Strut and EJB

Hi guys,
I am trying to call EJB in my strut action classes using @EJB and got the error java.lang.NullPointerException while I use InitialContext to lookup for the EJB manually it works. The error indicates, to me that the container did not inject the EJB object at the run time. Can anyone explain to me why using annotation to inject the EJB in action classes would not work? Am I doing something wrong?
Some environment info:
** Both my web application and EJB are on the same glassfish server
** The web application and EJB are not in the same .ear file, meaning they are separate applications
thanks in advance, Kenny
Edited by: user13433552 on 7/12/2010 16:36
Edited by: user13433552 on 7/12/2010 16:36

As far as I know, the JEE server can only inject into resources it "knows about", which are servlets, other EJBs, MDBs and for example JSF backing beans. Struts is not part of the JEE spec, so I guess it won't scan those classes.
But perhaps Struts itself has a mechanism to inject EJBs into an action class?

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Oracle --------------------------
Luis Soeiro <mailto:[email protected]> <mailto:[email protected]>Type : Question Date : Apr 11, 2002 15:15 PT Hello
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Jonny Oenning

Hi!
I rised this issue long time ago - with TP3 I noticed regression in EJB/JPA support with ADFm (binding layer as referred by Shay). Following the development, I draw this conclusions:
1. Oracle is oriented toward J2EE standards, including the strategic orientation to EJB/JPA. The team that managed JDev 11g initial development phases was oriented toward EJB (but was replaced/fired sometime between TP2 and TP3).
2. Oracle decided that FMW 11g stack products as well as EBS migration from PL/SQL to EJB is not feasible in short time frame (I think that was poor judgment). So, the BCs got the push over the EJB and TP3/4 was biased toward BCs. Even the default Fusion technology stack is changed - in TP1/2 the Fusion Web project was ADF RC + EJB buy default and then changed to ADF RC + BC4J. Also the development guides were "rephrased".
3. As BC4J are proprietary Oracle technology, the are lacking many J2EE standard features and many strong points of the modern multi-tier architecture. Many developers are witnessing the performance / scalability issues as the BC4J are basically a mutant: they are SQL based concept wrapped into EJB for deployment! But they are not relaying on proven scalable J2EE technologies (like JPA/JTA, object caching etc.). They are trying to reinvent the wheel, decalratively offering the heaven of J2EE multi-tear architecture to old fashion SQL-focused architects/developers. But it is just a marketing - the truth is that BC4J are not and cannot be the replacement for proven J2EE architecture. They are trying to mimic the concepts of J2EE (like object-entity mapping, like JTA/JPA, like scalability and caching, transparent web-services exposition etc.) but they are lagging behind even J2EE 1.4 and we are facing the J2EE 6 in few months!
4. Oracle is aware that EJB is the future but they are trying to bridge the gap between their legacy code written mainly in PL/SQL. So they developed and they are developing the JDeveloper 11g in fashin that should support and serve for their primary goals - migration of their own old PL/SQL based products to new, J2EE, world (of BEA!).
So, anyone who is expecting the that Oracle JDeveloper is what they are marketing (full scale J2EE IDE) - is going to waste some time and money waiting the Oracle to finish it's half-way migration from PL/QL and Forms/Reports to PL/SQL + ADF RC! In few years from now.
Thus, if you need efficiency in J2EE standards development - try something else than JDeveloper. Or, as suggested by Shay, don't use overmarketed ADFm as it is not compatible with EJBs in scalable / clustered deployment! Yes, that is proven issue (but I wont elaborate here as it is already well elaborated in this forum in another tread but the Oracle guys wisely neglected that issue).
And beside few very very old and for me useless blog entries (one of which is not working in 11g as you may read in comments) there will be no much support for EJBs in this release of JDeveloper - I can bet!
But, as final message to the public, I'm still stuck with JDev and EJBs as. When you develop you own patterns, it is still the best combination for developing the scalable, high performance apps on Oracle FMW 11g platform - mandatory including several grid technologies that are making the difference in scalability of true J2EE apps and quasi-J2EE "Fusion" apps based on BC4Js "silently" wrapped in EJBs for deployment.
Regards,
PaKo

Using JMX to read ejb manifest jar and ejb-jar.xml in ejb jar inside ear

Hello,
I have an ear deployed on weblogic console. I need to check contents of manifest file and ejb-jar.xml of a jar that is present in the deployed ear.
Currently I am using below code to access jar inside ear deployed :
Hashtable env = new Hashtable(5);
env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
env.put(Context.PROVIDER_URL,
url);
env.put(Context.SECURITY_PRINCIPAL, user);
env.put(Context.SECURITY_CREDENTIALS, password);
Context ctx = new InitialContext(env);
mBeanHome = (MBeanHome)ctx.lookup(MBeanHome.ADMIN_JNDI_NAME);
String type = "EJBComponentRuntime";
Set beans = mBeanHome.getMBeansByType(type);
try{
for(Iterator it=beans.iterator();it.hasNext();)
EJBComponentRuntimeMBean rt = (EJBComponentRuntimeMBean)it.next();
if(rt.getParent().getName().equals("xxx")){
System.out.println(rt.getName());
l.add(rt.getName());
Here xxx is the ear. Now I need to get inside the jar (represented) by variable rt and access its manifest file,ejb-jar.xml
Does anyone have an idea how to do this?
regards
Sameer

Isn't it possible to put them there manually? :)

SAS9.1 Persistence and EJB lookups (not registered in JNDI?)

