Class cast exception while casting FTPConnectionFactory object

Hi
I have SOA Suite Advanced installation - 10.1.3.4 MLR#5.
I have developed a BPEL which polls an FTP site using a JCA FTPConnectionFactory registered in JNDI - eis/Ftp/My_Ftp.
If file is present, then BPEL doesnt fetchs it... instead calls a java program through WSIF binding.
In java program i am retrieving the JNDI object - eis/Ftp/My_Ftp.. casting it to oracle.tip.adapter.ftp.FTPConnectionFactory and get the FTP host and credentials.
Now using those details i mannually create an FTP Connection and retieve the file.
This program worked for sure... but recently when i tried the same i got the ClassCastException while casting java.lang.Object got from JNDI to oracle.tip.adapter.ftp.FTPConnectionFactory. I havnt changed any thing on server since... could not understand why this issue has cropped now.
After lot of research the issue seems due to different Classloaders. JNDI object was loaded by ClassLoaderA and in my java program it is being loaded by ClassLoaderB.
And these two classloaders dont share classes with each other.
This is the code:
InitialContext ctx = new InitialContext();
Object jndiFTPObj = ctx.lookup("eis/Ftp/My_Ftp");
System.out.println("Got Object from JNDI is: "+jndiFTPObj+" ClassLoader - "+jndiFTPObj.getClass().getClassLoader());
// it prints -- Got Object from JNDI is: oracle.tip.adapter.ftp.FTPConnectionFactory@1aa3bbc ClassLoader - FtpAdapter:0.0.0
FTPConnectionFactory ftpConF = (oracle.tip.adapter.ftp.FTPConnectionFactory)jndiFTPObj;
// here i get error -- java.lang.ClassCastException: oracle.tip.adapter.ftp.FTPConnectionFactory
Thinking of RMI/IIOP i even tried:
FTPConnectionFactory ftpConF = (FTPConnectionFactory)PortableRemoteObject.narrow(ctx.lookup("eis/Ftp/My_Ftp"), FTPConnectionFactory.class);
it didnt solve the error.
I tried loading the class using the same loader as:
Class.forName("oracle.tip.adapter.ftp.FTPConnectionFactory",true,jndiFTPObj.getClass().getClassLoader());
even that didnt solve the error.
If any body has some idea... pls help
Thanks
Inder

Issue was due to ClassLoaders... tried to use the same classloader... but couldnt.
Eventually solved it by using Java Reflection.
Thx

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Dear all,
Please help me...to solve this
I have a database having two columns of String and Date Types.
In my java code i was trying to load the data to a UI.
I am successfull in loading the String type value.
But while loading date field value,is showing Class cast Exception.
What i am doing is Getting the values from database to a String[] array.
So my question is how to
get the Date field as date field itself,Then convert it to a String..Then put it in to String[] array...
Any body please help...If any one want more clarification in question i will give......

Hi,
I am using GWT to display my data in a Grid.
So it will accept a Single two dimensional String array....Here i have one as String and other as Date.
So i was trying to get each row in a sindle dimensional array array[] then store it in a list.
Iteration goes up to 10 rows.After i am setting it in to a list
ie list.add(array);
Now while returning this list i am doing this
"return (String[][])list.toArray(new String[0][]);"
When i tried to get the date element to String array it is showing class cast exception. When i tried with toString() method it is showing the same problem.

Class cast exception using Finder method

Hello. I'm new to J2EE. I have set up one entity bean but am having trouble
with my current one.
Basically, I have two finder methods:
public ShareHistory findByPrimaryKey(Integer historyId)
        throws FinderException, RemoteException;
    public Collection findByShare(String shareId)
         throws FinderException, RemoteException; findByPrimaryKey works fine, but findByShare causes a class cast exception in java.lang.String.
The stack trace in the server logs shows that it is my ejbActivate method in my entity bean causing the problem:
public void ejbActivate() {
      //String numberString = (String) context.getPrimaryKey();
      //historyId = new Integer(numberString);
    historyId = (Integer) context.getPrimaryKey();
    }The stack trace from my client shows that the class cast exception occurs
in the client at the System.out.println("shareid" + ": " + sh.getShareId());
line:
Collection c = sharesHistoryHome.findByShare("DCAN");
                 Iterator i = c.iterator();
                      while (i.hasNext()) {
                     ShareHistory sh = (ShareHistory) i.next();
                System.out.println("shareid" + ": " + sh.getShareId());
                System.out.println("value" + ": " + sh.getValue());
                 System.out.println("time" + ": " + sh.getTime());
                 System.out.println("date" + ": " + sh.getDate());
                 }//whileAs you can see I tried casting to a string in ejbactivate, but that simply causes an Integer class cast exception during findByprimaryKey instead. How do I allow both Integer and String objects to be used?
Also I am a bit confused as to why the String passed to findByShare(String) is being used in context.getPrimaryKey() in the first place (if that is actually what's happening).

