HttpServletRequest.GetSession返回null

Question

我有一個簡單的JEE應用程序，在登錄時會中斷。在我將它從氖轉移到火星之前它工作正常。雖然我改變服務器運行時對WildFly 10.0，但仍說，我的服務器運行時10.x的未綁定（我改變了運行時間都爲Web和EJB項目無論如何，這是我的方法：

public String login(){ 
     UserDto user = usersBean.validateUser(username, password); 
     if(null == user){ 
      MessageUtils.addErrorMessage("login.error.invalid.credentials"); 
      return ""; 
     } else{ 
      request.getSession().setAttribute("LOGGED_USER", user); 
      ******the upper code fails******** 
      return SUCCESS_LOGIN_REDIRECT; 
     } 
    } 

堆棧跟蹤：

Context Path:/JEEProjectWeb 
Servlet Path:/page/login.html 
Path Info:null 
Query String:null 
Stack Trace 
javax.servlet.ServletException: java.lang.NullPointerException 
javax.faces.webapp.FacesServlet.service(FacesServlet.java:671) 
io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) 
io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) 
bg.JEE.web.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:60) 
io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) 
io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) 
io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) 
io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) 
org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) 
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) 
io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) 
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) 
io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) 
io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) 
io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) 
io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) 
io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) 
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) 
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) 
io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) 
io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) 
io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) 
io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) 
io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) 
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) 
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) 
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) 
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) 
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) 
io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) 
io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) 
io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) 
io.undertow.server.Connectors.executeRootHandler(Connectors.java:202) 
io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805) 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
java.lang.Thread.run(Thread.java:745) 

我在這個非常新的，不知道什麼可能導致這個錯誤，但我一直試圖把request.getSession（）中的變量和調試它返回null，所以應該有。 setAttribute函數沒有問題

請幫助我！預先安排！

附加信息：

身份驗證篩選：

package bg.JEE.web.filter; 
import java.io.IOException; 
import java.io.Serializable; 
import javax.servlet.Filter; 
import javax.servlet.FilterChain; 
import javax.servlet.FilterConfig; 
import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpSession; 
import bg.JEE.dto.UserDto; 

public class AuthenticationFilter implements Filter, Serializable { 

    private static final long serialVersionUID = 1L; 

    public static final String PATH_INDEX = "/index.jsp"; 
    public static final String PATH_LOGIN = "/page/login.html"; 
    public static final String PATH_LOGOUT = "/page/logout.jsp"; 

    public void init(FilterConfig filterConfig) throws ServletException { 

    } 

    public void destroy() { 
    } 

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
      throws IOException, ServletException { 

     HttpServletRequest httpRequest = (HttpServletRequest) request; 

     String requestedPath = httpRequest.getRequestURI().substring(httpRequest.getContextPath().length()); 

     /* 
     * Skip the action with path "index.jsp" - there is no logged user, but 
     * the user is redirected to login screen 
     */ 
     if (PATH_INDEX.equals(requestedPath)) { 
      chain.doFilter(request, response); --row 60 
      return; 
     } 
     /* 
     * Skip the action with path "/login.login.html" - there is no logged 
     * user, but the user is trying to log in 
     */ 
     if (PATH_LOGIN.equals(requestedPath)) { 
      chain.doFilter(request, response); 
      return; 
     } 

     /* 
     * Get logged user from the HttpSession 
     */ 
     HttpSession session = httpRequest.getSession(); 
     UserDto loggedUser = (UserDto) session.getAttribute("LOGGED_USER"); 

     /* 
     * Redirect to login page if there is no logged user and trying to 
     * access protected resource 
     */ 
     if (loggedUser == null) { 
      RequestDispatcher requestDispatcher = request.getRequestDispatcher(PATH_LOGIN); 
      requestDispatcher.forward(request, response); 
      return; 
     } else { 
      chain.doFilter(request, response); 
      return; 
     } 

    } 
} 

而這裏的一排60碼距離LoginBean：

public void setUsername(String username) { 
     this.username = username; 
    } 

Answer 1

似乎有幾個問題。我無法幫助解決Eclipse問題，但另一個錯誤可能是問題的一部分。如果你使用EJB，你需要有一個beans.xml。它基本上可以是空的：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
          http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd" 
     version="1.1" bean-discovery-mode="all"> 
</beans> 

如果你有一個Maven項目，把它放在resources/META-INF/beans.xml中。如果您使用的是不同的構建系統，則該文件需要放在war文件/ webapp目錄中的classes/META-INF/beans.xml中。

現在可以忽略另一個錯誤 - 節點標識符消息。如果您決定將您的Wildfly服務器集羣化，那麼您需要更新它 - 有關更多詳細信息，請參閱this link。

但接近解決您的問題，「請求」在哪裏通過？你能展示更多的代碼嗎？