Tomcat NioEndpoint$SocketProcessor.doRun java.lang.NullPointerException error

When initiating the Tomcat instance, the cas-stderr log file will log a SEVERE error logging multiple times every few seconds
June 5, 2017
TomcatJava-8PKICAS

The error response would looks something like this, SEVERE https-openssl-nio-443-exec-1 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun Obviously, the java.lang.NullPointerException doesn't help anyone understand the situation or the root cause. The packages highlighted in the stack trace however provides some indication on the root cause.

I believe the situation occurs when Tomcat itself is using the Java packages to when initiating a handshake. Because of this, it would be indicative that this has to be because of the java keystore that is instantiated during the startup. Because I am using Java 8, there is a new NIO package (it's actually available for Java 7 onwards)

https://technicalconfessions.com/images/postimages/postimages/_442_4_Tomcat NIO2 Configuration Before.png

Turns out that I needed the include the 'protocol="org.apache.coyote.http11.Http11Nio2Protocol' within the connector node, located within the server.xml file. Examples are shown within the images.

https://technicalconfessions.com/images/postimages/postimages/_442_5_Tomcat NIO2 Configuration AFTER.png

Once I included the Http11Nio2Protocol declaration, I bounced the Tomcat instance and the error was no longer presented. The web applications were also operating as expected

About the author

Daniel is a Technical Manager with over 10 years of consulting expertise in the Identity and Access Management space.
Daniel has built from scratch this blog as well as technicalconfessions.com
Follow Daniel on twitter @nervouswiggles

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