jsp页面空指针异常

[hekui1002]

exception

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.edu.xidian.saas_customization_app.utils.EncodingFilter.doFilter(EncodingFilter.java:45)


root cause

java.lang.NullPointerException
org.apache.jsp.customization.manage_005fcustomized_005fsystem_jsp._jspService(manage_005fcustomized_005fsystem_jsp.java:260)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
cn.edu.xidian.saas_customization_app.utils.EncodingFilter.doFilter(EncodingFilter.java:45)

[conleyfree]

仔细看看代码哪部分出现空指针，你没贴有用代码也帮不了。 看看这句：cn.edu.xidian.saas_customization_app.utils.EncodingFilter.doFilter(EncodingFilter.java:45) 应该是你自己写的Filter吧 检查一下。

[小z啊]

用debug试一下吧

[hekui1002]

是这儿出错：cn.edu.xidian.saas_customization_app.utils.EncodingFilter.doFilter(EncodingFilter.java:45) 这是我的过滤器： public class EncodingFilter implements Filter { protected String encoding = null; protected FilterConfig filterConfig = null; public void destroy() { this.encoding = null; this.filterConfig = null; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { try{ if (encoding != null) { request.setCharacterEncoding(encoding); filterChain.doFilter(request,response); //执行这句话，抛出异常ServletException } } catch (ServletException sx) { filterConfig.getServletContext().log(sx.getMessage()); } catch (IOException iox) { filterConfig.getServletContext().log(iox.getMessage()); } } public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig; if(filterConfig.getInitParameter("encoding") != null) { this.encoding = filterConfig.getInitParameter("encoding"); } } }

[day_moon]

没什么好说的，调试走起！！