Accessing EJBs from a Web project

Hi,
I am getting the error: "com.sap.engine.services.jndi.persistent.exceptions.NameNotFoundException: Path to object does not exist at java:comp, the whole lookup name is java:comp/env/ejb/UserInfoServer." when I try to access the session bean from my web project. I have followed the instructions explicitly in http://help.sap.com/saphelp_nw04s/helpdata/en/55/29ed5eff965448941c0b42f01b9804/frameset.htm and also tried every other combination I can think of for configuring the references in both the EJB project & the web project (both in the same ear). I do have a jndi name in the visual administrator for localebjs/sap.com/myEar/UserInfoServer. Does anyone have any ideas?
Thanks & merry Christmas/Happy New year to all the SDN folks!

I've managed to get around the problem for the time being by using "/localejbs/provider/application/beanName" - bypassing (I think) the whole JNDI issue - this is OK for now, but it's obviously not a long term fix.
Previously, I had used the default & so did not enter anything in the ejb-j2ee-engine.xml, and so my ejb's showed up nicely in the Visual Administrator JNDI Registry under the localejbs tab as you would expect. The problem appears to be in the Web project - The key is that the error is "Path to object not found" rather than "Name not found". It seems to me that it knows what it is looking for & that it is valid, but doesn't know how to get there! Note that the EJB project is in the same EAR. The only reference to "Path" that I can find is in the help doc above where it says "If the name of the target enterprise bean is not unique in the enterprise application scope, you can enter the path to the JAR file that contains the bean...". I've gone through the Car Rental Application pdf (I can't find the download that contains the entire application) & followed the instructions there explicitly for referencing ejbs from the web..

Similar Messages

Security exception while trying to access EJB from stand alone client

Hi!, I am trying a sample EJB application to R&D some security related issues. I want to access EJB through a web application as well as a stand-alone client. I have set approriate <method-permission> in EJB deployment descriptor. I am using users.properties/roles.properties file for authentication mechanism. I am using JBoss 3.2.
- On the web application side I am using BASIC authentication and the servlet is able to access the EJB OK, as long as I am using a login/password that has access to the EJB.
- Now I am trying to access the EJB using a stand alone Java class. These are the things I have tried till now:
=>Created a InitialContext with appropriate principal, credentials and tried getting a reference to EJB home interface. That resulted in security exception.
=>Logged into a LoginContext by using appropriate JBossSX classes and then tried getting a EJB home interface. Again security exception.
Now I am not sure what to do. I read at some places about client side container but not sure what that is. Does anyone has any ideas to try? Is there any other way I can make a swing application and a web application authenticate to EJB container?
Also can anyone point me to any documentation that gives some idea about how the security credentials gets propagated from web application/standalone client to EJB container?

It would be better if you can post your code...and DD that way we can help you better

Access EJB from Servlet that in different archive?

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?


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

Call ejb from a java project

i have a steteless session bean and i want to access it from a standalone java application.It is working fine with a web client.
My java code is
public class TestEJBFromJava {
     public static void main(String[] args) {
          try {
                         Context ic= new InitialContext();
                         Object obj=ic.lookup("ejb/com/renault/test/TestHome");
                         TestHome home=(TestHome) PortableRemoteObject.narrow(obj,TestHome.class);
                         Test test=home.create();
                         System.out.println(test.printMyName);
                    } catch (NamingException e) {
                         e.printStackTrace();
                    } catch (RemoteException e) {
                         e.printStackTrace();
                    } catch (CreateException e) {
                         e.printStackTrace();
and the exception i m getting is......
vax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
     at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:652)
     at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:255)
     at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:292)
     at javax.naming.InitialContext.lookup(InitialContext.java:359)
     at com.renault.test.TestClient.main(TestClient.java:27)
Please help me to know where i went wrong...

