Annotation for EJB 3

I'm a java programmer for a few years .
I'm new EJB environment.
ejb is very difficlut to get.
and futhermore,
like @EJB,
what's @XXX form?
does any body know the simple starting point?
any artices or information is welcomed.
Thanks.

EJB 3.1 is easy to learn.
To lean in general about annotations (@XXX) go to: http://java.sun.com/j2se/1.5.0/docs/guide/language/annotations.html
To Learn about EJB technology: http://jcp.org/en/jsr/detail?id=318
To learn more about EJB in GlassFish visit: https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html

Similar Messages

Clustering annotation for EJBs ?

Hi all,
from the Oracle WLS documentation I have learnt that you can specify clustering via weblogic-ejb-jar.xml:
<stateless-clustering>
<stateless-bean-is-clusterable>True
</stateless-bean-is-clusterable>
<stateless-bean-load-algorithm>random
</stateless-bean-load-algorithm>
</stateless-clustering>
However is it possible to specify this via annotations too ?
Thanks a lot
Frank

Hi Frank --
The general pattern is that settings such as clustering, bean pool sizing, etc. are not exposed as annotations since these typically are configuration elements that define behaviour of an application at runtime and are better expressed in the external form of the deployment descriptor.
Happy to hear about your requirements here though.
-steve-

Writing a Standalone Client for EJB 3.0 Bean For Weblogic 10

Steps for Writing a Standalone Client
Client Code
package com.client;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
import com.StatelessService;
public class StatelessClient {
     public static void main(String [] args){
          Context ctx = null;
          try {
               ctx = getInitialContext("t3://localhost:7001/protossbservice","weblogic","weblogic");
               Object ref = ctx.lookup("StatelessService#"+StatelessService.class.getName());
               StatelessService service = (StatelessService)PortableRemoteObject.narrow(ref,StatelessService.class);
               System.out.println("StatelessClient.getMessage() ++");
               String message = service.getMessage();
               System.out.println("StatelessClient.getMessage --");
                    System.out.println("Message from Bean "+message);
     } catch (NamingException e) {
               e.printStackTrace();
     private static Context getInitialContext(String url, String user, String password) throws NamingException {
        Properties h = new Properties();
        h.put(Context.INITIAL_CONTEXT_FACTORY,
                "weblogic.jndi.WLInitialContextFactory");
        h.put(Context.PROVIDER_URL, url);
        h.put(Context.SECURITY_PRINCIPAL, user);
        h.put(Context.SECURITY_CREDENTIALS, password);
        return new InitialContext(h);
Business Interface
package com;
public interface StatelessService {
     public String getMessage();
Stateless Session Bean
package com;
import javax.annotation.PostConstruct;
import javax.ejb.Remote;
import javax.ejb.Stateless;
* Test Stateless Session Bean
@Stateless(mappedName="StatelessService")
@Remote(StatelessService.class)
public class StatelessServiceBean implements StatelessService {
     public String getMessage(){
          return "I am invoked";

emekaco wrote:
Hi,
I am a trainee although with a good background in java.
I'm urgently in need of a free ebook for EJB 3.0 with the latest version of Netbean. Pls, help me with one if you have. my email is [email protected]
http://www.theserverside.com/tt/books/wiley/masteringEJB3/index.tss
Here's a good free e-book but without Netbean. It covers everything you would need to know about EJBs.
>
Again, is container managed bean good for a big project?
The question is too vague to be answered. It's a design decision that needs more details.

A free ebook for EJB 3.0 with the latest version of Netbean

Hi,
I am a trainee although with a good background in java.
I'm urgently in need of a free ebook for EJB 3.0 with the latest version of Netbean. Pls, help me with one if you have. my email is [email protected]
Again, is container managed bean good for a big project?
Thanks.
Emeka

emekaco wrote:
Hi,
I am a trainee although with a good background in java.
I'm urgently in need of a free ebook for EJB 3.0 with the latest version of Netbean. Pls, help me with one if you have. my email is [email protected]
http://www.theserverside.com/tt/books/wiley/masteringEJB3/index.tss
Here's a good free e-book but without Netbean. It covers everything you would need to know about EJBs.
>
Again, is container managed bean good for a big project?
The question is too vague to be answered. It's a design decision that needs more details.

