EJB - Applet

I am trying to access a Business Component (deployed as a EJB on
9ias) using an Applet.
I used Jdev 9i to create a sample Jclient(JApplet) and it works
fine but only if it runs as an application.
Infact when I use applet I receive this message by Java Plug In
Console:
oracle.jbo.common.ampool.ApplicationPoolException: JBO-30003:
The application pool, PrBC.DM, failed to checkout an application
module instance.
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1143)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
## Detail 0 ##
oracle.jbo.JboException: JBO-25222: Unable to create application
module.
 at
oracle.jbo.common.ampool.DefaultConnectionStrategy.createApplicat
ionModule(DefaultConnectionStrategy.java:63)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createInstance
(ApplicationPoolImpl.java:1596)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createNewInstance
(ApplicationPoolImpl.java:1582)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1137)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
## Detail 0 ##
javax.naming.NoInitialContextException: Cannot instantiate
class: com.evermind.server.rmi.RMIInitialContextFactory. Root
exception is java.lang.ClassNotFoundException:
java.io.IOException: open HTTP connection failed.
 at sun.applet.AppletClassLoader.getBytes(Unknown Source)
 at sun.applet.AppletClassLoader.access$100(Unknown
Source)
 at sun.applet.AppletClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native
Method)
 at sun.applet.AppletClassLoader.findClass(Unknown Source)
 at sun.plugin.security.PluginClassLoader.findClass
(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.applet.AppletClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClassInternal(Unknown
Source)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Unknown Source)
 at com.sun.naming.internal.VersionHelper12.loadClass
(Unknown Source)
 at javax.naming.spi.NamingManager.getInitialContext
(Unknown Source)
 at javax.naming.InitialContext.getDefaultInitCtx(Unknown
Source)
 at javax.naming.InitialContext.init(Unknown Source)
 at javax.naming.InitialContext.<init>(Unknown Source)
 at
oracle.jbo.client.remote.ejb.ias.AmHomeImpl.initRemoteHome
(AmHomeImpl.java:75)
 at oracle.jbo.client.remote.ejb.ias.AmHomeImpl.<init>
(AmHomeImpl.java:38)
 at
oracle.jbo.client.remote.ejb.ias.InitialContextImpl.createJboHome
(InitialContextImpl.java:17)
 at oracle.jbo.common.JboInitialContext.lookup
(JboInitialContext.java:72)
 at javax.naming.InitialContext.lookup(Unknown Source)
 at
oracle.jbo.common.ampool.DefaultConnectionStrategy.createApplicat
ionModule(DefaultConnectionStrategy.java:45)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createInstance
(ApplicationPoolImpl.java:1596)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createNewInstance
(ApplicationPoolImpl.java:1582)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1137)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
oracle.jbo.JboException: JBO-29000: Unexpected exception caught:
oracle.jbo.common.ampool.ApplicationPoolException, msg=JBO-
30003: The application pool, PrBC.DM, failed to checkout an
application module instance.
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:377)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
## Detail 0 ##
oracle.jbo.common.ampool.ApplicationPoolException: JBO-30003:
The application pool, PrBC.DM, failed to checkout an application
module instance.
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1143)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
## Detail 0 ##
oracle.jbo.JboException: JBO-25222: Unable to create application
module.
 at
oracle.jbo.common.ampool.DefaultConnectionStrategy.createApplicat
ionModule(DefaultConnectionStrategy.java:63)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createInstance
(ApplicationPoolImpl.java:1596)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createNewInstance
(ApplicationPoolImpl.java:1582)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1137)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
## Detail 0 ##
javax.naming.NoInitialContextException: Cannot instantiate
class: com.evermind.server.rmi.RMIInitialContextFactory. Root
exception is java.lang.ClassNotFoundException:
java.io.IOException: open HTTP connection failed.
 at sun.applet.AppletClassLoader.getBytes(Unknown Source)
 at sun.applet.AppletClassLoader.access$100(Unknown
Source)
 at sun.applet.AppletClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native
Method)
 at sun.applet.AppletClassLoader.findClass(Unknown Source)
