• JBoss instance accepts no more new requests.
  • Processing in-flight request becomes very slow or timed out.


Wrong design or implementation of customer's application / third party library or framework

  • Infinite loop
  • Too long SQL / WS out-band calls
  • Thread deadlock

Wrong estimation of thread tuning

  • All available threads are busy and JBoss runs out of resources to execute new request
  • Too long request processing
  • Waiting for response from peer(e.g. RDBMS)
  • Contention of resources
  • Underestimation of peak load
  • Too long JVM Full GC

Java VM or JBoss bug


  • Get the Thread dump
  • Get the GC log