BizProcException: BPE027 Could not get an instance for 'Callable'-class

Question

Hi Experts...
I have so much troubles with the implementation of the  "Java Class Atom"...
My Scenario doesn't work because i don't have any idea how to use this atom.
Can you help me to implement my Java class...i had read the documentation
but the atom does not work...put here mi java class code
package Hola;
import java.util.regex.Pattern;
import java.util.Enumeration;
import com.sap.b1i.bizprocessor.*;
import java.sql.Connection;
public abstract class Hola implements Callable{
     public Hola(){ }
     public boolean call(java.util.Properties inProps, BizProcMessage inMsg, java.util.Properties outProps, BizProcMessage outMsg, java.sql.Connection conn, java.lang.String jobID) throws Exception{
       try{
            String ret = null;
            ret = "Call Response in outprop ";  
            outProps.setProperty("clsprop", ret);
            return false;
       catch (Exception e){
            throw new Exception("Error");
  public boolean isThreadSafe() {return false;}
  public boolean usesJDBC() {return false;}
  public void mustDestroy(){}
  public static void main(String[] args){
I have the suspect of the error is on my code, but i'm not sure.
Thank you very much.
Best Regards.
Enrique

Answer 1

Well I found this under Control Center -> Development -> BPC Reference
User defined Java-Classes for the Call-Atom via the 'Callable' interface
com.sap.b1i.bizprocessor.Callable
This interface must be implemented by classes intended to be called by the B1iBizProcessor via the Call-Atom. Instances of these classes are subject of internal pooling if they do not indicate after a usage that they should be destroyed. In order to be able to create them internally in a generic way, they have to implement a parameterless initializer !!!
I just searched the entire BizStore for com.sap.b1i.bizprocessor.Callable but was unable to find it. 
I also searched Google for com.sap.b1i.bizprocessor.Callable and it only come up with my posts.
I also searched the SAP Partner Portal, and SAP SDN with no avail.
Is this functionality only for internal SAP use?