Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
I coded this today, just used the field instead of a setter method. Your
pseudo code was very helpful, thanks :-)
Maybe the following snippet is useful for someone with the same problem.
Should I post this on the wiki as well? I am not sure if it is a good
solution - but it works for me.
Can someone please tell me if it is ok to call this every time an action needs
the service, or would it be better to cache the service somewhere in
application scope? I am quite new to this whole ejb thing.
Piero
EJBInterceptor.java
public class EJBInterceptor extends AbstractInterceptor implements Interceptor
{
public String intercept(ActionInvocation actionInvocation) throws
Exception {
Object action = actionInvocation.getAction();
for (Field f : action.getClass().getDeclaredFields()) {
if (f.isAnnotationPresent(EJB.class)) {
f.setAccessible(true);
String serviceName = f.getType().getName();
Object service = null;
try {
InitialContext ic = new InitialContext();
service = ic.lookup(serviceName);
} catch (Exception ex) {
System.out.println(Error: +ex.getMessage());
}
f.set(action, f.getType().cast(service));
break;
}
}
return actionInvocation.invoke();
}
}
code
EJB.java
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
public @interface EJB {
}
- code
On Tuesday 23 January 2007 01:05:57 Ian Roughley wrote:
I can't provide the code - it is owned my a client. But here is the
pseudo code:
class EJB3Interceptor implements Interceptor {
public String intercept(ActionInvocation actionInvocation) throws
java.lang.Exception {
Object action = actionInvocation.getAction();
for all methods {
if( this is a setter and it is annotated as expected ) {
look up the EJB
set the EJB on the action
}
}
}
}
From here you would need to ensure that the interceptor is applied to
the actions that need ejb's.
-
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[s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
Hello I am trying to find a way of calling efficienlty from Struts Actions - SLSBs EJB3. I have made a question before. - Doing JNDI calls all the time through every action works though its a very primitive way of doing it. -Tried to implement the Service locator pattern though the semantics on EJB3 are different (how to cache Intefaces, which interfaces) I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency Injection for EJB3. Will Struts 2.0 support such a feature if NOT can anyone point me the mechanics so to (try) doing it on my own. I am bit stuck for days at this very point of efficiently glue-ing Struts and my EJB3 Business layer Any hint would be much appreciated! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
Currently there is no EJB3 support in Struts, however I have done this on a couple of projects. I used a custom annotation to mark action setters as ejb3 then a custom interceptor that looks for the annotation, looks up the ejb3 and injects it into the action. Doing it this way is less than a days work. Another option would be to replace the ObjectFactory (the class that does the dependency injection) with a a custom implementation that does EJB3 dependency injection. /Ian -- From Down Around, Inc. Innovative IT Solutions Software Architecture * Design * Development ~ web: www.fdar.com email [EMAIL PROTECTED] phone:617.821.5430 ~ papo wrote: Hello I am trying to find a way of calling efficienlty from Struts Actions - SLSBs EJB3. I have made a question before. - Doing JNDI calls all the time through every action works though its a very primitive way of doing it. -Tried to implement the Service locator pattern though the semantics on EJB3 are different (how to cache Intefaces, which interfaces) I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency Injection for EJB3. Will Struts 2.0 support such a feature if NOT can anyone point me the mechanics so to (try) doing it on my own. I am bit stuck for days at this very point of efficiently glue-ing Struts and my EJB3 Business layer Any hint would be much appreciated! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
Hi ! Ian, can you provide some kind of example source code to play with ? I'm interesting in Struts 2 and EJB 3 interoperability, but I can't figure out how to get started. Thanks ! On 1/22/07, Ian Roughley [EMAIL PROTECTED] wrote: Currently there is no EJB3 support in Struts, however I have done this on a couple of projects. I used a custom annotation to mark action setters as ejb3 then a custom interceptor that looks for the annotation, looks up the ejb3 and injects it into the action. Doing it this way is less than a days work. Another option would be to replace the ObjectFactory (the class that does the dependency injection) with a a custom implementation that does EJB3 dependency injection. /Ian -- From Down Around, Inc. Innovative IT Solutions Software Architecture * Design * Development ~ web: www.fdar.com email [EMAIL PROTECTED] phone:617.821.5430 ~ papo wrote: Hello I am trying to find a way of calling efficienlty from Struts Actions - SLSBs EJB3. I have made a question before. - Doing JNDI calls all the time through every action works though its a very primitive way of doing it. -Tried to implement the Service locator pattern though the semantics on EJB3 are different (how to cache Intefaces, which interfaces) I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency Injection for EJB3. Will Struts 2.0 support such a feature if NOT can anyone point me the mechanics so to (try) doing it on my own. I am bit stuck for days at this very point of efficiently glue-ing Struts and my EJB3 Business layer Any hint would be much appreciated! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