JNDI Lookup in JSP fails for EJB 3.0

I am new to Java technology. I read the EJB FAQ, NetBeans docs and may forum discussions and I am still confused with the error I am having.
Background:
I have developed a persistance bean and related sessions beans (similar to the customer-cmp-ear application in the Java App Server samples). Now I am trying to access this bean using a JSP. After deploying the war file in the App Server and try to access the page, I get the following error.
javax.naming.NameNotFoundException: No object bound to name java:comp/env/ConsumerSessionLocal
After reading many articles, I understood that I dont have to prepare any descriptors, or JAR files for EJB 3.0.
Environment Details:
Java App Server Ver 9.0
NetBeans 5.5
I normally build the war files using NetBeans.
I use App Server Admin console to deploy the web applications using the above war file.
EJB details:
Persistance EJB : person.java
Session Objects
Consumer.java (this implements ConsumerSessionLocal, ConsumerSessionRemote). This Stateless bean accesses the methods in person.java.
ConsumerSessionLocal.java - local interface
ConsumerSessionRemote.java - remote interface
SearchConsumer.jsp
This JSP page is calling the ConsumerSessionLocal using the JNDI lookup through InitialContext.
Here is the Code snippet:
try {
InitialContext ic = new InitialContext();
Object o = ic.lookup("java:comp/env/ConsumerSessionLocal");
ConsumerSessionLocal consSession = (ConsumerSessionLocal) o;
I am able to see the jsp page in the browser, however, after a submit action, I get the Java Naming Exception error.
javax.naming.NameNotFoundException: No object bound for java:comp/env/ConsumerSessionLocal
I would appreciate your help/any of your thoughts.
Thanks in advance.
-Ram

I did not really solve it. Instead I used some of the tutorials that used JNDI lookup and modified those as my way forward. I did not really find out exactly what I was doing wrong.
/Anders

Error while using LiveCycle java APIs with Http servlets:"Remote EJBObject lookup failed for ejb/Inv

Hi all,
When i try to run more than one servelt of the Quick Start samples that using Livecycle Java APIs and i get an error of "Remote EJBObject lookup failed for ejb/Invocation provider" from any servelt i run.
I try some Quick samples which is not servelts (java class) and it works fine, which makes me sure that my connection properties is true.
Environment:
The LiveCycle is based on "Websphere v6.1", and i use "Eclipse Platform
Version: 3.4.1".
i install "tomcat 5.5.17" to test the servelts in developing time through Eclipse.(only for test in developing time not for deploy on )
The Jars i added in the classpath:
adobe-forms-client.jar
adobe-livecycle-client.jar
adobe-usermanager-client.jar
adobe-utilities.jar
ejb.jar
j2ee.jar
ecutlis.jar
com.ibm.ws.admin.client_6.1.0.jar
com.ibm.ws.webservices.thinclient_6.1.0.jar
server.jar
utlis.jar
wsexception.jar
My code is :
Properties ConnectionProps = new Properties();
ConnectionProps.setProperty(ServiceClientFactoryProperties.DSC_DEFAULT_EJB_ENDPOINT, "iiop://localhost:2809");
ConnectionProps.setProperty ServiceClientFactoryProperties.DSC_TRANSPORT_PROTOCOL,ServiceClientFactoryProperties.DSC_ EJB_PROTOCOL);
ConnectionProps.setProperty(ServiceClientFactoryProperties.DSC_SERVER_TYPE,ServiceClientFa ctoryProperties.DSC_WEBSPHERE_SERVER_TYPE);
ConnectionProps.setProperty(ServiceClientFactoryProperties.DSC_CREDENTIAL_USERNAME, "Administrator");
ConnectionProps.setProperty(ServiceClientFactoryProperties.DSC_CREDENTIAL_PASSWORD, "password");
ConnectionProps.setProperty("java.naming.factory.initial", "com.ibm.ws.naming.util.WsnInitCtxFactory");
//Create a ServiceClientFactory object
ServiceClientFactory myFactory = ServiceClientFactory.createInstance(ConnectionProps);
//Create a FormsServiceClient object
FormsServiceClient formsClient = new FormsServiceClient(myFactory);
//Get Form data to pass to the processFormSubmission method
Document formData = new Document(req.getInputStream());
//Set run-time options
RenderOptionsSpec processSpec = new RenderOptionsSpec();
processSpec.setLocale("en_US");
//Invoke the processFormSubmission method
FormsResult formOut = formsClient.processFormSubmission(formData,"CONTENT_TYPE=application/pdf&CONTENT_TYPE=app lication/vnd.adobe.xdp+xml&CONTENT_TYPE=text/xml", "",processSpec);
List fileAttachments = formOut.getAttachments();
Iterator iter = fileAttachments.iterator();
int i = 0 ;
while (iter.hasNext()) {
Document file = (Document)iter.next();
file.copyToFile(new File("C:\\Adobe\\tempFile"+i+".jp i++;
short processState = formOut.getAction();
...... (To the end of the sample)
My Error was:
com.adobe.livecycle.formsservice.exception.ProcessFormSubmissionException: ALC-DSC-031-000: com.adobe.idp.dsc.net.DSCNamingException: Remote EJBObject lookup failed for ejb/Invocation provider
at com.adobe.livecycle.formsservice.client.FormsServiceClient.processFormSubmission(FormsSer viceClient.java:416)
at HandleData.doPost(HandleData.java:62)
at HandleData.doGet(HandleData.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j ava:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
a

I assume here that your application is deployed on a different physical machine of where LCES is deployed and running.
Do the following test:
- Say that LCES is deployed on machine1 and your application is deployed on machine2. Ping machine1 from machine2 and note the ip address.
- Ping machine1 from machine1 and note the ip address.
The two pings should match.
- Ping machine2 from machine1 and note the ip address.
- Ping machine2 from machine2 and note the ip address.
The two pings should match.
Usually this kind of error would happen if your servers have internal and external ip addresses.

