Too many exceptions for first EJB Client App

[Sandip Shinde]

Using Sun RI server

While accessing EJB component got different errors for diffrent code combinations

//
Context con = new InitialContext();
Object objTatto = con.lookup("Tatto");
TattoHome tattoHome = (TattoHome) PortableRemoteObject.narrow(objTatto, TattoHome.class);
//

for above code I got --->
javax.naming.NoInitialContextException: Need to specify class name in environment or system property


//
Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL, "iiop://localhost:4848");
Context con = new InitialContext(env);
Object objTatto = con.lookup("Tatto");
TattoHome tattoHome = (TattoHome) PortableRemoteObject.narrow(objTatto, TattoHome.class);
//

for above code I got-->
javax.naming.CommunicationException: Cannot connect to ORB. Root exception is org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 208 completed:

though RI is displaying bean as deployed

what is wrong exactly ....
[ April 29, 2005: Message edited by: Sandip Shinde ]

[Sandip Shinde]

Finally I am able to get reference of EJBHome by lookup
for that I made changes in code (as described solution to other thread in this message board)

//
Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.cosnaming.CNCtxFactory");env.put(Context.PROVIDER_URL,"iiop://localhost:3700");

Context con = new InitialContext(env);
//

Now there is ClassCastException

when I try to narrow HomeObject
TattoHome tattoHome = (TattoHome) PortableRemoteObject.narrow(objTatto, TattoHome.class);

I am using eclipse to run client(standalone java app), and client project setting is including path to Client.jar generated by Sun RI server.

why ClassCastException is there

??
please help

[Valentin Tanase]

Hi Sandip,

Can you please post the error stack trace?
However at a glance I suspect that something might be wrong here:

Object objTatto = con.lookup("Tatto");

Can you please check whether you�re looking up the home interface? I�m afraid that you actually look up the bean here and not the home interface. Probably your code should look like this:

Object objTatto = con.lookup([B]"TattoHome"[/B]);

Again a full stack trace might help little bit.
Regards.

[Robert Paris]

in the properties for your initial context you need to set the following:

java.naming.factory.initial
java.naming.factory.url.pkgs
java.naming.provider.url
(and for some vendors, they also require a few others including security settings like Principal)

for JBoss (as an example) the above would be:

Properties props = new Properties();
 
props.put( "java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory" );
props.put( "java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces" );
props.put( "java.naming.provider.url", "localhost" ); //Or whatever your address is
 
InitialContext ctx = new InitialContext( props );

[ May 12, 2005: Message edited by: Robert Paris ]

[Sandip Shinde]

Hi Valentin,

here is stacktrace

java.lang.ClassCastException
at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:293)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
at com.end.TattoClient.main(TattoClient.java:50)

Actually I am able to get refernce of HomeObject , exception is coming for the line on which I am trying to cast it using narrow method.

Bean deployed "Tatto" as JNDI Name , so am looking for Tatto.

when I kept watch on the returned object(returned by lookup) it is something like -->
com.sun.corba.se.internal.iiop.CDRInputStream_1_0$1:IOR:0000000000000029524d493a636f6d2e73746172742e546174746f486f6d653a3030303030303030303030303030303000000000000000010000000000000198000102000000000f3139322e3136382e3130322e313100000e74000000000056afabcb00000000260000003f00000009533141532d4f5242000000000000000200000008526f6f74504f41000000001237333035303637323334333032333631360000000000000d010387330f9c000000000001ff0a00000000000700000001000000200000000000010001000000020501000100010020000101090000 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
and again I have made sure that Client.jar is added to project as external Jar files using eclipse project setting.

Thanks and regards
Sandip
[ May 13, 2005: Message edited by: Sandip Shinde ]

[Valentin Tanase]

Actually I am able to get refernce of HomeObject , exception is coming for the line on which I am trying to cast it using narrow method.

Bean deployed "Tatto" as JNDI Name , so am looking for Tatto.

Yes you right it should work. If your client wouldn�t be able to lookup the bean, or the bean was not properly deployed you�d get different error messages. Also you�d get ClassNotFoundException if the client wouldn�t be able to load the bean specific classes.
Unfortunately I never used Sun RI server and therefore I can�t help you much here. But at least I can suggest you couple of things:

Try to use ejb references and JNDI ENC.

Make sure the TattoHome client and server versions are identical.

Regards.