How do you access a GBean via JNDI?

[Juergen Weber <we...@gmail.com>]

Hi,

right now I access a GBean from a servlet using (is that the correct way?)

Kernel kernel = KernelRegistry.getSingleKernel();
URI uri = new URI(myuri);
AbstractName gBeanAN = new AbstractName(uri);
retVal = kernel.invoke(gBeanAN,"myMethod",args,paramTypes);
       
with myuri from the abstractName field of the GBean in JMX Viewer in
Console, which is quite a long uri.
Also you need Geronimo-specific code in a JEE application.

So I tried to bind the GBean into JNDI as suggested in
http://www.nabble.com/How-to-get-hold-of-a-WorkManager-in-a-web-app--td21400861s134.html

<gbean name="...BeanBinding"
class="org.apache.geronimo.gjndi.binding.GBeanBinding">
        <attribute name="name">...</attribute>
        <attribute name="abstractNameQuery">?name=MyJNIGBean#</attribute>
        <reference name="Context">
            <name>JavaContext</name>
        </reference>
    </gbean>

but then I get Classnotfound for GBeanBinding. How do you specify a
dependency for this class?
and what is the abstractNameQuery for the GBean? the full AbstractName ?

Thanks,
Juergen
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Re: How do you access a GBean via JNDI?

[David Jencks <da...@yahoo.com>]

On Jan 23, 2009, at 1:47 AM, Juergen Weber wrote:

>
> Hi,
>
> right now I access a GBean from a servlet using (is that the correct  
> way?)
>
> Kernel kernel = KernelRegistry.getSingleKernel();
> URI uri = new URI(myuri);
> AbstractName gBeanAN = new AbstractName(uri);
> retVal = kernel.invoke(gBeanAN,"myMethod",args,paramTypes);
>
> with myuri from the abstractName field of the GBean in JMX Viewer in
> Console, which is quite a long uri.
> Also you need Geronimo-specific code in a JEE application.
>
> So I tried to bind the GBean into JNDI as suggested in
> http://www.nabble.com/How-to-get-hold-of-a-WorkManager-in-a-web-app--td21400861s134.html
>
> <gbean name="...BeanBinding"
> class="org.apache.geronimo.gjndi.binding.GBeanBinding">
>        <attribute name="name">...</attribute>
>        <attribute name="abstractNameQuery">?name=MyJNIGBean#</ 
> attribute>
>        <reference name="Context">
>            <name>JavaContext</name>
>        </reference>
>    </gbean>
>
> but then I get Classnotfound for GBeanBinding. How do you specify a
> dependency for this class?

If this gbean is declared in a javaee app the GBeanBinding class  
should be available already.  Otherwise...

<groupId>org.apache.geronimo.framework</groupId>
<artifactId>rmi-naming</artifactId>
<type>car</type>

>
> and what is the abstractNameQuery for the GBean? the full  
> AbstractName ?

The full name will definitely work but is usually overkill.  Enough to  
uniquely identify the gbean is sufficient; this will usually be the  
name component of the map part of the abstract name, as in the example  
above.  You can also use an interface implemented by your gbean after  
the #.

There's another approach, which gets your gbean in the java:comp/env  
namespace...  I'll try to find time to document it better but you  
include a gbean-ref element in your geronimo javaee app plan with the  
other naming stuff...

see the geronimo-naming-1.2.xsd which ought to be in the /schemas  
directory and the  
org.apache.geronimo.naming.deployment.GBeanRefBuilder class.

In either case its a really good idea if not essential to make sure  
the plugin or module that contains the gbean you are looking up is the  
same as or an ancestor of the app that is looking it up so you are  
certain it has started before you try to use it.

thanks
david jencks
>
>
> Thanks,
> Juergen
> -- 
> View this message in context: http://www.nabble.com/How-do-you-access-a-GBean-via-JNDI--tp21621410s134p21621410.html
> Sent from the Apache Geronimo - Users mailing list archive at  
> Nabble.com.
>