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    <title>Magnolia - Issue tracker</title>
    <link>https://jira.magnolia-cms.com</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-uk</language>    <build-info>
        <version>9.4.2</version>
        <build-number>940002</build-number>
        <build-date>19-01-2023</build-date>
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<item>
            <title>[DOCU-2908] 4Known issues: Concurrency issues in JS Models</title>
                <link>https://jira.magnolia-cms.com/browse/DOCU-2908</link>
                <project id="10190" key="DOCU">Documentation</project>
                    <description>&lt;p&gt;From Scot&lt;/p&gt;

&lt;p&gt;Hey everyone. I had a call with DHL concerning the JS Models 2. They ran into concurrency issues using it, where the render cycle will unreliably fail but still result in 200 responses. Sadly, this has only come up in their staging systems. The issue comes from the fact that when the GraalVM Context is accessed concurrently, it will sometimes try to access that context from a different thread, which is an illegal access. Would be good to take a look at some solutions to make sure this doesn&apos;t happen. Fortunately, it&apos;s not a blocker for them as they are just using Freemarker scripts while they wait for a more stable JS Models module.&lt;br/&gt;
The fine folks at GraalVM have addressed this sort of issue with some test examples:&#160;&lt;a href=&quot;https://www.graalvm.org/latest/reference-manual/js/Multithreading/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.graalvm.org/latest/reference-manual/js/Multithreading/&lt;/a&gt;&lt;br/&gt;
I also, while trying to reproduce this, played with upgrading the GraalVM dependencies to the latest 23.0.2. It seems to work, but I did have to modify the jdk11 profile a little:&lt;br/&gt;
          &amp;lt;plugin&amp;gt;&lt;br/&gt;
            &amp;lt;artifactId&amp;gt;maven-surefire-plugin&amp;lt;/artifactId&amp;gt;&lt;br/&gt;
            &amp;lt;version&amp;gt;2.22.1&amp;lt;/version&amp;gt;&lt;br/&gt;
            &amp;lt;configuration&amp;gt;&lt;br/&gt;
              &amp;lt;argLine&amp;gt;-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI --module-path=${compiler.dir} --upgrade-module-path=${compiler.dir}/compiler.jar --add-exports=jdk.internal.vm.compiler/org.graalvm.compiler.options=ALL-UNNAMED&amp;lt;/argLine&amp;gt;&lt;br/&gt;
            &amp;lt;/configuration&amp;gt;&lt;br/&gt;
          &amp;lt;/plugin&amp;gt;&lt;br/&gt;
(added&#160;&lt;tt&gt;--add-exports=jdk.internal.vm.compiler/org.graalvm.compiler.options=ALL-UNNAMED&lt;/tt&gt;). If you are interested in having a discussion about this, let me know.&lt;br/&gt;
&#160;&lt;br/&gt;
------------------&lt;br/&gt;
&#160;&lt;br/&gt;
Adding to 6.2 known issues page:&lt;br/&gt;
&#160;&lt;br/&gt;
&lt;b&gt;Concurrency issues in JS Models&lt;/b&gt;The render cycle unreliably fails but still results in 200 responses. This issue comes from the fact that when the GraalVM Context is accessed concurrently, it will sometimes try to access that context from a different thread, which is an illegal access.&lt;/p&gt;</description>
                <environment></environment>
        <key id="141511">DOCU-2908</key>
            <summary>4Known issues: Concurrency issues in JS Models</summary>
                <type id="3" iconUrl="https://jira.magnolia-cms.com/secure/viewavatar?size=xsmall&amp;avatarId=10898&amp;avatarType=issuetype">Task</type>
                                            <priority id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/priorities/neutral.gif">Neutral</priority>
                        <status id="6" iconUrl="https://jira.magnolia-cms.com/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are not closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="11">Done</resolution>
                                        <assignee username="mdrapela">Martin Dr&#225;pela</assignee>
                                    <reporter username="mdrapela">Martin Dr&#225;pela</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Nov 2023 10:55:22 +0100</created>
                <updated>Fri, 10 Nov 2023 08:32:27 +0100</updated>
                            <resolved>Fri, 10 Nov 2023 08:32:27 +0100</resolved>
                                                                        <due></due>
                            <votes>0</votes>
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