接着上回，导包正确之后，出现javabean.Friend cannot be cast to java.util.List，的错误。找了很久。以为是User user0作为参数，改成了String

import org.apache.commons.dbutils.handlers.BeanListHandler;这个包，BeanListHandler让我发现List<Friend> list = (List<Friend>) runner.query(sql, new BeanHandler<Friend>(Friend.class),username);里的new BeanHandler<Friend>(Friend.class)是错误的，应该：new BeanListHandler<Friend>(Friend.class)

javabean.Friend cannot be cast to java.util.List

标签：错误,user0,List,包多,new,class,Friend,BeanListHandler
来源： https://www.cnblogs.com/hyjh/p/11028590.html