How to inject EntityManager in non-EJB based WebService?

Hi,
I want to know how we can inject EntityManager in non-EJB based WebService?
Regards,
imran

I think the way to go would be to actually do use an EJB for the persistence stuff and use that EJB in your webservice. Use the right tool for the job and all that.

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I have a class in which I want to inject a EntityManager based on not compile time known persistence unit name.
In an EE environment you would normally do something like
@PersistenceContext(unitName="pu1") private EntityManager em;
Now the problem is that I want this "pu1" to be dynamic based based upon a parameter.
In an SE environment (or also EE) I could create a
emf = Persistence.createEntityManagerFactory(name);
manually and pass in a dynamic persistence unit name.
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What is best way to do this in an EE environment?

If there will only be one persistence unit in scope then you can just leave the unitName out altogether :
@PersistenceContext private EntityManager em;
In this case the container will just consider the one persistence unit defined at the module or application level as the default and inject it.
If there might be more than one, you can define the dependency in your web.xml or ejb-jar.xml file.
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<persistence-context-ref>
<persistence-context-ref-name>persistence/myemref</persistence-context-ref-name>
<persistence-unit-name>pu1</persistence-unit-name>
</persistence-conetxt-ref>
Then you could look it up via java:comp/env :
(EntityManager) initialContext.lookup("java:comp/env/persistence/myemfref");
If you want to get a little fancier, you can use the .xml elements to cause the injection to happen.
<persistence-context-ref>
<persistence-context-ref-name>persistence/myemref</persistence-context-ref-name>
<persistence-unit-name>pu1</persistence-unit-name>
<injection-target>
<injection-target-class>com.acme.Foo</injection-target-class>
<injection-target-name>em</injection-target-name>
</injection-target>
</persistence-conetxt-ref>
Then your java code would look like :
// dependency and injection declared via deployment descriptor
private EntityManager em;
--ken

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This is in a class that is called from within a Stateless Session bean. In this class, I'm trying to use a UserTransaction object that is created as follows (taken from Zuffoletto's book):
========================================
env.put(Context.INITIAL_CONTEXT_FACTORY,
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ctx = new InitialContext(env);
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========================================
However, when I call tx.begin(), it throws an exception as follows:
========================================
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As I understand, you would like to setup a watch folder which will be getting pdf files in arbitrary intervals. You then want each pdf to be converted to ps in a separate folder.
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This question relates to EJB 3.0
I have a POJO in a non-ejb jarfile that I want to inject into an EJB. Is this possible? If so, how do I go about making it work?
Thanks,
Dave.

daver wrote:
This question relates to EJB 3.0
I have a POJO in a non-ejb jarfile that I want to inject into an EJB. Is this possible? If so, how do I go about making it work?Why must you inject a POJO class? There is nothing for the server to manage here so there really is no benefit of using an injection mechanism. Simply create an instance in the EJB method that needs the object.

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hi all
How to inject ejb in servlet ?
please explain how to config my servlet and my paroject
I have an ear file with two jar files
Thanks in advance

hi
I have this error in my project
I have an ear file ,two war file and three jar file in it
and I did configuration
but there was this error
14:19:45,398 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[conference-servlet].[enterLet]] Allocate exception for servlet enterLet: javax.naming.NameNotFoundException: ITrmnlAuthenticationBL not bound
@Remote
public interface ITrmnlAuthenticationBL{
@Stateless
public class TrmnlAuthenticationBL implements ITrmnlAuthenticationBL{
public class EnterLet extends HttpServlet {
@EJB(mappedName = "ITrmnlAuthenticationBL")
private ITrmnlAuthenticationBL trmnlMg;
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Interceptors for non EJB

Hi,
does the jee standard covers interceptors for non EJB classes? I'm using Glassfish and it worked for a plain java classes e.g.:
@Interceptors(TraceInterceptor.class)
public class PlainClass {
     public String doSomething() {
          return "somthing";
Hoever when I use the intercepter with a DAO class that's depending an an EntityManager e.g.:
@Interceptors(TraceInterceptor.class)
public class PersonDao implements IPersonDao {
     @PersistenceContext
     private EntityManager em;
     @Override
     public Person getById(Integer id) {
          return em.find(Person.class, id);
I get a NullPointer exeption because the Entity Manger is not injected.
so my question is: does the jee standard covers interceptors for non EJB classes?
Regards
Sebastian

