The description of your problem indeed reminds me of the same problem I had before. I think I probably had the same one when I used the 8.x version but don’t remember the exact version number. In my case, it, of course had nothing to do with the instruction above. It just happened one day when I turned on my PC. I didn’t do anything special that time nor did I have any idea how to solve it so re-installed the Ubuntu.

I obviously didn’t want to lose the important data so used Ubuntu Live CD to boot then copied the data to another partition and finally re-installed it. If your problem keeps happening and you can’t find any solution, I suggest using Live CD and restore the settings you have changed. Then you can see if the changes you made caused the problem. Good luck!

It seems the EntityManager injection has failed due to some problem in the DAO.
Since I don’t have your source code, can’t tell exactly what causes the problem. If it’s OK with you and if you want me to have a look, could you put your code of AbstractGenericDao and CommuneDaoImpl?

You can use [code lang=”java”]Put your code here[/code] to get the code syntax highlighted.

Regards,
Kevin

But i have a problem I get java.lang.IllegalStateException: EntityManager is not injected.
WARN – Injection: No such property ‘ejbtest.AbstractGenericDao/entityManager’ in class ejbtest.CommuneDaoImpl

Jeff

JSR-181 uses annotations which were introduced in J2SE 5.0 so with just J2EE 1.4, you cannot use JSR-181.

I don’t know why you put that comment, which is completely irrelevant to the post, here. Well, your comment has nothing to do with my blog entry although it has the word, ‘web service’. I believe you are probably a spam bot as I found that your homepage URI linked to some product list in some on-line shopping mall. Thus I removed it.

properties
property name=”hibernate.dialect” value=”org.hibernate.dialect.SQLServerDialect” /
/properties

Thanks again!

If you have an error like ‘Name MyServlet is not bound in this Context’, you normally need to check if the servlet is correctly set in the web.xml, the deployment descriptor.

Yet your case seems different. That error may also be caused by the failure in EJB injection if you use EJB. So the problem is not in the servlet yet in the EJB you try to inject in the servlet.

Let me explain with an example.

You have an EJB, named TestService and your servlet that is MyServlet has TestService as a member field.

So it would be like:
@EJB
private TestService testService;

When the application is deployed, the EJB container that is in this post, OpenEJB instantiates the TestService EJB then tries to inject it into the TestService field in the servlet. However, if the TestService EJB has any problem so OpenEJB fails to instantiate it then the TestService EJB cannot be injected into the member field in the servlet. So it also causes the problem in instantiation of the servlet. Thus after all, you can get that error message saying ‘Servlet is not bound in this Context’ yet the actual problem lies in the EJB. That’s why your servlet has no problem when you comment out the @EJB annotation. Although the servlet is fine without the @EJB annotation, as you said, you don’t have EJBs without it. Therefore you need to check your EJBs to solve the problem. If the EJBs injected in the servlet use other EJBs then you should make sure all the EJBs have no problems.

For instance, let’s assume that your stateless EJBs use a DAO which is also a stateless EJB and the DAO has the EntityManager field which is annotated with the @PersistenceContext annotation. When the application is deployed, the OpenEJB tries to inject the EntityManager object into the field. In this step, if your persistence.xml has any problems or any other problems occur, the OpenEJB fails to inject EntityManager in the DAO and therefore, the DAO cannot be instantiated which consecutively causes the failures in the EJB injections of other EJBs which use the DAO.

So as I already mentioned, you need to carefully check the EJBs.
I hope it might help you.

Regards,
Kevin

Thanks for a good “how-to”!
I have followed your instructions but when I try to go to the Servlet I get this error :
1) Error instantiating servlet class MyServlet
2) ‘Name MyServlet is not bound in this Context’

where MyServlet is like your TestServlet in current example…. I realy cant figure it out and would be very glad if anyone could point me in right direction.

Thanks in advance!