[jira] [Work started] (WW-5622) Optimize Hibernate proxy detection to avoid repeated exception overhead when Hibernate is absent

["Lukasz Lenart (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WW-5622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on WW-5622 started by Lukasz Lenart.
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> Optimize Hibernate proxy detection to avoid repeated exception overhead when Hibernate is absent
> ------------------------------------------------------------------------------------------------
>
>                 Key: WW-5622
>                 URL: https://issues.apache.org/jira/browse/WW-5622
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Lukasz Lenart
>            Assignee: Lukasz Lenart
>            Priority: Major
>             Fix For: 6.9.0, 7.2.0
>
>
> When Hibernate is not on the application classpath, Hibernate proxy detection methods throw and internally catch exceptions (NoClassDefFoundError in 6.x, LinkageError in 7.x) on every invocation. Applications with many distinct classes flowing through OGNL experience hundreds of thousands of caught exceptions, causing measurable performance degradation.
> h3. Impact
> The impact is most severe in Struts 6.x where {{com.opensymphony.xwork2.util.ProxyUtil}} lacks effective caching - {{isHibernateProxy()}} throws on nearly every call. Struts 7.x mitigates this partially via {{computeIfAbsent}} caching in {{StrutsProxyService}}, but still throws once per unique class/member.
> h3. Fix
> Detect Hibernate availability once at class-load time via {{Class.forName()}} and short-circuit all Hibernate-related methods immediately when absent. The existing {{try/catch}} blocks are retained as a safety net for partial classpath scenarios.
> h3. Affected Classes
> - 6.x: {{com.opensymphony.xwork2.util.ProxyUtil}}
> - 7.x: {{org.apache.struts2.util.StrutsProxyService}} and deprecated {{org.apache.struts2.util.ProxyUtil}}
> h3. Affected Methods
> - {{isHibernateProxy()}}                                  
> - {{isHibernateProxyMember()}}
> - {{getHibernateProxyTarget()}}



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