You need to know that some questions like this are rather FAQ so check the other thread for similar problem
http://forum.java.sun.com/thread.jspa?threadID=5297502&tstart=0

Accessing EJBs from a servlet

Hi everyone,
I deployed my EJB component in an Oracle 8.1.7 database and I try to access it from a servlet.
If I run my servlet from JDeveloper 3.2 (Web-to-Go), it all works fine. If I run my servlet from JRun 3.01 or from Tomcat 3.2.1, I get the following exception:
javax.naming.NoInitialContextException: Need to specify class name in environmen
t or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at javax.naming.NamingException.<init>(NamingException.java:104)
at javax.naming.NoInitialContextException.<init>(NoInitialContextException.java:58)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:649)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:242)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:279)
at javax.naming.InitialContext.lookup(InitialContext.java:349)
at com.cognicase.framework.base.U0003.AbstractORB.getBean(AbstractORB.java:285)
at com.cognicase.framework.base.U0003.AbstractORB.getBean(Compiled Code)
at com.cognicase.demo.U2007BL.U2007WP_Users.lookupBean(U2007WP_Users.java:60)
at com.cognicase.framework.is.U0103.AbstractBeanWrapper.beforeBeanCall(AbstractBeanWrapper.java:121)
at com.cognicase.demo.U2007BL.U2007WP_Users.valideUser(U2007WP_Users.java:77)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.CallEjb(Compiled Code)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.doValidateLogin(Compiled Code)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.processService(U2000MW_WorkSpace.java:98)
at Demo_0100_01.service(Demo_0100_01.java:128)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.service(Compiled Code)
at org.apache.tomcat.core.ContextManager.internalService(Compiled Code)
at org.apache.tomcat.core.ContextManager.service(Compiled Code)
at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection(Compiled Code)
at org.apache.tomcat.service.TcpWorkerThread.runIt(Compiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)
If I add my servlet classes, aurora_client.jar, mts.jar, vbjapp.jar and vbjorb.jar files to the CLASSPATH, it works fine.
The behavior is the same in JRun and Tomcat.
I don't like this solution since I have to make the CLASSPATH point to my application classes at the web server level instead of at the application context level.
Has anyone been able to solve this problem?
Thanks for your help.
null

Yes, I did. Actually, if I run my servlet in JDeveloper (Web-to-Go), it all works fine. I also extracted the code that calls the EJB from the servlet and I tested it in a small Java application, and it also works fine.
Things stop to work when I deploy my servlet in JRun or in Tomcat.
It appears that my code is correct, but the environment I try to run it is not, and I can't figure out what's wrong.
Can anyone help me?
<BLOCKQUOTE>quote:<HR>Originally posted by Sandeep Desai ([email protected]):
Have you provided the environmental settings in the servlet.
It should be :
import oracle.aurora.jndi.sess_iiop.ServiceCtx;
env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
env.put(Context.SECURITY_PRINCIPAL, username);
env.put(Context.SECURITY_CREDENTIALS, password);
env.put(Context.SECURITY_AUTHENTICATION, ServiceCtx.NON_SSL_LOGIN);
InitialContext ctx = new InitialContext(env);
Object obj = ctx.lookup("test/EJBHome");
HomeObject home = PortableRemoteObject.narrow(
obj,"HomeObject.class");
RemoteObject remote = home.create();
This should make it work!!
<HR></BLOCKQUOTE>
null

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Not able to access schema from a Web Server

I am not successful in using a schema from a web server. I am using j2sdk1.4.2_06, and JDOM-b10. I have been successful in accessing schema using a file path, but not with a web address. The server is Windows Server 2003, I create a virtual directory using IIS under Inetpub.
Let the URL be: http://server/research_schema/client.xsd
This would be accessible only on the intranet.
Here is some XML:
<client xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="http://server/research_schema/client.xsd">
<execute matlab="false" commit="false" return_server_msg="false">
<t1>
<load_batch_data>
<username>test</username>
<password>test</password>
<database>db</database>
<get_next_batch>true</get_next_batch>
</load_batch_data>
</t1>
</execute>
</client>
Here is the code that sets the parser to be validating, and sets the schema location, I am using JDOM:
builder = new SAXBuilder("org.apache.xerces.parsers.SAXParser", true);
builder.setFeature(
"http://apache.org/xml/features/validation/schema",
true);
builder.setProperty(
 "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation",
 "http://server/research_schema/client.xsd");
doc = builder.build(source);The error I get is a JDOMException saying the client element is not found, but I know that the client element is there, after seeing the XML output to
a file from the sender.
I see many exmples on the internet using a URL for the schema location, and it is usually the internet and not just the intranet. So it does work for someone.
I'd appreaciate any help.

