java.lang.NullPointerException: This exception has no message.

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Tomcat NullPointerException when client doesn't complete SSL handshake

This exception has no message.

java.lang.NullPointerException: 	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:221)	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:323)	at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:1675)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)