我可以在 appEngine 应用程序中 setAttribute() 但不能 removeAttribute()

【问题标题】：I'm able to setAttribute() but not removeAttribute() in appEngine app我可以在 appEngine 应用程序中 setAttribute() 但不能 removeAttribute()
【发布时间】：2019-03-21 02:39:03
【问题描述】：

我最近发现了一个奇怪的会话行为，标题说明了一切。 这是一个示例（它出现在每个 Servlet 上）：

package com.orvif.servletsClient;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



/**
 * Servlet implementation class Accueil
 */
@WebServlet({"/Accueil","/"})
public class Accueil extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private String view = "/WEB-INF/view_client/index.jsp";

    /**
     * @see HttpServlet#doGet(HttpServletRequest request,HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getSession().setAttribute("test","test");
        System.out.println("Test before trying to remove : "+request.getSession().getAttribute("test"));
        request.getSession().removeAttribute("test");
        System.out.println("Test after remove operation : "+request.getSession().getAttribute("test"));

        this.getServletContext().getRequestDispatcher(view).forward(request, response);
    }
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

问题在于：

request.getSession().removeAttribute("test");

抛出 NullPointerException，老实说，我不知道为什么。这是调用 servlet 后我在控制台上看到的内容：

Test before trying to remove : test
2018-10-16 15:59:44.444:WARN:oejs.HttpChannel:qtp1312381159-17: /favicon.ico
java.lang.NullPointerException
at com.google.apphosting.runtime.jetty94.AppEngineSession.setAttribute(AppEngineSession.java:81)
at org.eclipse.jetty.server.session.Session.removeAttribute(Session.java:786)
at com.orvif.servletsClient.Accueil.doGet(Accueil.java:37)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
at com.orvif.filters.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:97)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:44)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:595)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:531)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
at java.base/java.lang.Thread.run(Thread.java:844)

会话当然是在 appengine-web.xml 中启用的。 这是 appengine-web.xml ：

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <sessions-enabled>true</sessions-enabled>
    <threadsafe>true</threadsafe>
    <runtime>java8</runtime>
    <staging>
        <enable-jar-classes>true</enable-jar-classes>
    </staging>
    <use-google-connector-j>true</use-google-connector-j>
</appengine-web-app>

还有 web.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
  <display-name>MYAPP</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <listener>
    <listener-class>
        com.orvif.config.InitilisationApp
    </listener-class>
  </listener>
  <filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>com.orvif.filters.UrlRewriteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

谁能告诉我这里发生了什么？

提前致谢。

【问题讨论】：

  • 粘贴完整的 doGet 方法。你现在所拥有的不会给你一个 NPE
  • 什么意思？ doGet 方法在帖子中已经完成。可能你的意思是完整的 Servlet 吗？
  • view的价值是什么？？ this.getServletContext().getRequestDispatcher(view).forward(request, response);
  • 好的，这就是完整的 Servlet。刚刚用你的要求编辑了我的帖子。对不起

标签： java google-app-engine session


【解决方案1】：

我从昨天开始遇到同样的错误并设法修复它： 我们在 IntelliJ 中使用了 Google Cloud SDK 插件，并将其设置为管理 SDK 安装本身。将其设置为使用本地安装时，一切似乎都运行良好。

那么：您是否将 IntelliJ 与 Google Cloud SDK 一起用于您的项目？如果是，那可能是您的问题。

【讨论】：

  • 非常感谢！这正是问题所在。现在它工作正常！
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