Steve, et. al.,
My apologies for using this in lieu of email, but I have been searching and searching for the answer to your questions from last summer concerning the correct method for getting the local xsd file to be correctly accessed from the xml file when using JDOM to parse with validation..
I did not see successful resolution of the thread from last summer, but this one seems closely related and suggests that you were either instructed to give up, or gave up on your own and went to the solution of placing the xsd file on a server.
Maybe I've got my head screwed on wrong, but I, like you, would like to find a successful way to make xml processing work for a JWS-provisioned application the same as it would if I just sent the clients a big jar file and told them to unjar it to some convenient local directory. In that scenario xsi:noNamespaceSchemaLocation = "itsrighthere.xsd" works as expected.
Can anyone tell us what the correct method of specification is in the JWS context?
Thank you.

Help me which JNDIFactory to use to access EJB from a java class of JAR

I am confused in understanding the different JNDI factories
RMIInitialContextFactory, ApplicationInitialContextFactory and ApplicationClientInitialContextFactory
And the different namespaces like global, container local and component local.
Especially is there any relationship between the JNDI factories and the namespaces?
Or are they related to the deployment descriptors.
Because in application specific deployment descriptors (orion-ejb-jar.xml), we just map the JNDI location with the object (or its reference from ejb-jar.xml). We dont specify it can be accessed from this factory or that.
Shall we access an EJB from using any JNDI factory?
Specifically, I am stuck with what Factory to use to access an EJB from a Java class in a library (jar). The JAR is packaged with the EAR which contains the EJB Jar that I am trying to access.
THANK YOU

Ed,
As Robin said, I think you need code similar to this:
Context c = new InitialContext();
Object o = c.lookup("java:comp/env/Name");where Name is the name of your EJB as it appears in the "ejb-jar.xml"
deployment descriptor XML file.
Good Luck,
Avi.

Issue in accessing EJB from plain java

Hi,
I am new to OAS. I am using OAS 10.1.2.
I want to access EJB which runs inside OAS, through a plain java program which runs from outside the OAS environment (standalone java program).
I am confused on what to use. RMIInitialContextFactory or ApplicationClientInitialContextFactory for the context in the java program.
what should be the provide URL ?
java.naming.provider.url","ormi://hostname:18140/
is it "ormi" or something else? what is the port number should i use. there are many ports in this OAS. i see that in the console("Ports") link.
also let me know what should i mention in the EJB xml descriptor.
Is this lookup to be done by retrieving from jndi?
pls help.
Thanks,
Sukumar
with this confusion i developed an EJB with the following details
ejb-jar.xml
<ejb-ref>
 <ejb-ref-name>ejb/testDetails</ejb-ref-name>
 <ejb-ref-type>Entity</ejb-ref-type>
<home>com.xxx.xxx.testDetailsHome</home>
<remote>com.xxx.xxx.testDetails</remote>
 </ejb-ref>
orion-ejb-jar.xml
<entity-deployment name="ejb/testDetails" location="ejb/testDetails"
Client Java program
public class testDetailsClient
public static void main(String [] args)
testDetailsClient testDetailsClient = new testDetailsClient();
try
Context context =getInitialContext();
testDetailsHome testDetailsHome = (testDetailsHome)PortableRemoteObject.narrow(context.lookup("java:comp/env/ejb/testDetails"), testDetailsHome.class);
testDetails testDetails;
catch(Throwable ex)
ex.printStackTrace();
private static Context getInitialContext() throws NamingException
Hashtable env = new Hashtable();
env.put("java.naming.factory.initial","com.evermind.server.rmi.RMIInitialContextFactory");
//env.put("java.naming.factory.initial","com.evermind.server.ApplicationClientInitialContextFactory");
env.put("java.naming.provider.url","ormi://host_name:18140/"); //23791 18140
env.put(Context.SECURITY_PRINCIPAL, "ias_admin");
env.put(Context.SECURITY_CREDENTIALS, "abc123");
InitialContext context = new InitialContext(env);
return context;
if i execute this, it says
javax.naming.NameNotFoundException: java:comp/env/ejb/testDetails not found
18140 is Application Server Control RMI port.
if i run the same code with ApplicationClientInitialContextFactory, it throws exception saying
java.lang.InstantiationException: No location specified and no suitable instance of the type 'com.testdetails.testDetails' found for the ejb-ref ejb/testDetails
 at com.evermind.server.administration.ApplicationResourceFinder.getEJBHome(ApplicationResourceFinder.java:268)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:324)
 at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:124)
 at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:48)
 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
 at java.lang.Thread.run(Thread.java:534)
javax.naming.NamingException: Error reading application-client descriptor: No location specified and no suitable instance of the type 'com.testdetails.testDetails' found for the ejb-ref ejb/testDetails
 at com.evermind.server.ApplicationClientInitialContextFactory.getInitialContext(ApplicationClientInitialContextFactory.java:161)
 at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
 at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
 at javax.naming.InitialContext.init(InitialContext.java:219)
 at javax.naming.InitialContext.<init>(InitialContext.java:195)
 at com.testdetails.testDetailsClient.getInitialContext(testDetailsClient.java:89)
 at com.testdetails.testDetailsClient.main(testDetailsClient.java:20)
pls help

