EJB or java bean

I have a j2ee application :
- a servlet
- a java bean which access and manipulate oracle database
- JSPs which display results
I would like to know what is the difference between a java bean and an entreprise java bean (EJB) and which is the component more appropriate for my project (an EJB or a java bean) ?
what is better for my project (java bean or an EJB) ? my project is a web application which ask an oracle database and generate an XML file. the user can thanks to this application select the table and the columns he wants and generate an XML file.
Could you help me thank you very much.

If your project is a enterprise level, EJB is preferred, otherwise, java bean is enough.
There is not absolute difference between java bean and EJB. In fact, it's recommended that EJB is called via java bean. There will be too much server side script in the jsp if you call EJB directly in a jsp.

Similar Messages

Difference Betn EJB and Java Bean

what is diference between EJB and Java Bean...???

Is it really necessary to ask the same thing twice??
MeTitus

Expose EJB through Java Bean model importer in Web Dynpro

Hi,
I am planning to expose EJB like following:
1. Create Stateless session bean as a façade for DAO access.
2. Create DAO to access database. In my case is Oracle DB
3. Create Java Bean to encapsulate session bean
4. Import java bean model to web dynpro
Few of my business method return the object array e.g. Customer[] which contains all properties of customer, and getter, setter.
Has anyone done this before? Is there any sample code?
Best Regards,
Zhang Yan

Hi
I think u can refer to the following link
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/java/simple java bean generator for database.pdf
Thought this link is also Useful
Creating and Deploying Web Services for an EJB
Wishes
Krishna kanth

Web Service from an EJB with an Java Bean: createSAXParseException

Hi I am using Together to develop Web Services from an EJB+a Java Bean.
I used the Trader Example, which includes an EJB + a Java Bean.
Running the utility "ant" I get the following exception:
"C:\bea\jdk131\jre\lib\rt.jar;C:\bea\jdk131\lib\rt.jar;c:\bea\wlserver6.1\lib\weblogic.jar;C:\Programme\Together5.5\lib\javax.jar;;"
org.apache.tools.ant.Main
WLS61: Error at line:6 col:12 ':' Already got a ':' in name
WLS61:      at weblogic.xml.babel.baseparser.SAXElementFactory.createSAXParseException(SAXElementFactory.java:60)
WLS61:      at weblogic.xml.babel.parsers.StreamParser.<init>(StreamParser.java:45)
WLS61:      at weblogic.xml.babel.parsers.BabelXMLEventStream.startDocument(BabelXMLEventStream.java:28)
WLS61:      at weblogic.soap.WebServiceProxy.getXMLStream(WebServiceProxy.java:600)
WLS61:      at weblogic.soap.WebServiceProxy.getXMLStream(WebServiceProxy.java:577)
WLS61:      at weblogic.soap.WebServiceProxy.getServiceFrom(WebServiceProxy.java:225)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGenHelper.writeClientJar(WSGenHelper.java:1125)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGenHelper.writeWSDL(WSGenHelper.java:1285)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGenHelper.saveDescriptors(WSGenHelper.java:1418)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGenHelper.output(WSGenHelper.java:1486)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGenHelper.doit(WSGenHelper.java:1520)
WLS61:      at weblogic.ant.taskdefs.ejb.WSGen.execute(WSGen.java:93)
WLS61:      at org.apache.tools.ant.Target.execute(Target.java:153)
WLS61:      at org.apache.tools.ant.Project.runTarget(Project.java:898)
WLS61:      at org.apache.tools.ant.Project.executeTarget(Project.java:536)
WLS61:      at org.apache.tools.ant.Project.executeTargets(Project.java:510)
WLS61:      at org.apache.tools.ant.Main.runBuild(Main.java:421)
WLS61:      at org.apache.tools.ant.Main.main(Main.java:149)
WLS61: Buildfile: build.xml
WLS61:
WLS61: wsgen:
WLS61:
WLS61: BUILD SUCCESSFUL
WLS61:
WLS61: Total time: 7 seconds
WLS61: Finished with 19 Errors, 0 Warnings.

Hi,
try these links
http://www.baigzeeshan.com/2010/11/creating-webservice-from-java-class-in.html
http://www.baigzeeshan.com/2010/11/calling-webservice-in-oracle-adf-by.html
Hope it help,
Zeeshan

Wraping a Java bean in a COM object!

