code: public void setWebApplicationConfigurationClassNames (String[] configurationClassNames)
      {
          if (configurationClassNames != null)
          {
              _webAppConfigurationClassNames = new String[configurationClassNames.length];
              System.arraycopy(configurationClassNames, 0, _webAppConfigurationClassNames, 0, configurationClassNames.length);
          }
      }
docs: setWebApplicationConfigurationClasses
  Set up the list of classnames of WebApplicationContext.Configuration
  implementations that will be applied to configure every webapp.
  The list can be overridden by individual WebApplicationContexts.
  @param configurationClasses