Hi,
you do not have to package your EJB and PAR together! You can deploy them separately and then reference the J2EE Application from your PAR or vice versa to access it.
For instance you can access the EJB from your PAR as described here:
http://help.sap.com/saphelp_nw2004s/helpdata/en/42/9ddf20bb211d72e10000000a1553f6/frameset.htm
Or you can access a Portal application from J2EE like described here:
http://help.sap.com/saphelp_nw2004s/helpdata/en/42/9ddd0cbb211d72e10000000a1553f6/frameset.htm
Even if you package your PAR in to the same EAR with your EJB they will result in two different containers on the J2EE Engine and you will have to reference them as described in the link above to access the functionality of one component from the other.
Best regards,
Stefan Brauneis

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");
 HelloHome home = (HelloHome) javax.rmi.PortableRemoteObject.narrow(obj, HelloHome.class);
 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-

Accessing EJB from Console App.

I have deployed in EJB with JNDI name "greeter" in Sun Java� System Application Server Platform Edition 8.
Then i am trying to access EJB using a console app (given below).
import javax.ejb.*;
import javax.rmi.*;
import java.util.*;
import javax.naming.*;
public class Client
public static void main(String args[])
Greeter myGreeterBean;
GreeterHome myGreeterHome;
Greeter myGreeterRemote;
Context context = null;
try
context = new javax.naming.InitialContext();
catch (Exception e)
System.out.println( "Unable To Get Initial Context");
return;
System.out.println("Got Context...");
try {
String JNDIName = "greeter";
Object objref = context.lookup(JNDIName);
System.out.println("Got Access To Object");
myGreeterHome =(GreeterHome) PortableRemoteObject.narrow(objref,
GreeterHome.class);
myGreeterRemote = myGreeterHome.create();
String theMessage = myGreeterRemote.getGreeting();
System.out.println(theMessage);
catch(Exception ex) { System.out.println( ex.getMessage()); }
} // end of main
} // end of Client
But, while i am running this program i am getting the following error:
Got Context...
Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
I don't know where i am wrong. Any idea about it ?
Thank you,
P.Srikanth.

This is what you need to modify :)
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "<<your
initial context factory>>");
env.put(Context.PROVIDER_URL, "<<JNDI provider
URL>>");
// Check documentation for exact Strings to be set.
// Pass the environment parameters to
InitialContext.
Context context = new InitialContext(env);
Angel
No this is not correct. Lookups in SUN AS works a bit differently.