Hello
I am trying to make a Java applet run inside Powerpoint as an ActiveX component.
I am using JavaBeans ActiveX Bridge to convert the applet to a ActiveX component.
However the applet wont work good or not at all inside powerpoint.
I am told that I should write a legal Bean program with the Bridge... I dont know to much about what makes a bean legal.
What I need help with is this and in general. How do I get a java applet inside Office runing and beeing happy
Thanks
//Woodiz

Can anyone help me with the following requirements?
Did you have any idea to call COM component from Java application? Here I have the same problem which is I want to call COM (.dll) component from EJB
(Enterprise Java Bean) Component. So could you help me out or any idea Welcomes.
Thanks in Advance.
[email protected]

Java Bean v/s EJB

Hi All,
Could anyone explain to me what is the difference between a normal Java Bean and an enterprise java bean (EJB). And when would one go for Java Beans and When for an EJB ??
I am a newbie in J2EE. Please Help...
Thanks in advance,
Arun

Its ok man.Refer to the documentaion on the same site. You wil get the ansewrs.
-Kshitij.

Java Beans and EJBs

Hi friends,
I am quite new to Java and am interested in understanding EJBs and their use in deploying distributed applications.
I am not sure if I am supposed to first understand Java Beans before jumping to EJBs. I did read some of the messages under the Java Beans forum page but am confused..please help!!!
Regards,
Ritu

if I am supposed to first understand Java Beans before jumping to EJBsYes! Even before understanding objects and inheritence and so on.

What is the difference between Java Beans and EJBs ?

Hi,
Can someone tell me that ? Kind of confused... Thanks !
Philip

Hmm, I'm gonna have a go at this - hopefully someone will build on it with more differences or requirements:
A Java Bean is merely a Java class written to conform to some simply rules for construction and method naming eg:
public class MyBean
private String myField;
public MyBean()
public void setMyField(String myField)
this.myField = myField;
public String getMyField()
return myField;
}Applications can use Java Beans without having to know about the class in advance - a typical situation might be their use in visual GUI editors where the properties of the bean can be exposed and manipulated by the editor through examination of the method names or an accompanying descriptor.
An Enterprise Java Bean doesn't have all that much in common with a Java Bean. An EJB is a small set of classes meeting a single (usually) business requirement written to conform to the EJB specification. This enables them to be used by J2EE Application servers to perform enterprise business functions (data storage, manipulation, business logic etc.). The whole idea is that by writing to the specification the server can automatically provide support for transaction management, concurrent access, scaleability, etc that a mission-critical system might require without the programmer having to understand the workings of the application server.
Essentially an EJB can either
1) maintain the permanent state of a business object (eg, hold the data for a single product in a catalogue)
2) perform a small set of business operations (eg, place an order for a customer)
3) act in response to messages passed around the system (eg, send a mail to the user when the items have been shipped)
I would have a look at the following two pages to get a better overview:
http://java.sun.com/products/javabeans/
http://java.sun.com/products/ejb/
Hope this helps.

Diff between java beans and EJB

What is Java Bean

http://www.google.co.uk/search?hl=en&q=What+is+Java+Bean&btnG=Google+Search&meta=

