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a presentation from 2001
J2EE Servlet Sessions
_ javax.servlet.http.HttpSession
_ A way to identify a user across more than one page request or visit to a Web site and to store information about that user.
_ Application servers implement high availability features• Replication, failover
J2EE Servlet Sessions API
_ Attributes• set/getAttribute
_ Listeners• Adding/removing attributes• Creation/Expiry of sessions• Failover of sessions
_ Propagated via cookie (JSESSIONID) or via URL or via FORM parameters
jsessionattribute value
attribute value
attribute value
Set-Cookie:
JSESSIONID=eVMwvIslqWWdilsxbs!738403096!-1321526768;
path=/; secure; HttpOnly
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New Gen Old Gen Meta
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Since beginning of sessions - slow
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key{sharding_part}
twemproxy
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key{sharding_part}
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• Filter
• HttpServletRequestWrapper.getSession()
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Web App
Filter
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expiresession1 instantsession2 instantsession3 instant
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expiresession1 instantsession2 instantsession3 instant
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DEPENDENCIES!
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Session Filter
Web App
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Filter
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Agent
Container
Web App
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java -javagent:$SESSION_PATH/session-agent.jar \-jar ../start.jar \--lib=$SESSION_PATH/session-replacement-shaded.jar
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