Accessing EJB from an Applet

Hi
I m new to Application servers and EJBs. I have successfully deployed a small EJB in Oracle9i AS. Now I want to write an client to access the EJB. I want the client to be an Applet. But i have found that the applet works only if certain permissions are granted in the client machine
Is there any way by which i can write an Applet that can access an EJB without making any changes in the client machine.
The code I use in the applet is given below.
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.ApplicationClientInitialContextFactory");
env.put(Context.PROVIDER_URL, "ormi://solomon:23791/helloEjb");
env.put("java.naming.security.principal", "admin");
env.put("java.naming.security.credentials", "welcome");
Context ic = new InitialContext (env);
HelloHome hello_home = (HelloHome)ic.lookup ("java:comp/env/helloServer.HelloBean");
Hello hello = hello_home.create ();
System.out.println (hello.helloWorld ());
The Exception i get while running the Applet without making any changes in the client machine is...
java.security.AccessControlException: access denied (java.util.PropertyPermission localhostIsAdmin read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
at java.security.AccessController.checkPermission(AccessController.java:399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1278)
at java.lang.System.getProperty(System.java:599)
at com.evermind.server.ApplicationClientInitialContextFactory.getInitialContext(ApplicationClientInitialContextFactory.java:156)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:668)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)
at javax.naming.InitialContext.init(InitialContext.java:222)
at javax.naming.InitialContext.<init>(InitialContext.java:198)
at TrialApplet.init(TrialApplet.java:51)
at sun.applet.AppletPanel.run(AppletPanel.java:344)
at java.lang.Thread.run(Thread.java:484) Process Exit...
If i use "com.evermind.server.rmi.RMIInitialContextFactory" instead of "com.evermind.server.ApplicationClientInitialContextFactory" the Exception is ..
java.security.AccessControlException: access denied (java.util.PropertyPermission localhostIsAdmin read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
at java.security.AccessController.checkPermission(AccessController.java:399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1278)
at java.lang.System.getProperty(System.java:599)
at com.evermind.server.ApplicationClientInitialContextFactory.getInitialContext(ApplicationClientInitialContextFactory.java:156)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:668)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)
at javax.naming.InitialContext.init(InitialContext.java:222)
at javax.naming.InitialContext.<init>(InitialContext.java:198)
at TrialApplet.init(TrialApplet.java:51)
at sun.applet.AppletPanel.run(AppletPanel.java:344)
at java.lang.Thread.run(Thread.java:484) Process Exit...
Thank you
Raees

hi Raees,
sorry for replying late. u r right that it gives u the same server name as that of hard coding it. but the thing is we should better leave it to the explorer, coz sometimes suppose the server is on the same m/c as that of client then applet to EJB call gives security exception in one of these two; 127.0.0.1 and the actual IP of m/c, even though both are same. (reason, for the sand box, 127.0.0.1 and actual IP are different addresses). it will work only with the IP address, with which it had downloaded applet, so that's the reason i said this, coz if they are on the same m/c, client can call it both ways and then hard coded thing will give problem in one case.
second thing, have u tried running it that way? i think, we just need to pass the server name and as we are the setting all these properties for JNDI services, it can detect on which port of server the naming service is running. and also i am not really sure, whether applet can use all the protocols or not (except for http). for futher reference, use this hyperlink. this is for j-boss app.server but shouldn't make much of the difference.
http://jboss.org/online-manual/HTML/ch13s21.html
hope this helps,
anshu

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Calling EJB from an applet in 9iAS Release 2?

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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,
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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,
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Any and all help will be greatly appreciated.
Thanks,
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m

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
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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);
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System.out.println("Contexto inicial creado");
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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
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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
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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:
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Finalizado
I would appreciate if somebody could help me, as it is very
urgent.
Thanks in advance
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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

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)
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at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:242)
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at javax.naming.InitialContext.lookup(InitialContext.java:349)
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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

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?
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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

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..