 at sun.plugin.security.PluginClassLoader.findClass
(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.applet.AppletClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClassInternal(Unknown
Source)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Unknown Source)
 at com.sun.naming.internal.VersionHelper12.loadClass
(Unknown Source)
 at javax.naming.spi.NamingManager.getInitialContext
(Unknown Source)
 at javax.naming.InitialContext.getDefaultInitCtx(Unknown
Source)
 at javax.naming.InitialContext.init(Unknown Source)
 at javax.naming.InitialContext.<init>(Unknown Source)
 at
oracle.jbo.client.remote.ejb.ias.AmHomeImpl.initRemoteHome
(AmHomeImpl.java:75)
 at oracle.jbo.client.remote.ejb.ias.AmHomeImpl.<init>
(AmHomeImpl.java:38)
 at
oracle.jbo.client.remote.ejb.ias.InitialContextImpl.createJboHome
(InitialContextImpl.java:17)
 at oracle.jbo.common.JboInitialContext.lookup
(JboInitialContext.java:72)
 at javax.naming.InitialContext.lookup(Unknown Source)
 at
oracle.jbo.common.ampool.DefaultConnectionStrategy.createApplicat
ionModule(DefaultConnectionStrategy.java:45)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createInstance
(ApplicationPoolImpl.java:1596)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.createNewInstance
(ApplicationPoolImpl.java:1582)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout
(ApplicationPoolImpl.java:1137)
 at
oracle.jbo.common.ampool.ApplicationPoolImpl.useApplicationModule
(ApplicationPoolImpl.java:1828)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:273)
 at
oracle.jbo.common.ampool.SessionCookieImpl.useApplicationModule
(SessionCookieImpl.java:253)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:354)
 at
oracle.jbo.uicli.mom.JUMetaObjectManager.createApplicationObject
(JUMetaObjectManager.java:331)
 at pack_BC.AppletFunzionalita.init
(AppletFunzionalita.java:54)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
My code in the applet java class is:
package pack_BC;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import oracle.jbo.*;
import javax.naming.*;
import oracle.jbo.uicli.mom.JUMetaObjectManager;
import oracle.jbo.uicli.binding.JUApplication;
import oracle.jbo.uicli.controls.*;
import oracle.jbo.uicli.jui.*;
import java.util.Hashtable;
public class AppletFunzionalita extends JApplet
// frame layout
private BorderLayout borderLayout = new BorderLayout();
// layout panel definition
private LYPanelFunzionalita layoutPanel;
// the statusbar
private JUStatusBar statusBar = new JUStatusBar();
* the default constructor
public AppletFunzionalita()
public void init()
try
// bootstrap application
java.util.Properties props = new java.util.Properties();
props.put(JboContext.USE_APPLET, this);
JUApplication app =
JUMetaObjectManager.createApplicationObject("PrBC.DM", props);
app.setErrorHandler(new JUErrorHandlerDialog());
app.setErrorHandlerActive(true);
layoutPanel = new LYPanelFunzionalita();
jbInit();
catch(Exception ex)
ex.printStackTrace();
public void stop()
_popupTransactionDialog();
public void destroy()
layoutPanel.getPanelBinding().getApplicationModule
().getTransaction().disconnect();
* the JbInit method
public void jbInit() throws Exception
// frame layout
this.getContentPane().setLayout(borderLayout);
this.getContentPane().add(layoutPanel, BorderLayout.CENTER);
statusBar.setModel(JUStatusBar.getModelInstance
(layoutPanel.getPanelBinding(), statusBar));
this.getContentPane().add(statusBar, BorderLayout.SOUTH);
public static void main(String [] args)
// run this frame
JFrame frame = new JFrame();
frame.setSize(300, 400);
JApplet applet = new AppletFunzionalita();
frame.getContentPane().add(applet);
applet.init();
applet.start();
Dimension screenSize = Toolkit.getDefaultToolkit
().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height)
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width)
frameSize.width = screenSize.width;
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
private void _popupTransactionDialog()
if (layoutPanel.getPanelBinding().getApplicationModule
().getTransaction().isDirty())
Object [] options = {"Commit", "Rollback"};
int action = JOptionPane.showOptionDialog(null, "How do
you want to close the transaction.", "Transaction open",
JOptionPane.YES_NO_OPTION, JOptionPane.INFORMATION_MESSAGE,
null, options, options[0]);
switch (action)
case JOptionPane.NO_OPTION:
case JOptionPane.CLOSED_OPTION:
layoutPanel.getPanelBinding().getApplicationModule
().getTransaction().rollback();
break;
case JOptionPane.YES_OPTION:
default:
layoutPanel.getPanelBinding().getApplicationModule
().getTransaction().commit();
break;

