JBoss - Java heap retention in io.undertow.servlet.util.SavedRequest

Environment

• JBoss Enterprise Application Platform (EAP)
  • 7.x
  • 8.x

Issue

• We reach an OutOfMemoryError with excessive overhead shown in io.undertow.servlet.util.SavedRequest objects and its allocated buffer with mostly empty space.

Resolution

• Decrease the max-buffered-request-size setting of your Undertow listeners.

Root Cause

• io.undertow.servlet.util.SavedRequest eagerly allocates its buffer to the full configured amount, allowing for unneeded excessive overhead with large configured max-buffered-request-sizes
• This content is not included.UNDERTOW-2289
• This content is not included.JBEAP-31470

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