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

Communicating with EJB from an applet

Hello there
can anyone please clarify an issue for me please? I would like to know if it's possible to call and EJB directly from an applet, without going via jsps or servlets. The J2EE specification says that "All J2EE components except applets, can be clients of RMI-IIOP objects. (Some products might also allow applets to use RMI-IIOP, but this capability is not required)." It appears to be the same situation for JDBC connections also. Would anyone please know how some products allow applets to be clients of RMI-IIOP and what exactly is required?
many thanks!

Hi gurus....
I have the same question....
can anyone out there throw some light on the topic ?
many thanks,
Calherj

Accessing database from an applet

Hi
I'm trying to access the database (MS Access) using type 1 driver sun.jdbc.odbc.JdbcOdbcDriver from an applet client. It works fine with the java application and also using appletviewer after creating a policy file and ran using appletviewer -J-Djava.security.policy=testpolicy.policy Output.htm
But when i try to run through the applet, it throws the exception as
java.security.AccessException
Pls help me,
Thansk
L-m-t

There is another way of doing it. That is to sign the applet (or the applet jar-file). That way the browser displays a dialog to the user so he can press yes, to grant all permissions. I have not found a way (via a dialog) to let the user grant only the permissions you need for the database connection.
More information on: http://developer.java.sun.com/developer/technicalArticles/Security/applets/

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.

Problems in accessing EJB from stand-alone client

Hi,
I am trying to access a EJB deployed in RI from a stand-alone client. When I run it, I got this exception:
Exception in thread "main" java.rmi.AccessException: CORBA NO_PERMISSION 9998 Ma
ybe; nested exception is:
org.omg.CORBA.NO_PERMISSION: minor code: 9998 completed: Maybe
org.omg.CORBA.NO_PERMISSION: minor code: 9998 completed: Maybe
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Unknown Source)
at com.sun.corba.ee.internal.iiop.messages.ReplyMessage_1_2.getSystemExc
eption(ReplyMessage_1_2.java:93)
at com.sun.corba.ee.internal.iiop.ClientResponseImpl.getSystemException(
ClientResponseImpl.java:108)
at com.sun.corba.ee.internal.POA.GenericPOAClientSC.invoke(GenericPOACli
entSC.java:136)
at org.omg.CORBA.portable.ObjectImpl._invoke(Unknown Source)
at TheBeanRemoteStub.test(Unknown Source)
at Client.main(Client.java:19)
The following is the code of the client:
System.setProperty(Context.SECURITY_PRINCIPAL, "achong");
System.setProperty(Context.SECURITY_CREDENTIALS, "achong");
Context context = new InitialContext(System.getProperties());
Object object = PortableRemoteObject.narrow(context.lookup("MyBean"), TheBeanHome.class);
TheBeanHome home = (TheBeanHome) object;
I have set "support client choice" while deploying the bean, and set which roles can access which methods. Any idea? Is my code is incorrect?

I have the same problem like you.
If you solve it, please give me a hint.
Thank you very much!
[email protected]

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-

Problems Accessing EJB from Client

Hello All,
I have deployed my first EJB in my JBoss App server and thats fine. However when I try and run the simple client that I have written to access this I get the following error:
javax.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
I have tried Debugging the app and cant understand where/why this error is occurring? Any ideas and suggestions would be appreciated...The code I am using in the client is below:
Context c = new InitialContext();
      Object o = c.lookup("HelloWorldEJB");
      HelloWorldHome hw = (HelloWorldHome)PortableRemoteObject.narrow (o, HelloWorldHome.class);
      HelloWorld hello = hw.create();
      System.out.println ("Result is: " + hello.hello());
      hello.remove();

Hi!
I do not know if you have got the solution for your problem....
I am also struggling around with similar issue
Here is how i tried
Properties prop = System.getProperties();
prop.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
prop.put(Context.PROVIDER_URL, "localhost");
prop.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces" );
Context ctx = new InitialContext(prop);
System.out.println("looking up ejb");
Object obj = ctx.lookup("ejb/test");
DO NOT forget to put jbossall-client.jar and jnpserver.jar in your classpath .
This way at least you get the solution of the problem you are facing now.....
Good Luck
Alok

Accessing EJB from an Applet

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