The App Engine only provides the content for your app using Jetty <https://cloud.google.com/appengine/docs/standard/java/runtime-java8>. Session gets created when you call request.getSession() for the first time and consequently JSESSIONID cookie <https://www.eclipse.org/jetty/documentation/9.3.x/session-management.html> is created when the session is created. Hope this explanation works for you?
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