This Request error:org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 10 in the jsp file: /jndsimg/xqjy.jsp ParamUtils cannot be resolved 7: <%@ page import="java.io.*,java.util.*,jxl.*,jxl.write.*"%> 8: 9: <% 10: String artId = ParamUtils.getParameter(request,"articleId",""); 11: //System.out.println("******artId******"+artId); 12: ArticleContents ac = new ArticleContents(); 13: List cdt = new ArrayList(); An error occurred at line: 12 in the jsp file: /jndsimg/xqjy.jsp ArticleContents cannot be resolved to a type 9: <% 10: String artId = ParamUtils.getParameter(request,"articleId",""); 11: //System.out.println("******artId******"+artId); 12: ArticleContents ac = new ArticleContents(); 13: List cdt = new ArrayList(); 14: cdt.add("articleid = '"+artId+"'"); 15: List aclist = ac.query(cdt); An error occurred at line: 12 in the jsp file: /jndsimg/xqjy.jsp ArticleContents cannot be resolved to a type 9: <% 10: String artId = ParamUtils.getParameter(request,"articleId",""); 11: //System.out.println("******artId******"+artId); 12: ArticleContents ac = new ArticleContents(); 13: List cdt = new ArrayList(); 14: cdt.add("articleid = '"+artId+"'"); 15: List aclist = ac.query(cdt); An error occurred at line: 15 in the jsp file: /jndsimg/xqjy.jsp ArticleContents cannot be resolved to a type 12: ArticleContents ac = new ArticleContents(); 13: List cdt = new ArrayList(); 14: cdt.add("articleid = '"+artId+"'"); 15: List aclist = ac.query(cdt); 16: //System.out.println("******aclist.size()******"+aclist.size()); 17: String content = ""; 18: String title = ""; Stacktrace: