An exception occurred processing JSP page /login_do.jsp at line 13

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解决时间 2021-02-18 02:04

提问者网友：謫仙
2021-02-17 21:30

10: <% 11: LoginService loginService = new LoginService(); 12: String usertype = (String)request.getParameter("usertype"); 13: String msg = loginService.login(request , session); 14: if (msg != null) { 15: %> 16: alert('<%=msg%>'); Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:525) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:412) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:723) com.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:32) root cause javax.servlet.ServletException: java.lang.NoSuchMethodError: org.apache.log4j.Logger.isTraceEnabled()Z org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:868) org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:797) org.apache.jsp.login_005fdo_jsp._jspService(login_005fdo_jsp.java:107) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:723) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:723) com.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:32)

最佳答案

五星知识达人网友：狂恋
2021-02-17 22:20

Log4j 的jar 版本不对，可能是有冲突？ org.apache.log4j.Logger.isTraceEnabled 对应的方法找不到。

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1楼网友：我住北渡口
2021-02-17 23:45

java.lang.nullpointerexception:空指针异常，你是不是在要传值的时候没有给值，导致了空指针异常．

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