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https://issues.apache.org/jira/browse/WW-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart resolved WW-5005.
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Resolution: Fixed
> Struts2 convention plugin lacks Java 11 support
> -----------------------------------------------
>
> Key: WW-5005
> URL: https://issues.apache.org/jira/browse/WW-5005
> Project: Struts 2
> Issue Type: New Feature
> Components: Plugin - Convention
> Affects Versions: 2.5.20
> Reporter: Sebastian Götz
> Assignee: Yasser Zamani
> Priority: Major
> Fix For: 2.5.21, 2.6
>
>
> As discussed in the mailing list, the convention plugin is uncapable of
> analysing web applications that have classes compiled with class versions
> higher than 52. This blocks users that compile their web app projects with
> Java 9, 10 or 11.
> Excerpt from the mailing list discussion:
> I have taken a look at the struts-2-5-x branch in github. There is a global
> property in the {{struts-parent}} of that defines the version for ASM:
> {{<asm.version>5.2</asm.version>}}
> The {{struts-master}} pom of the current github *master branch* has:
> {{<asm.version>7.0</asm.version>}}
> But when I look into {{DefaultClassFinder$InfoBuildingVisitor}} class (line
> 461) of the *master branch* there is still ASM 5 used:
> {{public class InfoBuildingVisitor extends ClassVisitor {}}
> {{ private Info info;}}
> {{ private ClassFinder classFinder;}}
> {{ public InfoBuildingVisitor(ClassFinder classFinder) {}}
> *{{super(Opcodes.ASM5);}}*
> {{ this.classFinder = classFinder;}}
> \{{ }}}
> So first step would be to change this coupling to ASM's version 7 API and
> check how this affects classes compiled with Java 8 or below.
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