code: @Override
      public ClassLoader getClassLoader(String identifier) throws IllegalArgumentException {
          if (identifier == null)
              return null;
          ThreadContextClassLoader classloader = tcclStore.retrieve(identifier);
          if (classloader != null) {
              return classloader;
          }
          return null;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.ws.classloading.ClassLoaderIdentityService#getClassLoader(com.ibm.wsspi.classloading.ClassLoaderIdentity)