same problem

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-Muni

Oh I am sorry if my question was very bossy ;-(
The problem is I have gone through all tutorials of Java starting from Swing, AWT, EJB, Applet and so on. And I am confused which one to use as such.
Also this type of application or program I have used extensively from other vendors which looks quite good!

EJB 3.0 - Communicate an Applet with a Session Bean

Hello
I'm developing an EJB 3.0 app (eclipse and glassfish tools bundle), and I have an applet that has to use remote session beans.
QUESTION: Is it possible for the applet to connect to EJB?
QUESTION: By creating a J2EE application client project, can I use @EJB annotations to inject the session bean directly to the applet, avoiding the JNDI lookup?
(since I imagine that the anwser to the second one is NO, I do the following consideration)
Given an application client project, I imagine that this application can run remotely on a client machine/JRE. Then this application can use Annotations/injection facilities whenever it runs on a J2EE client container (which I assume consists of a set of libraries provided by the application server vendor, Glassfish in that case). Could this application be deployed using Java Web Start? If so, why can't it be deployed as an applet? (both options run in a client JRE, don't they?).
QUESTION: In either case (applet or JWS), how do I have to package the JAR file (using Eclipse) so that it contains the needed libraries for accessing the EJB? Which are those libraries?
At the time being, I'm trying to implement a sample application that follows the "Applet doing JNDI lookup" approach. I have:
- an EAR project
- an EJB project (containing an Entity Bean and a Stateless Session Bean with a @Remote interface)
@Remote
public interface HelloRemote {
 public String hello(String name);
@Stateless
public class Hello implements HelloRemote {
 @Override
 public String hello(String name) {
 return "Hello "+name+"!!";
}- an Application Client project (containing the applet code):
public class ClientApplet extends JApplet {
 public void init(){
 try {
 Context jndiContext = getInitialContext( );
 HelloRemote server = (HelloRemote) jndiContext.lookup(HelloRemote.class.getName());
 setContentPane(new JLabel(server.hello("Gerard")));
 } catch (NamingException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 private Context getInitialContext() throws NamingException{
 Properties props = new Properties();
 props.setProperty("java.naming.factory.initial", "com.sun.enterprise.naming.SerialInitContextFactory");
 props.setProperty("org.omg.CORBA.ORBInitialHost", "myhost");
 props.setProperty("org.omg.CORBA.ORBInitialPort", "3700");
 return new InitialContext(props);
}- a static web project (with a sample web page that contains the applet object the corresponding applet JAR file)
I tried to export the Application Client project as an "application client JAR", in the hope that the java EE libraries bundled with glassfish (listed as libraries of this project) would be packaged too.
No success, so now I'll try to copy all the JAR files (one by one) into the +\WebContent\+ folder of the Web Project, and add references to each of them in the archive="" attribute of the +<applet>+ HTML tag. Although this might work, I suspect that I am missing the good/easy way of doing it. Any suggestions?
Thanks in advance,
Gerard
Edited by: gsoldevila on May 6, 2009 7:09 AM

An Applet can communicate with an EJB via JNDI lookup but I would (personally) use an intermediate Servlet to handle this. Client to Servlet communication is http whereas to ejb is iiop - which might be blocked.
Injection only works in managed classes (EJB, Servlet, Listeners..) and an Application Client main class. So yes you could use an app client for handling resource injection.
m

Calling EJB from an applet in 9iAS Release 2?