Hi again. Ian thank you for your reply. If I understood well, please pardon me...if it is wrong the following you said 1) implement your custom ejb3 annotations into struts ok I wonder the @EJB annotations are not going to work (I guess). I had a look @ some glassfish FAQ.. 2)Then implement Struts interceptors that are going to do the JNDI lookup?right? I have to admit I am bit confused My first attempt was to implement the classical ServiceLocator Pattern and stick it with delegates, though the pattern does not fit well with EJB3. Any hint from the Struts team ..is there any intention to implement that kind of support to Struts (Struts 2+ EJB3) integration? Or do you know any other extention project that is targeting this way..maybe we could contribute. At the moment this kind of problem does not make me fee confortable, I am a great Struts supporter(picked Struts as the web framework for our new j2ee web app) and its a pitty EJB3.0 is targeted towards either plain servlets or JSF for Dependency Injection etc etc. Any more hints if possible would be much appreciated! Thanks Stas Ostapenko wrote: Hi ! Ian, can you provide some kind of example source code to play with ? I'm interesting in Struts 2 and EJB 3 interoperability, but I can't figure out how to get started. Thanks ! On 1/22/07, Ian Roughley [EMAIL PROTECTED] wrote: Currently there is no EJB3 support in Struts, however I have done this on a couple of projects. I used a custom annotation to mark action setters as ejb3 then a custom interceptor that looks for the annotation, looks up the ejb3 and injects it into the action. Doing it this way is less than a days work. Another option would be to replace the ObjectFactory (the class that does the dependency injection) with a a custom implementation that does EJB3 dependency injection. /Ian -- From Down Around, Inc. Innovative IT Solutions Software Architecture * Design * Development ~ web: www.fdar.com email [EMAIL PROTECTED] phone:617.821.5430 ~ papo wrote: Hello I am trying to find a way of calling efficienlty from Struts Actions - SLSBs EJB3. I have made a question before. - Doing JNDI calls all the time through every action works though its a very primitive way of doing it. -Tried to implement the Service locator pattern though the semantics on EJB3 are different (how to cache Intefaces, which interfaces) I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency Injection for EJB3. Will Struts 2.0 support such a feature if NOT can anyone point me the mechanics so to (try) doing it on my own. I am bit stuck for days at this very point of efficiently glue-ing Struts and my EJB3 Business layer Any hint would be much appreciated! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
While I have not used it, the Spring Framework provides strategies for defining Spring Beans which are EJB factories (or something like that.) Struts 2 works quite nicely using Spring as the Action Factory, which can take care of resolving all Action dependencies whether or not they are EJBs. See http://cwiki.apache.org/S2PLUGINS/spring-plugin.html for more on using Spring as your object factory and this Spring documentation on EJBs: http://www.springframework.org/docs/reference/ejb.html Hope that helps. Joe On 1/22/07, Paris Apostolopoulos [EMAIL PROTECTED] wrote: Hi again. Ian thank you for your reply. If I understood well, please pardon me...if it is wrong the following you said 1) implement your custom ejb3 annotations into struts ok I wonder the @EJB annotations are not going to work (I guess). I had a look @ some glassfish FAQ.. 2)Then implement Struts interceptors that are going to do the JNDI lookup?right? I have to admit I am bit confused My first attempt was to implement the classical ServiceLocator Pattern and stick it with delegates, though the pattern does not fit well with EJB3. Any hint from the Struts team ..is there any intention to implement that kind of support to Struts (Struts 2+ EJB3) integration? Or do you know any other extention project that is targeting this way..maybe we could contribute. At the moment this kind of problem does not make me fee confortable, I am a great Struts supporter(picked Struts as the web framework for our new j2ee web app) and its a pitty EJB3.0 is targeted towards either plain servlets or JSF for Dependency Injection etc etc. Any more hints if possible would be much appreciated! Thanks Stas Ostapenko wrote: Hi ! Ian, can you provide some kind of example source code to play with ? I'm interesting in Struts 2 and EJB 3 interoperability, but I can't figure out how to get started. Thanks ! On 1/22/07, Ian Roughley [EMAIL PROTECTED] wrote: Currently there is no EJB3 support in Struts, however I have done this on a couple of projects. I used a custom annotation to mark action setters as ejb3 then a custom interceptor that looks for the annotation, looks up the ejb3 and injects it into the action. Doing it this way is less than a days work. Another option would be to replace the ObjectFactory (the class that does the dependency injection) with a a custom implementation that does EJB3 dependency injection. /Ian -- From Down Around, Inc. Innovative IT Solutions Software Architecture * Design * Development ~ web: www.fdar.com email [EMAIL PROTECTED] phone:617.821.5430 ~ papo wrote: Hello I am trying to find a way of calling efficienlty from Struts Actions - SLSBs EJB3. I have made a question before. - Doing JNDI calls all the time through every action works though its a very primitive way of doing it. -Tried to implement the Service locator pattern though the semantics on EJB3 are different (how to cache Intefaces, which interfaces) I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency Injection for EJB3. Will Struts 2.0 support such a feature if NOT can anyone point me the mechanics so to (try) doing it on my own. I am bit stuck for days at this very point of efficiently glue-ing Struts and my EJB3 Business layer Any hint would be much appreciated! - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Joe Germuska [EMAIL PROTECTED] * http://blog.germuska.com The truth is that we learned from João forever to be out of tune. -- Caetano Veloso
RE: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
I've never used it either but I know from other peoples experience that it
works great for EJB 2.1.
I don't know how good it supports Ejb 3 though but you can always ask at
http://forum.springframework.org/forumdisplay.php?f=29.
Cheers,
Peter
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Joe
Germuska
Sent: den 22 januari 2007 15:47
To: Struts Users Mailing List
Subject: Re: [s2] Struts Dependency Injection and EJB3 - support ? or how
can i Do it?
While I have not used it, the Spring Framework provides strategies for
defining Spring Beans which are EJB factories (or something like that.)
Struts 2 works quite nicely using Spring as the Action Factory, which can
take care of resolving all Action dependencies whether or not they are EJBs.
See
http://cwiki.apache.org/S2PLUGINS/spring-plugin.html
for more on using Spring as your object factory
and this Spring documentation on EJBs:
http://www.springframework.org/docs/reference/ejb.html
Hope that helps.
Joe
On 1/22/07, Paris Apostolopoulos [EMAIL PROTECTED] wrote:
Hi again.
Ian thank you for your reply.
If I understood well, please pardon me...if it is wrong the following
you said
1) implement your custom ejb3 annotations into struts ok I wonder the
@EJB annotations are not going to work (I guess). I had a look @ some
glassfish FAQ..
2)Then implement Struts interceptors that are going to do the JNDI
lookup?right?
I have to admit I am bit confused
My first attempt was to implement the classical ServiceLocator Pattern
and stick it with delegates, though the pattern does not fit well with
EJB3.
Any hint from the Struts team ..is there any intention to implement
that kind of support to Struts (Struts 2+ EJB3) integration? Or do you
know any other extention project that is targeting this way..maybe we
could contribute.
At the moment this kind of problem does not make me fee confortable, I
am a great Struts supporter(picked Struts as the web framework for our
new j2ee web app) and its a pitty EJB3.0 is targeted towards either
plain servlets or JSF for Dependency Injection etc etc.
Any more hints if possible would be much appreciated!
Thanks
Stas Ostapenko wrote:
Hi !
Ian, can you provide some kind of example source code to play with ?
I'm interesting in Struts 2 and EJB 3 interoperability, but I can't
figure out how to get started. Thanks !
On 1/22/07, Ian Roughley [EMAIL PROTECTED] wrote:
Currently there is no EJB3 support in Struts, however I have done
this on a couple of projects. I used a custom annotation to mark
action setters as ejb3 then a custom interceptor that looks for the
annotation,
looks up the ejb3 and injects it into the action. Doing it this
way is less than a days work.
Another option would be to replace the ObjectFactory (the class
that does the dependency injection) with a a custom implementation
that does
EJB3 dependency injection.
/Ian
--
From Down Around, Inc.
Innovative IT Solutions
Software Architecture * Design * Development
~
web: www.fdar.com
email [EMAIL PROTECTED]
phone:617.821.5430
~
papo wrote:
Hello
I am trying to find a way of calling efficienlty from Struts
Actions
- SLSBs EJB3. I have made a question before.
- Doing JNDI calls all the time through every action works though
its a very primitive way of doing it.
