Memory leak in FlashScope - expired elements are not cleared ------------------------------------------------------------ Key: WFLY-12643 URL: https://issues.jboss.org/browse/WFLY-12643 Project: WildFly Issue Type: Bug Components: JSF Environment: * JBoss EAP 7.2.3 (also JBoss EAP 7.1.6 that is the latest version in 7.1.x is affected by this issue) Reporter: Bartosz Spyrko Assignee: Bartosz Spyrko Priority: Critical Objects in FlashScope is not cleared and keep accumulating even if POST-REDIRECT-BACK is completed. If we put a huge object to FlashScope continuously as the following code, Java heap space will be exhausted soon. {code:java} @Model public class Action { private static final int oneHundredMB = 1024 * 1024 * 100; public String next() { Flash flash = FacesContext.getCurrentInstance().getExternalContext().getFlash(); flash.putNow("huge", new byte[oneHundredMB]); return "index.xhtml?faces-redirect=true"; } } {code} When OutOfMemoryError is happened, flashInnerMap field in com.sun.faces.context.flash.ELFlash is bloated. {noformat} Class Name | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap ----------------------------------------------------------------------------------------------------------------------------------------- java.lang.Thread @ 0xeea24380 default task-1 Thread | 1 | 120 | 64 | 20,800 '- <Java Local> com.sun.faces.context.flash.ELFlash @ 0xee9e4608 | 1 | 40 | 64 | 64 '- flashInnerMap java.util.concurrent.ConcurrentHashMap @ 0xee9e4630| 1 | 64 | 64 | 314,574,048 ----------------------------------------------------------------------------------------------------------------------------------------- {noformat}