You are right, I had to upgrade the code to make it work. I am still curious
why this exception occurs in glassfish log everytime I run the project
SEVERE: WebModule[/whiteboard]Exception sending context destroyed event to
listener instance of class
org.glassfish.tyrus.oldservlet.WebSocketServerWebIntegration
java.lang.NullPointerException at
org.glassfish.tyrus.oldservlet.WebSocketServerWebIntegration.contextDestroyed(WebSocketServerWebIntegration.java:186)
at
org.apache.catalina.core.StandardContext.contextListenerStop(StandardContext.java:5405)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:6069)
at com.sun.enterprise.web.WebModule.stop(WebModule.java:725) at
org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:1172)
at
com.sun.enterprise.web.WebContainer.unloadWebModule(WebContainer.java:2457)
at
com.sun.enterprise.web.WebContainer.unloadWebModule(WebContainer.java:2412)
at com.sun.enterprise.web.WebApplication.stop(WebApplication.java:191) at
org.glassfish.internal.data.EngineRef.stop(EngineRef.java:161) at
org.glassfish.internal.data.ModuleInfo.stop(ModuleInfo.java:306) at
org.glassfish.internal.data.ApplicationInfo.stop(ApplicationInfo.java:324) at
com.sun.enterprise.v3.server.ApplicationLifecycle.unload(ApplicationLifecycle.java:1056)
at
com.sun.enterprise.v3.server.ApplicationLifecycle.undeploy(ApplicationLifecycle.java:1096)
at
org.glassfish.deployment.admin.UndeployCommand.execute(UndeployCommand.java:400)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:529)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:525)
at java.security.AccessController.doPrivileged(Native Method) at
javax.security.auth.Subject.doAs(Subject.java:357) at
com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:524)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:548)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1425)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1400(CommandRunnerImpl.java:109)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1746)
at
com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1676)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
at
com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
at
org.glassfish.grizzly.http.server.StaticHttpHandler.service(StaticHttpHandler.java:297)
at
com.sun.enterprise.v3.server.HK2Dispatcher.dispatch(HK2Dispatcher.java:113)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:236)
at
org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:164)
at
org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:175)
at
org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:273)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at
org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:134)
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:818)
at
org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at
org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at
org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:562)
at
org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:542)
at java.lang.Thread.run(Thread.java:722)
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