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Orbeon 3.7 on WLS 10 & clustering

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Nikola Radic

Orbeon 3.7 on WLS 10 & clustering

Hi,

For those running Orbeon 3.7 beta on WLS 10.3.0.0, the following snippet
should be added to the Orbeon/WEB-INF/weblogic.xml :
(related to the bug 308777 and message "java.lang.ClassCastException:
antlr.CommonAST")

<container-descriptor>
<prefer-web-inf-classes>true</prefer-web-inf-classes>
</container-descriptor>

Also, don't forget to select "I will make the deployment accessible from
the following location" in "Source accessibility" section.

I have though, one question, regarding clustering.

I tried the latest versions of Tomcat 5.x and 6.x, as well as WLS
10.3.0.0, using Apache ws in reverse proxy mode (also with JK module)
and I couldn't manage to
have Orbeon app clustered. When any of the nodes is down, at moment of
accessing another node, the following error occurs:

"Unable to retrieve XForms engine state. Please reload the current page.
Note that you will lose any unsaved changes. Static state key:
XXXXXXXXXX, dynamic state key: YYYYYYYYYYYY"

Does anyone have any clue where the problem can be?

Tnx in advance

nikola

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Erik Bruchez

Re: Orbeon 3.7 on WLS 10 & clustering

Administrator

> For those running Orbeon 3.7 beta on WLS 10.3.0.0, the following

> snippet should be added to the Orbeon/WEB-INF/weblogic.xml :
> (related to the bug 308777 and message
> "java.lang.ClassCastException: antlr.CommonAST")
>
>
> <container-descriptor>
> <prefer-web-inf-classes>true</prefer-web-inf-classes>
> </container-descriptor>
>
> Also, don't forget to select "I will make the deployment accessible
> from the following location" in "Source accessibility" section.

Thanks for sharing this!

> I have though, one question, regarding clustering.
>
> I tried the latest versions of Tomcat 5.x and 6.x, as well as WLS
> 10.3.0.0, using Apache ws in reverse proxy mode (also with JK
> module) and I couldn't manage to
> have Orbeon app clustered. When any of the nodes is down, at moment
> of accessing another node, the following error occurs:
>
> "Unable to retrieve XForms engine state. Please reload the current
> page. Note that you will lose any unsaved changes. Static state key:
> XXXXXXXXXX, dynamic state key: YYYYYYYYYYYY"
>
> Does anyone have any clue where the problem can be?

Orbeon Forms uses an XForms state store which is partly located in
memory, partly in eXist (when it overflows memory). If a node goes
down, that information probably disappears, so you get the error.

-Erik

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http://www.orbeon.com/

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