Java need in SAP PI/XI

Hello,
I am new to SAP XI. I have worked 3years as ABAP developer.
I do not know anything in Java. Please suggest the amount of java knowledge that I need to develop to become profound in SAP XI.Can anyone suggest any material that i can go thru to develop java skill that is required in SAP PI.
Regards,
HS

Hi,
As per the new releases and the past SAP PI/XI versions JAVA usage has been widely used in scenarios for Java Mapping , Adapter Module Development , UDFs and proxies.
So the basic knowledge of Java is sufficient since you already have a coding background. You need to understand few commonly used functions in UDFs and standard java APIs. Please find the links below which might be of your interests :
http://help.sap.com/saphelp_erp2004/helpdata/en/78/b4ea10263c404599ec6edabf59aa6c/frameset.htm
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/7d4db211-0d01-0010-1e8e-9b07fc2113ab?quicklink=index&overridelayout=true
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/c0b39e65-981e-2b10-1c9c-fc3f8e6747fa?quicklink=index&overridelayout=true
http://java.sun.com/j2se/1.4.2/docs/api/
Hope this will help you understand Java usage in SAP PI/XI and for core and basic Java knowledge you have lot of websites available.
Thanks & Regards,
Abhi

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