Hello!
In 9iAS Release 1 it is not so easy to call an EJB from an applet. First the applet needs special privileges and then the applet starts only once. The cause of problem is the implementation of ormi.
Will 9iAS Rel. 2 support Applets calling EJBs?

Jeff,
I am also trying to make an applet client for an EJB deployed to OC4J.
I modified the java2.policy file as you suggested, but when I tried to run my applet, I
got the following error:
java.lang.ExceptionInInitializerError: java.security.AccessControlException: access denied (java.util.PropertyPermission tunneling.shortcut read)
 at java.security.AccessControlContext.checkPermission(Unknown Source)
 at java.security.AccessController.checkPermission(Unknown Source)
 at java.lang.SecurityManager.checkPermission(Unknown Source)
 at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
 at java.lang.System.getProperty(Unknown Source)
 at java.lang.Boolean.getBoolean(Unknown Source)
 at com.evermind.server.rmi.RMIInitialContextFactory.<clinit>(RMIInitialContextFactory.java:34)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Unknown Source)
 at com.sun.naming.internal.VersionHelper12.loadClass(Unknown Source)
 at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
 at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
 at javax.naming.InitialContext.init(Unknown Source)
 at javax.naming.InitialContext.<init>(Unknown Source)
 at its.fnd.ejb.EJBHomeFinder.getHomeObject(Unknown Source)
 at its.fnd.flight.ejb.EJBFlightFactory.<init>(Unknown Source)
 at its.fnd.flight.FlightFactory.<init>(FlightFactory.java:97)
 at EJBApplet.jbInit(EJBApplet.java:47)
 at EJBApplet.init(EJBApplet.java:36)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
I am using OC4J (stand-alone) version 9.0.2.0.0 on Solaris 7 and Microsoft Internet Explorer
5.0 with the java 1.3.1 plug-in.
Here is the applet code that I use to lookup the EJB home interface:
Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY,"com.evermind.server.rmi.RMIInitialContextFactory");
props.put(Context.PROVIDER_URL,"ormi://host:6666/app");
props.put(Context.SECURITY_PRINCIPAL,"admin");
props.put(Context.SECURITY_CREDENTIALS,"password");
Context ctxt = new InitialContext(props);
Object homeObj = ctxt.lookup("my_bean");
MyBeanHome home = PortableRemoteObject.narrow(homeObj, MyBeanHome.class);
The HTML page with the <applet> tag is a static HTML page that is part of OC4J's default
web application. The applet class file is located in a subdirectory of the default-web-app
directory. Here is the HTML page...
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
<TITLE>
HTML Test Page
</TITLE>
</HEAD>
<BODY>
<object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" width="580" height="450" name="EJBApplet" align="middle" alt="Loading EJBApplet ...">
<param name="java_code" value="EJBApplet">
<param name="java_codebase" value="/tests">
<param name="java_archive" value="xerces.jar,ejb.jar,oc4j.jar,jaas.jar"/>
<param name="java_type" value="application/x-java-applet;version=1.3">
<param name="java_scriptable" value="true">
<table cellpadding="1" bgcolor="#FFFFFF" width="580" height="450">
<tr><td>
This is a place for an APPLET. Your browser doesn't support the correct applet java plug-in. You can install the correct plug-in from here. <a target='_blank' onClick='javascript:self.window.close()' href="/classes/3rdparty/j2re-win-plug-in.exe">Click here to install plug-in.</a> Or if you have an Internet connection you can install the correct plug-in from here. <a target='_blank' onClick='javascript:self.window.close()' href="http://java.sun.com/products/plugin/1.3/plugin-install.html">Click here to install plug-in from Internet.</a> You can call your System Administrator for assistance.</td></tr>
</table>
</object>
</BODY>
</HTML>
I have searched the Internet, and the documentation, and tried several, different things,
but I can't get it to work.
Any and all help will be greatly appreciated.
Thanks,
Sofia.