Error while running EJB from java client on JBOSS

Hi
As i am new to EJB i have created a helloworld application in ejb which is working fine when i try to call it from servlet but when i try to invoke the same ejb from java client (i.e from diff jvm) on jboss i got the following error:
javax.naming.CommunicationException: Could not obtain connection to any of these urls: localhost:1099 and discovery failed with error: javax.naming.CommunicationException: Receive timed out [Root exception is java.net.SocketTimeoutException: Receive timed out] [Root exception is javax.naming.CommunicationException: Failed to connect to server localhost:1099 [Root exception is javax.naming.ServiceUnavailableException: Failed to connect to server localhost:1099 [Root exception is java.net.ConnectException: Connection refused]]]
     at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1399)
     at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:579)
     at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
     at javax.naming.InitialContext.lookup(InitialContext.java:351)
     at com.gl.TestClient.main(TestClient.java:39)
Caused by: javax.naming.CommunicationException: Failed to connect to server localhost:1099 [Root exception is javax.naming.ServiceUnavailableException: Failed to connect to server localhost:1099 [Root exception is java.net.ConnectException: Connection refused]]
     at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:254)
     at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1370)
     ... 4 more
Caused by: javax.naming.ServiceUnavailableException: Failed to connect to server localhost:1099 [Root exception is java.net.ConnectException: Connection refused]
     at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:228)
     ... 5 more
Caused by: java.net.ConnectException: Connection refused
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
     at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
     at java.net.Socket.connect(Socket.java:519)
     at java.net.Socket.connect(Socket.java:469)
     at java.net.Socket.<init>(Socket.java:366)
     at java.net.Socket.<init>(Socket.java:266)
     at org.jnp.interfaces.TimedSocketFactory.createSocket(TimedSocketFactory.java:69)
     at org.jnp.interfaces.TimedSocketFactory.createSocket(TimedSocketFactory.java:62)
     at org.jnp.interfaces.NamingContext.getServer(NamingContext.java:224)
     ... 5 more
Following is my code:
Home Interface:
package com.gl;
import javax.ejb.CreateException;
public interface testHome extends EJBHome {
     String JNDI_NAME = "testBean";
     public     test create()
     throws java.rmi.RemoteException,CreateException;
Remote Interface:
package com.gl;
import java.rmi.RemoteException;
import javax.ejb.EJBObject;
public interface test extends EJBObject {
     public String welcomeMessage() throws RemoteException;
Bean:
package com.gl;
import java.rmi.RemoteException;
import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class testbean implements SessionBean {
     public void ejbActivate() throws EJBException, RemoteException {
          // TODO Auto-generated method stub
     public void ejbPassivate() throws EJBException, RemoteException {
          // TODO Auto-generated method stub
     public void ejbRemove() throws EJBException, RemoteException {
          // TODO Auto-generated method stub
     public void setSessionContext(SessionContext arg0) throws EJBException,
               RemoteException {
          // TODO Auto-generated method stub
     public void ejbCreate(){}
     public String welcomeMessage(){
          return "Welcome to the World of EJB";
ejb-jar.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>testBean</ejb-name>
<home>com.gl.testHome</home>
<remote>com.gl.test</remote>
<ejb-class>com.gl.testbean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
</ejb-jar>
jboss.xml:
<?xml version='1.0' ?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 3.2//EN" "http://www.jboss.org/j2ee/dtd/jboss_3_2.dtd">
<jboss>
<enterprise-beans>
<entity>
<ejb-name>testBean</ejb-name>
<jndi-name>testBean</jndi-name>
</entity>
</enterprise-beans>
</jboss>
Client code:
package com.gl;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
public class TestClient {
     public static void main(String[] args) throws Exception{
               try{
               /*     Properties props=new Properties();
                    props.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
                    props.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");
                    props.put(Context.PROVIDER_URL, "jnp://localhost:1099");
               Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
props.put(Context.PROVIDER_URL, "localhost:1099");
                    System.out.println("Properties ok");
                    //env.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jboss.naming.HttpNamingContextFactory");
                    //env.put(Context.PROVIDER_URL,"http://localhost:8080");
                    //env.put(Context.SECURITY_PRINCIPAL, "");
                    //env.put(Context.SECURITY_CREDENTIALS, "");
                    Context ctx=new InitialContext(props);
                    System.out.println("context ok");
                    //testHome home = (testHome)ctx.lookup("testBean");
                    Object obj = ctx.lookup ("testBean");
                    System.out.println("ojb = " + obj);
                    testHome ejbHome = (testHome)PortableRemoteObject.narrow(obj,testHome.class);
               test ejbObject = ejbHome.create();
               String message = ejbObject.welcomeMessage();
                    System.out.println("home ok");
                    System.out.println("remote ok");
                    System.out.println(message);
                    catch(Exception e){e.printStackTrace();}
I am able to successfully deployed my ejb on JBOSS but i m getting above error when i am trying to invoke ejb from java client.
kindly suggest me something to solve this issue.
Regards
Gagan
Edited by: Gagan2914 on Aug 26, 2008 3:28 AM

Is it a remote lookup? Then maybe this will help:
[http://wiki.jboss.org/wiki/JBoss42FAQ]
- Roy

