javax.faces.webapp.FacesServlet.service（FacesServlet.java:321）中的javax.servlet.ServletException

Question

我正在使用JSF 2.0，tomcat 7.0，mojarra 2.0.3和primefaces。 问题是我没有成功实现javax.servlet.Filter类重定向到登录页面如果用户试图在没有登录的情况下进入页面，但我也使用FileUpload将文件上传到服务器，我认为这是什么我和doFilter方法触发冲突，服务器抛出以下异常：

javax.servlet.ServletException 
javax.faces.webapp.FacesServlet.service (FacesServlet.java: 321) 
org.primefaces.webapp.filter.FileUploadFilter.doFilter (FileUploadFilter.java: 98) 
org.apache.tomcat.websocket.server.WsFilter.doFilter (WsFilter.java: 52)

我按如下方式配置了web.xml文件：

<!--this may be the cause of the error--!>

  <filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
  </filter>
  <filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
  </filter-mapping>
  <filter>
<filter-name>Login</filter-name>
<filter-class>controller.BeanFiltersession</filter-class>
  </filter>
  <filter-mapping>
<filter-name>Login</filter-name>
<url-pattern>/*</url-pattern>
  </filter-mapping>

之后删除实现Filter的类并删除web.xml文件中的行，但错误仍然存​​在 任何想法如何解决它？

问题不是FileUpload问题介于primefaces之间，我认为问题在于我指出一个过滤器使用HttpSession和HttpServletRequest来验证会话，登录后发给我这个异常，很明显删除了实现Filter的类，探测FileUpload并且工作没有问题，但我认为我在该类中所做的更改是在具有Tomcat 7.0的api.jar servlet-api中记录的，我的代码如下：

package validators;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
public class SessionValidator {
public static HttpSession getSesion(){
    return (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
}
public static HttpServletRequest getRequest(){
    return (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
}
public static String getUser(){
    HttpSession sesion= (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
    return sesion.getAttribute("usuario").toString();
}   
public static String getNivel(){
    HttpSession sesion=getSesion();
    if(sesion !=null){
        return sesion.getAttribute("nivel").toString();
    }else{
        return null;
    }
}
}

我登录代码时调用的SessionValidator类是：

package controller;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.servlet.http.HttpSession;

import org.primefaces.context.RequestContext;

import validators.SessionValidator;
import model.csConexion;
import model.csSesion;

@ManagedBean
@SessionScoped
public class BeanSesion implements Serializable{


private static final long serialVersionUID = 1L;

private csSesion sesion;
private csConexion con;
HttpSession session;
private String usuario;
private String nivel;

public BeanSesion(){
    sesion=new csSesion();
    con=new csConexion();
}
public String getUsuario(){

return SessionValidator.getUser();
}
public void setUsuario(String usuario){

    this.usuario=usuario;
}
public String getNivel(){
    if(SessionValidator.getSesion().getAttribute("usuario")!=null){
        return SessionValidator.getNivel();
    }else{
        return "";
    }
}
public void setNivel(String nivel){

    this.nivel=nivel;
}

public csSesion getSesion(){
    return sesion;
}
public void setSesion(csSesion sesion){
    this.sesion=sesion;
}
public String iniciarsesion(ActionEvent e){
    RequestContext context= RequestContext.getCurrentInstance();
    FacesContext fcontext= FacesContext.getCurrentInstance();
    FacesMessage message=null;
    boolean ok=false;
    ResultSet rs;

    try {
        if(con.conectar()==true){
            String sql="select*from usuario where usuario=? and contrasenia=?";
            PreparedStatement comando= con.getConexion().prepareStatement(sql);
            comando.setString(1,sesion.getUsuario());
            comando.setString(2,sesion.getContrasenia());
            rs=comando.executeQuery();
            if(rs.next()){
                nivel= rs.getString("nivel");
                usuario= rs.getString("usuario");
                ok=true;
                session= SessionValidator.getSesion();
                session.setAttribute("usuario", usuario);
                session.setAttribute("nivel", nivel);


                message= new FacesMessage(FacesMessage.SEVERITY_INFO,"¡Bienvenido!",sesion.getUsuario());

                try {
                    if(nivel.equals("master")){
                    fcontext.getExternalContext().redirect("admin/admin.xhtml");
                    }else if(nivel.equals(null)){
                        fcontext.getExternalContext().redirect("index.xhtml");
                    }

                } catch (Exception e2) {
                    e2.printStackTrace();
                    message= new FacesMessage(FacesMessage.SEVERITY_WARN,"Error","Error");
                }
            }else{
                ok=false;
                message= new FacesMessage(FacesMessage.SEVERITY_ERROR,"Error","Usuario o contraseña inválidos");
            }
            FacesContext.getCurrentInstance().addMessage(null,message);
            context.addCallbackParam("Ok", ok);
        }
    } catch (Exception ex) {
        ex.printStackTrace();
        ok=false;
    }
    finally{
        System.out.println(nivel);
        con.desconectar();
    }
    return nivel;
}
}

这是发送Tomcat的例外：

excepción 
javax.servlet.ServletException: null source
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:98)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

causa raíz 
java.lang.IllegalArgumentException: null source
java.util.EventObject.<init>(Unknown Source)
javax.faces.event.SystemEvent.<init>(SystemEvent.java:67)
javax.faces.event.ComponentSystemEvent.<init>(ComponentSystemEvent.java:69)
javax.faces.event.PostRestoreStateEvent.<init>(PostRestoreStateEvent.java:69)
com.sun.faces.lifecycle.RestoreViewPhase.deliverPostRestoreStateEvent(RestoreViewPhase.java:256)
com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:245)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:107)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:98)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)