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https://issues.apache.org/jira/browse/TAP5-2134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697326#comment-13697326
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Yunhua Sang commented on TAP5-2134:
-----------------------------------
I added -Dtapestry.session-locking-enabled=false into startup parameters, the
problem was gone. Thanks.
In my opinion, it would be better that the default value of this parameter is
false, as suggested by this issue's title.
> Session locking (introduced in 5.4) should be optional
> ------------------------------------------------------
>
> Key: TAP5-2134
> URL: https://issues.apache.org/jira/browse/TAP5-2134
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.4
> Reporter: Yunhua Sang
> Assignee: Howard M. Lewis Ship
> Labels: thread-safety
> Attachments: TestPage.java, TestPage.tml
>
>
> Tapestry 5.4 introduced session locking, whereby access to the HttpSession is
> serialized when multiple threads are active for the same session (this can
> occur in some Ajax scenarios). This has been highly controversial, and (at
> the very least), it should be optional, controlled by a configuration symbol.
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