How to access an EJB from a web application deployed in the same server

Hey All,
I deployed an EJB named EventServerBean to Sun Application Server 9.0, and put the client side jar file (named eventserver.jar which is generated by Sun Application Server) to C:\Sun\AppServer\lib. Now, I have a web application which is a simple jave file -- lookup EventServer EJB and invoke a remote method in this EJB. However, the web application always throws an exception "java.lang.NoClassDefFoundError: eventserver/EventServerRemoteHome"
Here is my java class that access the ejb:
public class Post_Event {
 public HashMap<String, String> getEventInfo(String event_name, String site) {
 System.out.println("Post_Event, the class path: " + System.getProperty("java.class.path"));
 System.out.println("Post_Event, user.dir: " + System.getProperty("user.dir"));
 System.out.println("Post_Event, java.library.path: " + System.getProperty("java.library.path"));
 HashMap<String, String> result = null;
 EventServerRemote remote = null;
 StringTokenizer st, st2;
 // here get the event information from host
 try {
 String lookupStr = "corbaname:iiop:" + site + ":3700#ejb/EventServerBean";
 InitialContext initialContext = new InitialContext();
 EventServerRemoteHome remoteHome = (EventServerRemoteHome) javax.rmi.PortableRemoteObject.narrow(initialContext.lookup(lookupStr), EventServerRemoteHome.class);
 if (remoteHome != null) {
 remote = remoteHome.create();
 } catch (javax.naming.NamingException ne) {
 ne.printStackTrace();
 return null;
 } catch (javax.ejb.CreateException ce) {
 ce.printStackTrace();
 return null;
 } catch (java.rmi.RemoteException re) {
 re.printStackTrace();
 return null;
 } catch (java.io.IOException ioe) {
 ioe.printStackTrace();
 return null;
 System.out.println("look up remote event server successfully.");
 result = remote.getEvent(event_name);
 return result;
 } I output the class path in this java file, and the class path DOES include the path C:\Sun\AppServer\lib where eventserver\EventServerRemoteHome.class is.
Does anyone know why it happens? Why a java class can't find a class that is in its class path?
appreciate any help!

<BLOCKQUOTE>quote:<HR>Originally posted by Wael Abbas ([email protected]):
Thank you for your great topic.
I think you need to copy the snippet code and past it to every application, applet, servlet or JSP every time you need to use your EJB.
Its better to include this snippet code in a simple JavaBean and use this bean as a bridge to your EJB, you may include a connect method in your JavaBean or but the connection code in the constructor and include a setters, getters and other methods to encapsulate your EJB methods.
You can use your JavaBean in any application, applet, servlet or JSP just create an object form it and call its methods.
Its just an idea
I hope it will be useful.
<HR></BLOCKQUOTE>
null

How do I include javax.ejb.EJB in a Web Project?

Hi,
I have set up an application with two projects. One is called EJBModel and the other is UserInterface. In my UserInterface project, I am writing a bean class and I want it to access the controller beans created in EJBModel. I created a private type for the controller bean and used the @EJB annotation. When I try to import javax.ejb.EJB I get an error saying it is not found. Other javax packages popup on the list of available imports, but not ejb. How do I include it in the UserInterface project?
Thanks in advance...

Yeah your right...let me further explain what I'm doing.
I'm creating a web application using the Model-View-Controller design pattern. Model represents data, View represents data display, and Controller is control. I created the EJBModel project in my web app to contain the model aspect. So it has entity objects and beans to access/manipulate the data. Then I created the UserInterface project to store the web interface - mostly jsps. In the UserInterace project, I need a managed bean that calls methods from the beans created in the EJBModel project. I can do this using the @EJB annotation and creating an instance of the class, but since the files are in separate projects that can't see each other and JDeveloper shows an error because it can't find the necessary file. It is best practice to create two projects to keep both elements distinct.
So I wanted to know the best way to access the files stored in separate projects within the same application.

