Using remote EJB by annotation

[abednarski]

Hi,

My scenario is:

a) jboss server A (ip a.a.a.a) - client - application wants to access through annotation (inject and execute method) on ejb located on other server

b) jboss server B (ip b.b.b.b) - ejb - other server containing ejb which I want to access


Where:

a) jboss server A ip address is a.a.a.a and name dns name is jbossa

b) jboss server B ip address is b.b.b.b and name dns name is jbossb


I was trying to follow this article: http://www.mastertheboss.com/en/jboss-application-server/49-jboss-ejb3-in-a-cluster.html part: "
How can a remote client access a clustered EJB ?" but I don't want to cluster 2 jboss servers

I added to jboss server A in ...jboss/server/default/conf/jndi.properties new line (none of them allowed to pass my scenario):

a) java.naming.provider.url=jbossb:1099
b) java.naming.provider.url=jnp://b.b.b.b:1099
c) java.naming.provider.url=jbossa:1099,jbossb:1099
d) java.naming.provider.url=jnp://a.a.a.a:1099,jnp://b.b.b.b:1099

and according to article I should add @Clustered but I did not (I don't want to use cluster).

When I'm trying to inject EJB in client on jboss server A I got typical exception "MyBean is not bound".

My questions:

1) Is it possible to access remote EJB using annotation without clustering jboss servers ?

2) Is it possible to use access EJB using annotation clustering jboss servers?

3) Is clustering only option to access remote EJB when using annotation?

4) What is the overhead when two jboss servers are clustered?

5) Is it possible to setup clustering in a way that it will only support using remote ejb without other functionality (to limit overhead)?

Regards,
Adam.

[csorbag]

I'm not sure what you mean by client. As I understand you have 2 EJBs on different servers, and one calls the other one, right?

I think one option is to use external context as described in
http://www.jboss.org/file-access/default/members/jbossas/freezone/docs/Server_Configuration_Guide/4/html/Additional_Naming_MBeans-org.jboss.naming.ExternalContext_MBean.html. I have not tried that with annotations but it should work.

[henk53]

csorbag wrote:

I'm not sure what you mean by client. As I understand you have 2 EJBs on different servers, and one calls the other one, right?

I think one option is to use external context as described in
http://www.jboss.org/file-access/default/members/jbossas/freezone/docs/Server_Configuration_Guide/4/html/Additional_Naming_MBeans-org.jboss.naming.ExternalContext_MBean.html. I have not tried that with annotations but it should work.

Just wondering, as it seems documentation for this particular MBean seems to be purged from all JBoss AS 5 documentation. The bean does seem to exist in JBoss AS 5: http://www.docjar.com/docs/api/org/jboss/naming/ExternalContextMBean.html .

I searched the following guides:

https://community.jboss.org/wiki/JBossAS5InstallationandGettingStartedGuide

https://community.jboss.org/wiki/JBossAS5AdministrationandConfigurationGuide

https://community.jboss.org/wiki/JBossAS5ClusteringGuide

But there's simply nothing about this MBean there. Has this MBean been deprecated? Is there a new way to do this in JBoss AS 5.x?

[henk53]

Nobody has an answer to this question?

[jaikiran]

I don't have much idea about that MBean. Also, this doesn't look like a EJB3 question. I'll move this to our AS user forum, where someone who knows about this might help.

[henk53]

Ok, thanks!

[henk53]

Anyone?

[henk53]

Is there really nobody who knows the answer to this question?

Guys, what's the idea of stating that you move away from MBeans, while everything keeps using MBeans and there is no information available on how to do the same with POJOs in JBoss AS 5?

If I buy support for JBoss, will 'they' then be able to answer this question? Is this even something anyone knows? Or has this particular MBean been development by someone who long ago left JBoss and is forgotten to be assigned to a new developer/maintainer?

[henk53]

Just wondering, for JBoss AS 6, will we need to keep looking up the documentation for this MBean in the JBoss AS 4 documentation? Wouldn't that be a bit awkward, especially for new users?

[henk53]

Guys,

What's the deal with this question?

Why does nobody answer this? Doesn't anyone care about this? Should I crosspost this to some other forum? Should I rephrase the question?

[jaikiran]

henk de boer wrote:

Is there really nobody who knows the answer to this question?

Like I said in one of my previous reply, I haven't looked at that MBean to know anything about it. But given that you have been asking this for some time now, here's what I think:

henk de boer wrote:

If I buy support for JBoss, will 'they' then be able to answer this question?

Yes. They would. After all that's what paid support means - you are paying to get your questions answered in a timely manner without you having to dig into code/documentation/forums for the answers yourself.

henk de boer wrote:

Is this even something anyone knows?

Maybe someone knows and hasn't seen this question.

Anyway, if I were you and if I wanted a functionality which this MBean supposedly provides, I would first try it out against AS5 and if I run into any issues, then would create some specific forum threads to discuss those issues. It's no secret that the AS5 documentation doesn't cover all of the MBeans/POJOs out there. Furthermore, if you get things working with that MBean, you could even create a wiki with the details.

P.S: I'm not blaming you for asking the question about documentation. I'm just pointing out that you can easily give it a try and then come up with any specific issues which someone here might be able to help with. Infact, if I find some time soon, I'll see if I can look into the details of that MBean (but I can't promise).

[jaikiran]

Just a FYI - A user just got this MBean working for him on JBoss AS6 http://community.jboss.org/message/595480#595480

[atijms]

Thanks for the follow up Jaikiran!

Additionally, documentation of the bean is now in the 5.1 documentation:

http://docs.redhat.com/docs/en-US/JBoss_Enterprise_Web_Platform/5/html/Administration_And_Configuration_Guide/Additional_Naming_MBeans-org.jboss.naming.ExternalContext_MBean.html

[henk53]

Just wondering, is there anything like this in JBoss AS 7?

[jaikiran]

If you mean the ExternalContextMBean, then no it's not in AS7.

However, if you want to be able to inject a bean which is also deployed on some other server and have the invocations forwarded to the other server, it should be possible in AS7. I'm going to write up some documentation for that and it's related to this thread https://community.jboss.org/thread/177237?tstart=30