Problems with a java bean in Weblogic 5.1

Hello,
          I am having a problem deploying a java bean in Weblogic 5.1:
          I have been given a .class and a .jar file for a java bean (not an EJB). I
          placed the .class file into e:\temp\WEB-INF\classes and added the following
          line to my weblogic.properties file:
          weblogic.httpd.webApp.testApp=e:/temp/
          I have also updated the web.xml file in the WEB-INF directory as follows:
          <?xml version="1.0" encoding="UTF-8"?>
          <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web
          Application 1.2//EN"
          "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
          <web-app>
          <servlet>
          <servlet-name>EdIface</servlet-name>
          <jsp-file>test.jsp</jsp-file>
          </servlet>
          <servlet-mapping>
          <servlet-name>EdIface</servlet-name>
          <url-pattern>EdIface</url-pattern>
          </servlet-mapping>
          </web-app>
          When I try to access my http:\\server:port\testApp\test I get an "Error
          500 - internal server error".
          Has anyone had experice with deploying a java bean with jsut the .class and
          .jar file? Where should I put the .jar file?
          I appreciate any advice!


Bump

Crystal Reports data connection using Java beans

Hi
My name is Bach Ong, i'm currently perform re-configuring Crystal reports 2008 to connect via
Java bean to Jboss server, this uses look up service on JBoss server. The connection is using Connect
look up using the properties:
java.naming.provider.url=jnp://emgsydapp121:10499
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
for file CRConfig.xml i put as follows:
<JDBCURL></JDBCURL>
<JDBCClassName></JDBCClassName>
<JDBCUserName></JDBCUserName>
<JNDIURL>jnp://emgsydapp121:10499</JNDIURL>
<JNDIConnectionFactory>org.jnp.interfaces.NamingContextFactor
y</JNDIConnectionFactory>
<JNDIInitContext>/</JNDIInitContext>
<JNDIUserName></JNDIUserName>
Can you advise us if this step is correct, and is there any
documentation that can guide us to right direction.
for Java testing in Eclipse using remote call class it is working suing the following code:
        Properties p = new Properties();
        p.put(Context.INITIAL_CONTEXT_FACTORY,
        "org.jnp.interfaces.NamingContextFactory");
        p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
        p.put(Context.PROVIDER_URL, "jnp://emgsydapp121:10499");
         InitialContext ctx = new InitialContext(p);
Date asAtDate = CrystalUtils.convertToDate("2014-01-01", CrystalUtils.relativeToToday(0), false);
     String asxCode = "BHP";
     ClosingPricesReportRequest criteria = new ClosingPricesReportRequest(asAtDate, asxCode);
     InitialContext context = new InitialContext(p);
     ClosingPricesReportService ejb = (ClosingPricesReportService) context.lookup(ClosingPricesReportService.REMOTE_JNDI);
     ClosingPricesReport report = ejb.createMTMClosingPriceReport(criteria);
     System.out.println(report.getClosingPrices()[0].getClosingPrice());
     testval = report.getClosingPrices()[0].getClosingPrice().toString();
     System.out.println(testval);
when i run the tes code the results as follow:
10:49:45,244 DEBUG [SecurityAssociation ] Using ThreadLocal: false
10:49:45,338 DEBUG [MicroSocketClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] constructed
10:49:45,338 DEBUG [MicroRemoteClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] connecting
10:49:45,338 DEBUG [MicroSocketClientInvoker ] Creating semaphore with size 50
10:49:45,338 DEBUG [MicroRemoteClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] connected
10:49:45,369 DEBUG [ClientSocketWrapper ] reset timeout: 0
10:49:45,650 DEBUG [InvokerRegistry ] removed SocketClientInvoker[709446e4, socket://emgsydapp121:10473] from registry
10:49:45,650 DEBUG [MicroSocketClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] disconnecting ...
10:49:45,650 DEBUG [SocketWrapper ] ClientSocketWrapper[Socket[addr=/10.137.2.40,port=10473,localport=64150].2cba5bdb] closing
37.99000000000000198951966012828052043914794921875
37.99000000000000198951966012828052043914794921875
Can anyone assist me in convert the above settings to get access by Crystal reports.
My attemp current are below:
public class CFDClosingPricesRpt extends CrystalReport {
    //Constructor
    public CFDClosingPricesRpt(){
        super(ClosingPriceBean.INSTANCE);
     * Returns the ResultSet for this report to Crystal.
     * @param asxCode
     * @param asAtDateString
     * @return
public ResultSet getNewReport(String asxCode, String asAtDateString) {
     try {
         Properties p = new Properties();
         p.put(Context.INITIAL_CONTEXT_FACTORY,
         "org.jnp.interfaces.NamingContextFactory");
         p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
         p.put(Context.PROVIDER_URL, "jnp://emgsydapp121:10499");
         //InitialContext ctx = new InitialContext(p);
         clearCachedReportBeans();
   Date asAtDate = CrystalUtils.convertToDate("2013-01-01", CrystalUtils.relativeToToday(0), false);
      asxCode = "BHP";
      ClosingPricesReportRequest criteria = new ClosingPricesReportRequest(asAtDate, asxCode);
      //ClosingPricesReportService ejb = (ClosingPricesReportService) ctx.lookup(ClosingPricesReportService.REMOTE_JNDI);
      ClosingPricesReportService ejb = (ClosingPricesReportService) ServiceLocator.getInstance().getService(ClosingPricesReportService.REMOTE_JNDI);
      ClosingPricesReport report = ejb.createClosingPriceReport(criteria);
      // assemble Crystal-friendly DTO
      Collection closingPrices = Arrays.asList(report.getClosingPrices());
      for (Iterator iter = closingPrices.iterator(); iter.hasNext();) {
                MBLXClosingPrice cp = (MBLXClosingPrice) iter.next();
                if (cp==null) continue;
                addReportBean(new ClosingPriceBean( report.getSuppliedDate(),
                            cp.getClosingPrice(),
                            cp.getAsxCode()));
} catch (Throwable x) {
      saveErrorMessage(x);
return getAsResultSet();
Thanks
Bach Ong

