Null Pointer Exception, in Client and Server programs for JavaIDL
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Posted By:   ASHAKIRAN_JAIN
Posted On:   Friday, October 5, 2001 11:44 PM

When I run My Server program in JavaIDL, rebind method is throwing an Null Pointer Exception. As well as in the Client Program, in the resolve and narrow method also throwing NullPointerException. I checked for all objects, no one is pointing(refering) to null. I am using tnameServer. The source code is pasted down, Please get me correct code for that. Thanks, bye, Ashakiran //////////////////// HelloServant.java /////////////////// import HelloApp.*; import org.omg.CosNaming.*; import org.omg.CosNaming.NamingContextPackage.*; import org.omg.CORBA.*; class HelloServant extends _   More>>

When I run My Server program in JavaIDL,
rebind method is throwing an Null Pointer Exception.
As well as in the Client Program,
in the resolve and narrow method also
throwing NullPointerException.
I checked for all objects, no one is
pointing(refering) to null.


I am using tnameServer.

The source code is pasted down, Please
get me correct code for that.

Thanks,
bye,
Ashakiran

////////////////////
HelloServant.java
///////////////////
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;

class HelloServant extends _HelloImplBase{

public String sayHello(){
return "
Hello world ! !
";
}
}


/////////////////
HelloServer.java
///////////////////
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;

public class HelloServer{
public static void main(String args[]){

NamingContext ncRef=null;

//initialiing ORB
ORB orb = ORB.init(args, null);
if(orb == null)
System.out.println("orb not initialised");
else
System.out.println("orb initialised");

//create an servant instance, ie. impl
HelloServant helloRef = new HelloServant();

if(helloRef == null)
System.out.println("helloRef not initialised");
else
System.out.println("helloRef initialised");

//connects the servant to the ORB
orb.connect(helloRef);

try{

//obtain reference to the nameservice
org.omg.CORBA.Object objRef =
orb.resolve_initial_references("NameService");

if(objRef == null)
System.out.println("objRef not initialised");
else
System.out.println("objRef initialised");

try{
ncRef = NamingContextHelper.narrow(objRef);
if(ncRef == null)
System.out.println("ncRef not initialised");
else
System.out.println("ncRef initialised");

}catch(Exception e){
System.out.println("ERROR: " +e);
//e.printStackTrace();
}

NameComponent nc = new NameComponent("Hello","");

NameComponent path[] =new NameComponent[1];
path[0]=nc;

/**try{
ncRef.destroy();
}catch(Exception e){
System.out.println("Problem in destroy :"+e);
// e.printStackTrace();
}
*/
try{
ncRef.rebind(path,helloRef);
}catch(Exception e){
System.out.println("Problem in Rebind :"+e);
// e.printStackTrace();
}

java.lang.Object sync = new java.lang.Object();

synchronized(sync){
sync.wait();
}


}catch(Exception e){
System.out.println("Exception :"+e);
//e.printStackTrace();
}
}
}

//////////////////
HelloClient.java
/////////////////

import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CORBA.*;

public class HelloClient
{
public static void main(String args[])
{
try{

// create and initialize the ORB
ORB orb = ORB.init(args, null);

org.omg.CORBA.Object objRef =
orb.resolve_initial_references("NameService");

if(objRef == null)
System.out.println("objRef not initialised");
else
System.out.println("objRef initialised");

NamingContext ncRef = NamingContextHelper.narrow(objRef);

if(ncRef == null)
System.out.println("ncRef not initialised");
else
System.out.println("ncRef initialised");

// resolve the Object Reference in Naming

NameComponent nc = new NameComponent("Hello","");
NameComponent path[] = {nc};

Hello helloRef = null;

try{
helloRef = HelloHelper.narrow(ncRef.resolve(path));

if(helloRef == null)
System.out.println("helloRef not initialised");
else
System.out.println("helloRef initialised");


}
catch(Exception se){
//se.printStackTrace();
System.out.println("Problem in resolve :"+se);
}

// call the method and print results
String hello = helloRef.sayHello();
System.out.println(hello);

} catch (Exception e) {
System.out.println("ERROR : " + e) ;
e.printStackTrace(System.out);
}
}
}

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