|Re: Separate project trouble [message #666100 is a reply to message #665658]
||Tue, 19 April 2011 07:06
| Neikius Mising name
Registered: April 2011
I got this weird error |
javax.servlet.ServletException: Exception [EclipseLink-4021] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Unable to acquire a connection from driver [null], user [null] and URL [null]. Verify that you have set the expected driver class and URL. Check your login, persistence.xml or sessions.xml resource. The jdbc.driver property should be set to a class that is compatible with your database platform
but then I somehow managed to punch through in a test project no.2... I guess its all about the settings. And the finese must play a large part too, so its not really all that friendly for someone trying for the first time.
I can get something to work, add a few things and I have to retrace and retry a few times to get even the most basic programs through.
So I will take your advice:
1) Always JTA, I guess I botched at jumping to more advanced ways of managing persistence context, gone back to the roots and it works now.
2) Still have trouble here though, for now I have persistence.xml in ejb bean, can I just put it into the jpa utility jar? It was my original intention to do this, but do I have to export the jar and include it? I was thinking of just referencing the jpa project under java build path of the ejb project. Om, seems to work now too, at least in my test project. And I don't have a clue how since I've been doing much the same thing for a while now. I guess I will have to figure this out.
3) Ye, this solved it for me. Not that my project was much more complex, but I guess @PersistenceContext is simpler than @Injecting produced EntityManager, though that should still works simply from what I gather...
Thanks for now, hope I can start with this finally.
edit: Om, I still cannot debug the main project. If I set a breakpoint in EJB it gets hit but I cannot step by step the execution after that... any clues regarding this?
edit2: So, any ideas why do I randomly get that null null errors? Then I just refresh a few times and a few of them it works and a few I get nulls... (nulls to datasource? what?)
[Updated on: Wed, 20 April 2011 08:41]
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