JNDI Newbie - Please help !!!

[mrroger]

This is my code:

package test.main;
import org.jboss.jmx.adaptor.rmi.RMIAdaptor;
import java.util.*;
import javax.management.*;
import javax.naming.*;

public class TestMain {
public static void main(String args[]) throws Exception {
System.out.println("Starting");
Properties props=new Properties(); props.put(InitialContext.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
props.put(InitialContext.PROVIDER_URL, "jnp://localhost:1099"); props.put(InitialContext.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces");
InitialContext ic = new InitialContext(props);
Hashtable icHash = ic.getEnvironment();
Enumeration enumHash = icHash.keys();
System.out.println("Key num: " + icHash.size());
while(enumHash.hasMoreElements()) {
Object nextIc = enumHash.nextElement();
System.out.print("Keys: "+nextIc.toString());
System.out.println(" = "+icHash.get(nextIc));
}
System.out.println("Initial Context ok: ");
NamingEnumeration names = ic.list("");
System.out.println("Has More: " + names.hasMoreElements());
while(names.hasMoreElements()) {
System.out.println((String) names.nextElement().toString());
}
RMIAdaptor server = (RMIAdaptor) ic.lookup("jmx/invoker/RMIAdaptor");
System.out.println("RMIAdaptor ok: "+server.getMBeanCount());
System.out.println("Name: " + server.getDefaultDomain());

===> ObjectName nameTest = new ObjectName("jboss:service=JNDIView");

MBeanInfo info = server.getMBeanInfo(nameTest);
System.out.println("Name: " + info.getClassName());
System.out.println("Finished");
}
}

This is the error where arrow is:

Exception in thread "main" java.lang.NullPointerException
at java.io.ObjectStreamClass.setClass(libgcj.so.7)
at java.io.ObjectInputStream.readClassDescriptor(libgcj.so.7)
at java.io.ObjectInputStream.readObject(libgcj.so.7)
at java.io.ObjectInputStream.readObject(libgcj.so.7)
at java.rmi.MarshalledObject.get(libgcj.so.7)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:119)
at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:227)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:167)
at org.jboss.jmx.connector.invoker.client.InvokerAdaptorClientInterceptor.invoke(InvokerAdaptorClientInterceptor.java:51)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
at org.jboss.proxy.ClientMethodInterceptor.invoke(ClientMethodInterceptor.java:59)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
at $Proxy0.getMBeanInfo(Unknown Source)
at test.main.TestMain.main(TestMain.java:50)

PLEASE HELP !!!!

WHERE I AM WRONG ???

Thank a lot

[peterj]

Which version of JBoss are you using?

Are you using the correct jbossall-client.jar that matches with the server?

I used 4.0.5, and here is my output:

Starting
Key num: 4
Keys: jnp.parsedName =
Keys: java.naming.provider.url = localhost:1099
Keys: java.naming.factory.initial = org.jnp.interfaces.NamingContextFactory
Keys: java.naming.factory.url.pkgs = org.jboss.naming:org.jnp.interfaces
Initial Context ok:
Has More: true
MyTxController: $Proxy72
MyCustomer: $Proxy60
TopicConnectionFactory: org.jboss.naming.LinkRefPair
jmx: org.jnp.interfaces.NamingContext
MyAccountController: $Proxy68
HTTPXAConnectionFactory: org.jboss.mq.SpyXAConnectionFactory
ConnectionFactory: org.jboss.mq.SpyConnectionFactory
UserTransactionSessionFactory: $Proxy12
HTTPConnectionFactory: org.jboss.mq.SpyConnectionFactory
MyTx: $Proxy62
XAConnectionFactory: org.jboss.mq.SpyXAConnectionFactory
UserTransaction: org.jboss.tm.usertx.client.ClientUserTransaction
UILXAConnectionFactory: javax.naming.LinkRef
UIL2XAConnectionFactory: javax.naming.LinkRef
MyNextId: $Proxy63
MyAccount: $Proxy61
queue: org.jnp.interfaces.NamingContext
topic: org.jnp.interfaces.NamingContext
bank-client: org.jnp.interfaces.NamingContext
console: org.jnp.interfaces.NamingContext
MyCustomerController: $Proxy70
UIL2ConnectionFactory: javax.naming.LinkRef
HiLoKeyGeneratorFactory: org.jboss.ejb.plugins.keygenerator.hilo.HiLoKeyGenerato
rFactory
UILConnectionFactory: javax.naming.LinkRef
QueueConnectionFactory: org.jboss.naming.LinkRefPair
UUIDKeyGeneratorFactory: org.jboss.ejb.plugins.keygenerator.uuid.UUIDKeyGenerato
rFactory
RMIAdaptor ok: 522
Name: jboss
Name: org.jboss.mx.modelmbean.XMBean
Finished

[mrroger]

Thanks for your answer.

I am using jboss 4.0.2 with jdk 1.4.2

I am really newbie on jboss applications...maybe I am wrog with some setiings (eg: classpath) ?

Thank a lot

Giovanni

[jerrygauth]

Do all methods fail for your object name? Instead of using server.getMBeanInfo(), try
Object retval = server.invoke(nameTest, "listXML", null, null);
System.out.println(retval);

This should provide a listing of the JNDI tree contents.

[mrroger]

Thanks.

Yes it works !!!

What could be the problem with getMBeanInfo ??

[jerrygauth]

I think the problem is that you're working remotely so you're accessing proxies. Your original code will probably work as is if you execute it from a servlet rather than a remote client.

Working remotely, you need to use methods such as server.invoke() and server.getAttribute() to interact with the mbeans of interest.

Jerry

[mrroger]

Thanks.

What do you mean with "remotely" ? I am on the same machine. I am trying to use RMI to query the Server following the Jboss guide, but this example doesn't work.

Maybe I don't understand the correct use of RMI !!!

Giovanni

[jerrygauth]

By "remotely", I mean that you're not running in the same JVM. If you run your code from a servlet deployed to JBoss, you'll be in the same JVM and I suspect your code will work properly.

[peterj]

Giovanni,

The code you provided works as is (which is why I showed you the output from when I ran it). So the problem must be configuration. Here is the command line I used to run it:

java -cp .;$JBOSS_HOME/client/jbossall-client.jar test.main.TestMain

[mrroger]

Thanks Peter. Thanks Jerry

It was a misconfiguration in my Eclipse (using another JVM installed !!!).

Very good.

Thank a lot !!

Giovanni