Hi,
thanks for your response.
When I remove the @Interceptors annotation from the PersonDao everything works fine including the injection of the entity manager. When I add the @Interceptors annotation I get a null pointer at em.find(Person.class, id).
I’m new to JEE6 because I have worked with Spring the last 6 years. Accidently I never used the @Named annotation. Surprisingly that is no problem (at least in Glassfish).
Anyhow I added the @Named annotation to the DAO but that not changed anything, I still got a null pointer. What’s wrong?
@Interceptors(TraceInterceptor.class)
@Named
public class PersonDao implements IPersonDao {
     @PersistenceContext
     private EntityManager em;
     @Override
     public Person getById(Integer id) {
          return em.find(Person.class, id);
@Stateless
@Interceptors(TraceInterceptor.class)
public class TestSrv implements ITestSrv {
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     private IPersonDao personDao;
     @Override
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          return personDao.getById(id);
Best regards
Sebastian

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It seems like I would have to use a standalone Transaction Manager (not bundled with the app-server).

Hi,
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You can ask for a beta version through our website:
http://www.atomikos.com
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Guy
Guy Pardon ( [email protected] )
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http://www.atomikos.com/

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Thanks.
geoff

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Update Excise base value in MRP based and Non-MRP based billing

Hi Gurus,
We need to update Excise Base Value for Statistical Condition type. How to configure the same ?
Sl.No Pricing Condition Type      Active   Statistical           Passed to Accounting
1        MRP Price (Statistical)
2        Abatement (Statistical)
3       Surcharge (Active&Passed to Accounting)
4      Assessabel value (Statistical)
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Issue: When there is MRP Price higher than the List Price, then the Cutomer will be charged on the basis of Net Price only, but the duties amount to be paid to the government on MRP Price. so in this case I can not calculate Excise Duties on the Actual Net Price condition which is active and passed on to accounting. And always the Excise duties to be calculated on Assessable value(no:4). But that condition type if I make activate then it will pass to accounting and also getting added to the Net Value(KOMP-NETWR). How to come out of this situation.(as per the customer requirement both MRP based materials and non-MRP based materials are also considered in the same sale order i.e with the same pricing procedure).
Becasue of this EXBAS is not getting updated in the J_1IEXCDTL.
Gurus, Share your valuable experiences and suggestions.
Thanks &Regards
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09611147585

Dear Lakshmipathi,
As per your suggestion, I have maintained Material Assessable Value and then also the duty values are calculating on the basis of Assessable value maintained in the Pricing Procedure. It is not taking the Material Assessable Value into consideration. And it is not getting updated the Excise Base Value.
In which case Material Assessable value will be taken into consideration?
How to update the Excise Base Value in J_1IEXCDTL tables?
Thanks&Regards
Sreekanth

PO Release Strategy - Only for non material based

Experts,
I have a requirement to implement a release strategy for a single plant for POs for NON material based purchases ( only for using account assignments, cost centers etc).
The release strategy I configured is working only for the specific plant I want... However, it works whether its a material based PO or a non material based PO.
How do i get the strategy to work for only the service based purchases, and not the material ones?

Thanks for the replies but I'm not sure if they are applicable...
I did create a characterstic for item categories and added the one's I wanted to have... I did NOT include a blank because i thought that would make the difference between the material based PO and non PO. When we I create Po with material (even with no account assignment) it still goes through release.
Any reason why that is?
I dont believe the material group solution will not work either because we require material group for material and non material based POs..
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Edited by: farmerj3 on Jan 30, 2012 3:36 PM
Edited by: farmerj3 on Jan 30, 2012 3:39 PM
Edited by: farmerj3 on Jan 30, 2012 3:48 PM

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Hi,
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Next go to Init method.
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How to inject EntityManager in non-EJB based WebService?

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