-Tried to implement the Service locator pattern though the
semantics on EJB3 are different (how to cache Intefaces, which
interfaces)
I know tha EJB3 on the web layer Serlvets/ JSF supports
Dependency Injection for EJB3.
Will Struts 2.0 support such a feature if NOT can anyone point me
the mechanics so to (try) doing it on my own.
I am bit stuck for days at this very point of efficiently
glue-ing Struts and my EJB3 Business layer
Any hint would be much appreciated!
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---
-- To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
- To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
--
Joe Germuska
[EMAIL PROTECTED] * http://blog.germuska.com
The truth is that we learned from João forever to be out of tune.
-- Caetano Veloso
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
On 1/22/07, Paris Apostolopoulos [EMAIL PROTECTED] wrote: [snip] I wonder the @EJB annotations are not going to work (I guess). I had a look @ some glassfish FAQ.. The standard annotations for Java EE 5 resource injection are indeed *not* going to work on a Struts action, because they only work on container-created objects (servlets, filters, listeners, and JSF managed beans). You'll want to look at a custom interceptor solution (as described in this thread), continuing to use JNDI lookups, or perhaps using an alternative resource injection framework like Spring. Craig
Re: [s2] Struts Dependency Injection and EJB3 - support ? or how can i Do it?
I can't provide the code - it is owned my a client. But here is the
pseudo code:
class EJB3Interceptor implements Interceptor {
public String intercept(ActionInvocation actionInvocation) throws
java.lang.Exception {
Object action = actionInvocation.getAction();
for all methods {
if( this is a setter and it is annotated as expected ) {
look up the EJB
set the EJB on the action
}
}
}
}
From here you would need to ensure that the interceptor is applied to
the actions that need ejb's.
--
From Down Around, Inc.
Innovative IT Solutions
Software Architecture * Design * Development
~
web: www.fdar.com
email [EMAIL PROTECTED]
phone:617.821.5430
~
Paris Apostolopoulos wrote:
Hi again.
Ian thank you for your reply.
If I understood well, please pardon me...if it is wrong the following
you said
1) implement your custom ejb3 annotations into struts ok
I wonder the @EJB annotations are not going to work (I guess). I had a
look @ some glassfish FAQ..
2)Then implement Struts interceptors that are going to do the JNDI
lookup?right?
I have to admit I am bit confused
My first attempt was to implement the classical ServiceLocator Pattern
and stick it with delegates, though the pattern does not fit well with
EJB3.
Any hint from the Struts team ..is there any intention to implement
that kind of support to Struts (Struts 2+ EJB3) integration? Or do you
know any other extention project that is targeting this way..maybe we
could contribute.
At the moment this kind of problem does not make me fee confortable, I
am a great Struts supporter(picked Struts as the web framework for our
new j2ee web app) and its a pitty EJB3.0 is targeted towards either
plain servlets or JSF for Dependency Injection etc etc.
Any more hints if possible would be much appreciated!
Thanks
Stas Ostapenko wrote:
Hi !
Ian, can you provide some kind of example source code to play with ?
I'm interesting in Struts 2 and EJB 3 interoperability, but I can't
figure out how to get started. Thanks !
On 1/22/07, Ian Roughley [EMAIL PROTECTED] wrote:
Currently there is no EJB3 support in Struts, however I have done this
on a couple of projects. I used a custom annotation to mark action
setters as ejb3 then a custom interceptor that looks for the
annotation,
looks up the ejb3 and injects it into the action. Doing it this way is
less than a days work.
Another option would be to replace the ObjectFactory (the class that
does the dependency injection) with a a custom implementation that does
EJB3 dependency injection.
/Ian
--
From Down Around, Inc.
Innovative IT Solutions
Software Architecture * Design * Development
~
web: www.fdar.com
email [EMAIL PROTECTED]
phone:617.821.5430
~
papo wrote:
Hello
I am trying to find a way of calling efficienlty from Struts Actions
- SLSBs EJB3. I have made a question before.
- Doing JNDI calls all the time through every action works though its
a very primitive way of doing it.
-Tried to implement the Service locator pattern though the semantics
on EJB3 are different (how to cache Intefaces, which interfaces)
I know tha EJB3 on the web layer Serlvets/ JSF supports Dependency
Injection for EJB3.
Will Struts 2.0 support such a feature if NOT can anyone point me the
mechanics so to (try) doing it on my own.
I am bit stuck for days at this very point of efficiently glue-ing
Struts and my EJB3 Business layer
Any hint would be much appreciated!
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
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To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
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For additional commands, e-mail: [EMAIL PROTECTED]
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