Can't create a JAXB binding for ejb-jar.xml using xjc

Hi all,
I have been trying to build a JAXB binding for EJB deployment descriptors, mainly because I have to update a hand-cranked ejb-jar.xml file on the fly with some additions that have come from a code generator.
I have tried to use
xjc ejb-jar_2_1.xsd j2ee_1_4.xsd ejb-jar_2_1.xsd
xjc on the schema definitions I found at http://java.sun.com/xml/ns/j2ee/ but I can't get it to work. It produces reams of errors, see below for a short extract.
Of course, someone could put me out of my misery and tell me where to find a binding that someone else has done. I can't be the first chimp on the planet that has wanted to do this!
Any help much appreciated.
errors:
[WARNING] warning: "blockDefault" attribute of <schema> is not supported
line 3 of xml.xsd
[WARNING] warning: "finalDefault" attribute of <schema> is not supported
line 3 of xml.xsd
[WARNING] warning: <key> identity constraint will be ignored by JAXB validation
line 117 of j2ee_web_services_client_1_1.xsd
[WARNING] warning: <key> identity constraint will be ignored by JAXB validation
line 115 of ejb-jar_2_1.xsd
[WARNING] warning: <keyref> identity constraint will be ignored by JAXB validation
line 129 of ejb-jar_2_1.xsd
[WARNING] warning: <key> identity constraint will be ignored by JAXB validation
line 145 of ejb-jar_2_1.xsd
[WARNING] warning: <keyref> identity constraint will be ignored by JAXB validation
line 159 of ejb-jar_2_1.xsd

Exception initializing 'oracle.dbtools.raptor.MonitorJDBCAddin' in extension 'Oracle SQL Developer': oracle.classloader.
util.AnnotatedNoClassDefFoundError:
Missing class: oracle.jdbc.OracleDriverThe Oracle driver is not on the classpath.

Difference between narrow() method usage and simple class cast for EJB

Hi,
I have a very simple question:
what is the difference between PortableRemoteObject.narrow(fromObj,
toClass) method usage and simple class cast for EJB.
For example,
1)
EJBObject ejbObj;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)PortableRemoteObject.narrow(ejbObj,ABean.class);
OR
2)
EJBObject bean;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)ejbObj;
Which one is better?
P.S. I'm working with WL 6.1 sp2
Any help would be appreciated.
Thanks in advance,
Orly

[email protected] (Orly) writes:
Hi,
I have a very simple question:
what is the difference between PortableRemoteObject.narrow(fromObj,
toClass) method usage and simple class cast for EJB.
For example,
1)
EJBObject ejbObj;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)PortableRemoteObject.narrow(ejbObj,ABean.class);
OR
2)
EJBObject bean;
// somewhere in the code the home.create() called for bean ...
ABean a = (ABean)ejbObj;
Which one is better?(1) is mandated by the spec. It is required because CORBA systems may
not have sufficient type information available to do a simple case.
P.S. I'm working with WL 6.1 sp2 You should always use PRO.narrow()
andy

How to Define a Data Source in a Standard Way for EJB 3.0?

I have an EJB 3.0 project that I want to deploy to different kinds of servers. I got it to work for OC4J, but when I tried to deploy it to JBoss I found out really quick that there are actually no data sources defined in my EJB Jar and that JDeveloper does not (that I am aware of) define data sources by default in a portable way.
I could be wrong on this. Not sure. Any info for explicitly defining data sources for EJB 3.0 in a portable way would be greatly appreciated.
Thank You,
KurzHome

Frank,
Thanks for your response. I will try that.
One thing I am confused about is how to link the EJB and the data source name. Unless I am missing something obvious, I can't find a configuration setting that explicitly states that my Entity EJB uses XYZ data source (when using OC4J). Where is this defined? Also, what configuration do I add to to my EJB or other file to link it to the JBoss defined data source?
Thanks,
KurzHome

IDE for EJB's

Hi there
I'm looking for IDE's for EJB development.
Best would be if it support UML notation or any other modeling language
if you know any, please let me now
thanks
Thomas

