OSB10gR3:High-availbility of file protocol based proxy service

Hi All,
I just want to know the options available for creating two proxy services polling on the same location using File transport/ making a file based proxy service independent of managed servers.
Actually in OSB doc's File Transport Configuration page, it is mentioned that
Managed Server This field is available only in a clustered domain. Select the Managed Server to act as the polling server. All of the Managed Servers can process the message, but only one can poll for the message. ( [Click here|http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/consolehelp/proxyservices.html#wp1272642] to check)
So what if the server on which proxy is deployed for polling, goes down? How can we handle such situation?
Your opinion?
Thanks & Regards,
Anuj

File like FTP and Email transports are singleton services. That is, the processing can take place in any node of the cluster, but the polling only takes place in one. The reason for this is simple, duplicate invocations. If you have 4 nodes in your cluster and they are all polling, when a new file is created, your proxy could be invoked 4 times for the same file.
You could make two proxy services and have them poll the same directory but on different nodes. If the nodes share the same file system, your business service would have to be able to deal with duplicate messages. If it's not the same file system, the application that creates the files would need to keep track of the status of the servers in the cluster to decide where to put the files.
I think the best option would be to look into weblogic's cluster features: leasing and server migration. You could configure weblogic to automatically migrate the failed server to another machine (there's also service migration, but I don't think weblogic is aware of osb level services). Of course you would need to use a file system that's available to both the "primary" and the "backup" servers. Have a look here:
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/cluster/migration.html
You could also create a WLST script to modify your proxy service (change the managed server) in case of failure. There should be a way, maybe through JMX or using the WLDF, to get a notification when the server goes down so you can execute your script. Again, you need a shared file system.
Hope that helps. And if you come up with a good solution let us know!

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Edited by: 4dyomi on Nov 20, 2009 11:42 AM

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Edited by: user12883209 on Jan 5, 2012 5:29 AM

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http://docs.oracle.com/cd/E21764_01/doc.1111/e15867/interop.htm#OSBAG1403
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Edited by premkumr at 10/31/2007 3:26 PM

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This [url http://www.javaworld.com/javaforums/showflat.php?Cat=&Board=Enterprisejava&Number=3801&page=12&view=collapsed&sb=9&o=&fpart=1]chap seemed to have a similar problem to you and solved it by adding the jaxprc-spi jar file to his class path. It may be that the jaxrpc-impl is causing you greif.
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www.orbism.com

Creating the proxy service

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Hi,
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Cannot create Proxy service with JCA transport

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I have some issues while trying to create ftp service with jca transport. I follow the instruction in this tutorial:
http://blogs.oracle.com/MarkSmith/entry/osb_and_ftp_adapter_in_11g
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Invalid JCA file for JCA proxy service. If you are creating a Proxy from a Business Service, please select a different transport type (for example, http). If not, JCA file must contain JCA activation spec properties.And these are my jca file content that created by JDeveloper:
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Any response is appreciated
Regards, Cuong Pham

To get to the basics.
You use GET to read files from an FTP location - This can be done by an OSB proxy service only.
You use PUT to write files to an FTP location - This can be done by an OSB business service only.
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OSB10gR3:High-availbility of file protocol based proxy service

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