Github user kkolinko commented on the issue: https://github.com/apache/tomcat/pull/122 The javadoc that you linked https://docs.oracle.com/javaee/7/api/javax/servlet/SessionCookieConfig.html says "Returns: [...] or null if setName(java.lang.String) was never called" Thus it documents null as the default value. BTW, the cookie name can be overwritten by sessionCookieName attribute on Context, http://tomcat.apache.org/tomcat-9.0-doc/config/context.html#Common_Attributes
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