Spring-Hibernate应用程序与EJB-Hibernate应用程序集成？

Question

I have a EJB-Hibernate application, and currently I am trying to integrate another application which is built in Spring-Hibernate .

Now the issue is, as both of them are using Hibernate, I am confused how to integrate their hibernate configs?

Again both of them use different way of writing Hibernate configs also, ie Spring based app uses through Spring beans and hibernate-cfg.properties file,

Whereas EJB application is doing it, a standard hibernate way (ie xxx-cfg.xml and xxx-hbm.xml),

So I am confused, what should be my approach? Any help is welcome.

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Sorry I forgot to mention Versions -->

In EJB Application --> EJB 2.0 and Hibernate 3.1.3 & Spring Application, Spring 3.x and Hibernate 3.2.6

And in Spring-Hibernate Application they have their own cache implementation, currently both are referring to separate datasources and separate Db-schemas.

I want to integrate them so that, both will have same db-schema (I will do that by merging their schemas ie adding tables,etc. to current schema) and same datasource (Here we are using JBoss to manage datasource connections through xxx-ds.xml)

EJB-Hibernate Application we have mentioned the JNDI name of this datasource, so it refers to that. But in Spring App, they are having their separate datasource, but I can make it reference same using same JNDI name.

Please tell me, how should I do this integration?

Answer 1

Your information seems to be a bit confusing but I would try to gather from what you have mentioned.

When you say that you want to intergrate both applications, then apart from using a common datasource are you trying to get rid of EJB 2 in your application and use Spring instead ? This will require migration from EJB2 to Spring. For this there are plenty of articles like this one.

Or if what you want is that both the applications should exists independently but should use single schema then as you stated you can merge both schemas into one, register the datasource in JNDI. Then use can use the same datasource in both different applications. EJB2 and Spring both can use a JNDI bound datasource.

In case both applications exist independently and one of them is using hibernate second level cache ( as you mentioned) then you will have to be careful as your cache will be invalidated very often as your database will be shared between two application which can write to database. In fact in such cases it's wise only to cache ONLY read-only data which never changes.