Applet EJB Coomunication

Hi,
I am trying the applet ejb communication .
I am very comfortable if I do the same with applet servlet communication but the problem is with the applet calling the ejb directly, i mean to say that can applet can directly lookup the EJB ?
I had tried on the intranet but we are supposed to give the HOme and remote files to the client also the ejb.jar has to be given as the JVM of the clinet doesnot have the javax.ejb package and all relevant pacakages are to be given,
There is no meaning of making the client EJB compitable.
Also what about the security ?
So can any body help me how to do the same.
Thanks in advance.
Milind

Remove ur applet ejb communication by
applet to servlet/serverside class then from that servlet/serverside clas to ejb..
This concept is done by a pattern called 'business delegate'.
By using this approach u need not give the stub and skull to the front end side (jsp/applet/or anything like that).
just call the servlet/class from the applet by keeping that class as passover and thereby the lookup details are moved to that servlet/class that could resolve your problem..
does my answer make any sense to u..

Accesing an EJB from an Applet

Hello,
I've published my first EJB to Oracle 8i, and when I use a
standalone java application as a client I have no problems.
But when I try to access with an Applet, the Java console shows:
javax.naming.NotContextException:
retvalentin09.cedetel.tel.uva.es:2481:ORCL/test/MyEJBRemote
The code I use to connect to the EJB is the same as in the
standalone application:
Hashtable env = new Hashtable();
System.out.println("Inicializando entorno...");
env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
env.put(Context.SECURITY_PRINCIPAL, "valentin");
env.put(Context.SECURITY_CREDENTIALS, "valentin");
env.put(Context.SECURITY_AUTHENTICATION,
ServiceCtx.NON_SSL_LOGIN);
System.out.println("Inicializado");
try{
Context ic = new InitialContext(env);
System.out.println("Contexto inicial creado");
MyEJBHome home = (MyEJBHome)
ic.lookup("sess_iiop://retvalentin09.cedetel.tel.uva.es:2481:ORCL
/test/MyEJBRemote");
System.out.println("Obtenido home Interface");
try{
try{
MyEJBRemote holaBean = home.create(); // create a
bean instance
System.out.println("Obtenida referencia a EJB");
System.out.println("Resultado: "+holaBean.DimeHola());
} catch (java.rmi.RemoteException
RE){System.out.println("Excepcion remota: "+RE);}
}catch (javax.ejb.CreateException
CE){System.out.println("Excepcion de creacion: "+CE);}
}catch (javax.naming.NamingException
nE){System.out.println("Excepcion de nombrado: "+nE);}
System.out.println("Finalizado");
What is going wrong? I use Java Plugin 1.2.2 in the
navigator, perhaps that is the problem.
I've tried to compile the applet in JDeveloper 2.0 with JDK
1.1.7, but the Netscape Communicator throws Security Exceptions
(I think the JVM of the navigator is 1.1.5), and it happens the
same with Internet Explorer.
I've tried to compile the applet in JDevelper 2.0 whit JDK 1.2,
and in both Communicator and Explorer the Java Console shows this
messages:
Java(TM) Plug-in: Version 1.2.2.pu
Using JRE version 1.2.2
User home directory = C:\WINNT\Profiles\Administrador
Proxy Configuration: Manual Configuration
Proxy: http=proxy.uva.es:80
Proxy Overrides:
JAR cache disabled.
Inicializando entorno...
Inicializado
Contexto inicial creado
Excepcion de nombrado: javax.naming.NotContextException:
retvalentin09.cedetel.tel.uva.es:2481:ORCL/test/MyEJBRemote
Finalizado
I would appreciate if somebody could help me, as it is very
urgent.
Thanks in advance
Valentin
null

Hi
Oracle8i comes with set of samples. One of sample is accessing an
EJB from applet. check out demo.tar/demo.zip file
$ORACLE_HOME/javavm/demo directory.
You will find it useful.
regards
raghu
Valentin Alonso (guest) wrote:
: Hello,
: I've published my first EJB to Oracle 8i, and when I use a
: standalone java application as a client I have no problems.
: But when I try to access with an Applet, the Java console
shows:
: javax.naming.NotContextException:
: retvalentin09.cedetel.tel.uva.es:2481:ORCL/test/MyEJBRemote
: The code I use to connect to the EJB is the same as in the
: standalone application:
: Hashtable env = new Hashtable();
: System.out.println("Inicializando entorno...");
: env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
: env.put(Context.SECURITY_PRINCIPAL, "valentin");
: env.put(Context.SECURITY_CREDENTIALS, "valentin");
: env.put(Context.SECURITY_AUTHENTICATION,
: ServiceCtx.NON_SSL_LOGIN);
: System.out.println("Inicializado");
: try{
: Context ic = new InitialContext(env);
: System.out.println("Contexto inicial creado");
: MyEJBHome home = (MyEJBHome)
ic.lookup("sess_iiop://retvalentin09.cedetel.tel.uva.es:2481:ORCL
: /test/MyEJBRemote");
: System.out.println("Obtenido home Interface");
: try{
: try{
: MyEJBRemote holaBean = home.create(); // create a
: bean instance
: System.out.println("Obtenida referencia a EJB");
: System.out.println("Resultado:
"+holaBean.DimeHola());
: } catch (java.rmi.RemoteException
: RE){System.out.println("Excepcion remota: "+RE);}
: }catch (javax.ejb.CreateException
: CE){System.out.println("Excepcion de creacion: "+CE);}
: }catch (javax.naming.NamingException
: nE){System.out.println("Excepcion de nombrado: "+nE);}
: System.out.println("Finalizado");
: What is going wrong? I use Java Plugin 1.2.2 in the
: navigator, perhaps that is the problem.
: I've tried to compile the applet in JDeveloper 2.0 with JDK
: 1.1.7, but the Netscape Communicator throws Security Exceptions
: (I think the JVM of the navigator is 1.1.5), and it happens the
: same with Internet Explorer.
: I've tried to compile the applet in JDevelper 2.0 whit JDK 1.2,
: and in both Communicator and Explorer the Java Console shows
this
: messages:
: Java(TM) Plug-in: Version 1.2.2.pu
: Using JRE version 1.2.2
: User home directory = C:\WINNT\Profiles\Administrador
: Proxy Configuration: Manual Configuration
: Proxy: http=proxy.uva.es:80
: Proxy Overrides:
: JAR cache disabled.
: Inicializando entorno...
: Inicializado
: Contexto inicial creado
: Excepcion de nombrado: javax.naming.NotContextException:
: retvalentin09.cedetel.tel.uva.es:2481:ORCL/test/MyEJBRemote
: Finalizado
: I would appreciate if somebody could help me, as it is very
: urgent.
: Thanks in advance
: Valentin
null

Applets to EJB Cluster

Hi,
          Is the following true? If so what is the recommended way to load balance
          EJB calls from applets?
          Since applets (not signed) can only create a connection to the server they
          where downloaded from, I can not call EJBs that reside in a WL cluster.
          These EJBs may reside on a different machine other than the one the applet
          was downloaded from.
          Can I solve this by installing a Web Server on each of the machines in the
          cluster and have the applets stick the one machine? What I do not like
          about this scheme is that I loose the dynamic load balancing features of WL.
          Any help will be appreciated,
          Assaf Pazner


               The WLS RJVM scheme supports routing / session concentration of
          request. Thus, using clustered services within the applet security
          model or over a firewall should work fine. The server that the applet
          talks to will route requests to the appropriate server within the
          cluster.
                                        - Mike
          Assaf Pazner wrote:
          >
          > Hi,
          >
          > Is the following true? If so what is the recommended way to load balance
          > EJB calls from applets?
          >
          > Since applets (not signed) can only create a connection to the server they
          > where downloaded from, I can not call EJBs that reside in a WL cluster.
          > These EJBs may reside on a different machine other than the one the applet
          > was downloaded from.
          >
          > Can I solve this by installing a Web Server on each of the machines in the
          > cluster and have the applets stick the one machine? What I do not like
          > about this scheme is that I loose the dynamic load balancing features of WL.
          >
          > Any help will be appreciated,
          > Assaf Pazner

EJB - Applet

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