我想用jsp做一个bbs，但遇到问题了。

新手啊。不懂怎么运行。装了tomcat和jdk后按照说明运行但还是没反应，错误如下：type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSP: 
An error occurred at line: 22 in the jsp file: /web/forum/INC/const.jsp
ForumPropertiesManager cannot be resolved
19:  String topicNum,bbsNum,todayNum,userNum,lastNum,lastUser;
20:  int tableWidth=700;
21:    try{
22:  forumName=ForumPropertiesManager.getString("ForumName");
23:  forumURL=ForumPropertiesManager.getString("ForumURL");
24:  companyName=ForumPropertiesManager.getString("CompanyName");
25:  hostURL=ForumPropertiesManager.getString("HostUrl");
An error occurred at line: 23 in the jsp file: /web/forum/INC/const.jsp
ForumPropertiesManager cannot be resolved
20:  int tableWidth=700;
21:    try{
22:  forumName=ForumPropertiesManager.getString("ForumName");
23:  forumURL=ForumPropertiesManager.getString("ForumURL");
24:  companyName=ForumPropertiesManager.getString("CompanyName");
25:  hostURL=ForumPropertiesManager.getString("HostUrl");
26:  SMTPServer=ForumPropertiesManager.getString("SMTPServer");
请问是代码错吗?