DispatcherPortlet.java 文件源码

/**
 * Return the HandlerAdapter for this handler object.
 * @param handler the handler object to find an adapter for
 * @throws PortletException if no HandlerAdapter can be found for the handler.
 * This is a fatal error.
 */
protected HandlerAdapter getHandlerAdapter(Object handler) throws PortletException {
    for (HandlerAdapter ha : this.handlerAdapters) {
        if (logger.isDebugEnabled()) {
            logger.debug("Testing handler adapter [" + ha + "]");
        }
        if (ha.supports(handler)) {
            return ha;
        }
    }
    throw new PortletException("No adapter for handler [" + handler +
            "]: Does your handler implement a supported interface like Controller?");
}