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Struts 2 Actions having Transaction Management capabilities(calling 2 or more Service Layers)

 
Greenhorn
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Hi All

I am implementing my app very similar to this tutorial at http://struts.apache.org/2.0.14/docs/struts-2-spring-2-jpa-ajax.html

Some of my action classes attempt to persist data into 2 or more tables(i.e: 2 or more spring beans declared in the applicationContext.xml)
My applicationContext.xml is pretty much the exact same as that tutorial:



My issue is that I sometimes need 1 action class to invoke and update data in 2 or more tables.
Example from above. userAdministrationAction has a save() which will update the projectServiceImpl & userProjectServiceImpl beans by calling there respective service layers.


I need to find out how to do 2 things:

1) Since the save() in the userAdministrationAction calls 2 different service layers, how can I put this save() in a transaction? So that if the call to the 2nd service layers fails, it will roll back the call to the first service layer? I have researced all over the web and i cant seem to figure it out. The example I mentioned above at that URL does not have this scenario.

My userAdministrationServiceImpl class is transactional(spring will make sure its methods runs inside a transaction). However, since its the action that calls these service methods, the action itself is not in a transaction.

How can I implement this?

2) When an action calls multiple services, I used the shared entity manager to ensure its set on the services before calling the services methods. I have a feeling I am doing this incorrectly at the moment. What I currently do is as follows:

In userAdministrationAction:



If I do not implement the line above, and try and access methods in other services, I get a null pointer exception. This happens because the EntityManager is null.

Is there a better way of doing this than what I am doing at the moment?


I would appreicate help in those 2 questions. It would really help me move on considerably as I am stuck at the moment.

kind regards

Mick
 
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Please UseCodeTags when posting code or configuration. Unformatted code and configuration is very difficult to read. You can edit your post to include them by using the button.
 
David Newton
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This isn't really Struts-related, since the underlying technology isn't relevant.

In any case, I (almost) always do this by creating a composite service and using JTA to nest transactions. Another option is to make an additional service that calls non-transactional operations and put the new service's call under a single transaction.

I'm moving this to... Spring?
 
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Mick, did you ever find a solution to your problem?
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