I am trying to deploy a very basic EJB3 module to test my learning. The module deploys via the Admin Console without apparnet error. Unfortunately, when using the generated test page for the web-service, I am having total failure which seems to be around the persistence unit and EJBs not being created in the JNDI.
I have an @Stateless/@WebService bean:
package com.flexit.buslogic;
import java.util.logging.Level;
import javax.ejb.Stateless;
import javax.ejb.EJB;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import com.flexit.persistence.eao.OwnerFacade;
@WebService
@Stateless
public class CreateOwner {
 @EJB
 private OwnerFacade ownerFacade;
 public CreateOwner(){}
 @WebMethod
 public Integer addOwner (
 @WebParam(name="Name") String name){
 LogUtil.log("Add owner request " +
 "received for "+name,
 Level.INFO, null);
 return ownerFacade.findAll().size();
}The OwnerFacade EJB injection fails with avax.ejb.EJBException: nested exception is: javax.ejb.CreateException: Could not create stateless EJBIf I instantiate a 'normal' reference to OwnerFacade (ie OwnerFacade ownerFacade = new OwnerFacade(); I get a similar error in the OwnerFacade EJB in relation to an attempt to inject an EntityManager:
package com.flexit.persistence.eao;
import java.util.List;
import java.util.logging.Level;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import com.flexit.persistence.LogUtil;
import com.flexit.persistence.Owner;
@Stateless
public class OwnerFacade implements OwnerFacadeLocal, OwnerFacadeRemote {
 // fields
 @PersistenceContext(unitName="FlexIBuildPU")
 private EntityManager entityManager;
 public OwnerFacade () {
 if (entityManager == null) {
 LogUtil.log("unable to get an Entity Manager Instance", Level.SEVERE, null);
...The constructor logs that the entityManager is, indeed, null.
I have tried the code on SAS9 and 9.1 and using the default JavaDB and a MySQL connection pool (successful ping) and datasource (named 'jdbc/FlexDBDS') created through the Admin Console. The persistence unit is defined in a persistence.xml file in the META-INF folder:
<?xml version="1.0" encoding="UTF-8"?>
 <persistence xmlns="http://java.sun.com/xml/ns/persistence"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
 <persistence-unit name="FlexIBuildPU" transaction-type="JTA">
 <jta-data-source>jdbc/FlexDBDS</jta-data-source>
 </persistence-unit>
</persistence>Can anyone please save me from tearing my hair out (more)?

Have managed to resolve. There were two problems
First I was attempting to access a session bean directly rather than via an interface (eejit!) - ie:
@EJB OwnerFacade ownerFacadewhen it should have been:
@EJB OwnerFacadeLocal ownerFacadeSecond, the persistence unit wasn't created properly. In playing around with persistence.xml I moved from:
<?xml version="1.0" encoding="UTF-8"?>
 <persistence xmlns="http://java.sun.com/xml/ns/persistence"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
 <persistence-unit name="FlexIBuildPU" transaction-type="JTA">
 <description>This unit manages BMS units, owners, offers, and acceptance.</description>
 <jta-data-source>jdbc/FlexDBDS</jta-data-source>
 <properties>
 <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
 <property name="toplink.ddl-generation" value="create-tables"/>
 </properties>
 </persistence-unit>
</persistence>to:
<?xml version="1.0" encoding="UTF-8"?>
 <persistence xmlns="http://java.sun.com/xml/ns/persistence"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
 <persistence-unit name="FlexIBuildPU" transaction-type="JTA">
 <description>This unit manages BMS units, owners, offers, and acceptance.</description>
 <jta-data-source>jdbc/FlexDBDS</jta-data-source>
 <properties>
 <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
 <property name="toplink.application-location" value="C:\ddl\flexdb\"/>
 <property name="toplink.create-ddl-jdbc-file-name" value="create.sql"/>
 <property name="toplink.drop-ddl-jdbc-file-name" value="drop.sql"/>
 <property name="toplink.ddl-generation.output-mode" value="both"/>
 <property name="toplink.ddl-generation" value="create-tables"/>
 </properties>
 </persistence-unit>
</persistence>It seems the very action of writing the sql to file helps with the binding. It seems so extraordinary that I think I must of made another mistake which was corrected along the way. In any event, the properties specifying output files may prove useful to others. :)

Strut and EJB

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