Examples of net.paoding.rose.web.ControllerErrorHandler.onError()

        InvocationBean invb = (InvocationBean) inv;
        Module module = invb.getModule();
        while ((module = module.getParent()) != null) {
            ControllerErrorHandler handler;
            if ((handler = module.getErrorHandler()) != null) {
                return handler.onError(invb, ex);
            }
        }
        throw ex;
    }

                rose.getInvocation().setViewModule(errorHandlerModule);
                // 
                HttpServletRequest request = rose.getInvocation().getRequest();
                WebUtils.exposeErrorRequestAttributes(request, cause, null);
                StackTraceSimplifier.simplify(cause);  //对栈进行简化
                instruction = errorHandler.onError(rose.getInvocation(), cause);
            }


            // onError方法返回null，表示需要重新throw出去
            // rethrow出去的不是cause而是invException，目的要把整个异常抛出来，以让知道整个异常的来由
            if ((errorHandler == null) || (instruction == null)) {

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