We are getting this error, in tomcat 8, this caused tomcat to fail, to
invalidate sessions, there by session are staying in memory till restart,
04-May-2017 15:49:27.688 WARNING
[ContainerBackgroundProcessor[StandardEngine[Catalina]]]
org.apache.catalina.core.StandardContext.backgroundProcess Exception
processing manager org.apache.catalina.session.StandardManager[/myapp]
background process
java.lang.NullPointerException
at
org.apache.catalina.session.StandardSession.fireSessionEvent(StandardSession.java:1791)
at
org.apache.catalina.session.StandardSession.expire(StandardSession.java:867)
at
org.apache.catalina.session.StandardSession.isValid(StandardSession.java:695)
at
org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:666)
at
org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:651)
at
org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:5669)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1376)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1380)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1380)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1348)
at java.lang.Thread.run(Thread.java:745)
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