What is the easiest way to do that?
I found that SAP Open Hub Service lets you extract the data to a CSV file or a relational table.
Assuming I go the way of creating a relational table, the following questions arise:
- Where are those tables stored? Still within SAP BW or in an external relational DBMS (e.g. an Oracle database)?
- How can I access those tables from within my Java code (just through a standard JDBC driver)?
- Who initiates the population of those tables?
- Can I trigger the extraction at a given time from within my java code?
- If so, can I hand in filter critera, so that the table is populated only with data that matches my filter, or do I need to extract all data to the relational table and then filter at the next step?
- Can I have a timer in the SAP BW that creates the table on a certain schedule (e.g. once per day)?
What other (easier) options are there to achieve this task?
Thanks,
MARK
Edited by: M. Arnold on Aug 17, 2010 9:50 AM

Mark,
What you can look at are :
1. Use a JDBC connector to connect to the database directly - this has some obvious disadvantages because the data would have to be linked with the SID tables , text tables and Dimension tables for cubes which makes the process extremely cumbersome
2. Use Openhub to extract to a relational table and access the same - possible , but you have two steps in between - openhub to update table and then access the table while maintaining data consistency - this might become a maintenance nightmare once you heavily use this concept
3. Use web services - there are standard web services like query_view_data and rfc_read_tale which you can use - these web services are SOAP based and you should be able to use the same in your JAVA application
4. Use the BI JAVA SDK to connect to the backend through an API supported by SAP - this would be easy to use - the SDk should be available on SCN or on the support marketplace and you shoiuld be able to use the same quite easily
5. Use JCO and build the application using NWDS where you have native connectivity to SAP BW using JCO
6. Use Web Dynpro JAVA to develop your application where you should be able to access the necessary APIs wherever required.
Edited by: Arun Varadarajan on Aug 17, 2010 8:15 PM

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