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https://issues.apache.org/jira/browse/CLK-712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888986#action_12888986
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Bob Schellink commented on CLK-712:
-----------------------------------
Form, FieldSet and PickList has similar code which we should cleanup as well.
> ConcurrentModificationException during rendering of Css/JsImport element.
> -------------------------------------------------------------------------
>
> Key: CLK-712
> URL: https://issues.apache.org/jira/browse/CLK-712
> Project: Click
> Issue Type: Bug
> Components: core
> Reporter: Finn Bock
> Priority: Critical
>
> In Css/JsImport.render(), the src/href attribute is temporarily removed:
> // Temporarily remove href attribute while other attributes are
> rendered
> setAttribute("href", null);
> appendAttributes(buffer);
> // Restore href attribute
> setAttribute("href", href);
> This cause incorrect rendering and ConcurrentModificationException when other
> threads rendering the same element. The sharing between threads is common for
> the CSS & JS elements added to a cached menu.
> It is quite easy to reproduce: Just let jmeter hit
> localhost:8080/click-examples/home.htm about 40.000 times. After the test is
> finished use a browser to show the examples homepage. For me, the CSS and JS
> import elements related to menu is missing or rendered incorrectly.
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