Hi Don Thanks for the reply.
I've was able to connect via Java beans and JNDI. But this one is going the JNDI of JBoss sever, which the JNDI already configure and working for Crystal reports v10.
Bach

How to pass a populated Java bean to a jsp

Hi,
I'm new to J2EE world. I want to know how should I pass a populated Java Bean (not EJB) to a JSP without displaying that JSP in the next step. I would be much grateful to anyone who gives a solution to my problem.
Thanks in advance
With best regards
Sampath

> I'm new to J2EE world. I want to know how should I
pass a populated Java Bean (not EJB) to a JSP without
displaying that JSP in the next step.
Urk?
A JSP is meant to be displayed. If there's business logic in that JSP, get it out of there. Process the bean as needed on the server side and send the flow on to some view that actually should be displayed.
~

Importing Java Bean Model in Webdynpro Development Component

Hi All,
Is there any simple tutorial, example to import java bean model in webdynpro development component.
I am using NWDS 7.0 SP14 and WAS 7.0.
it really helps if you can provide simple EJB as a development component with details how to create a public part and using this bean as java bean model in Webdynpro development component.
what are the steps to be followed with precautions
Thanks in Advance,
Murali

Hi,
[Using the Java Bean Model in Web Dynpro|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/4072c0d0-c21e-2b10-ab84-e2c183d355de]
[Using EJBs in Web Dynpro|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c]
you will get more if you search in the forum.
more help on EJB's
Re: Help needed in EJB
http://help.sap.com/saphelp_nw70/helpdata/EN/19/f9bc3d8af79633e10000000a11405a/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/70929198-0d36-2b10-04b8-84d90fa3df9c
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c
PradeeP

J2EE Java Beans and JSP

I need a little help. I would like to learn jsp programming. Ive been browsing lots of tutorials on net but i didnt find any way how to use your own classes in jsp. I suppose it could do something with Java Beans but im new them so i dont know. Lets say ive got a login form with a username and password. After i send it to another jsp lets say verify.jsp i would like to verify the user using a class ive got. It goes through a xml file with some accounts and looks for the desired user if the password is correct. Now how do i call a method: boolean verifyUser( String user, String password) in the verify.jsp file? Is it possible?
Thanks for help

you'll probably want to have a central servlet that all your JSPs will talk to and acts as a traffic cop to direct navigation between pages. it can be the one to add JavaBeans as attributes to page/request/session/application scope. Your JSP can then get the Bean as an atribute and call its isValid method.
Java Beans are NOT Enterprise Java Beans. Be sure you understand the difference. The former are Java objects that follow Bean conventions; the latter are Java objects that extend EJB types and run in a container. Very different.
%

EJB or java bean

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