[jboss-jira] [JBoss JIRA] (WFLY-4347) NullPointerException in WebServerService.getListenerMap

[Mayank Mittal (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-4347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040310#comment-13040310 ] 

Mayank Mittal commented on WFLY-4347:
-------------------------------------

Attached are :
* Sample code
* Server log

I restarted server 5 times, out of which 4 times it was successful and 1 time it failed. The attached logs are from failed instance.

> NullPointerException in WebServerService.getListenerMap
> -------------------------------------------------------
>
>                 Key: WFLY-4347
>                 URL: https://issues.jboss.org/browse/WFLY-4347
>             Project: WildFly
>          Issue Type: Bug
>          Components: Web Services
>    Affects Versions: 8.1.0.Final
>         Environment: Windows, Linux 
> Java 8
>            Reporter: Mayank Mittal
>            Assignee: Tomaz Cerar
>         Attachments: server.log, test.zip
>
>
> While deploying a SLSB annotated with WebService causes NullPointerException in WebServerService.getListenerMap
> {noformat}
> org.jboss.msc.service.StartException in service jboss.deployment.subunit."myTest.ear"."myTest.jar".INSTALL: JBAS018733: Failed to process phase INSTALL of subdeployment "myTest.jar" of deployment "myTest.ear"
> at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166)
> at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
> at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.NullPointerException
> at java.util.LinkedList$ListItr.next(Unknown Source)
> at org.wildfly.extension.undertow.WebServerService.getListenerMap(WebServerService.java:73)
> at org.wildfly.extension.undertow.WebServerService.getPort(WebServerService.java:49)
> at org.jboss.as.webservices.config.WebServerInfoImpl.getPort(WebServerInfoImpl.java:36)
> at org.jboss.ws.common.management.AbstractServerConfig.getConnectorPort(AbstractServerConfig.java:207)
> at org.jboss.ws.common.management.AbstractServerConfig.getWebServicePort(AbstractServerConfig.java:170)
> at org.jboss.ws.common.deployment.EndpointAddressDeploymentAspect$PortValue.getPortValue(EndpointAddressDeploymentAspect.java:198)
> at org.jboss.ws.common.deployment.EndpointAddressDeploymentAspect$PortValue.getValue(EndpointAddressDeploymentAspect.java:191)
> at org.jboss.ws.common.deployment.EndpointAddressDeploymentAspect.start(EndpointAddressDeploymentAspect.java:77)
> at org.jboss.as.webservices.deployers.AspectDeploymentProcessor.deploy(AspectDeploymentProcessor.java:75)
> at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159)
> {noformat}
> Upon looking into the source code, I found that the the collection used to hold registered listeners in org.wildfly.extension.undertow.Server class is LinkedList. 
> What I understand from the code is that this list is getting accessed by two threads at some moment of time and causes the NullPointerException
> plz. refer http://stackoverflow.com/questions/18055024/nullpointer-exception-in-linkedlist-while-using-for-each-loop.
> I think one should use ConcurrentHashSet to avoid such situations.



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