docs: public void introspect(IntrospectionWriter writer)
      {
          writer.begin("Activator Dump (" + beanCache.getName() + "): " + beanCache.getSize() + " beans in cache");
  
          Enumeration<Element> vEnum = ((Cache) beanCache).enumerateElements();
          while (vEnum.hasMoreElements())
          {
              Element element = vEnum.nextElement();
              Object key = element.getKey();
              if (key instanceof TransactionKey)
              {
                  Object bean = element.getObject();
                  String state = element.stateToString();
                  ContainerTx tx = ((TransactionKey) key).tx;
                  writer.println(bean + state + " : " + tx);
              }
              else
              {
                  writer.println(element.toString());
              }
          }
  
          writer.end();
      }