Degraded performance in EAP 7.1 from ImportedClassELResolver

Environment

• JBoss Enterprise Application Platform (EAP) 7.1

Issue

• We recently upgraded from EAP 7.0 to 7.1 and see degraded performance. It seems EAP 7.1 is hitting extra processing overhead in org.wildlfy.extension.undertow.ImportedClassELResolver.getValue and its underlying javax.el.ImportHandler.resolveClass calls

Resolution

• Apply EAP 7.1 CP5 or later
• As a workaround, downgrade the servlet version in your WEB-INF/web.xml from 3.1 to 3.0 to avoid the use of the ImportedClassELResolver:

<web-app version="3.0">
...

Root Cause

• Content from issues.jboss.org is not included.JBEAP-14605
• EAP 7.1 added the ImportedClassELResolver with Content from issues.jboss.org is not included.WFLY-6939 and caused increased overhead

Diagnostic Steps

• Capture profiler snapshots from 7.1 and 7.0 and compare to see increased time in ImportedClassELResolver

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