我开始使用breadcrumbsonrails，它在生产中运作良好。在测试我的控制器规格失败，我想知道为什么。
控制器示例：
Unable to find static main(String[]) in 'HelloWorld'
java.lang.VerifyError: Verifier rejected class HelloWorld due to bad method void HelloWorld.main(java.lang.String[]) (declaration of 'HelloW
orld' appears in /storage/extSdCard/HelloWorld.zip)
rspec的stacktrace：
class AdvertisementsController < ApplicationController
layout 'mainapp'
before_action :advertiser?
before_action :new_add?
add_breadcrumb 'Gallery', :gallery_index_path
add_breadcrumb 'Post', :post_advertisements_path
def new
...
add_breadcrumb 'New', :new_post_advertisement_path
end