Error when calling an EJB from a web sevice

Hi all,
I am getting the following error while trying to the lookup for my session bean
com.sap.engine.services.jndi.persistent.exceptions.NameNotFoundException: Path to object does not exist at java:comp, the whole lookup name is java:comp/env/ejb/MyProcessorBean
here's a part of my code:
String WebserviceFunction()
Context ctx = new InitialContext();
BiasProcessorLocalHome orderHome =(BiasProcessorLocalHome)ctx.lookup("java:comp/env/ejb/MyProcessorBean");
I am using NWDS Version: 7.0.09
SAP NetWeaver 2004s.
I did find some threads related to it but none has been answered or weren't
that helpful in solving my problem.
Thanks
null

Hi,
What is the implementation of your Web service? If it's another EJB then you have to define an ejb-local-ref in the deployment descriptor for that other EJB, like this:
<ejb-local-ref>
 <ejb-ref-name>ejb/MyProcessorBean</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <local-home>your.package.BiasProcessorLocalHome</local-home>
 <local>your.package.BiasProcessorLocal</local>
</ejb-local-ref>
If it's not a J2EE component, there is no java:comp environment naming context (ENC) available. In this case you can look up the EJB local home from the "localejbs/" context, e.g. "localejbs/provider.name/YourAppName/YourEjbName". By default the provider name is "sap.com".
For more information please refer to <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/java/accessing%20ejb%20applications%20using%20jndi.pdf">this article</a>.
HTH!
-- Vladimir

Problem accessing ejb from servlet

Hi,
I'm aving a problem accessing a stateful session bean from a servlet. I'm using a jndi lookup to do it because I need that a client has its own bean reference...
My code into the service method is:
InitialContext ctx;
try {
ctx = new InitialContext();
carrelloService = (CarrelloLocal)ctx.lookup("java:comp/env/ejb/Carrello");
and I have a reference to EJB into web.xml:
<ejb-local-ref>
<ejb-ref-name>ejb/Carrello</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home></local-home>
<local>carrello.model.CarrelloLocal</local>
</ejb-local-ref>
If I use @EJB annotation to inject the servlet, it works fine.
Instead using jndi lookup throws a NamingException because it doesn't find java:comp/env/ejb/Carrello entry.
Any idea about the problem?

Here's something simple that I have that works:
 
SimpleBean
 
@Stateless(name="SimpleBean")
public class SimpleBeanBean implements SimpleBeanLocal {
 
web.xml; -- note I use a whacko ejb-ref-name just to make it obvious where I'm using it.
 
 <ejb-local-ref>
 <ejb-ref-name>ejb_mapping_doodad/SimpleBean</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <local>sab.otn681398.ejb.SimpleBeanLocal</local>
 </ejb-local-ref> 
servlet:
 
package sab.otn681398.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.*;
import javax.servlet.http.*;
import sab.otn681398.ejb.SimpleBeanLocal;
public class TestServlet extends HttpServlet {
 private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
 private static final String SIMPLE_BEAN_JNDI = "ejb_mapping_doodad/ASimpleBean";
 private final boolean USEENC = true;
 private SimpleBeanLocal simple = null;
 public void init(ServletConfig config) throws ServletException {
 super.init(config);
 public void doGet(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException {
 response.setContentType(CONTENT_TYPE);
 PrintWriter out = response.getWriter();
 try {
 if(simple==null) {
 simple = createSimple();
 } catch(NamingException ne) {
 throw new ServletException("Error in looking up the EJB", ne);
 out.println("<html>");
 out.println("<head><title>TestServlet</title></head>");
 out.println("<body>");
 out.printf("The %s bean has been hit: %s times", simple, simple.getHitCount());
 out.println("</body></html>");
 out.close();
 private SimpleBeanLocal createSimple() throws NamingException {
 return (USEENC==true? createSimpleViaENC(): createSimpleViaName());
 private SimpleBeanLocal createSimpleViaENC() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup("java:comp/env/" + SIMPLE_BEAN_JNDI);
 return simple;
 private SimpleBeanLocal createSimpleViaName() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup(SIMPLE_BEAN_JNDI);
 return simple;
} 
-steve-

Accessing EJBs from a Web project

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