There are quite a few available, you can try Oracle's JDeveloper, you can
download it from oracle for free (evaluation), you can also try ArgoUML,
that you can get from www.sourceforge.net or www.freshmeat.com . It's an
opensource utility written in java that resamlbes Rational Rose. Hope that
helps.
-alex
Thomas Egeter wrote:
Hi there
I'm looking for IDE's for EJB development.
Best would be if it support UML notation or any other modeling language
if you know any, please let me now
thanks
Thomas

Combine Annotation Driven EJB Web Services with BPEL

Hi friends,
We developed two Annotation Driven EJB Web Service and deployed successfully .
webservice 1 accepts username and password as input and returns true if ldap authentication is successful.
webservice 2 accepts username and password,and groupname as input and returns true if user is part of ldap group.
How can we combine these two services in SOA with input (username,password,group) and output (isAuthenticated ,isGroupMember) using BPEL process...
Regards,
jdev

I will create a schema with input as (username,password,group) and Output as (isAuthenticated ,isGroupMember).
Then based on your requirement you have to create either Sync or Async service.
From the BPEL process i will call the 2 webservices using webservice call.
On receiving the result, populate the output variable(isAuthenticated ,isGroupMember) and send as response.
Thanks,
Vijay

Excessive cxs socket connections created for ejb access

We are seeing a large number of TCP connections being created to the cxs engine for ejb access in our application.
We are running iPlanet application server 6.0, sp3 on Solaris 8. We have a web application that accesses a singleton component running in a kjs engine. That singleton accesses cmp entity beans and stateless session beans for serving client requests over the RMI/IIOP bridge. When three clients are connected and making requests, the number of TCP connections to the IIOP port (9010) starts to increase until everything freezes. I believe the "freezing" of the client apps is due to the open socket limit of 1024 being exceeded. According to the developer doc we can increase rlim_fd_max to 8192 to fix that problem.
However, my question is why are there an increasing number of socket connections? We are caching the ejb instances in the singleton so we should not be creating a large pool of EJBs. I have verfied the large number of sockets using netstat and also using RMI runtime logging in the kjs engine.
Does anyone have any ideas what could be happening here?
Thanks,
Mark

I noticed that most of the TCP connections are made to port 32787. Can anyone from iPlanet tell me what is listening on this port? The large number of socket connections is really tying up server resources.
Thanks,
Mark

Help for EJB

Hi,
after I added a busness method in EJB Bean class, I cannot add the method in remote interface.
can anybody help me?
zhou

Yes, you should have an application server for EJB container. Try JBoss; it's free.

Where can i get code for EJB

hi
please tell me where can i get code for EJB 's to create applications

georgemc wrote:
sunil.varma wrote:
hi
please tell me where can i get code for EJB 's to create applicationsCould you make your question more vague pleasehai mr. george.
ejb codez.
iz it good?

Does mapping to JNDI for ejb-refs have a performance impact?

Does mapping to JNDI names for ejb-refs have a performance impact for
WLS6.1?
In the ejb-jar.xml deployment descriptor, you can define an ejb reference as
follows:
<ejb-ref>
<ejb-ref-name>ejb/AccountHomeRemote</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<home>com.package structure.AccountHomeRemote</home>
<remote>com.package structure.AccountRemote</remote>

</ejb-ref>
Now, optionally, you can use the ejb-link element - or - you can, in the
weblogic DD, specify a JNDI name that the ejb-ref maps to.
Using a JNDI name buys you some flexibility. If, for some reason, the jar is
divided, you dont have to convert ejb-link's to JNDI names. The question is:
Is there a performance cost in doing this?
Cheers

Hi Aashish,
Thanks for your quick reply. it was helpful, but i am not using RFC's. Correct me if i am wrong, but i have explained the scenarios in detail below.
Scenario 1. Synchronous
1) PI Picks file from a common folder.
2) PI does a data mapping and sends the data to ECC.
3) ECC contains an inbound interface which receives the data and in which abap proxy code is written.
4) The abap proxy code executes a function module and sends the response as an internal table back to PI.
5) PI receives the response and places it in a text/csv file and places it back to another folder.
I assume that the above would be possible only using BPM. What i understand is that in order for an interface to receive and send data, abstract mappings are to be used, and for this BPM is required. We do not have any conversions etc. its just a simple matter of receiving an internal table from ECC and creating a file to place in the folder.
I also understand that BPM could have bottlenecks due to queue and cache issues, messages might be pending, or lost etc.
Scenario 2. Asynchronous
1) PI Picks file from a common folder.
2) PI does a data mapping and sends the data to ECC.
3) ECC contains an inbound interface which receives the data and in which abap proxy code is written.
4) ABAP Proxy code executes the same function module and calls a seperate outbound interface and passes the values to it. This would be used in sending the response back.
5) PI receives the response from the second interface and places it in a text/csv file and places it back to another folder.
I would like to know which would be the better approach. Documentation/references to support your claims would be much appreciated.
Cheers,
Mz

Annotation for EJB 3

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