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Posted to user@geronimo.apache.org by Olaf Bergner <ol...@saxsys.de> on 2009/03/13 14:28:17 UTC
Problem accessing JNDI resources from inside custom resource
adapter
I'm trying to deploy a Spring context as a custom resource adapter using
Spring's
http://static.springframework.org/spring/docs/2.5.x/api/org/springframework/jca/context/SpringContextResourceAdapter.html
SpringContextResourceAdapter . From inside the deployed Spring context, I'm
trying to access a JMS queue using
<jee:jndi-lookup id="myQueue" jndi-name="jms/MyQueue"/>,
i.e. using Spring's JNDI support.
This however fails with a message to the effect (I'm currently at work and
may provide more detailed information later) that I'm trying to access the
JNDI context from a thread that hasn't yet initialized it. This message is
wrapped in an NPE thrown when
RootContext.getContext()
returns null.
Could anyone in the know tell me what I'm doing wrong?
Thx,
Olaf
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Re: Problem accessing JNDI resources from inside custom resource
adapter
Posted by Olaf Bergner <ol...@saxsys.de>.
David, thanks for your comprehensive and helpful reply. My choice of using a
rar as my deployment unit is mainly motivated by my need to start my own
threads. I therefore figured that using the JEE work manager API would be
the most standards compliant way to do so. Yet I suspect that in practice
nothing would keep me from accessing Geronimo's work manager from a SLSB.
Thx,
Olaf
djencks wrote:
>
>
> On Mar 13, 2009, at 6:28 AM, Olaf Bergner wrote:
>
>>
>> I'm trying to deploy a Spring context as a custom resource adapter
>> using
>> Spring's
>> http://static.springframework.org/spring/docs/2.5.x/api/org/springframework/jca/context/SpringContextResourceAdapter.html
>> SpringContextResourceAdapter . From inside the deployed Spring
>> context, I'm
>> trying to access a JMS queue using
>>
>> <jee:jndi-lookup id="myQueue" jndi-name="jms/MyQueue"/>,
>>
>> i.e. using Spring's JNDI support.
>>
>> This however fails with a message to the effect (I'm currently at
>> work and
>> may provide more detailed information later) that I'm trying to
>> access the
>> JNDI context from a thread that hasn't yet initialized it. This
>> message is
>> wrapped in an NPE thrown when
>>
>> RootContext.getContext()
>>
>> returns null.
>>
>> Could anyone in the know tell me what I'm doing wrong?
>
>
> I'd guess that for reasons of its own spring is looking up something
> in the java:comp jndi context. This is not defined nor guaranteed to
> be available in a resource adapter. If you call the resource adapter
> from a thread that has gone through a javaEE component, in geronimo
> you will get the java:comp context of that component.
>
> If you really need to package your code as a resource adapter you
> probably need to use the global jndi context. See
> http://cwiki.apache.org/GMOxDOC21/jndi.html
> (I can't find this in the 2.2 docs) I don't know how you would get
> spring to look here.
>
> However, I can't imagine a scenario in which packaging your code as a
> resource adapter makes any sense. In all the scenarios I can imagine
> you would get much better results using SSB ejbs. Generally you only
> want to write a resource adapter if your code is actually connecting
> to a remote resource manager. Since you are trying to look up a jms
> queue from another resource adapter it seems that at least much of
> your code is not doing this.
>
> thanks
> david jencks
>
>>
>>
>> Thx,
>> Olaf
>> --
>> View this message in context:
>> http://www.nabble.com/Problem-accessing-JNDI-resources-from-inside-custom-resource-adapter-tp22496418s134p22496418.html
>> Sent from the Apache Geronimo - Users mailing list archive at
>> Nabble.com.
>>
>
>
>
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Re: Problem accessing JNDI resources from inside custom resource adapter
Posted by David Jencks <da...@yahoo.com>.
On Mar 13, 2009, at 6:28 AM, Olaf Bergner wrote:
>
> I'm trying to deploy a Spring context as a custom resource adapter
> using
> Spring's
> http://static.springframework.org/spring/docs/2.5.x/api/org/springframework/jca/context/SpringContextResourceAdapter.html
> SpringContextResourceAdapter . From inside the deployed Spring
> context, I'm
> trying to access a JMS queue using
>
> <jee:jndi-lookup id="myQueue" jndi-name="jms/MyQueue"/>,
>
> i.e. using Spring's JNDI support.
>
> This however fails with a message to the effect (I'm currently at
> work and
> may provide more detailed information later) that I'm trying to
> access the
> JNDI context from a thread that hasn't yet initialized it. This
> message is
> wrapped in an NPE thrown when
>
> RootContext.getContext()
>
> returns null.
>
> Could anyone in the know tell me what I'm doing wrong?
I'd guess that for reasons of its own spring is looking up something
in the java:comp jndi context. This is not defined nor guaranteed to
be available in a resource adapter. If you call the resource adapter
from a thread that has gone through a javaEE component, in geronimo
you will get the java:comp context of that component.
If you really need to package your code as a resource adapter you
probably need to use the global jndi context. See http://cwiki.apache.org/GMOxDOC21/jndi.html
(I can't find this in the 2.2 docs) I don't know how you would get
spring to look here.
However, I can't imagine a scenario in which packaging your code as a
resource adapter makes any sense. In all the scenarios I can imagine
you would get much better results using SSB ejbs. Generally you only
want to write a resource adapter if your code is actually connecting
to a remote resource manager. Since you are trying to look up a jms
queue from another resource adapter it seems that at least much of
your code is not doing this.
thanks
david jencks
>
>
> Thx,
> Olaf
> --
> View this message in context: http://www.nabble.com/Problem-accessing-JNDI-resources-from-inside-custom-resource-adapter-tp22496418s134p22496418.html
> Sent from the Apache Geronimo - Users mailing list archive at
> Nabble.com.
>