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Huge memory leak in WildFly

The project shows a huge memory leak introduced in recent WildFly versions that can crash a real-world Java EE application in a matter of hours.

Affected versions: 20.0.0.Beta1, 19.1.0.Final, 18.0.1.Final

Unaffected versions: 17.0.1.Final

Steps to reproduce

  • Build the project
  • Deploy generated WAR file to WildFly
  • Execute the bash script 
    for i in {1..10}; do curl http://localhost:8080/wildfly-oome/; done
  • Requests start failing with java.lang.OutOfMemoryError: Java heap space

Analysis

When a JSF page contains any component bound to page variable, all CDI beans (regardless of scope) used on that page stay in memory. The image below shows memory after GC.

Image of memory after GC