How to inject ejb in servlet

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;
please explain my mistake

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How am I able to use an injected EJB in a Managed Bean Constructor?

JSF 1.2
EJB 3.0
Glassfish v1
Summary:
Managed bean injected EJB is null when referencing EJB var in constructor.
Details:
In my managed bean, I have a constructor that tries to reference an injected EJB, such as:
public class CustomerBean implements Serializable {
@EJB private CustomerSessionRemote customerSessionRemote;
public CustomerBean() {
List<CustomerRow> results = customerSessionRemote.getCustomerList();
}The call within the constructor to customerSessionRemote is null - I've double checked this in Netbeans 5.5.
How am I able to use an injected EJB in a Managed Bean Constructor?
Thanks,
--Todd

OK, I was reading the article Web Tier to Go With Java EE 5: A Look at Resource Injection and I understand your statement too.
Is there any way possible to Inject the EJB prior to the bean instance creation at all?
Maybe, I need to approach it with the old fashion Java EE 1.4 route and using JNDI in the PostConstruct annotated method to reference the EJB in the managed bean.
This had to been thought out before, I don't understand why a manged bean's life cycle places any injections at the end of the bean creation.
Also, now that I understand that the @PostConstruct annotated method will be called by the container after the bean has been constructed and before any business methods of the bean are executed.
I am trying to reference my EJB as part of the creation of the managed bean.
What happens: the JSF page loads the managed bean and I need to populate a listbox component with data from an EJB.
When I try to make the call to the EJB in the listbox setter method, the EJB reference is null.
Now, I'm not for sure if the @PostConstruct annotation is going to work... hmmmm.
** Figured it out. ** I just needed to move the EJB logic that was still in the setter of the component I wanted to populate into the annotated PostConstruct method.

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Hi all,
How can I add a classpath to EJB and Servlets in Weblogic 6.1, so that that classpath
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the jar and war files. Now the EJBs inside the jar file are not reaching the class
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Atanu

Hi.
You might try looking at the petstore example which combines webapps (war files) with
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Regards,
Michael
Atanu Dey wrote:
Hi all,
How can I add a classpath to EJB and Servlets in Weblogic 6.1, so that that classpath
can be achieved by both EJB jar and war file? I have deployed a .ear file having
the jar and war files. Now the EJBs inside the jar file are not reaching the class
files of the war file and the class files in the war file are not reaching to
the EJBs. Please let me know at the earliest.
Atanu--
Michael Young
Developer Relations Engineer
BEA Support

Reference EJB from servlet's action/helper classes

Hello
How to make a reference to stateless session bean from one of the helper classes of a servlet WITHOUT using any of these:
* dependency injection (like @EJB) - I think this is not supported in this kind of class, EJB references can be injected only to servlets themselves or some other things (but not objects of classes "accompanying" a servlet)
* home or local home interfaces (I would like to avoid writing them)
* using mappedName (either in @Stateless or in ejb-jar) - since meaning of this is application-server dependent and thus not portable.
By a "class accompanying a servlet" / "helper class" I mean utility or action classes, like MyActionClass, which would be instantiated and then used by a aforementioned servlet.
Thanks.

The EJB dependency must be looked up via the java:comp/env namespace since as you point out
Java EE 5 environment annotations are not supported on POJOs. However, the dependency itself
can either be defined using @EJB on some other managed class in the .war or within the
web.xml. We have an entry in our EJB FAQ that has the details :
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html#POJOLocalEJB
Also, whenever the client component resides in the same application as the target EJB (which is
required for Local access but not for Remote access) there is no need to use mappedName to
resolve the EJB dependency. It is either automatically resolved if the business interface type of
the EJB dependency is only exposed by a single EJB in the application, OR the beanName()
/ ejb-link attributes can be used to unambiguously identify the target EJB using ejb-name.
You can find more about this in the FAQ as well.

Access EJB from Servlet that in different archive?

<font class="mediumtxt">package kyro.ejb.session;
import javax.ejb.*;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless(name="StandAlone")
@Remote(StandAlone.class)
public class StandAloneBean
implements StandAlone, StandAloneLocal
public StandAloneBean() {
public String sayHello() {
return "sayHello";
I want to access ejb from servlet that .war and .jar not in single .ear. I want to try that just with annotation not xml descriptor cause is easy to understand for me. I use Glassfish. But i can't lookup that ejb. How can i lookup that ejb with jndi? Can't you give me example of servlet to access that? I not use JNDI.properties, are that caused i can't access my ejb? I just thing .war and.jar in one server, are i have to used JNDI.properties. can you explain how to use JNDI.properties in servlet or separate file?
</font>

But i can't lookup that ejb. How are you trying and what exception is occurring?
How can i lookup that ejb with jndi? [https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html|https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html]
m

EJB and Servlets

Hi there,
A frontend processing of HTTP request that pass thru WebLogic server that make
API calls thru tuxedo to the application servers that eventually running C, C++
that retrieve data from a backend database of Oracle.
Being the services of EJB and Servlets, EJB is more kind of processes inside the
server but Servlets can handle better in request and respond (talk to the client),
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Thanks
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Sorry, wrong question, just ignore it.

EJB and Servlets on different clusters

          Say I set up two clusters, one for servlets and one for EJBs.
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          Can you specify something like this in the properties file?
          What's the best way to do this?
          Please advise,
          Dave


David,
          How about specifying the EJB cluster URL in the servlets init argument in the
          weblogic.properties ??
          Sam
          David Mrozek wrote:
          > Say I set up two clusters, one for servlets and one for EJBs.
          > To lookup to EJBs, the servlets must look up an initial context and provide a URL.
          > Should the URL be hardcoded in the servlet to the EJB cluster name, or is there a way
          > to specify this URL at a higher level?
          > Can you specify something like this in the properties file?
          > What's the best way to do this?
          > Please advise,
          > Dave

EJB versus servlet

Hello everyone,
I'm hoping you can point me in the right direction. I'm looking for
articles or books that cover the pros and cons of implementing solutions
using EJBs and/or servlets. More specifically, when and where it makes the
most sense to use EJBs or servlets or both, and how the two compare. Also,
how well regarded are EJBs in the marketplace (seems to be a love/hate
relationship).
I've read some of Jason Hunter and Richard Monson-Haefel's older material
but I'm hoping you might know of (or have) something more recent.
Thanks in advance!
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          Of course the best article is the one that Xiang suggested, J2EE blueprints.
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          http://www.javasuccess.com/design_wp.html
          And of course this one:
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          "Joe Martins" <[email protected]> wrote:
          >Hello everyone,
          >
          >I'm hoping you can point me in the right direction. I'm looking for
          >articles or books that cover the pros and cons of implementing solutions
          >using EJBs and/or servlets. More specifically, when and where it makes
          >the
          >most sense to use EJBs or servlets or both, and how the two compare.
          > Also,
          >how well regarded are EJBs in the marketplace (seems to be a love/hate
          >relationship).
          >
          >I've read some of Jason Hunter and Richard Monson-Haefel's older material
          >but I'm hoping you might know of (or have) something more recent.
          >
          >Thanks in advance!
          >
          >Joe
          >
          >

Unable to access EJB from servlet

Hi,
I have in service method my servlet code.
Hashtable env = new Hashtable();
                    env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.ApplicationInitialContextFactory");
                    env.put(Context.PROVIDER_URL, "ormi://localhost/hello");
                    env.put(Context.SECURITY_PRINCIPAL, "admin");
                    env.put(Context.SECURITY_CREDENTIALS, "mypwd");
                    Context ctx = new InitialContext(env);
          Object obj = ctx.lookup("HelloName");
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                    Hello hello = home.create();
this is how i have orion-ejb-jar.xml
     <enterprise-beans>
          <session-deployment name="Hello" location="HelloName" >
          </session-deployment>
     </enterprise-beans>
     ejb-jar.xml
          <session>
               <ejb-name>Hello</ejb-name>
               <home>examples.HelloHome</home>
               <remote>examples.Hello</remote>
               <local-home>examples.HelloLocalHome</local-home>
               <local>examples.HelloLocal</local>
               <ejb-class>examples.HelloBean</ejb-class>
               <session-type>Stateless</session-type>
               <transaction-type>Container</transaction-type>
          </session>
When i access the servlet i get this error.
javax.naming.NameNotFoundException: HelloName not found
     at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:149)
     at com.evermind.server.ApplicationContext.lookup(ApplicationContext.java:217)
     at com.evermind.server.ApplicationContext.lookup(ApplicationContext.java:88)
     at javax.naming.InitialContext.lookup(InitialContext.java:345)
     at examples.HelloServlet.service(Unknown Source)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:772)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:317)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:782)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:479)
Is location attribute in orion-ejb-jar.xml used to specify JNDI name? Can i get the JNDI tree showing the name mappings in oc4j? How do i correct this error?
Ravi

Ravi --
The most portable and standards oriented solution is to define an ejb-ref in the web.xml for the servlet, and then look up the name using the formal EJB UNC model.
web.xml:
<ejb-ref>
<ejb-ref-name>ejb/AppSessionFacadeHome</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>faqapp.ejb.AppSessionFacadeHome</home>
<remote>faqapp.ejb.AppSessionFacade</remote>
</ejb-ref>
servlet lookup
InitialContext ctx = new InitialContext();
Object homeObject = ctx.lookup("java:comp/env/ejb/AppSessionFacadeHome");
EJBHome ejbHome = (EJBHome)
portableRemoteObject.narrow (homeObject, AppSessionFacadeHome.class);
cheers
-steve-

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Slawek_Sobotka wrote:
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So I'll redefine my question to be problem oriented:
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http://code.google.com/p/struts2ejb3-jboss-plugin/
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I want to call, consecutively these methods in my application.
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reponse.sendRedirect(servlet-url2)
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How to inject ejb in servlet

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