https://bz.apache.org/bugzilla/show_bug.cgi?id=65525

            Bug ID: 65525
           Summary: Exception in thread "http-nio-8080-ClientPoller"
                    java.lang.NullPointerException
           Product: Tomcat 9
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: WebSocket
          Assignee: dev@tomcat.apache.org
          Reporter: juhigupta...@gmail.com
  Target Milestone: -----

I have a JAVA application running on spring boot 2.3.2 following is the
defination defined in pom


<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.3.2.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
</parent>

from the following link
https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-tomcat/2.3.2.RELEASE
I can see it uses 9.0.x Tomcat


I have started to notice that the application has started to throw following 
exception:

Exception in thread "http-nio-8080-ClientPoller" java.lang.NullPointerException
        at
org.apache.tomcat.util.net.NioEndpoint$Poller.events(NioEndpoint.java:613)
        at
org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:729)
        at java.base/java.lang.Thread.run(Thread.java:832)


and after this exception all the rest calls get stuck and breaks the
application.
Not sure what is causing it and how to mitigate it. 

Getting this error in prod and not sure how to resolve it, any hep is
appreciated.

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