Glassfish 4.1错误：session.invalidate nullpointer异常

我更新了Netbeans从7.3到8.01和Glassfish从4.0到4.1。现在我的项目中有这个异常。为什么？Session不是null，但是我有一个nullpointerexception。我在哪里做错了？感谢Glassfish 4.1错误：session.invalidate nullpointer异常

12|public class LogoutServlet extends HttpServlet { 
13| 
14|@Override 
15|protected void doGet(HttpServletRequest request,HttpServletResponse response) 
16|  throws ServletException,IOException{ 
17|  
18| HttpSession session=request.getSession(); 
19| if(session!=null) 
20|  session.invalidate(); 
21| response.sendRedirect("index.jsp"); 
22| }//doGet 
23| 
24|}//LogoutServlet

错误代码：

Session event listener threw exception 
java.lang.NullPointerException 
at org.jboss.weld.servlet.WeldTerminalListener.getSessionContext(WeldTerminalListener.java:65) 
at org.jboss.weld.servlet.WeldTerminalListener.sessionDestroyed(WeldTerminalListener.java:57) 
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:910) 
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:854) 
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:842) 
at org.apache.catalina.session.StandardSession.invalidate(StandardSession.java:1603) 
at org.apache.catalina.session.StandardSessionFacade.invalidate(StandardSessionFacade.java:204) 
at store.web.LogoutServlet.doGet(LogoutServlet.java:20) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282) 
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459) 
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167) 
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201) 
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175) 
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235) 
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561) 
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56) 
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137) 
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565) 
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545) 
at java.lang.Thread.run(Thread.java:724)

来源

2014-11-08 Alex

这是一个Glassfish的错误。 https://java.net/jira/browse/GLASSFISH-21166 – Alex 2014-11-08 21:39:55

另外，在第19行中，'session'永远不会为空。如果您希望使用null而不是新的会话，请使用'request.getSession（false）'。 – Tap 2014-11-09 00:41:01

来自JavaEE Api：getSession（）“返回与此请求关联的当前会话，或者如果请求没有会话，则创建一个会话。”。第19行是不必要的。因此这是Glassfish 4.1中的错误 – Alex 2014-11-09 10:39:50

即使你没有充分利用的bean注入到你的应用程序，创建的beans.xml文件（无需内声明的任何豆）以下内容在“src/main/webapp/WEB-INF /”已经为我解决了这个问题一次：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/beans_1_0.xsd"> 
</beans>

来源

2014-11-09 13:33:52 tmarwen

该文件beans.xml已经存在.Netbeans为我创建了它。谢谢。 – Alex 2014-11-09 19:24:51

Netbeans 8.1和Glassfish Open Source Edition 4.1（版本13）也出现同样的问题。您可以通过创建或./WEB-INF文件夹修改beans.xml文件来禁用CDI：

<?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" 
     bean-discovery-mode="none"> 
</beans>

bean-discovery-mode设置为none。

更多信息here。

来源

2016-03-05 17:31:15

Glassfish 4.1错误：session.invalidate nullpointer异常

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