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  1. WildFly
  2. WFLY-12643

Memory leak in FlashScope - expired elements are not cleared

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    • Resolution: Done
    • Icon: Critical Critical
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    • JSF
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      1. Deploy the attached reproducer.
      2. Press "Accumulate 100MB in FlashScope" button several times, then, OOMError will occur.

      Show
      1. Deploy the attached reproducer. 2. Press "Accumulate 100MB in FlashScope" button several times, then, OOMError will occur.
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      • Using SessionScope instead of FlashScope for POST-REDIRECT-GET.
      • Set com.sun.faces.numberOfConcerrentFlashUsers and com.sun.faces.numberOfFlashesBetweenFlashReapings to web.xml as following 
        <context-param>
    <param-name>com.sun.faces.numberOfConcerrentFlashUsers</param-name>
    <param-value>10</param-value>
</context-param>
<context-param>
    <param-name>com.sun.faces.numberOfFlashesBetweenFlashReapings</param-name>
    <param-value>1</param-value>
</context-param>
      Show
      Using SessionScope instead of FlashScope for POST-REDIRECT-GET. Set com.sun.faces.numberOfConcerrentFlashUsers and com.sun.faces.numberOfFlashesBetweenFlashReapings to web.xml as following <context-param> <param-name> com.sun.faces.numberOfConcerrentFlashUsers </param-name> <param-value> 10 </param-value> </context-param> <context-param> <param-name> com.sun.faces.numberOfFlashesBetweenFlashReapings </param-name> <param-value> 1 </param-value> </context-param>

      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.

      @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";
    }
}

      When OutOfMemoryError is happened, flashInnerMap field in com.sun.faces.context.flash.ELFlash is bloated.

      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
-----------------------------------------------------------------------------------------------------------------------------------------

            spyrkob Bartosz Spyrko-Smietanko
            spyrkob Bartosz Spyrko-Smietanko
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              Created:
              Updated:
              Resolved: