docs: public String getConcreteBeanClassName()
      {
          if (ivVersion != EJB_2X &&
              ivBeanType != CONTAINER_MANAGED)
              return null;
  
          StringBuffer result = new StringBuffer();
  
          String packageName = packageName(ivBeanClass);
          if (packageName != null)
          {
              result.append(packageName);
              result.append('.');
          }
  
          result.append(concreteBeanPrefix); // Concrete
          result.append(ivBeanName); // First 32 characters
          result.append('_');
          result.append(ivHashSuffix); // 8 digit hashcode
  
          return result.toString();
      }