Oops my FindByShare method was returning a collection of shareId's (strings) instead of a collection of Integer primary keys, which would explain the class cast exception.

Class cast exception in Ejb Look up

Hi friends,
Deploying one ejb with JBoss_4_2_2_GA and deploying well.
But while trying to look up it getting some exception like
java.lang.ClassCastException: $Proxy78 cannot be cast to stateless.CalculatorRemote
please help to identify
here is code
Remote
package stateless;
import java.math.*;
import javax.ejb.Remote;
import java.lang.annotation.*;
@Remote
public interface CalculatorRemote {
public float add(float x, float y);
public float subtract(float x, float y);
public float multiply(float x, float y);
public float division(float x, float y);
and stateless bean
package stateless;
import java.math.*;
import javax.ejb.Stateless;
import javax.ejb.Remote;
@Stateless(name="CalculatorBean")
@Remote(CalculatorRemote.class)
public class CalculatorBean implements CalculatorRemote{
     public float add(float x, float y){
          return x + y;
   public float subtract(float x, float y){
      return x - y;
    public float multiply(float x, float y){
      return x * y;
   public float division(float x, float y){
        return x / y;
and lookup code
public void jspInit() {
        try {
            InitialContext ic = new InitialContext();
               calculator = (CalculatorRemote) ic.lookup("example/CalculatorBean/remote");
               System.out.println("Loaded Calculator Bean");
        } catch (Exception ex) {
           e.printStackTrace ();
    }

hi i have gone through JNDI and
while calling look up from standard alone application, it will work fine
          InitialContext ctx = null;
          Hashtable<String, String> props = new Hashtable<String, String>();
          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", "jnp://localhost:1099");
          try {
               ctx = new InitialContext(props);
               CalculatorRemote calc = (CalculatorRemote) ctx.lookup("CalculatorBean/remote");
               System.out.println( "addition   ==   " + calc .add( 10, 20 ));
          } catch (NamingException e) {
               e.printStackTrace();
     when i am try to look up it from servlet following way but getting save error.
i have used following way
1. InitialContext ic = new InitialContext();
Object obj = ic.lookup( "CalculatorBean/remote" );
CalculatorRemote calc= ( CalculatorRemote )PortableRemoteObject.narrow ( obj, CalculatorRemote .class );
it getting following error
java.lang.ClassCastException
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
Caused by: java.lang.ClassCastException: $Proxy73 cannot be cast to org.omg.CORBA.Object
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
2. calculator = (CalculatorRemote) ic.lookup("CalculatorBean/remote");
java.lang.ClassCastException: $Proxy73 cannot be cast to forums.business.ForumManager
at forums.web.ForumServlet.init(ForumServlet.java:36)

Type problem - Class Cast Exception - trying to understand

hello,
i get a Class cast exception in the following code.
interface Foo {}
class Alpha implements Foo {}
class Beta extends Alpha {}
class Delta extends Beta {
public static void main( String[] args ) {
Beta x = new Beta();
Beta b = (Beta)(Alpha)x; //fine
Foo f = (Delta)x; //CCE
Object ob = new Object();
String s = new String();
ob = s; //fine, no need of case
s = (String)ob; //needs a castI was just thinking, implicitly Delta and Beta both of them IS-A Foo, and assigning x to a type foo shouldnt be a problem(while making it refer to the Delta class) so, what could cause the CCE ?
I would appreciate if someone could please help me understand this.
Rgds

Hi.
Assigning your "x" to a variable typed Foo is not a problem. The problem is that you are trying to cast an instance of Beta ("x") into type Delta which is not possible. Every Delta is a Beta, but not every Beta will be a Delta!
Simple as that.
Bye.

Class cast exception while casting FTPConnectionFactory object

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